JP2575123B2 - Method of simulating operation of protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention constitutes a power system simulation function software for performing a skill training on system operation of power supply and control personnel of a power system using a training simulator by a computer. The present invention relates to a method for simulating the operation of a main protection device and a rear protection device.

[Conventional technology]

FIG. 3 is a flow chart showing a method of simulating the operation of a conventional protection device. In the figure, ST16 is a block for calculating the fault equivalent impedance of the system when a fault occurs in the system, ST17 is a block for calculating the positive-phase admittance matrix including the fault equivalent impedance, ST18 is a voltage calculation block for the positive-phase circuit, and ST19. Is the block for calculating the fault current of the negative or zero-phase circuit, ST20 is the block for calculating the voltage and current distribution of the negative or zero-phase circuit, ST21 is the block for calculating the voltage and current distribution of the three-phase circuit, and ST22 is the main protection. ST23 is a block to determine the operation of the relay alone, ST24 is a block to update the timer by Δt, ST25 is a block to determine whether or not the relay sequence is established, and ST26 is the corresponding CB. Block, ST
27 is a block for judging the continuation of the failure.

Next, the operation will be described. First, the accident of the power system is 1 Senchi絡, 2 Senchi絡, 2-wire short-circuit, there are 3 Senchi絡(short) or the like, the failure calculated for these accidents, fault the equivalent impedance Z _F of ST16 the block of calculation to calculate a fault equivalent impedance Z _F reversed phase circuit to be added to the fault point of the positive-phase circuit and comprising a zero-phase circuit.

3 Senchi絡(shorted) in becomes a Z _F = 0, 1 line ground is
^{_{Z F = Z F 2 + Z}} F 0, with 2-wire ground fault is The Z _F = Z _F ² is a 2-wire ground fault.

However, Z _F ^2; the calculation of the equivalent impedance of the zero-phase circuit as viewed from the fault point next positive phase admittance matrix containing Z _F of ST17,; equivalent impedance of the reverse-phase circuit as viewed from the fault point Z _F ⁰ Fault equivalent impedance Z _F at the fault point of the positive-phase circuit
Calculate the admittance matrix when adding
The voltage of each node is calculated by solving the equation (1) of the positive phase network by a block for calculating the voltage of each node by solving the equation of the positive phase network.

However, G; generator x _d 'behind the node F; accidents node L; load, general node I; node current Y; admittance matrix V; node voltage Incidentally, the unknowns in equation (1) I _G, I _F and V _L It is.

Expanding equation (1), From equation (3), Substituting equation (4) into equation (2) gives Next, the ST19 to obtain the fault current of a reverse-phase or zero-phase circuit (5) to calculate the fault current of a reverse-phase or zero phase circuit from I _F and Z _F ^2, Z _F ⁰ of subsequently reversed phase or zero The node voltage and branch current of the negative-phase or zero-phase circuit are calculated from the fault current and the admittance matrix of the negative-phase or zero-phase circuit by ST20 for calculating the voltage and current distribution of the phase circuit.

Thereafter, the node voltage and branch current of the positive-phase, reverse-phase, or zero-phase circuit are converted into node voltages and branch currents of the a, b, and c phases by the block for obtaining the voltage and current of the three-phase circuit in ST21.

This completes the calculation of the input voltage and current of the relay.

Next, the voltage and current at the relay installation point are input by a program that simulates the main protection and back-up protection relay alone according to the operation judgment of the main protection and back-up protection relay alone in ST22, and the operation is judged. If there is no operation, the operation is terminated.If there is operation, the timer is updated by Δt in ST24 to determine whether or not the relay operation time limit has been reached, and the relay sequence determination block in ST25 is used. It is determined whether or not the final output of the relay sequence is output.
Branch to update block ST24, if YES, ST26 CB
When the relay is operated by the trip, the CB to be tripped is picked up from the table and the CB is cut off.

Next, it is determined whether still failure or being continued by determining whether or not a failure continuing ST27, branches to block ST16 to calculate again failure equivalent impedance Z _F in If YES, in the case of NO End I do.

[Problems to be solved by the invention]

Since the conventional method of simulating the operation of the protection device is configured as described above, there is a problem in that the calculation time increases as the system scale increases, and the method is unsuitable for a training simulator.

The present invention has been made in order to solve the above-mentioned problems, and a method of simulating the operation of a protection device that can be applied to a training simulator by speeding up the operation simulation of the protection device using a computer. The purpose is to gain.

[Means for solving the problem]

The method of simulating the operation of the protection device according to the present invention is characterized in that, in the training preparation and training execution stages, when a CB (circuit or breaker) is operated from an open state to a closed state, a CB that may lead to a system accident and trip may be generated. The CB registration file is stored in advance in a registration file, and the CB registration file is searched at the time of opening and closing the CB in the training execution stage to automatically determine whether a system accident occurs.

(Operation)

The method of simulating the operation of the protection device according to the present invention is such that the computer and the trainer interactively proceed with the training work via a screen such as a CRT, and the CB registration file created in advance and the CB are opened in the training execution stage. When the closing operation is performed, if the relevant CB and the equipment to which the CB belongs are in the CB registration file, it is determined that a system accident will occur, and the equipment data file is searched, and the Ry for tripping the CB is determined.
Is extracted, and the operation Ry and the trip CB are automatically determined.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an accident setting screen in the training preparation stage, 2 is a program A for judging a CB number belonging to the accident equipment set in the accident setting screen 1 and stored in a CB registration file, and 3 is a program for grounding equipment. An operation screen 4, a program B having the same function as the program A2, a CB operation screen 5, a program C 6 for determining whether or not a system accident occurs when the CB is opened and closed, a CB registration file 7, 8 is a facility data file, 9 is a system monitoring panel, and 10 is a system monitoring screen.

In FIG. 2, ST11 is a block for taking out the equipment name A and CB number A when opening and closing the CB of the grounded equipment.
ST12 is a block for searching the CB registration file for a match with the equipment name A and CB number A. ST13 is a block for judging whether there is a match.
Proceed to T14. The ST searches the equipment data file and extracts Ry A from the table that matches the equipment name A and the CB number A.
ST15 changes CB number A from closed to open, changes Ry A to operating state,
This is a block to transfer to the trainee.

Next, the operation will be described. The trainer works interactively with the computer via the screen. In FIG. 1, first, the trainer prepares a training scenario in the training preparation stage. As one of the items, the accident setting screen 1 uses the light pen to indicate the accident occurrence condition, the accident equipment, the accident type, the accident occurrence time, and the like. Set.

When the accident setting is completed, the program A2 is started, and the name of the equipment for which the accident is set and all the breakers and breakers connected to the equipment are picked up and stored in the CB registration file 7.

 Next, it proceeds to the training execution stage by the trainee.

In Fig. 1, we attach the ground to the suspended transmission line, forget to remove the ground at the end of the work, and try to utilize the transmission line.
A method of simulating the operation of the protection device will be described by taking a case where the CB is closed as an example.

If the trainer is requested to ground the transmission line by a telephone command from the trainee, the trainer sets the grounding using the light pen on the operation screen 3 of the grounding facility.

When the earth is attached to the stopped transmission line, the transmission line end CB
Since the closing operation of the system may lead to a system accident, the program B4 is started, and the name of the grounded transmission line equipment and the CB numbers at both ends are stored in the CB registration file 7.

After that, when the training progresses and the trainee requests to close the CB at one end of the grounded transmission line by telephone command, the trainer closes the CB using the light pen on the operation screen 5 of the CB. With the closing operation, the program C6 is started, and the CB registration file 7 is searched to determine that a system accident has occurred. Then, the equipment data file 8 is searched to select an operating Ry (relay), and the closed CB is operated. At the same time, the data is transferred and displayed on the system monitoring panel 9 on the trainee side, and further displayed on the system monitoring screen 10 of the trainer.

Next, the operation of the program C6 will be described below with reference to the flowchart of FIG.

In FIG. 2, the program C6 first extracts the facility name A of the grounded transmission line and the CB number A of the closed CB in ST11, searches the CB registration file 7 in ST12, and searches for the facility name A, CB number. Look for a match with A. in this case,
Since there is a match, ST13 becomes YES, the equipment data file 8 is searched by ST14, RyA of the Ry part is extracted from the table matching the equipment name A, CB number A, and ST15 is executed.
The state of CB number A is changed from closed to open, the state of Ry A is changed to the operating state, and transferred to the trainee.

〔The invention's effect〕

As described above, according to the present invention, when simulating the operation of the protection device, a CB registration file and an equipment data file are created in advance, and the file is searched at the time of closing the CB, whereby the system is searched. Since the protection process is performed at the time of failure, it is possible to reduce the cost of producing a training simulator program by a computer and to perform the simulation process at a high speed.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a training simulator according to an embodiment of the present invention, FIG. 2 is a flowchart of a program C, and FIG. 3 is a flowchart of a simulation of the operation of a conventional protection device. In the figure, 1 is an accident setting screen, 3 is a ground equipment operation screen, 5 is a CB operation screen, 7 is a CB registration file, 8 is an equipment data file, 9 is a system monitoring panel, and 10 is a system monitoring screen. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57) [Claims] In a method of simulating the operation of a power supply system using a training simulator by a computer, the simulation of an operation of a power system is performed. A facility name and facility-related data applied to the operation simulation are stored in a facility data file in advance. And related to the equipment name applied to the operation simulation.
Create CB data when necessary for training preparation or training execution stage, store it in CB registration file, use the CB registration file,
At the time of CB opening / closing operation during training execution, an input command from the trainer's accident setting screen, ground equipment operation screen and CB operation screen is given to the computer, and the trainer instructs the trainer via the ground equipment operation screen according to the instruction from the trainee. When the required information is input, the computer searches both the facility data file and the CB registration file, simulates the operation of the system protection device, and displays the result on the system monitoring panel on the trainee side. A method for simulating the operation of the protection device.