JP2008072791A - Device, method and program for determining installation position of measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for determining the installation position of a measuring instrument where the number of measuring instruments is reduced and calculation errors are minimized, in an electric power system. <P>SOLUTION: The device for determining the installation position of a measuring instrument comprises a system data registration/recording means 11 for setting/registering the constitution of a power system, demand data and calculation conditions, a calculation data creating means 12 for creating the calculation data to be used for calculating the conditions for the power system from the registered data; an object power system voltage/tidal current distribution state determining means 13 for obtaining the plurality of voltages/tidal current distribution conditions of the power system to be calculated, for calculating the electric power amount at an installation position candidate of the measurement instrument; and a calculation data restoring means 14 for restoring the calculating data and calculated results. A means 15 for determining the installation position of the measuring instrument provisionally sets the position of the plurality of measuring instruments to be set in the system and calculates the system conditions, from the data obtained by the object power system voltage/tidal current distribution state determining means 13, to select the installation position of the plurality of measuring instruments. A calculation result outputting means 16 outputs the calculating data and the calculated results. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention determines the installation position of a measuring instrument used to determine the installation location of a measuring instrument necessary for grasping the voltage distribution and power flow state of the distribution line in voltage management and operation control of the distribution line in the distribution system. The present invention relates to a device, a determination method, and a program for realizing these on a computer.

  In general, the distribution system in Japan is configured radially from the main system through the distribution substation, and basically there is only a load on the distribution line. And the voltage drop of the distribution line is calculated from the current and the method of maintaining the voltage at the consumer end within the specified value by adjusting the sending voltage is used.

  In recent years, however, distributed power sources using natural energy, such as wind power generation and solar power generation, have been attracting attention as a means of securing alternative energy for oil and global environmental problems. Similarly, the amount of distributed power sources is rapidly increasing.

  On the other hand, the deregulation of electric power has progressed, and coupled with the growing awareness of energy cost reduction by consumers, the introduction of private power generation facilities and the like has progressed, and power generation facilities for sale that allow reverse power flow to the distribution system are connected. Being started. Due to the interconnection of these distributed power sources, there is a concern that conventional voltage management cannot cope with it, and the importance of accurately grasping the state of the distribution system is increasing.

  As means for accurately grasping the state of the distribution system, switches with measuring instruments are being installed in some of the distribution systems of each power company. Using the information (voltage, current, power factor, etc.) measured by these switches with measuring instruments, in order to grasp the voltage / tidal current distribution of distribution lines more accurately than the current situation, Studies on tidal current calculation methods are being conducted (see, for example, Patent Documents 1 to 4 and Non-Patent Documents 1 to 4).

JP 2000-244504 JP 2001-78358 A JP 2002-51464 A JP 2004-88963 A

Mori and Iwata: “State estimation for radial power distribution systems”, 1998 Annual Meeting of the Institute of Electrical Engineers of Japan, No. 178, (1998) Naka, Fujine, Motoharu, Yura, Fukuyama, and Takayama: “Examination of distribution system state estimation method considering characteristics of real system equipment”, IEEJ Transactions B, Vol. 120-B, no. 12, pp. 1566 (2000) Watanabe, Komura, Uchiyama: “Examination of distribution system state estimation method based on limited observation information”, 2004 IEEJ Power Technology / Power System Technology Study Material, PE-04-91, PSE-04-91 ( 2004) Tanomura, Iwata, Kaneshige, Ishii, Arai: “Calculation of voltage and current distribution in distribution system using measurement information”, IEEJ Transactions B, Vol. 125-B, no. 10, pp. 948 (2005)

  Generally, distribution lines are radially formed from distribution substations and have a wide area. Therefore, it is not realistic from the economical viewpoint to install measuring instruments on all switches and utility poles. Therefore, it must be installed with a limited number of measuring instruments so as to obtain the intended effect.

  At present, the number of installations and installation locations per distribution line are determined based on past experience, such as from a branch point or an automatic voltage regulator (SVR) on the load side or an important point for voltage management. For this reason, from the viewpoint of calculation accuracy, there may occur a situation in which more measuring instruments are installed than necessary or, conversely, fewer measuring instruments are installed.

  Thus, it is not economical that there are more measuring instruments installed than necessary, and conversely, if the number of measuring instruments installed is small, sufficient calculation accuracy cannot be obtained, and voltage management of the distribution line is not possible. You will not be able to do it properly. From a practical point of view, it is desirable to obtain the best effect with a minimum number of measuring instruments.

  Therefore, the inventions of Patent Documents 1-5 and Non-Patent Documents 1-4 are provided as methods for installing measuring instruments at important points of the distribution lines and trying to estimate the voltages of the distribution lines using the limited measurement information. Proposed. However, these are methods in a state where the measuring instrument installation location of the distribution line is determined in advance, and the installation location of the measuring instrument is not necessarily in an optimal state. For example, even if the required calculation accuracy is obtained with a distribution line in which six measuring instruments are installed, the optimum number may be four, and if the distribution line system configuration is changed, Since the apparent installation position changes, the necessary calculation accuracy may not be ensured.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is to grasp the voltage distribution and power flow state of the distribution line in the voltage management and operation control of the distribution line. It is to provide a measuring instrument installation position determination device, a method and a program thereof that can determine the installation positions of measuring instruments necessary for the measurement so that the best effect (accuracy of distribution line state calculation, etc.) can be obtained with a minimum number. .

  In order to achieve the above object, the measuring instrument installation position determining device of the present invention is registered with the configuration and demand data of the power system, and system data registration / recording means for setting / registering calculation conditions. Calculation data creation means for creating calculation data to be used to calculate the state of the power system from the collected data, and obtain multiple voltage / tidal current distribution states of the power system to be calculated, The target power system voltage / tidal current distribution state determination means for calculating the amount of electricity of the power, the calculation data storage means for storing calculation data and calculation results, and the positions of a plurality of measuring instruments installed in the system are temporarily It consists of measuring device installation position determining means that calculates the system status by setting and selecting the installation position of multiple measuring instruments, and calculation result output means that outputs calculation data and calculation results according to the user's specification. The And wherein the Rukoto.

  In addition, a method for determining a measuring instrument installation position using the apparatus as described above and a program for realizing the apparatus and method on a computer are also one aspect of the present invention.

  According to the present invention, when calculating the voltage and power flow distribution of the distribution system using the measurement value of the measuring instrument, the combination of the installation positions of the measuring instrument is based on the detailed power flow calculation results for a plurality of supply and demand sections. , Measuring device installation position determination device that can determine the installation position of the measuring instrument with a small number of measuring instruments and minimize the calculation error by searching for the evaluation value to be small and show the result to the user It is possible to provide a program that implements these devices and methods on a computer.

  Hereinafter, an embodiment of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the present embodiment, and FIGS. 2 to 7 are block diagrams showing the specific configuration of each means shown in the overall configuration diagram of FIG.

(1) Configuration of the embodiment
(a) Overall Configuration As shown in FIG. 1, a measuring instrument installation position determining device 10 of this embodiment includes a system data registration / recording unit 11, a calculation data creating unit 12, a target power system voltage / tidal current distribution state determining unit. 13, calculation data storage means 14, measuring instrument installation position determination means 15, and calculation result output means 16.

(b) System data registration / recording means 11...
The grid data registration / recording means 11 includes a power grid data setting / changing means 111, a calculation condition designating / changing means 112, first and second data confirmation / registration means 113, 114, a power grid database 115, a calculation condition database 116. , Data output format setting means 117 and data output means 118.

  The power system data setting / changing means 111, the calculation condition designation / changing means 112, and the data output format setting means 117 are for accepting input of data and commands from the user, and are input devices such as a computer keyboard, touch panel, and mouse. And an interface for transmitting and receiving data from other computers and storage means.

  The power system data setting / changing unit 111 receives an instruction from the user to newly set, change, or delete the facility data and supply / demand data of the target power system, and sends the data to the first data check registration unit 113. . Here, the facility data and supply / demand data of the power system are data such as distribution lines and switches, distribution poles, distribution line connection information, voltage regulators, and connection load information of the distribution system. It is the supply-demand cross-section number S and supply-demand cross-section data for every distribution line.

  The data confirmation registration unit 113 individually checks whether the received data is within a preset valid data range, and if not, outputs a message to that effect to the data output unit 118. If the data is within the valid range, the data is recorded in the power system database (power system DB) 115.

  The calculation condition designating / changing means 112 is necessary to determine the installation position of the measuring instrument in the target power system, the maximum number of measuring instruments, the installation availability condition of the measuring instrument installation candidate position, the installation priority condition, the installation interval condition, Instructions such as valid / invalid designation of an evaluation reference value for determining the end of calculation, change of designated value, cancellation of designation, etc. are received and sent to the second data confirmation registration means 114.

  The data confirmation registration unit 114 checks whether there are any deficiencies in the valid / invalid / cancellation specification of the received condition designation value or condition, and whether there is a contradictory condition designation. If there is a problem, A message is sent to the data output means 118 informing the user to re-specify the condition. If there is no problem with the condition designation or the designated value, the designated condition is recorded in the calculation condition database (calculation condition DB) 116.

  The data output format setting means 117 takes out data designated by the user from the power system DB 115 and the calculation condition DB 116, selects an output format designated by the user from preset output formats, and outputs the output format. Then, the data is processed and sent to the data output means 118. The data output means 118 outputs the received data to an output device such as a printer or a display. An instruction from the user to the data output format setting unit 117 is input from an input device such as a keyboard constituting the power system data setting / changing unit 111 or the calculation condition designating / changing unit 112.

(c) Calculation data storage means 14 FIG. 5
The calculation data storage means 14 includes a tidal current calculation data storage means 141, a detailed tidal current calculation result storage means 142, a measuring instrument installation candidate position electric quantity storage means 143, a measuring instrument utilization tidal current calculation result storage means 144, and an evaluation value storage means. 145 and measuring instrument installation executable solution storage means 146. As these storage means, a storage device such as a hard disk, a memory, a CD, or an optical disk constituting computer hardware is used.

(d) Calculation data creation means 12 ... FIG.
The calculation data creation means 12 comprises a calculation execution command reception means 121 constituted by an input means such as a keyboard, a data creation means 122 constituted by a calculation processing unit of a computer, and a calculation condition setting means 123. .

  The calculation execution command receiving unit 121 receives the transmitted calculation execution command and sends a calculation start signal to the data creation unit 122 in accordance with an operation such as a user pressing a calculation execution button set on a keyboard or the like.

  The data creation means 122 includes facility data and power supply / demand data of the target power system designated by the user from the power system DB 115 (specifically, distribution lines and switches of the distribution system, utility poles, connection information of distribution lines, voltage Captures equipment data such as regulating equipment, connection load information, and the number of supply and demand cross sections S and supply and demand cross section data for each distribution line, and creates power flow calculation data used to calculate the distribution of voltage and power flow in the distribution system To do. In addition, the data creation unit 122 sends the created tidal current calculation data to the tidal current calculation data storage unit 141, and sends an end signal of these processes to the calculation condition setting unit 123.

  The calculation condition setting means 123 takes out the calculation conditions from the calculation condition DB 116, processes them into condition data necessary for the tidal current calculation, and sends them to the tidal current calculation data storage means 141. That is, the calculation condition setting means 123 captures the maximum number of measuring instruments input by the user, the installation availability condition of the measuring instrument installation candidate position, the installation priority condition, the installation interval condition, and the evaluation reference value for determining the end of the calculation. This is a means for setting values to flags and variables used in the calculation process.

  Further, the calculation condition setting means 123 sends an end signal of these processes to the power flow calculation data selection means 131 provided in the target power system voltage / power flow distribution state determination means 13. As a result, the power flow calculation data storage unit 141 records the power flow calculation data and the calculation condition data of the target power system.

  Here, the power flow calculation data created by the data creation means 122 is as follows. That is, FIG. 8 is a connection diagram showing an example of the arrangement of each device in the transmission / distribution system to which the present invention is applied, and a schematic diagram showing a process for creating power flow calculation data from the configuration of the transmission / distribution system. is there. In FIG. 8, the power transmission / distribution system includes a system power supply 1, a main system bus 1a, a distribution transformer 6b, a high-voltage distribution bus 1c, and a high-voltage distribution system 2 branched from each bus. The high-voltage distribution system 2 includes a circuit breaker 2a, a switch 2b, a switch 2c with a measuring instrument, a utility pole 2d, a span distribution line 2e, and a branch point 2f, and is also connected to the distributed power source 3.

  In the data creation means 122, a distribution system model in which each device such as the circuit breaker 2a and the branching point 2f constituting the high-voltage distribution system 2 is a “node”, and the distribution line 2e connecting them is a “branch”. The power flow calculation data for the high-voltage distribution system 2 is created. That is, the configuration of the power flow calculation data 4 includes a scratch node 4a corresponding to the high-voltage distribution bus 1c, a node 4b corresponding to the switch 2b, etc., a measuring instrument corresponding node 4c corresponding to the measuring switch 2c, and a distribution line 2e. And a distributed power supply node 5 corresponding to the distributed power supply 3.

(e) Target power system voltage / tidal current distribution state determining means 13 ... FIG.
The target power system voltage / tidal current distribution state determining unit 13 includes a tidal current calculation data selecting unit 131, a detailed tidal current calculating unit 132, and a measuring instrument installation candidate position electricity quantity extracting unit 133.

  The tidal current calculation data selection means 131 receives the tidal current calculation data (created by the data creation means 122) and the calculation condition data (set by the condition setting means 123) of the target system from the tidal current calculation data storage means 141. The supply and demand sections 1 to S are sequentially taken out and sent to the detailed power flow calculation means 132.

The detailed power flow calculation unit 132 executes power flow calculation of the target system, and calculates the node voltage, branch power (active power, reactive power), power transmission loss, and the like of the target system. That is, the detailed power flow calculation means 132 calculates the voltage / power flow distribution state for one supply-demand section j using the power flow calculation data as shown in FIG. 8 created by the data setting means 1. The calculation of the voltage / tidal current distribution state with respect to the supply / demand section is performed for each of the supply / demand sections 1 to S.
The tidal current calculation result thus obtained is sent to the detailed tidal current calculation result storage means 142, and the detailed tidal current calculation result storage means 142 records the result data calculated by the detailed tidal current calculation.

  The measuring instrument installation candidate position electricity quantity calculation means 133 receives the detailed tidal current calculation result data from the detailed tidal current calculation result storage means 142 and calculates various electric quantities at the measuring instrument installation candidate positions. The calculation of these various amounts of electricity is also sequentially performed for each of the supply and demand sections 1 to S, similarly to the detailed power flow calculation.

That is, the measuring instrument installation candidate position electricity quantity calculating means 133 receives the detailed tidal current calculation result data from the detailed tidal current calculation result storage means 142, and at the node where the measuring instrument set in the calculation condition data can be installed, FIG. As shown, the voltage Vm of the measuring instrument, the current Im passing therethrough, and the power factor PFm are calculated by the following equations from the relationship between the node voltage, the node load, and the branch flow connected to the node.

  All the calculated instrument voltages Vm, passing current Im and power factor PFm are sent to the instrument installation candidate position electricity quantity storage means 143 and recorded. In addition, the measuring instrument installation position candidate position electric quantity extraction means 133 sends a processing completion signal to the tidal current calculation data selection means 151 of the measuring instrument installation position determination means 15.

(f) Measuring instrument installation position determining means 15 ... FIG.
The measuring instrument installation position determining means 15 includes a tidal current calculation data selecting means 151, a measuring instrument installation position solution candidate determining means 152, a measured value using tidal current calculating means 153, a tidal current calculation result evaluating means 154, and a measuring instrument installation executable solution selection. Consists of means 155.

  The tidal current calculation data selection means 151 takes out the tidal current calculation data and calculation condition data of the target system created by the data creation means 122 from the tidal current calculation data storage means 141, and measures the instrument installation position solution candidate determination means 152. Send to.

  The instrument installation position solution candidate determination means 152 excludes some instrument installation positions based on the current instrument installation positions acquired from the power system DB, selects new instrument installation positions, and selects a plurality of instrument installation positions. Make a combined solution of the instrument installation position. These are called instrument installation position solution candidates. That is, the measuring instrument installation position solution candidate determining unit 152 moves the installation positions of some measuring instruments based on a predetermined rule based on the measuring instrument installation position combination h selected at the current stage. And a new instrument installation position combination h ′. As a result of this process, solution candidates for measuring instrument installation position combinations are determined by the number of 1 to k.

  In the determination, a combination that satisfies the constraint conditions such as the maximum number of measuring instruments, the installation availability condition, and the installation interval condition is selected according to the calculation condition data set by the calculation condition setting means 12. For example, regarding the installation availability condition, the calculation condition setting means 2 sets in advance the conditions of “installable”, “installation required”, and “installation impossible” for a plurality of candidates for the installation position of the measuring instrument, and the measurement is performed. The device installation position solution candidate determination unit 152 determines an installation position combination solution candidate by combining only the installation positions “installable”.

  In addition, when there is a measuring instrument installation position where installation or installation is indispensable, the measuring instrument installation position cannot be excluded. Therefore, a combined solution is created by excluding other measuring instrument installation positions. Further, when the interval condition of the measuring instrument installation position is determined by the distance, the number of switches, etc., the measuring instrument installation position is excluded or selected so as to satisfy the condition.

  The rule of exclusion and selection of the instrument installation position is, for example, randomly using random numbers, or dividing the target system from the viewpoint of system configuration, determining the number of installations within the category, and changing at regular intervals, Etc. are used. Although the rules for exclusion and selection can be determined arbitrarily, several trials and errors are required to obtain an appropriate solution most efficiently.

  The measuring instrument installation position solution candidate determination means 152 sets one of the solution candidates for the combination generated as described above as the initial installation position. For example, 1/2 of the maximum number of installed measuring instruments set by the calculation condition designating / changing means 112 minus the number of required installed measuring instruments that are always installed is used as the distribution system model data node as the installation position of the measuring instrument. Initialize as. When the maximum number of installed measuring instruments is 5 and the number of essential installed measuring instruments is 1, the initial number of measuring instruments is (5-1) / 2 = 2. The initial installation position of the measuring instrument is randomly determined for the installation positions that satisfy the installation interval condition from the installation positions of the essential installation measuring instrument and the installation position candidates excluding the positions where the installation is impossible. In addition to the above, the method for determining the initial installation position may be determined according to conditions such as the power supply side and load side position of the voltage adjusting device and the load side position of the branch point.

  The instrument installation position solution candidate data determined by the instrument installation position solution candidate determination means 152 is sent to the measured value utilization power flow calculation means 153.

  The measured value utilization power flow calculation means 153 selects one combination solution of the measurement device installation positions according to the measurement device installation position solution candidate data, and calculates the electric quantity measured at those measurement device installation positions. Each of them is taken out from the quantity storage means 143, and the tidal current calculation using the quantity of electricity (for example, the voltage Vm of the measuring instrument, the passing current Im and the power factor PFm) is executed. For example, the calculation method described in Patent Document 5 and Non-Patent Document 4 is used in the measurement value-based power flow calculation.

  That is, it is assumed that there is a measuring instrument at the initial installation position determined by the measuring instrument installation position solution candidate determining means 152 and the amount of electricity is measured, and the detailed power flow calculating means 132 calculates and stores the target distribution system data. From the detailed power flow calculation results, the voltage, voltage phase, current, current phase, and power factor of the node corresponding to the initial installation position of the measuring instrument are taken out, and using these information, the supply-demand section j (of the supply-demand section 1 to S). Calculate the voltage / tidal current distribution of all target distribution systems.

  Similarly, the measured value utilization power flow calculation means 153 calculates the node voltage, branch power flow (active power, reactive power), transmission loss, etc. as the voltage / power flow distribution state of the target system for the combined solution other than the initial installation position. These data are sent to and recorded in the measured value utilization power flow calculation result storage means 144. When all the tidal current calculation using the measured values of the target system and the supply and demand section are completed, a calculation completion signal is sent to the tidal current calculation result evaluation means 154.

The tidal current calculation result evaluation means 154 includes the detailed tidal current calculation result data of the target distribution system data recorded in the detailed tidal current calculation result storage means 142 and the measured value utilization tidal current recorded in the measured value utilization tidal current calculation result recording means 144. From the calculation result data, the error of the voltage of each node, the passing active power and the reactive power is calculated by the following equation. This error calculation is performed for the supply and demand sections 1 to S, and the calculation error in each section is stored.

Moreover, the tidal current calculation result evaluation means 154 calculates the evaluation value E (k) for the set k of the installation positions of the measuring instruments by the following formula using the calculation error calculated in each of the supply and demand sections 1 to S. To do.

  In Equation 3, the first term represents the calculation error, and the second term represents the partial evaluation value of the number of measuring instruments used. The smaller the calculation error, the smaller the first term, and the number of measuring instruments used. The smaller the number, the smaller the second term. Therefore, the total evaluation value E (k) of Equation 3 is the smallest, and the measurement device installation position combination k indicates the most effective measurement device installation position and the number of measurement devices.

  Further, the tidal current calculation result evaluating means 154 executes the error calculation shown in the equation 2 and the evaluation value calculation shown in the equation 3 for all the candidate solutions 1 to k, and the solution candidate 1 The evaluation values of ˜k are calculated.

  The measuring instrument installation feasible solution selection means 155 creates a data list of measuring instrument installation executable solutions based on the evaluation result of the tidal current calculation result evaluation means 154, and evaluates or measures only the comprehensive evaluation value, the calculation error. The evaluation value of the instrument cost is sent to the instrument installation executable solution storage means 146 and recorded. The instrument installation feasible solution selection unit 155 sends a completion signal to the calculation result output unit 16 when all the processes are completed.

  That is, the minimum evaluation value installation position executable solution selection means 155 creates a data list in which the instrument installation position executable solutions obtained up to the present stage are rearranged in the order of the minimum evaluation value, and becomes the minimum evaluation value Emin. This is means for selecting the instrument installation position combination feasible solution as a new instrument installation position combination solution. That is, for each evaluation value of the solution candidates 1 to k, a comparison is made with a preset evaluation value criterion, a solution candidate whose evaluation value exceeds the evaluation value criterion is selected as an executable solution, and the evaluation value is Create data sorted in ascending order.

  Then, extract the minimum evaluation value Emin from the created data list, compare the evaluation value minimum value Emin_S saved in the calculation up to the current stage, and if Emin is smaller than Emin_S, execute the instrument installation The value of Emin_S stored in the possible solution storage means 146 is replaced with the value of Emin. When Emin is larger than Emin_S, Emin_S is not updated.

  From the tidal current calculation data selection means 151 in the measuring instrument installation position determination means 15, the minimum evaluation value installation position executable solution selection means 155 performs the above-described solution calculation by the repetition maximum preset by the calculation condition setting means 123. It is configured to repeatedly calculate until the number of times Lx is reached. Note that, when the evaluation value Emin falls below a preset target value by the minimum evaluation value installation position executable solution selection means 155, it is possible to exit the solution calculation loop or forcibly terminate it.

(g) Calculation result output means 16 FIG. 7
In the calculation result output means 16, the result output format designation means 161 receives the output data item and output format designated by the user and sends the data to the result output format setting means 162. The result output format setting unit 162 takes out data that matches the specified output data item from the calculation data storage unit 14, processes the data according to the output format specified by the user, and creates an output data list. The result is sent to the result output means 163. The result output unit 163 outputs the output data list created by the result output format setting unit 162 to a computer screen or a printer.

  That is, the data list of the final stage instrument installation position executable solution created by the minimum evaluation value installation position executable solution selection means 155 is displayed together with the overall evaluation value, the evaluation value of only the calculation error, or the evaluation value of the instrument cost. It is a means for outputting to a computer screen or a printer. These data lists are arranged in the order of evaluation value size, and it is possible to easily confirm the installation position combination of the measuring instrument that minimizes the evaluation value to be emphasized.

(2) Operation of Embodiment Hereinafter, the operation of the measuring instrument installation position determination system of the present embodiment having the above-described configuration will be described with reference to the flowchart of FIG.

(a) Overall processing flow ... Fig. 10
The outline of the processing in the measuring instrument installation position determination system of this embodiment is as shown in FIG. 10, and system data setting / change processing (step 101), calculation condition designation / change processing (step 102), calculation data It comprises a creation process (step 103), a target power system voltage / tidal current distribution state determination process (step 104), a measuring instrument installation position determination process (step 105), and a calculation result output process (step 106). Each of these processes is executed by each means shown in FIG.

(b) System data setting / changing process ... Fig. 11
Details of the system data registration / recording process in step 101 of FIG. 10 are as follows. That is, as shown in FIG. 11, the power system data setting / changing unit 111 accepts an instruction to newly set, change, and delete facility data and supply / demand data of the target power system, and the data confirmation registration unit 113. The data is sent (step 111).

  For each received data, the data check registration means 113 checks whether or not the data is within a preset valid data range (step 112). If not (NO at step 112), The data is output to the data output means 118, and message data for instructing the user to set the power system data again is sent (step 113). On the other hand, if the data is within the valid range, the data is recorded in the power system database (power system DB) 115 (step 114).

  The data recorded in the power system DB 115 is taken out from the power system DB 115 together with data recorded in the calculation condition DB 116 (to be described later) (or the power system data alone) and specified by the user from preset output formats. The selected output format is selected, the data is processed into the output format, and sent to the data output means 118 (step 115). The data output means 118 outputs the received data to an output device such as a printer or a display (step 116).

(c) Calculation condition designation / change processing ... Figure 12
The calculation condition designation / change process in step 102 in FIG. 10 is performed by the calculation condition designation / change means 112 in order to determine the installation position of the measuring instrument in the target power system, and the number of measuring instrument installation candidates. Data confirmation registration means that accepts instructions such as position availability / no-installation conditions, installation priority conditions, installation interval conditions, and valid / invalid designation such as evaluation reference values for judging the end of calculation, change of designated values, release of designation, etc. 114 (step 121). In this case, the evaluation reference value or the like is performed by setting a value to a flag or variable used in the calculation process.

  The data confirmation registration means 114 checks whether there is a defect in the valid / invalid / cancel designation of the received condition designation value or condition (step 122), and if there is a problem (in step 122). (YES), the problematic condition designation and the message data notifying that the condition is designated again are sent to the data output means 118 (step 123). On the other hand, if there is no problem with the condition designation or the designated value, the designated condition is recorded in the calculation condition database (calculation condition DB) 116 (step 124).

  The condition recorded in the calculation condition DB 116 is taken out from the calculation condition DB 116 together with the data recorded in the power system DB 115 (or the condition alone), and the output format designated by the user from the preset output formats. The data is processed into the output format and sent to the data output means 118 (step 125). The data output means 118 outputs the received data to an output device such as a printer or a display (step 126).

(d) Calculation data creation process ... FIG.
As shown in FIG. 13, the calculation execution command receiving means 121 receives a calculation execution command transmitted by the user pressing a calculation execution button or the like, and sends a calculation start signal to the data creation means 122. (Step 131).

  The data creation unit 122 extracts the facility data and power supply / demand data of the target power system specified by the user from the power system DB 115, converts them into power flow calculation data (step 132), and sends the data to the power flow calculation data storage unit 141. Then, a processing end signal is sent to the calculation condition setting means 123 (step 133). That is, the data creation means 122 is the distribution system distribution lines and switches, utility poles, distribution line connection information, voltage regulation equipment, connection load information recorded in the power system database 115 by the power system data setting / change means 111. Data, etc., supply and demand cross-section number S and supply / demand cross-section data for each distribution line, and create power flow calculation processing data used to calculate the distribution of voltage and power flow in the distribution system. The data is sent to the calculation data storage means 141.

  The calculation condition setting means 123 extracts the calculation conditions from the calculation condition DB 116, processes them into the condition data necessary for the tidal current calculation (step 134), sends it to the tidal current calculation data storage means 141, and sends a processing end signal to the target power. This is sent to the power flow calculation data selection means 131 of the system voltage / power flow distribution state determination means 13. The tidal current calculation data storage means 141 records the tidal current calculation data and calculation condition data of the target power system (step 135).

(e) Target power system voltage / tidal current distribution state determination process ... FIG.
As described above, after the power flow calculation data and the calculation condition data of the target power system are recorded in the storage unit 141, the data is used in step 104 of FIG. Voltage and power flow distribution are calculated. This target power system voltage / tidal current distribution state determination process is repeatedly executed for each of the supply and demand sections 1 to S, as indicated by LOOP1 in FIG.

  First, the tidal current calculation data selection means 131 selects tidal current calculation data related to the demand / supply section j from the tidal current calculation data storage means 141 as the j-th loop (step 141), and uses this calculation data for details. The detailed tide (voltage / tidal current distribution state) for the supply and demand section j selected by the tide calculating means 132 is calculated (step 142). This calculation result is stored in the detailed power flow calculation result storage means 142 (step 143).

  Next, the voltage and phase of each node (switch or the like) in the supply and demand section j, the current and phase that pass through, for each node that is a measurement device installation candidate position by the measurement device installation candidate position electricity quantity calculation means 133. The power factor is calculated (step 144), and the calculation result is stored in the measuring instrument installation candidate position electric quantity storage means 143 as a calculated value of the supply and demand section j (step 145). The calculation of each amount of electricity in step 114 is based on the relationship between the node voltage and the node load shown in FIG. 9 and the branch connected to the node, the voltage Vm of the measuring instrument constituting each node, the current Im passing therethrough, and The power factor PFm is calculated according to the above [Equation 1].

  These processes are repeatedly executed for each supply and demand section 1 to S, and finally, the voltage / tidal current distribution state of the supply and demand section 1 to S is calculated and stored for each target distribution system, and the next measuring instrument installation position determination process ( Proceed to step 105) in FIG.

(f) Measuring instrument installation position determination process ... FIGS.
In this process, first, the instrument installation position solution candidate determination means 152 sets the instrument initial installation position (step 151). That is, in the instrument initial installation position solution candidate determining means 152, ½ of the number obtained by subtracting the number of required installation measuring instruments that are always installed from the maximum number of installed measuring instruments set by the calculation condition designating / changing means 112 is calculated. The initial installation position of the measuring instrument is selected from the nodes included in the distribution system model data and initialized.

  Next, for each measuring instrument constituting each node of the set initial installation position, each electricity quantity calculated in step 144 is taken out for each supply and demand section 1 to S, and the electricity quantity is measured to calculate the power flow. And the calculation error is calculated (step 152). This multi-demand / supply cross-section measured value utilization power flow calculation process is repeated for each of the receiving cross-sections 1 to S, as indicated by LOOP4 in FIG.

  That is, first, the measurement value utilization power flow calculation means 153 calculates the electrical quantities such as the voltage, voltage phase, current, current phase, power factor, etc. of each node set as the initial installation position of the measurement instrument as the measurement instrument installation candidate position electrical quantity. It is taken out from the storage means 143 (step 161). Then, using this extracted amount of electricity, the node / voltage / branch flow (active power, reactive power), power loss, and other voltage / power distribution calculation processing are executed, and the measured value-based power flow calculation processing is performed. The data is stored in the storage means 144 (step 162).

  Next, the tidal current calculation result evaluation unit 154 includes the detailed tidal current calculation result data of the target distribution system data recorded in the detailed tidal current calculation result storage unit 142 and the measurement recorded in the measured value utilization tidal current calculation result recording unit 144. From the value utilization power flow calculation result data, the voltage of each node, the error of the passing active power and the reactive power are calculated according to the above [Equation 2] (step 163). This error calculation is executed for the supply and demand sections 1 to S by repeating LOOP4, and the calculation errors in the respective sections are stored in the measured value utilization power flow calculation result storage unit 144 (step 164).

  As described above, after the measurement value-based power flow calculation process is completed for each of the supply and demand sections 1 to S at the initial installation position, the process returns to the evaluation value calculation process (step 153) of step 153 in FIG. The means 154 calculates the evaluation value E (0) with respect to the initial installation position of the measuring instrument according to the above [Equation 3] using the calculation error calculated in each of the supply and demand sections 1 to S. The evaluation value E (0) for this initial installation position is stored in the evaluation value storage means 145 as the evaluation value minimum value Emin at this time.

  After the initial installation position and the evaluation value E (0) for the initial installation position are determined as described above, a plurality (k) of combinations of the installation positions of the measuring instruments are created as solution candidates, and the plurality of solution candidates are created. The same evaluation values E (1) to E (k) are calculated for 1 to k by the same calculation as the initial installation position. In this case, the number of calculations for the solution candidates 1 to k is repeatedly executed for the number of times 1 to Lx designated in advance by the calculation condition designating / changing means 112 as shown in the solution calculation loop LOOP2 in FIG. Hereinafter, processing in the solution calculation loop LOOP2 will be described.

  First, the measuring instrument installation position candidate determination unit 152 uses a predetermined setting rule based on the measuring instrument installation position combination h selected at the present stage (in the case of 1 repetition, the initial installation position). Accordingly, the installation positions of some measuring instruments are moved to make new installation positions, and a new instrument installation position combination h ′ is created. As a result of this processing, solution candidates for measuring instrument installation position combinations are determined by the number of 1 to k (step 154). In this determination, a combination that satisfies the constraint conditions set by the calculation condition designating / changing means 112, such as the maximum number of measuring instruments, installation availability conditions, and installation interval conditions, is selected.

  Next, as shown in LOOP3 of FIG. 15, the solution installation position combination solution candidates 1 to k are processed by a plurality of supply / demand cross-section measured value using power flow calculation processing (step 155) and evaluation value calculation processing (step 156), respectively. And the evaluation values E (1) to E (k) of the solution candidates 1 to k are calculated, respectively. In the two processes, the power flow calculation is performed for each of the supply and demand sections 1 to S of the respective solution candidates 1 to k to obtain an evaluation value in the same manner as that performed in steps 152 and 153 for the initial installation position.

  When the evaluation values (1) to E (k) of the solution candidates 1 to k are all calculated, the evaluation values of the solution candidates 1 to k are set in advance by the instrument installation executable solution selection unit 155. Comparison with the evaluation value criterion is performed, a solution candidate whose evaluation value exceeds the evaluation value criterion is selected as an executable solution, and data rearranged in ascending order of evaluation value is created.

  Subsequently, the minimum evaluation value Emin is extracted from the data list created by the instrument installation feasible solution selection means 155, and the evaluation value minimum value Emin_S stored in the calculations up to the present stage (when the number of repetitions is 1) Is compared with the evaluation value stored in the evaluation value storage means 145 as the evaluation value E (0) of the initial value installation position (the evaluation value minimum value Emin_S) (step 158).

  When the minimum evaluation value Emin extracted from the data list is smaller than the recorded evaluation value minimum value Emin_S up to the present (YES in step 158), the minimum evaluation value storage unit 47 The value of Emin_S is replaced with the value of Emin (step 159). On the other hand, if Emin is larger than Emin_S, the process proceeds to step 160 without updating Emin_S.

  In step 160, the measurement value installation feasible solution selection means 155 creates a data list in which the instrument installation position feasible solutions obtained up to the present stage are rearranged in the order of the minimum evaluation value, and the minimum evaluation value Emin. Is selected as a new instrument installation position combination solution.

  As described above, after the instrument setting position combination solution having the minimum evaluation value Emin is selected, the first solution calculation calculation loop is terminated, and only the preset maximum number of repetitions Lx is performed in steps 154 to 154. The process of 160 is repeated, the above repeated calculation is terminated at the maximum number of times Lx, the solution calculation loop is exited, and the process returns to the calculation result output process (step 106) of FIG. In this case, the measuring instrument installation feasible solution selection means 155 may be configured to exit or forcibly terminate the solution calculation loop when the evaluation value Emin falls below a preset target value.

  The number of repetitions 1 to Lx is determined by the user by the calculation condition designating / changing means 112 as described above, and the determination process of the measuring instrument installation position solution in step 154 is performed for each number of repetitions. The calculation condition designating / changing means 112 can also be designated as to whether or not to do so.

  For example, in the embodiment, the installation position and the number of measuring instruments are changed with the initial installation position as a reference, but the second and subsequent iterations are excluded when the initial installation position is selected in step 151. New installation position solution candidates 1 to k can be determined by changing the installation positions and the number of measuring instruments with reference to other installation position candidates. Also, new installation position solution candidates 1 to k may be determined based on the installation position combination executable solution obtained at the number of repetitions of 1. In addition, new installation position solutions can be created based on other installation position candidates obtained by adding / deleting new instrument installation positions according to predetermined rules or changing the positions from the initial installation position. Candidates 1 to k can also be created.

(g) Calculation result output processing ... FIG.
Subsequently, in step 605 of FIG. 6, a data list of the final-stage measuring instrument installation position executable solution created by the minimum evaluation value installation position executable solution selection unit 48 by the result output unit 5 is obtained as a comprehensive evaluation value, Along with the evaluation value of only the calculation error or the evaluation value of the measuring instrument cost, it is output to a computer screen or printer. That is, the result output format setting means 161 takes out data that matches the designated output data item from the calculation data storage means 14, processes the data according to the output format designated by the user, and creates an output data list. It is created and sent to the result output means 163 (step 2603). The result output means 163 outputs the output data list created by the result output format setting means 162 to the computer screen or printer (step 2604). By arranging and outputting the data list in the order of the evaluation value in this way, the user can easily confirm the installation position combination of the measuring instrument that minimizes the important evaluation value.

(3) Effect of the embodiment According to the present embodiment, when calculating the voltage / tidal current distribution of the distribution system using the measurement value of the measuring instrument, based on the detailed tidal current calculation results for a plurality of supply and demand sections, By searching for the combination of the installation positions of the measuring instruments so that the evaluation value becomes small, it is possible to determine the installation position of the measuring instrument with a small number of measuring instruments and the smallest calculation error.

  In the above embodiment, the installation availability conditions such as “installation possible”, “installation required”, and “installation impossible” are set for a plurality of candidates for the installation positions of the measuring instruments, which can be executed in an actual power distribution system. Only the installation position of the measuring instrument can be determined.

  In addition, since the evaluation formula is composed of the calculation error of the quantity of electricity of the target system and the number of measuring instruments or measuring instrument costs, "calculation error is the smallest" or "the number of measuring instruments or the instrument cost is smallest" It becomes possible to select a feasible solution that emphasizes either one of the above.

  Furthermore, combinations of measuring instrument installation positions are output side by side in ascending order of the calculated overall evaluation value, and the partial evaluation values that make up the overall evaluation value are also output together. A wider range of positions can be selected.

The block diagram which shows one Embodiment of the measuring device installation position determination apparatus by this invention. The block diagram which shows the system | strain data registration and recording means in the apparatus of FIG. FIG. 2 is a block diagram showing calculation data creation means in the apparatus of FIG. 1. The block diagram which shows the object electric power system voltage and tidal current distribution state determination means in the apparatus of FIG. The block diagram which shows the data storage means for calculation in the apparatus of FIG. The block diagram which shows the measuring device position determination means in the apparatus of FIG. The block diagram which shows the calculation result output means in the apparatus of FIG. The connection diagram which shows an example of a structure of a power distribution system, and the figure which expressed it with the node and the branch. The figure which shows the relationship between a node branch calculation result and measuring device electric quantity. The flowchart which shows the whole process in the measuring device installation position determination method of this invention. The flowchart which shows the system | strain data registration and recording process in FIG. 11 is a flowchart showing calculation condition designation / change processing in FIG. 11 is a flowchart showing calculation data creation processing in FIG. 10. The flowchart which shows the object electric power system voltage and tidal current distribution state determination processing in FIG. The flowchart which shows the measuring device installation position determination process in FIG. The flowchart which shows the multiple supply-and-demand cross-section measured value utilization power flow calculation process in FIG. The flowchart which shows the calculation result output process in FIG.

Explanation of symbols

6 ... System power supply 6a ... Main system bus 6b ... Distribution transformer 6c ... High voltage distribution bus 7 ... High voltage distribution system 7a ... Circuit breaker 7b ... Switch 7c ... Switch 7d with measuring instrument ... Electric pole 7e ... Spacing distribution line 7f ... Branch point 8 ... Distributed power supply 9 ... Data structure for power flow calculation 9a ... Slack node 9b ... Node 9c ... Measurement installation node 9d ... Branch 10 ... Distributed power supply node 11 ... System data registration / recording means 111 ... Power system Data setting / changing means 112 ... Calculation condition designation / changing means 113, 114 ... Data confirmation registration means 115 ... Power system database 116 ... Calculation condition database 117 ... Data output format setting means 118 ... Data output means 12 ... Calculation data creation means 121 ... Data creation means 122 ... Calculation condition setting means 123 ... Calculation execution command receiving means 13 ... Target power system voltage / tidal current distribution State determination means 131 ... Tidal current calculation data selection means 132 ... Detailed tidal current calculation means 133 ... Measuring instrument installation candidate position electricity quantity extraction means 14 ... Calculation data storage means 141 ... Tidal current calculation data storage means 142 ... Detailed tidal current calculation result storage Means 143 ... Measuring instrument installation candidate position electricity quantity storage means 144 ... Measuring instrument utilization power flow calculation result storage means 145 ... Evaluation value storage means 146 ... Measuring instrument installation executable solution storage means 15 ... Measuring instrument installation position determination means 151 ... Tidal current calculation Data selection means 152 ... Measuring instrument installation position candidate determination means 153 ... Measured value utilization tidal current calculation means 154 ... Tidal current calculation result evaluation means 155 ... Measuring instrument installation executable solution selection means 16 ... Calculation result output means 161 ... Result output format Designating means 162 ... Result output format setting means 163 ... Result outputting means

Claims (10)

Power system configuration and demand data, grid data registration / recording means for setting / registering calculation conditions,
Calculation data creation means for creating calculation data used to calculate the state of the power system from the registered data;
A target power system voltage / tidal current distribution state determining means for calculating a plurality of voltage / tidal current distribution states of a power system to be calculated and calculating an electric quantity of a measuring device installation position candidate point;
Calculation data storage means for storing calculation data and calculation results;
Instrument setting position determining means for temporarily setting positions of a plurality of measuring instruments installed in the system, calculating a system state, and selecting a plurality of measuring instrument installation positions;
A measuring instrument installation position determining device comprising calculation result output means for outputting calculation data and calculation results in accordance with a user's designation. The target power system voltage / tidal current distribution state determining means,
Tidal current calculation data selection means for selecting target tidal current calculation data from a plurality of tidal current calculation data;
A detailed tidal current calculation unit that performs tidal current calculations using the selected tidal current calculation data;
Consists of a measuring instrument installation candidate position electric quantity extraction means that extracts the electric quantity of the measuring instrument installation position candidate point from the tidal current calculation result and stores it in the calculation data storage means in correspondence with the measuring instrument installation position candidate point The measuring instrument installation position determining apparatus according to claim 1, wherein The measuring instrument installation position determining means is
Tidal current calculation data selection means for selecting target tidal current calculation data from a plurality of tidal current calculation data;
A measuring instrument installation position solution candidate determining unit for selecting a plurality of measuring instrument installation position solution candidates from the measuring instrument installation position candidate points;
A measured value-based power flow calculation unit that calculates the voltage and power flow distribution state of the target power system, using the electricity quantity of the selected multiple instrument installation position solution candidates as a measured value,
By comparing the results of calculation-based power flow calculation and detailed power flow calculation results, and using the evaluation formula consisting of the calculation error of each quantity of electricity and the number of measuring instruments or measuring instrument cost, the evaluation value of the selected measuring instrument location solution candidate A tidal current calculation result evaluation means for calculating and evaluating
2. The measuring instrument installation position determination according to claim 1, comprising measuring instrument installation position executable solution selection means for selecting a plurality of executable instrument installation position solutions from the evaluation result of the tidal current calculation result. apparatus. The calculation result output means includes
A calculation result output format specifying means for specifying a calculation result output format;
Result output format setting means for setting the output format of the calculation result according to the specified condition,
2. The measuring instrument installation position determining apparatus according to claim 1, further comprising result output means for displaying or printing the calculation result in accordance with a set result output format. System data setting / change means realized on a computer, calculation condition designation / change means, system voltage / tidal current distribution state determination means, instrument installation position determination means, and calculation result output means, installation of measuring instruments in the power system In a method for determining a position,
A process in which the grid data setting / changing means sets the configuration of the power grid and power demand data, etc.
Calculation condition designation / change means accepts instructions from the user and sets calculation conditions;
A system voltage / tidal current distribution state determination means obtains a plurality of system states based on the set power system configuration and power demand data and calculation conditions;
The instrument installation position determining means temporarily sets the positions of a plurality of measuring instruments installed in the system, calculates the system state, and selects the installation positions of the plurality of measuring instruments,
The calculation result output means comprises a process of outputting a plurality of feasible solutions for the determined installation positions of the plurality of measuring instruments. In the calculation condition setting process,
Set the conditions of “Installable”, “Installation Required”, and “Not Installable” for multiple candidate installation positions of the target system,
6. The measuring instrument installation position determining method according to claim 5, wherein in the measuring instrument installation position determining process, a measuring instrument installation position satisfying the setting condition is determined. In the instrument installation position determination process,
The evaluation value is calculated for each of a plurality of combinations in which the installation positions of the measuring instruments are temporarily set by an evaluation formula consisting of the calculation error of the amount of electricity of the target system and the number of measuring instruments or measuring instrument costs. 5. The measuring instrument installation position determination method according to 5. In the result output process,
Based on the evaluation value calculated in the instrument installation position determination process, outputs a plurality of combinations of the instrument installation positions in order from the smallest overall evaluation value, and also combines the partial evaluation values that make up the overall evaluation value 6. The measuring instrument installation position determining method according to claim 5, wherein the measuring instrument setting position is output. Computer
Power system configuration and demand data, grid data registration / recording means for setting / registering calculation conditions,
Calculation data creation means for creating calculation data used to calculate the state of the power system from the registered data;
A target power system voltage / tidal current distribution state determining means for calculating a plurality of voltage / tidal current distribution states of a power system to be calculated and calculating an electric quantity of a measuring device installation position candidate point;
Calculation data storage means for storing calculation data and calculation results;
Instrument setting position determining means for temporarily setting positions of a plurality of measuring instruments installed in the system, calculating a system state, and selecting a plurality of measuring instrument installation positions;
A measuring instrument installation position determination program for functioning as calculation result output means for outputting calculation data and calculation results according to a user's specification. Using a computer
A process in which the grid data setting / changing means sets the configuration of the power grid and power demand data, etc.
Calculation condition designation / change means accepts instructions from the user and sets calculation conditions;
A system voltage / tidal current distribution state determination means obtains a plurality of system states based on the set power system configuration and power demand data and calculation conditions;
The instrument installation position determining means temporarily sets the positions of a plurality of measuring instruments installed in the system, calculates the system state, and selects the installation positions of the plurality of measuring instruments,
A calculation instrument output position determining program that causes the calculation result output means to execute a process of outputting a plurality of executable solutions for the determined installation positions of a plurality of instruments.

Images