JP2018196312A - Overload detector, power transmission controller, overload detection method, and program - Google Patents

Abstract

To make it possible to detect an overload state in a power transmission line before the overload state is actually caused.SOLUTION: Power generation prediction data acquisition means 11 acquires power generation prediction data showing a result of predicting power generated by a power generator for generating power using renewable energy. Substation power data acquisition means 12 acquires substation power data including data showing power transmission power to be supplied from a substation to a power transmission line. Section power calculation means 13, on the basis of the power generation prediction data and the substation power data, calculates section power for each of a plurality of division sections obtained by dividing a power transmission section using connection nodes for the power generator. Overload determination means 14 compares the section power with a threshold set for each division section to determine whether or not an overload state will occur for each division section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an overload detection device, method, and program, and more particularly to an overload detection device, method, and program for detecting an overload state of a transmission line.

  Moreover, this invention relates to the power transmission control apparatus which performs power transmission control of the said power transmission line.

  Devices for protecting transmission lines from overcurrent (overload) are known. For example, Patent Literature 1 describes an apparatus that measures an electric current flowing through a power transmission line and detects an overload state when the measured current exceeds a predetermined set value. Patent Document 2 discloses a device that calculates a conductor temperature of a transmission line based on a current flowing through the transmission line and an ambient temperature of the transmission line, and detects an overload state when the conductor temperature exceeds a predetermined set value. Is described.

  Here, a generator that generates power using renewable energy such as sunlight or wind power may be connected to the transmission line. In general, the power generated by such a generator depends on weather conditions and the like. Regarding generation prediction of renewable energy, Patent Document 3 discloses predicting generation power based on various weather conditions such as solar radiation, wind speed, temperature, and rainfall.

JP 2004-129428 A Japanese Patent Laid-Open No. 4-317511 JP 2014-26625 A

  In Patent Documents 1 and 2, when an overload state of a transmission line is detected, a circuit breaker disposed between the generator and the transmission line is controlled to stop power transmission from the generator to the transmission line. Thus, it is described that an overload state of the transmission line is avoided. However, in these documents, the overload state can be detected only afterwards, and the overload state cannot be detected in advance. For this reason, for example, if the current increases rapidly and the magnitude of the current exceeds an allowable value before an overload is detected, the transmission line may be damaged. Patent Document 3 merely discloses predicting the generated power of renewable energy, and does not provide a means for solving the above problems.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an overload detection device, a power transmission control device, an overload detection method, and a program capable of detecting an overload state of a transmission line before an actual overload state occurs. And

  In order to achieve the above object, the present invention generates power using renewable energy, and generates power generation prediction data indicating a prediction result of power generated by a generator that supplies power to a transmission line connected via a circuit breaker. Power generation prediction data acquisition means for acquiring substation power data acquisition means for acquiring substation power data including data indicating transmission power supplied from a substation to the transmission line, the power generation prediction data, and the substation Section power calculation means for calculating section power indicating the power of each divided section for each of a plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator based on the power data; An overload determination unit that compares the section power with a threshold set for each divided section and determines whether or not an overload condition occurs in each of the divided sections; Providing load detecting device.

  The present invention also provides power generation prediction data for generating power generation prediction data indicating a prediction result of power generated by a generator that generates power using renewable energy and supplies power to a transmission line connected via a circuit breaker. Based on the acquisition means, the substation power data acquisition means for acquiring substation power data including data indicating the transmission power supplied from the substation to the transmission line, the power generation prediction data, and the substation power data Section power calculating means for calculating section power indicating the power of each divided section for each of a plurality of divided sections obtained by dividing the power transmission section of the transmission line at a connection node of the generator; An overload determination unit that compares a threshold set for the section and determines whether or not an overload condition occurs for each of the divided sections; and Providing power transmission control device and a circuit breaker control means for controlling the breaker according to the constant results.

  The present invention predicts the generated power of a generator that generates power using renewable energy, and supplies power to a transmission line connected via a circuit breaker, and is transmitted power supplied from a substation to the transmission line The substation power data including the data indicating the power generation is obtained, and based on the power generation prediction data indicating the prediction result of the power generation of the generator and the substation power data, the transmission section of the transmission line is connected to the generator. For each of the plurality of divided sections divided by the node, a section power indicating the power of each divided section is calculated, the section power is compared with a threshold set for each divided section, and the divided sections An overload detection method for determining whether or not an overload condition occurs for each of the above is provided.

  The present invention obtains power generation prediction data indicating a prediction result of power generation of a generator that generates power using a renewable energy and supplies power to a transmission line connected via a circuit breaker to a computer. Acquiring substation power data including data indicating transmission power supplied from the station to the transmission line, and based on the power generation prediction data and the substation power data, the transmission section of the transmission line is For each of the plurality of divided sections divided by the connection node, the section power indicating the power of each divided section is calculated, the section power is compared with a threshold value set for each divided section, and the divided A program for executing a process of determining whether or not an overload condition occurs in each section is provided.

  The overload detection device, the power transmission control device, the overload detection method, and the program of the present invention can detect the overload state of the transmission line before the actual overload state occurs.

The block diagram which shows the schematic power transmission control apparatus of this invention. The block diagram which shows the power transmission system containing the overload detection apparatus which concerns on one Embodiment of this invention. The block diagram which shows the structure of a power transmission line overload detection apparatus. The system diagram which shows a power transmission system. The figure which shows the area power formula used for calculation of area power. The table | surface which shows the determination threshold value set to each division | segmentation area. The system diagram which shows the numerical example of area electric power. The table | surface which shows the presence or absence of generation | occurrence | production of an area electric power calculation formula, a calculation result, a judgment threshold value, and an overload condition. The table | surface which shows the correspondence between the division | segmentation area and the generator to interrupt | block. The flowchart which shows the operation | movement procedure at the time of interruption | blocking. The flowchart which shows the operation | movement procedure at the time of recovery.

  Prior to the description of the embodiments of the present invention, an outline of the present invention will be described. FIG. 1 shows a schematic power transmission control device (system) of the present invention. The power transmission control device 20 includes a power generation prediction data acquisition unit 11, a substation power data acquisition unit 12, a section power calculation unit 13, an overload determination unit 14, and a circuit breaker control unit 21. Among the components of the power transmission control device 20, the power generation prediction data acquisition unit 11, the substation power data acquisition unit 12, the section power calculation unit 13, and the overload determination unit 14 constitute the overload detection device 10.

  The overload detection device 10 determines whether or not an overload state has occurred in a transmission line to which a generator that generates power using renewable energy is connected. Each generator is connected to a transmission line via a circuit breaker. The power generation prediction data acquisition unit 11 acquires power generation prediction data indicating a prediction result of power generated by a generator that generates power using renewable energy. The substation power data acquisition means 12 acquires substation power data including data indicating transmission power supplied from the substation to the transmission line to which the generator is connected.

  The section power calculation means 13 indicates the power of each divided section for each of a plurality of divided sections obtained by dividing the transmission section of the transmission line at the connection node of the generator based on the power generation prediction data and the substation power data. The section power is calculated. The overload determination unit 14 compares the calculated section power with a threshold set for each divided section. The overload determination unit 14 determines whether or not an overload state occurs for each of the divided sections based on the comparison result. The circuit breaker control means 21 controls the circuit breaker arranged between the generator and the power transmission line according to the determination result in the overload determination means 14.

  In the present embodiment, the transmission power in each divided section is calculated based on the power transmitted from the substation to the transmission line and the predicted value of the generated power of the generator that generates power using renewable energy. In the present invention, the occurrence of an overload condition can be detected at a stage before the actual overload condition occurs by determining the presence or absence of an overload condition using the predicted value of the generated power. When the occurrence of an overload condition is detected, it is possible to avoid the overload condition by controlling the circuit breaker and stopping power transmission from the generator to the transmission line.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows a power transmission system including an overload detection device according to an embodiment of the present invention. This power transmission system includes a remote monitoring control device 101, a power transmission line overload detection device 102, a power generation prediction device 103, a substation 104, and a circuit breaker 105.

  The remote monitoring control device 101 is disposed in a central control room of an electric power company, for example. The remote monitoring and control apparatus 101 is connected to the substation 104 via a communication line, and performs monitoring and control of the substation 104. The remote monitoring and control device 101 includes, for example, a communication device that communicates with a control device installed in a remote substation 104, a display device that displays various information to an operator, an operation console that receives an operator's operation, and various calculations and controls. Includes servers to perform. The remote monitoring control device 101 also performs control such as operation and stop of a power plant (not shown).

  The power generation prediction device 103 predicts the generated power of a generator (a power plant having such a generator) that generates power using renewable energy. The power generation prediction device 103 predicts generated power based on weather conditions such as sunlight, temperature, wind speed, and rainfall. The algorithm used when the power generation prediction device 103 predicts the generated power is not particularly limited, and the power generation prediction device 103 predicts the generated power using an arbitrary calculation method.

  The transmission line overload detection device 102 detects an overload state of a transmission line connecting between the substations 104. For example, the power transmission line overload detection device 102 divides the power transmission line into sections for each substation 104 or a power station (not shown), and determines whether or not an overload condition occurs in each section. In the present embodiment, the power transmission line overload detection device 102 uses the generated power predicted by the power generation prediction device 103 to determine whether or not an overload condition occurs. When the power transmission line overload detection device 102 determines that an overload condition occurs, the power transmission line overload detection device 102 requests the remote monitoring control device 101 to control the circuit breaker 105 and reduces the transmission power to the power transmission line.

  The transmission line overload detection device 102 and the power generation prediction device 103 are configured as a computer device including a processor and a memory, for example. The transmission line overload detection device 102 and the power generation prediction device 103 do not need to be physically separated, and may be configured as one device. Alternatively, at least one of the transmission line overload detection device 102 and the power generation prediction device 103 may be a part of the remote monitoring control device 101. The transmission line overload detection device 102 corresponds to the overload detection device 10 in FIG. 1, and the remote monitoring control device 101 and the transmission line overload detection device 102 correspond to the power transmission control device 20 in FIG. 1.

  FIG. 3 shows the configuration of the power transmission line overload detection device 102. The transmission line overload detection device 102 includes a data reception unit 121, a data input unit 122, a data storage unit 123, a section power calculation unit 124, an overload determination unit 125, and a cutoff request unit 126. In the transmission line overload detection device 102, for example, the functions of the data reception unit 121, the section power calculation unit 124, the overload determination unit 125, and the cutoff request unit 126 can be realized by a computer operating according to a program.

  The data receiving unit 121 acquires, from the power generation prediction device 103, power generation prediction data indicating a prediction result of the generated power of the generator that generates power using renewable energy. The power generation prediction device 103 predicts the generated power for the next day, for example. The power generation prediction device 103 predicts the generated power in a predetermined time unit, for example, 30 minutes, and transmits the prediction result to the transmission line overload detection device 102. For example, the data reception unit 121 acquires power generation prediction data obtained by predicting the power generation of the next day on the previous day. When the prediction result of the generated power is changed on that day, the data receiving unit 121 acquires the generated power generation prediction data after the change.

  In addition, the data reception unit 121 acquires substation power data including data indicating transmission power supplied from the substation 104 (see FIG. 2) to the transmission line from the remote monitoring control device 101. The data receiving unit 121 acquires, for example, data indicating a transmission line current from the remote monitoring control device 101. The data reception unit 121 acquires data indicating the current transmission power from the remote monitoring control device 101 at a predetermined cycle, for example. The data reception unit 121 receives data indicating transmission power transmitted from the substation 104 to the transmission line from the remote monitoring control device 101, for example, every 30 minutes, and data indicating reception power received by the substation 104 from the transmission line. And get. The data receiving unit 121 functions as the power generation prediction data acquisition unit 11 and the substation power data acquisition unit 12 in FIG.

  The data input unit 122 includes various information indicating a transmission line section, section power calculation formula, determination threshold for overload, a generator to be cut off when an overload condition occurs, and a cut-off order at that time Enter. The data input unit 122 includes an input device such as a keyboard and a pointing device. The data storage unit 123 is an auxiliary storage device such as a hard disk device, for example, and stores power generation prediction data and substation power data acquired by the data reception unit 121 and various data input from the data input unit 122.

  The section power calculation unit 124 indicates the power of each divided section for each of a plurality of divided sections in which the transmission section of the transmission line is divided at the connection node of the generator based on the power generation prediction data and the substation power data. The section power is calculated. The section power calculation unit 124 calculates section power according to a section power calculation formula defined according to the connection relationship between the substation and the generator with respect to the transmission line, for example. The section power calculation formula is input from the data input unit 122 and stored in the data storage unit 123. The section power calculation formula is defined for each power transmission / reception pattern of a substation connected to a transmission line, for example.

  The overload determination unit 125 determines whether or not an overload state occurs for each of the divided sections based on the section power calculated by the section power calculation unit 124. In the determination of the overload state, the overload determination unit 125 compares the section power with the determination threshold set for each divided section. The overload determination unit 125 determines that an overload condition occurs when the section power is greater than or equal to the determination threshold, and determines that no overload condition occurs when the section power is less than the determination threshold. The determination threshold value is input from the data input unit 122 and stored in the data storage unit 123.

  When the overload determination unit 125 determines that an overload condition occurs, the cutoff request unit 126 transmits a cutoff request for the circuit breaker 105 to the remote monitoring control device 101. The remote monitoring control device 101 has means corresponding to the circuit breaker control means 21 of FIG. To do. When the overload determination unit 125 determines that an overload condition occurs, the cutoff request unit 126 determines the circuit breaker 105 corresponding to at least one of the generators connected to the divided section determined to have an overload condition. And at least one of the generators is separated from the transmission line. The shut-off request unit 126 separates (shuts down) the shut-off target generator set for each divided section, for example, based on a predetermined shut-off order.

  In the above description, the transmission line overload detection device 102 acquires the substation power data from the remote monitoring control device 101. However, the present invention is not limited to this, and the transmission line overload detection device 102 is connected to the substation 104. It is good also as collecting electric power data from. Moreover, although the transmission line overload detection apparatus 102 demonstrated the example which opens and closes the circuit breaker 105 through the remote monitoring control apparatus 101 above, it is not limited to this. The transmission line overload detection device 102 may have means corresponding to the circuit breaker control means 21, and may control the opening / closing of the circuit breaker 105 without using the remote monitoring control device 101.

  FIG. 4 shows a power transmission system. Here, the substation A141 and the substation B142 are considered as the substation 104 (refer FIG. 2), and the case where these substation A141 and the substation B142 are connected by the two power transmission lines 171 and 172 is considered. . A connection node between substation A141 and power transmission line 171 is AL1, and a connection node between substation B142 and power transmission line 171 is BL1. In addition, a connection node between the substation A141 and the power transmission line 172 is AL2, and a connection node between the substation B142 and the power transmission line 172 is BL2.

  The substation A141 and the substation B142 are also connected to other substations and power plants (not shown). Substation A 141 and substation B 142 receive power from other substations and power plants, respectively, and transmit the supplied power to transmission lines 171 and 172. Or substation A141 and substation B142 receive electric power via power transmission lines 171 and 172, and supply received power to other substations etc. via other power transmission lines.

  A generator (G1) 161 and a generator (G2) 162 that generate power using renewable energy are connected to the power transmission line 171 via corresponding circuit breakers (CB1) 151 and circuit breakers (CB2) 152. The A connection node between the power transmission line 171 and the generator 161 is g1, and a connection node between the power transmission line 171 and the generator 162 is g2. On the other hand, on the transmission line 172, a generator (G3) 163 and a generator (G4) 164 that generate power using renewable energy are connected via the corresponding circuit breaker (CB3) 153 and circuit breaker (CB4) 154. Connected. A connection node between the power transmission line 172 and the generator 163 is g3, and a connection node between the power transmission line 172 and the power generator 164 is g4.

  In the above case, the power transmission section of the power transmission line 171 between the substation A141 and the substation B142 is divided into three sections of nodes AL1 to g1, nodes g1 to g2, and nodes g2 to BL2. In addition, the power transmission section of the transmission line 172 between the substation A141 and the substation B142 is divided into three sections of nodes AL2 to g3, nodes g3 to g4, and nodes g4 to BL2. The section power calculation unit 124 (see FIG. 3) calculates section power in these six sections (divided sections).

  For simplification of explanation, FIG. 4 shows a simplified system diagram, but the power transmission system may be more complicated. For example, the transmission line may have a branch point in the middle, and the power transmitted from a certain substation may be received by two substations.

  FIG. 5 shows a section power calculation formula used for calculation of section power. It is assumed that there is at least one substation that transmits power to a certain transmission line and that there is at least one substation that receives power from the transmission line. When the power of the substation node is “+” (a positive number including 0), it indicates that the substation transmits power, that is, power (current) is supplied from the substation to the transmission line. "Indicates that the substation receives power, that is, power is supplied from the transmission line to the substation.

  The section power calculation formula is defined for each power transmission / reception pattern of the substation connected to the transmission line. In FIG. 5, AL1, AL2, BL1, and BL2 described in the section power calculation formula are transmission power that the substation is currently transmitting to the transmission line, or received power that the substation is currently receiving from the transmission line. Represents. Further, g1 to g4 described in the section power calculation formula represent the generated power of the generators 151 to 154 predicted by the power generation prediction device 103 (see FIGS. 2 and 3). The section power of each divided section can be calculated by adding these absolute values according to the power transmission / reception pattern at the substation 104.

  For example, consider a case where substation A 141 transmits power to power transmission lines 171 and 172 and substation B 142 receives power from power transmission lines 171 and 172. That is, consider the case where the power of the nodes AL1 and AL2 is “+” and the power of the nodes BL1 and BL2 is “−”. In this case, the section power calculation formula of each divided section is No. 1 in FIG. 1 is defined. For example, the section power of the power transmission section (section g1 to g2) between the generator 151 and the generator 152 in the power transmission line 171 shown in FIG. 4 is the power AL1 supplied from the substation A141 to the power transmission line 171 and the power generation It is calculated as the sum (AL1 + g1) with the predicted value g1 of the generated power of the machine 151. If there are multiple substations that receive power from one transmission line, calculate the section power by dividing the section power of the divided section immediately before the branch by the ratio of the current received power of the receiving substation. Good.

  FIG. 6 shows determination threshold values set in each divided section. In this example, 500 MW is set as the determination threshold for the divided sections (power transmission sections) AL1 to g1, g1 to g2, g2 to BL1, BL2 to g4, g4 to g3, and g3 to AL2. The determination threshold value may be different for each divided section. The overload determination unit 125 (see FIG. 3) compares the section power calculated for each divided section with the determination threshold set for each divided section, and the divided section in which an overload condition occurs It is determined whether or not exists.

  FIG. 7 shows a numerical example of the section power. Here, consider a case where substation A141 transmits power to power transmission lines 171 and 172, respectively. The data reception unit 121 (see FIG. 3) acquires the current transmission power +100 MW of the node AL1 and the transmission power +200 MW of the node AL2 from the remote monitoring and control apparatus 101, and stores it in the data storage unit 123 as substation power data. Remember. In addition, the data reception unit 121 acquires the prediction result of the power generation of each generator for the next day from the power generation prediction device 103 on the previous day, and stores it as power generation prediction data in the data storage unit 123.

  FIG. 8 shows a table summarizing the section power calculation formula, the calculation result, the determination threshold value, and the presence or absence of occurrence of an overload situation in the example of FIG. In the above case, the section power calculation unit 124 sets the No. The section power of each divided section is calculated using one section power calculation formula. For example, when the data reception unit 121 acquires new substation power data and stores it in the data storage unit 123, the section power calculation unit 124 reads the substation power data from the data storage unit 123. In addition, the section power calculation unit 124 reads the power generation prediction data in the time zone next to the time zone to which the current time belongs from the data storage unit 123. The section power calculation unit 124 applies the read substation power data and power generation prediction data to the section power calculation formula, and calculates section power (its predicted value) of each divided section in the next time zone.

  In the time zone next to the time zone to which the current time belongs, the zone power calculation unit 124, for example, has a zone power of 100 MW in the divided zone of the nodes AL1 to g1, a zone power of 200 MW, and a node g2 in the divided zone of the nodes g1 to g2. A calculation result that the section power of the divided section of BL1 is 300 MW is output. In addition, in the next time zone, the section power calculation unit 124 has a section power of 600 MW in the divided sections of the nodes BL2 to g4, a section power of 400 MW in the divided sections of the nodes g4 to g3, and a section of the divided sections of the nodes g3 to AL2. A calculation result indicating that the power is 200 MW is output.

  The overload determination unit 125 compares the section power of each divided section calculated by the section power calculation unit 124 with the determination threshold value. When the determination threshold value of each divided section is 500 MW, the overload determination unit 125 determines that the section power (600 MW) of the divided sections BL2 to g4 exceeds the determination threshold value (500 MW), and then It is determined that an overload condition occurs during that time period. For the other divided sections, since the section power is below the determination threshold, it can be determined that an overload condition does not occur in the next time zone.

  FIG. 9 shows the correspondence between the divided sections and the generator that is shut off when an overload occurs. For example, the administrator uses the data input unit 122 (see FIG. 3) to transmit information on the generator to be shut off when it is determined that an overload condition is generated and the order of shutting off the transmission line overload. Input to the detection device 102. When it is determined that an overload condition occurs in any section, the shutoff request unit 126 refers to the information shown in FIG. 9 to determine which generator is shut down, that is, which breaker corresponds to which generator. Decide whether to open.

  The shut-off request unit 126 shuts off the generator through the distant monitoring control device 101 in the shut-off order set for each divided section until the overload state is resolved. For example, when it is determined that an overload condition occurs in the divided sections BL2 to g4, the shutoff request unit 126 corresponds to the distant monitoring control device 101 in the order of the generators G4, G3, G2, and G1. Requests that CB4, CB3, CB2, and CB1 be controlled to "open". The divided sections BL2 to g4 are included in the power transmission section of the power transmission line 172, and the generator (G1) 161 and the generator (G2) 162 are not directly connected to the power transmission line 172. When the interruption of the generators 161 and 162 is not effective in eliminating the overload state that occurs in the transmission line 172, the generators may be excluded from the interruption order.

  The operation procedure is shown below. FIG. 10 shows an operation procedure at the time of interruption. The administrator or the like uses the data input unit 122 (see FIG. 3) to input various information (data) necessary for system operation (step A1). In step A1, for example, information indicating a divided section obtained by dividing a power transmission section of a transmission line at a power plant or substation, information defining a section power calculation formula for each section, information indicating a determination threshold set for each section Information specifying a generator to be shut off when an overload condition occurs, information indicating a shutting order, and the like are input. The information input in step A1 is stored in the data storage unit 123.

  The data receiving unit 121 acquires power generation prediction data from the power generation prediction device 103 (step A2). The data reception unit 121 acquires, for example, power generation prediction data indicating the power generation prediction result for the next day from the power generation prediction device 103 and stores it in the data storage unit 123. Acquisition of power generation prediction data is performed once a day, for example. When the power generation prediction data generated by the power generation prediction device 103 is changed, the power generation prediction data after the change is stored in the data storage unit 123 and used in the subsequent processing.

  The data receiving unit 121 acquires the current substation power data of the substation from the remote monitoring control device 101 (step A3). For example, every time a predetermined time elapses, the data reception unit 121 periodically acquires substation power data from the remote monitoring control device 101 and stores it in the data storage unit 123.

  The section power calculation unit 124 calculates the section power of each divided section using the power generation prediction data acquired in step A2 and the substation power data acquired in step A3 (step A4). In step A4, the section power calculation unit 124 calculates section power for each of the divided sections based on, for example, the power generation prediction data for the current day acquired on the previous day and the current substation power data. If there is a generator that is already cut off, the section power calculation unit 124 calculates the section power by excluding the generator.

  The overload determination unit 125 compares the section power of each division calculated in step A4 with the determination threshold value of each division section, and determines whether or not the section power is greater than or equal to the determination threshold value ( Step A5). When there is a divided section where the section power is equal to or greater than the determination threshold, the overload determination unit 125 determines that an overload condition occurs in the divided section. If it is determined that the section power is smaller than the determination threshold value, the process returns to step A3, and the next substation power data is acquired in step A3.

  If it is determined in step A5 that an overload condition will occur, the shutoff request unit 126 sends a shutoff request to the remote monitoring control device 101 and shuts off at least one of the generators connected to the power transmission line (step A6). ). For example, when the current time is the start time of a time zone in which it is determined that an overload condition occurs, the cutoff request unit 126 transmits a cutoff request to the remote monitoring control device 101. By shutting off the generator, the power supplied to the transmission line is reduced, and the occurrence of an overload condition can be avoided in advance. Thereafter, the process returns to step A3, and the next substation power data is acquired in step A3.

  In addition, the circuit breaker (generator) interrupted | blocked according to the said procedure can be restored when it determines with an overload state not occurring even if it restarts the power transmission from the generator to a power transmission line. For example, the break requesting unit 126, after the breaker is cut off, and when it is determined that an overload condition does not occur even when the broken breaker is turned on again, The remote monitoring control device 101 may be requested to re-enter.

  FIG. 11 shows a procedure for restoring the circuit breaker. The section power calculation unit 124 determines whether there is a generator that is shut off (step B1). If no generator is shut off, the process returns to step B1. When it is determined that there is a generator that is shut off in Step B1, the section power calculation unit 124 calculates the section power when the generator is restored, that is, the section power when the corresponding circuit breaker is “closed” ( Step B2). In step B2, for example, the section power calculation unit 124 calculates the section power for a divided section in which the generated power of the generator being cut off is included in the section power calculation formula.

  The overload determination unit 125 determines whether or not the section power calculated in step B2 is equal to or less than a recovery threshold value related to the recovery of the generator (step B3). For example, the recovery threshold value is set to a value slightly lower than a determination threshold value used for determining whether or not an overload state occurs. When it is determined in step B3 that the section power is equal to or less than the recovery threshold, the shutdown request unit 126 transmits a recovery request to the remote monitoring control device 101, and “closes the circuit breaker corresponding to the generator that is being shut off. (Step B4). When the circuit breaker is “closed”, power transmission from the generator to the transmission line is resumed.

  If it is determined in step B3 that the section power is larger than the recovery threshold, the process returns to step B1. For example, every time new substation power data is obtained, the section power calculation unit 124 executes Step B2 and updates the calculation result of the section power. By doing in this way, when an overload state is canceled, a generator can be automatically returned to a power transmission system. The return of the interrupted generator to the power transmission system may be manually performed by the operator of the remote monitoring control device 101.

  In the present embodiment, the power transmission line overload detection device 102 acquires the prediction result of the generated power of renewable energy from the power generation prediction device 103. The transmission line overload detection device 102 determines whether or not an overload state occurs for each divided section of the transmission line, using the prediction result of the generated power. In the present embodiment, the prediction result of the generated power of renewable energy is used for determining whether or not an overload condition occurs. By determining whether or not an overload condition occurs using the prediction result, it is possible to detect the occurrence of an overload condition before the actual overload condition occurs. For this reason, even when the generated power of renewable energy increases rapidly, the occurrence of an overload condition can be detected in advance, and a situation such as breakage of a transmission line or power failure can be prevented.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to above-described embodiment, A change and correction are added with respect to the said embodiment in the range which does not deviate from the meaning of this invention. Also included in the present invention.

  In the above embodiment, the program can be stored using various types of non-transitory computer readable media and supplied to the computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media such as flexible disks, magnetic tapes, and hard disks, magneto-optical recording media such as magneto-optical disks, CDs (compact discs), and DVDs (digital versatile disks). And a semiconductor memory such as a mask ROM (read only memory), a PROM (programmable ROM), an EPROM (erasable PROM), a flash ROM, or a RAM (random access memory). Further, the program may be supplied to the computer using various types of temporary computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  For example, a part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

[Appendix 1]
Power generation prediction data acquisition means for acquiring power generation prediction data indicating a prediction result of a power generation amount of a generator that generates power using renewable energy and supplies power to a transmission line connected via a circuit breaker;
Substation power data acquisition means for acquiring substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, section power indicating the amount of power in each divided section for each of a plurality of divided sections in which a transmission section of the transmission line is divided at a connection node of the generator Section power calculation means for calculating data;
An overload detection device comprising: an overload determination unit that compares the section power data with a threshold set for each divided section and determines whether or not an overload condition occurs in each of the divided sections .

[Appendix 2]
The overload detection device according to appendix 1, wherein the power generation prediction data acquisition unit acquires power generation prediction data obtained by predicting a power generation amount on the previous day.

[Appendix 3]
The overload detection device according to attachment 2, wherein the power generation prediction data acquisition unit acquires the power generation prediction data after the change when the prediction of the power generation amount of the generator is changed on the same day.

[Appendix 4]
The section power calculation means is configured to calculate the section power data according to a section power calculation formula defined according to a connection relationship between the substation and the generator with respect to the transmission line. Overload detection device.

[Appendix 5]
The overload detection device according to attachment 4, wherein the section power calculation formula is defined for each power transmission / reception pattern of a substation connected to the transmission line.

[Appendix 6]
Power generation prediction data acquisition means for acquiring power generation prediction data indicating a prediction result of a power generation amount of a generator that generates power using renewable energy and supplies power to a transmission line connected via a circuit breaker;
Substation power data acquisition means for acquiring substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the transmitted / received power data, section power indicating the power amount of each divided section for each of a plurality of divided sections in which the transmission section of the transmission line is divided at the connection node of the generator Section power calculation means for calculating data;
An overload determination means for comparing the section power data with a threshold set for each divided section and determining whether or not an overload condition occurs for each of the divided sections;
A power transmission control device comprising: a circuit breaker control unit that controls the circuit breaker according to a determination result in the overload determination unit.

[Appendix 7]
When the overload determination unit determines that an overload condition occurs, the breaker control unit interrupts a circuit breaker corresponding to at least one of the generators connected to the divided section determined to cause the overload condition. The power transmission control device according to appendix 6, wherein at least one of the generators is separated from the power transmission line.

[Appendix 8]
The power transmission control device according to supplementary note 7, wherein the circuit breaker control means breaks the circuit breaker in an order according to a predetermined priority order.

[Appendix 9]
When the circuit breaker control means determines that an overload condition does not occur after the circuit breaker has been shut off and when the overload determination means is re-inserted, The power transmission control device according to appendix 7 or 8, wherein the circuit breaker that has been interrupted is re-introduced.

[Appendix 10]
The power transmission control device according to any one of supplementary notes 6 to 9, further comprising a power generation prediction device that generates the power generation prediction data.

[Appendix 11]
Predicting the amount of power generated by generators that generate power using renewable energy and supply power to transmission lines connected via circuit breakers,
Obtaining substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data indicating the prediction result of the power generation amount of the generator and the substation power data, each of a plurality of divided sections obtained by dividing the power transmission section of the transmission line at the connection node of the generator , Calculate section power data indicating the power amount of each divided section,
An overload detection method that compares the section power data with a threshold set for each divided section and determines whether or not an overload condition occurs in each of the divided sections.

[Appendix 12]
Predicting the amount of power generated by generators that generate power using renewable energy and supply power to transmission lines connected via circuit breakers,
Obtaining substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data indicating the prediction result of the power generation amount of the generator and the substation power data, each of a plurality of divided sections obtained by dividing the power transmission section of the transmission line at the connection node of the generator , Calculate section power data indicating the power amount of each divided section,
Comparing the section power data and a threshold set for each divided section to determine whether an overload condition occurs for each of the divided sections;
A power transmission control method for controlling the circuit breaker according to a determination result of whether or not the overload state occurs.

[Appendix 13]
On the computer,
Obtain power generation prediction data indicating the prediction result of the power generation amount of the generator that generates power using renewable energy and supplies power to the transmission line connected via the circuit breaker,
Obtaining substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, section power indicating the amount of power in each divided section for each of a plurality of divided sections in which a transmission section of the transmission line is divided at a connection node of the generator Calculate the data,
A program for comparing the section power data with a threshold value set for each divided section and executing a process of determining whether or not an overload condition occurs in each of the divided sections.

[Appendix 14]
On the computer,
Obtain power generation prediction data indicating the prediction result of the power generation amount of the generator that generates power using renewable energy and supplies power to the transmission line connected via the circuit breaker,
Obtaining substation power data including data indicating the amount of transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, section power indicating the amount of power in each divided section for each of a plurality of divided sections in which a transmission section of the transmission line is divided at a connection node of the generator Calculate the data,
Comparing the section power data and a threshold set for each divided section to determine whether an overload condition occurs for each of the divided sections;
The program for performing the process which controls the said circuit breaker according to the determination result whether the said overload state arises.

10: Overload detection device 11: Power generation prediction data acquisition means 12: Substation power data acquisition means 13: Section power calculation means 14: Overload determination means 20: Power transmission control device 21: Breaker control means 101: Remote monitoring control device 102: Transmission line overload detection device 103: Power generation prediction device 104, 141, 142: Substation 105, 151-154: Circuit breaker 121: Data reception unit 122: Data input unit 123: Data storage unit 124: Section power calculation unit 125: Overload determination unit 126: Blocking request unit 161-164: Generator 171, 172: Transmission line

Claims (10)

Power generation prediction data acquisition means for generating power generation prediction data indicating a prediction result of power generation of a generator that generates power using renewable energy and supplies power to a transmission line connected via a circuit breaker;
Substation power data acquisition means for acquiring substation power data including data indicating transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, for each of a plurality of divided sections obtained by dividing the transmission section of the transmission line at the connection node of the generator, section power indicating the power of each divided section is obtained. Section power calculation means for calculating;
An overload detection device comprising: an overload determination unit that compares the section power with a threshold set for each divided section and determines whether or not an overload condition occurs in each of the divided sections.   The overload detection device according to claim 1, wherein the section power calculation unit calculates the section power according to a section power calculation formula defined according to a connection relationship between the substation and the generator with respect to the transmission line.   The overload detection device according to claim 2, wherein the section power calculation formula is defined for each power transmission / reception pattern of a substation connected to the transmission line. Power generation prediction data acquisition means for generating power generation prediction data indicating a prediction result of power generation of a generator that generates power using renewable energy and supplies power to a transmission line connected via a circuit breaker;
Substation power data acquisition means for acquiring substation power data including data indicating transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, for each of a plurality of divided sections obtained by dividing the transmission section of the transmission line at the connection node of the generator, section power indicating the power of each divided section is obtained. Section power calculation means for calculating;
An overload determination means for comparing the section power with a threshold set for each divided section and determining whether or not an overload condition occurs for each of the divided sections;
A power transmission control device comprising: a circuit breaker control unit that controls the circuit breaker according to a determination result in the overload determination unit.   When the overload determination unit determines that an overload condition occurs, the breaker control unit interrupts a circuit breaker corresponding to at least one of the generators connected to the divided section determined to cause the overload condition. The power transmission control device according to claim 4, wherein at least one of the generators is separated from the power transmission line.   The power transmission control device according to claim 5, wherein the breaker control unit breaks the breaker in an order according to a predetermined priority order.   When the circuit breaker control means determines that an overload condition does not occur after the circuit breaker has been shut off and when the overload determination means is re-inserted, The power transmission control device according to claim 5 or 6, wherein the interrupted circuit breaker is reintroduced.   The power transmission control device according to claim 4, further comprising a power generation prediction device that generates the power generation prediction data. Predict the power generated by generators that generate power using renewable energy and supply power to transmission lines connected via circuit breakers,
Obtaining substation power data including data indicating transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data indicating the prediction result of the generated power of the generator and the substation power data, for each of a plurality of divided sections in which the transmission section of the transmission line is divided at the connection node of the generator, Calculate the section power indicating the power of each divided section,
An overload detection method that compares the section power with a threshold set for each divided section and determines whether or not an overload condition occurs in each of the divided sections. On the computer,
Obtain power generation prediction data indicating the prediction result of the generated power of the generator that generates power using renewable energy and supplies power to the transmission line connected via the circuit breaker,
Obtaining substation power data including data indicating transmission power supplied from the substation to the transmission line;
Based on the power generation prediction data and the substation power data, for each of a plurality of divided sections obtained by dividing the transmission section of the transmission line at the connection node of the generator, section power indicating the power of each divided section is obtained. Calculate
A program for comparing the section power with a threshold set for each divided section and executing a process for determining whether or not an overload condition occurs in each of the divided sections.

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