JPH03124224A - Power system training simulator - Google Patents

Abstract

PURPOSE:To determine a protective relay, which can function in consideration of the system configuration or the type of fault, in real time by additionally providing a power system training simulator with a protective relay which functions against system fault and a protective relay function judging means which determines a circuit breaker CB according to a predetermined rule. CONSTITUTION:A protective relay priority judging means 61 selects a candidate protective relay, which functions first for a set fault data 65, based on protective relay defining information 66. Upon confirmation that an inhibition set data 68 contains no inhibition set information, a system connection judging means 62 judges whether the relay is connected with a fault point. The system connection judging means 62 judges the connection between the fault point and the relay based on state data 63 of switchgear for simulation system and information 64 for defining system connection and makes a judgement that the function is required if they are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a power system training simulator for simulating a power system in real time to train power system operations under fault conditions.

(Prior Art) If there is no time constraint, the fault current and voltage distribution at the time of an accident can be determined using an electronic computer by fault calculation using the symmetric coordinate method or the like. However, since power system training simulators need to simulate the power system's response in real time, this fault calculation is performed during training to determine the fault current and voltage distribution at the time of an accident, and the protective relays to operate are determined based on this. I couldn't do it.

Therefore, the conventional power system training simulator has a configuration as shown in FIG. 6, and a CB cutoff schedule is registered in advance using the cutoff CB scheduling means 9. During the training, the CB is cut off according to the schedule to avoid grid accidents. The operation of the protective relay at the time of occurrence was simulated. FIG. 7 is an example of a CB cutoff schedule.

(Problem to be solved by the invention) As mentioned above, with the method of registering the CB cutoff schedule in advance and performing a simulation, there is a possibility that an accident may occur. −
There was a problem in that the trainer had to set all the cut-off CDs, and if the system configuration changed during training, it was necessary to reselect the cut-off CBs accordingly. In addition, in the case of re-shutoff due to re-pressurization of the fault point during recovery, the timing of re-pressurization and the system configuration at that time are not known in advance, so it is not possible to register the cut-off CB in advance. There was a problem in that training involving accident situations could not be conducted.

The present invention has been made in view of the above circumstances, and provides a power system training simulator that can effectively conduct training by determining the protective relays to operate in real time in consideration of the system configuration and accident type. It is intended to.

"Structure of the Invention" (Means for Solving the Problems) In order to achieve the above object, the present invention provides a power system training simulator with protective relays and cutoff CBs that operate in response to system faults according to predetermined rules. The structure is such that a protective relay operation determination means for determining the operation is added.

(Function) The protective relay operation determination means checks the grid connection status at the time of the accident based on the set location and type of accident, searches for a protective relay that operates according to predetermined rules, and
Determine the cutoff CB. In this case, the only things that the trainer needs to set in advance are the accident occurrence time, accident point, and accident type. Accident type refers to accident-specific information such as short circuit/ground fault distinction, accident phase, and accident duration.

By increasing the duration of the accident, it is possible to easily simulate repressurization and re-shutoff during restoration.

When recharging at the fault point is detected by the power system simulating means, the protection relay operation determining means is notified, and the protective relay operation determining means determines whether the protective relay will operate again or disconnect it based on the grid connection state at that time. Determine CB. In this case, the timing of repressurization can be automatically detected, and the operation can be determined taking into account the system connection state, making it possible to simulate extremely close to the actual system.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a power system training simulator according to the present invention.

In FIG. 1, reference numeral 1 denotes a power system simulating means that simulates the response of the power system in real time and stores the results in a simulated system data file 2. 3 is a simulated system monitoring and control means that inputs system state quantities from the simulated system data file 2 and displays them on the man-machine device 4 for trainees, and transmits the trainee's operations and control signals via the operation control data file 5. and passes it to the power system simulating means 1.

6 is a protective relay operation determining means that is activated when an accident occurs by the accident generating means 7 or when the electric power system simulating means 1 determines that the fault point has been recharged by the system operation by the simulating system monitoring and controlling means 3; Protective relay or cutoff C that operates
B is determined and notified to the power system simulating means 1. The trainer man-machine device 8 can activate the accident generating means 7 and notify the electric power system simulating means 1 of on-site operation.

FIG. 2 shows an embodiment of the protection relay operation determining means. In FIG. 2, the protective relay operation determining means 6 includes a protective relay priority determining means 61, a grid connection determining means 62, simulated grid switch state data 63, grid connection definition information 64, setting accident data 65, protection relay definition information 66;
It is composed of an operating relay determination result 67 and non-operating setting data 68.

The protection relay priority determining means 61 selects a candidate for the protection relay that should operate first based on the set accident data 65 from the protection relay definition information 66. Furthermore, non-operation setting data 6
After confirming that there is no inoperation setting information in 8, the system connection determining means 62 is made to determine whether the relevant relay is connected to the fault point. The system connection determination means 62 determines the connection between the fault point and the relevant relay from the simulated system switch state data 63 and the system connection definition information 64, and if there is a connection, determines that operation is necessary. Protection relay priority determination means 6
2 has several priority groups, and if one of the higher-ranking groups is set to be inactive, processing of the lower-ranking priority groups is performed. The protective relay operation information whose operation has been determined is output as an operation relay determination result 67 and passed to the power system simulating means 1.

FIG. 3 is an example of protection relay definition information. In this example, ground fault protection relay information for the power transmission line and bus B is stored. In addition to this, similar information will be stored regarding short-circuit protection relay information, transformers, and other equipment. Also,
Although a typical protection relay is shown in FIG. 3, the contents may be changed depending on the protection relay installed in the actual system.

4 and 5 are examples of processing contents of the protection relay priority determining means 61, which correspond to predetermined rules. The rule refers to the priority of protection relays for accidents, such as the main protection relay having a higher priority than the backup protection relay.

In other words, the rear n1(1) protection relay is subject to operation determination only when the main protection relay or its corresponding CB does not operate normally.

The processing contents shown in FIGS. 4 and 5 will be explained step by step below.

FIG. 4 shows an example of processing contents when the accident point is a power transmission line. In step S41, the highest priority is determined, and the main protection relay of the failed power transmission line is selected and its operation is determined. If it is determined in step 342 that the main protection relay and its CB are operating normally, the process ends. If the operation is not normal, step S43 having the next highest priority is executed. S43
Then, the operation of the backup 1st stage relay is determined. If it is further determined in step 844 that the operation is not normal, steps S45 and S46 of the third priority group are executed. In this priority group, accidents cannot be eliminated by bus separation relays, so this priority group is connected in series with the rear 2nd stage relay.

FIG. 5 shows an example of the processing contents when the accident point is the bus bar.

Step S51 is the determination of the highest priority,
The bus protection relay for the accident bus is selected and its operation is determined. If it is determined in step S52 that this priority crew node is operating normally, the process ends. If the operation is not normal, proceed to step S5, which is the process for the next priority group.
3 is executed. S53 is a priority group that includes backup two-stage relays for power transmission lines that can be connected to the faulty bus.

In the above processing example, the number of priority groups was 2 or 3, up to the backup 2-stage relay, but depending on the actual system, other protection relay information may be added to the protection relay 1 definition information, and the processing flow for accidents may be By adding a new priority group to the system, any protection relay simulation can be incorporated, making it possible to perform detailed simulations tailored to the actual system.

[Effects of the Invention] As explained above, according to the present invention, by simply setting accident-specific information such as the accident point, accident type, and accident occurrence time, the grid connection status during training can be checked and the protection system activated. Relays can be accurately determined and simulated in real time. Moreover, this also makes it possible to easily and accurately simulate repressurization and re-shutoff at the time of recovery. As a result, the effectiveness of training for handling accidents can be dramatically increased.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of an embodiment for explaining a power system training simulator according to the present invention, FIG. 2 is a functional block diagram of an embodiment for realizing a protection relay operation determination means, and FIG. 3 is an example of protection relay definition information, FIG. 4 is a flowchart explaining the processing contents when the fault point is a power transmission line, and FIG. 5 is a flowchart 1 to 1 explaining the processing contents when the fault point is a bus bar. FIG. 6 is a block diagram for explaining a conventional training simulator, and FIG. 7 is a diagram illustrating an example of scheduling of cut-off CB that has been conventionally performed. ■...Power system Jti4 simulation means 2...Simulation system data file 3...Simulation system monitoring and control means 4...Man-machine device for trainees 5...Operation control data file 6... Protective relay operation determining means 0 7... Accident generating means 8... Man-machine device for trainer.

Claims (1)

[Claims] Power system training consisting of a power system simulating means for simulating the response of the power system in real time, and a simulated system monitoring and controlling means for displaying the state of the simulated system and transmitting operations by trainees and control signals to the power system simulating means. A power system training simulator characterized in that the simulator is further equipped with a protective relay operation determining means for determining a protective relay and a cutoff CB to operate in response to a set system fault according to predetermined rules.