JPS61232481A - Load interruption simulation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a load shedding simulation method for simulating a change in load amount when a load is shedding during simulation in a power supply operation training simulator for a power system.

[Background of the invention]

In recent years, power systems have become larger and more complex, and advanced system operation technology has become necessary. For this reason,
Power supply operators are required to understand the operation of the grid operation automation system, fully understand the characteristics of the grid, and have the ability to take appropriate and prompt measures in the event of an accident. however,
Due to the high reliability of equipment, the number of accidents has been decreasing recently, and it has become difficult to become proficient in dealing with such accidents in actual system operation. Under these circumstances, a power supply operation training simulator that simulates power system response should be used to simulate accidents and develop power supply operators' ability to make quick decisions in the event of a system fault. Is that a very pressing 7′? :It has become a challenge.

FIG. 1 is a system configuration diagram showing the general configuration of a conventionally used power supply operation training simulator. In addition to the computer 11 that executes the main processing in the simulation, the conditions for the simulation are set. It has a data setting device 12 for monitoring and controlling the power system, a system board 13 for monitoring and controlling the electric power system, and an operating vehicle 14 for performing operations for training. , For example, (a) CB [breaker] important data for system configuration, (b) power generation amount of generator, (
c) Set the amount of load, etc., including its time-varying elements, have the computer 11 perform predetermined simulation calculations, calculate the power flow value, frequency, voltage, etc. in the system, and then The information is displayed on the CB and T (display device) 15 of the desk 14, and the trainee is asked to collect detailed information from the relevant electrical station using the telephone 18 based on the displayed information.
Decided on recovery policy, CRT 15, keyboard 16, light pen 19, operator console (opecon) 17
The system allows man-machine interface devices such as these to operate system equipment and adjust power generation and load amounts.

By the way, in such a simulator, recovery training in the case of a hole where load shedding occurs is one of the very important things. The reason for this is that if load shedding actually occurs at t, it will cause great damage to customers.

Therefore, recovery training for load shedding is extremely important, and this load shedding has the following characteristics.

(1) There are multiple load shedding factors.

For example, (a) due to frequency fluctuations (b) due to a change in the system configuration triggered by an accident (C) due to the operator manually shutting off due to fear of the accident spreading (2) due to the cause of the disconnection. The load shedding point and amount of shedding are different.

Well, there are stages in the blocking factor itself. For example, the amount of cutoff may vary depending on the amount of frequency fluctuation.

(3) Multiple interruption factors may occur simultaneously.

(4) Recovery policies vary depending on the cause of the shutdown and the location where the shutdown occurred.

Therefore, in order to effectively train trainees, there is a need for a load simulation method that can sufficiently teach these characteristics of load shedding.

However, in the conventional method, the load amount is calculated in advance according to the change in the state of the power system, and this is used for training. The amount of preparation work required by training instructors was enormous. ``!! Even if the trainee sets a power system state other than the power system state prepared in advance during the t1 training, the simulated load amount will not correspond to this, and as a result, the power system state and the load amount will be different. This caused a problem in that the trainees were not able to perform the exact simulation that they desired.

Furthermore, by understanding not only the load amount after load shedding but also the load shedding status of each feeder, it is possible to perform more appropriate recovery operations, whereas with conventional methods, only the load amount can be understood. It was not possible to carry out more advanced training that corresponded to reality.

In addition, as a document related to such a training simulator, the Power Technology Research Group material of the Institute of Electrical Engineers of Japan rpE-84-1
There is 0J.

[Purpose of the invention]

An object of the present invention is to provide a load shedding simulation method that simplifies training preparation work and allows specific altitude training to be conducted in accordance with the characteristics of actual load shedding, including the wishes of trainees. There is a particular thing.

[Summary of the invention]

The present invention grasps the load on a feeder-by-feeder basis, and sets in advance the feeders to be shut off in the event of a system accident for each type of system accident, and also sets the load ratio of each feeder in advance. Then, when a simulated system accident occurs, a feeder corresponding to the food item is selected, and the load amount after the accident is calculated based on the load ratio of the selected feeder.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on examples. It is assumed that the hardware configuration for executing the simulation is the same as the system shown in FIG.

FIG. 2 is a diagram showing a schematic model of a power system to be simulated, and is composed of a generator 21, a power system circuit network 22, and a load unit 23, where the load unit 23 is a feeder unit 2.
It is further divided into 4-1 to 24-n. This power system model is stored in a storage device in the computer 11 in FIG. 1 in a state that allows simulation to be performed.

FIG. 3 is a flowchart showing a series of steps from the occurrence of load shedding to determining the amount of load shedding, and all of the ratio processing shown here is executed by the computer 11 of FIG.

In Figure 3, 31-1mm is a load shedding factor.
This corresponds to changes in the system configuration due to fluctuations in system frequency or accidents that occur during simulation, or instructions from the power supply operator. Here, for example, 31-1 is a load shedding factor due to a decrease in frequency, and this is defined as 1ipactl. 32 is a feeder management table, which is the tth table for determining which feeder is to be cut off for each factor of load shedding.

FIG. 4 shows an example of a feeder management table when the number of feeders in a load unit is n and the number of load interruption factors is m. In this table 32, p is the load shedding factor.
When act 1 to m occur, the feeder whose load should be cut off is expressed as rOJ, and the feeder that is not load-shedded is expressed as "1".
It is expressed as

33 is a load shedding status table, which is composed of a factor occurrence status table 33A shown in FIG. 5 and a feeder shedding status table 33B shown in FIG. ta6. From these tables 33A and 33B, it is possible to know which load interruption factor (Factl to Factm) is currently occurring, and it is also possible to know which feeder is being interrupted.

Here, if we define the state in which the load shedding factor has occurred as "0", the state shown in Figure 5 is the state in which pactl and pa
This indicates that ct 2 is currently occurring. In this case, feeders 1.2 and n are shut off according to the feeder management table 32 of FIG. This shut-off state corresponds to the contents of the feeder shut-off status table 33B in FIG.

Next, numeral 34 is a feeder load amount table showing the load ratio of each feeder for each load unit, and an example thereof is shown in FIG. The values in this table 34 are set in advance for each feeder, and the sum of the load ratios for feeders 1 to n''1 is 100.

35 is a load unit load amount table in which the load amount for each load unit is set in advance, and an example thereof is shown in FIG. 36 is a load unit actual load amount table, in which the load amount for each load unit when load shedding occurs is calculated and stored here. 37 is a cutoff feeder discrimination processing unit;
If any of factors 31-1 to 31-m occur,
The feeder to be cut off is determined by referring to the feeder management table 32, and the contents of the load cutoff status table 33 are rewritten. Reference numeral 38 denotes an actual load amount calculation processing unit, which calculates the actual load amount on the load unit side from the contents of the rewritten load shedding status table 33, feeder load amount table 34, and load unit load amount table 35.

In this case, the actual load amount is calculated as follows. First, in the load unit load amount table 35, the load amount of the j-th load unit is assumed to be d (FIG. 8). Further, in the feeder load amount table 34, there are n feeders for the j-th load unit, and the load ratio within the i-th feeder is assumed to be f1□ (see FIG. 7). Furthermore, in the feeder cutoff status table 33B, the i-th feeder important condition of the j-th load unit is expressed as 5.1,
S1 = "1" indicates that the feeder is "on", and S = "0" indicates that the feeder is "off".

Also, let pI be the actual load amount of the j-th load unit.

Then, the actual load amount pj can be determined by the following formula.

pI=d1・Σ(S+j−flj) 1 So 1 As a result, for any load shedding, the amount of load shedding can be determined faithfully as in the actual phenomenon, and the feeder status can be determined according to the load shedding status table 33. You can tell by the content.

For example, in load unit number 3, pactl.

2 occurs, the contents of the load shedding status table 33 will be as shown in FIG. 5.6. Therefore, from the values in tables 34.35 in FIGS. 7 and 8, the actual load amount of load unit number 3 is p3 = 700 x 0.7 = 490 (MW).

In the case of recovery operations, it goes without saying that a simulation of returning the load shedding to the original normal state can be easily realized using the above concept.

As described above, according to the present invention, the feeders to be cut off are set in advance for each type of grid fault caused by the load cutoff factor, and when a grid fault occurs, the feeders to be cut off are set in advance according to the type of grid fault. Since the load amount for each load unit is calculated and displayed based on the determination result, it is possible to accurately simulate the altitude in accordance with the actual phenomenon. In addition, since the load amount for each load unit is calculated each time a shutdown factor occurs, there is no need to complete load calculations in advance as in the past, greatly reducing the work of instructors. . Furthermore, by simply modifying the contents of the feeder cutoff status table and the feeder load amount table, the trainee can create any desired system state and freely train in this system state.

[Effects of the Invention] As is clear from the above description, according to the present invention, the preparation work for training of power supply operators for load shedding factors is simplified, and the preparation work for training of power supply operators can be carried out in accordance with the wishes of the trainees. Specific altitude training can be conducted based on the characteristics of actual load shedding.

[Brief explanation of drawings]

Figure 1 is a system configuration diagram of a training simulator, Figure 2 is a diagram showing a schematic model of the power system used in the present invention, and Figure 3 is a diagram showing a schematic model of the power system used in the present invention.
The figure shows an example of the procedure for calculating the actual load amount on the load unit side, and FIGS. 4 to 8 are diagrams showing the contents of the t data table shown in FIG. 3. 31-1 to m...Load shedding factor, 32...Feeder management table, 33...Load shedding status table, 34...Feeder load table, 35...Load unit load amount table, 36... - Load unit actual load table, 37... Interruption feeder discrimination processing section, 38... Actual load amount calculation processing section.

Claims (1)

[Claims] 1. In a simulation system that simulates a power system, the load to be cut off and its load ratio are set for each feeder for each type of grid fault, and when a simulated grid fault occurs, A load shedding simulation method characterized by selecting a corresponding feeder to be cut off, and calculating and displaying a load amount after a system accident occurs based on a load ratio of the selected feeder.