JP2016063573A - System stabilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an online previous operation type system stabilization system capable of being implemented using a micro computer.SOLUTION: A system stabilization system 1 comprises: a system information collection unit 101 for collecting online system information on a power system; and a micro computer 2 for creating a system model on the basis of a program 11, basic system data 12, and the online system information, performing a system analysis simulation of a postulated accident on the basis of the system model, determining a control target for the postulated accident, and performing control when a system accident has occurred. The micro computer 2 includes a program ROM 4a; the program 11 and the basic system data 12 linked to the program are individually stored in the program ROM 4a.SELECTED DRAWING: Figure 2

Description

  Embodiments of the present invention relate to a system stabilization system, and in particular, with respect to instability caused by an accident in the power system, some controlled devices are disconnected from the power system at high speed or high speed to the power system. The present invention relates to a system stabilization system that stabilizes the unstable phenomenon and maintains stable operation of the power system.

  The online pre-computation system stabilization system is a system that prevents a power system instability from occurring by outputting a control command for a predetermined control object when an assumed accident occurs. System simulation is performed, and the control target is selected in advance in case of a possible accident that may cause an unstable phenomenon. The simulation is performed by creating a system model for analysis.

  The creation of a system model requires basic system data that defines the specifications of the system components and the connections between the components. The basic system data has an enormous number of setting items. For example, the number of setting items ranges from 1000 to 2000 items even in the scale of a standard system model obtained by reducing the Japanese main system. These basic grid data are closely related to grid equipment, and usually a grid equipment database is constructed and data is managed. Therefore, a database engine is applied to handle this database.

  Conventionally, a computer system such as a workstation equipped with an external storage device having a large-capacity memory such as a hard disk has been applied to the online pre-computation type system stabilization system, which is a large scale for the scale of the entire power company level. Systems for scale systems have been put into practical use.

  On the other hand, there is an attempt to realize an on-line pre-operation type system stabilization system using digital relay hardware. Power system protection control devices such as digital relays are important devices that support social infrastructure, and contribute greatly to the stable supply of power. In this case, high reliability and maintainability are required, and it is basically energized for 24 hours during an apparatus usage period of 15 to 20 years, and maintenance such as replacement of consumables is unnecessary. In particular, digital relays ensure high reliability and maintainability by enhancing automatic monitoring functions. In addition, the online pre-computation type control method can automatically perform optimal computations that adapt to the system conditions that change from moment to moment, thus improving control accuracy and saving labor in terms of operation, that is, system operation and facility shutdown. It is possible to save labor in manual setting work according to the situation. From the above, if an online pre-calculation method can be realized by using a protection control device for a power system, in particular, digital relay hardware, there is a great advantage.

  However, since the digital relay is hardware used for the protection control device, it is microcomputer-based hardware to ensure high reliability and maintainability, and no external storage device having a large capacity memory is mounted. . The digital relay has a settling function as a function for setting the operation judgment threshold value of the relay element and the maintenance, and a data rewritable ROM is used to realize this function, but this settling function handles basic system data. Since storage capacity is severely limited and the number of data items is enormous, it is not practical to handle them in the same line as normal settling items. In addition, because it is based on a microcomputer, there are restrictions on processing capacity and memory (RAM) capacity, and it is difficult to implement a system for storing system data and creating a system model using a database and database engine such as a computer system. is there.

  If an external storage device having a large-capacity memory is to be mounted on the digital relay, the choice of the large-capacity memory will be of a type having a drive part such as a hard disk drive. However, the application of a device having a drive part such as a hard disk drive is unfamiliar with the design philosophy of a digital relay because the use period of the digital relay is as long as 15 to 20 years. This is because, when a device having a drive part is applied, periodic maintenance and maintenance of the device are required, and reliability and maintainability, which are advantages of the digital relay hardware, are lost.

  In other words, the realization of an online pre-computation system stabilization system using digital relay hardware is hindered by the limitation of storage capacity, and the reliability and reliability required for digital relays when the storage capacity is increased. It was difficult because it led to a loss of maintainability.

JP 2011-61911 A IEEJ Technical Report No. 801 “Relay Technology for System Step-out / Accident Ripple Prevention”, The Institute of Electrical Engineers of Japan, October 2000, p5-6, p52-57, p61, p74-75 Electric power standard B-402 “Digital type protective relay and protective relay device” Electric Power Industry Federation, April 2008 Electrical Engineering Handbook (6th edition), The Institute of Electrical Engineers of Japan, February 2001 “Next-generation digital relay D4 that reduces the burden on operators”, Toshiba Review Vol. 63, no. 2. February 2008

  Embodiments of the present invention have been proposed in order to solve the above-described problems, and an object thereof is to provide an online pre-calculation type system stabilization system that can be realized using a microcomputer. With the goal.

  In order to achieve the above object, a system stabilization system according to an embodiment is a system stabilization system that stabilizes a power system by performing emergency control according to a system fault in the power system. A system information collection unit that collects information, a system model is created based on the basic system data and the online system information, a system analysis simulation of the assumed accident is performed based on the system model, and the control target for the assumed accident A microcomputer that controls a control target determined in advance in accordance with the occurrence of a system fault, and the microcomputer includes storage means, and links the basic system data to a program, It memorize | stores in the said memory | storage means, It is characterized by the above-mentioned.

It is a block diagram which shows the function structure of the system | strain stabilization system of 1st Embodiment. It is a block diagram which shows the hardware constitutions of the system | strain stabilization system of 1st Embodiment. It is a block diagram which shows the system | strain stabilization system which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the system | strain stabilization system which concerns on 3rd Embodiment. It is a block diagram which shows the structure of the system | strain stabilization system which concerns on 4th Embodiment. It is a block diagram which shows the structure of the system | strain stabilization system which concerns on 5th Embodiment.

(First embodiment)
Hereinafter, the system stabilization system 1 according to the first embodiment will be described in detail with reference to the drawings. As shown in FIG. 1, the system stabilization system 1 performs a system analysis simulation and prepares a control target for stabilization of the power system in advance in preparation for an assumed accident occurring in the power system. This is an online pre-computation type that issues a control command such as a trip signal to a selected control object when an assumed accident occurs.

  This system stabilization system 1 includes a system information collection unit 101, an assumed accident detection unit 102, a system model creation unit 103, a system stabilization calculation unit 104, a control table creation unit 105, a control command output unit 107, Is provided.

  The system information collection unit 101 periodically collects online system information from one or a plurality of external terminals. The online system information indicates the current status such as the connection state of each facility of the power system such as a generator, bus, transformer, power transmission line, or load, and measurement value information of each part of the power system. The connection state of the power system is an open / closed state of a circuit breaker, a disconnector, or the like. The measurement information of each place in the power system includes, for example, a generator output and load, active power and reactive power of a transmission line, and bus voltage of each electric station.

  The system model creation unit 103 performs state estimation calculation and power flow calculation using online system information and basic system data 12 stored in the program ROM 4a as parameters, and creates and stores a system model for analysis representing the current power flow state. . Here, the basic system data 12 includes node data, branch data, generator data, generator control system data, load characteristic data, assumed accident sequence data, and the like. Except accident sequence data, the specifications and specifications of each element constituting the power system are shown. Node data corresponds to generators, buses, loads, etc., and designates each voltage, active power, and reactive power. The branch data is the specifications and specifications of the transmission line and transformer. Assumed accident sequence data specifies the occurrence of events in the system analysis simulation in chronological order, and events that occur between the start of simulation calculation and the end of simulation calculation, that is, the occurrence time of the system fault, the accident point, Specify the accident aspect and duration, the response of the accident elimination relay, etc. along with the time. The generator control system data includes specifications and specifications of an automatic voltage regulator (AVR), a speed governor (GOV), an auxiliary excitation device (PSS) for stabilizing the system, and the like.

  The system stabilization calculation unit 104 performs system analysis simulation calculation using the analysis system model created by the system model creation unit 103. The system stabilization calculation unit 104 sets a plurality of analysis conditions in advance using a plurality of assumed accident type data (assumed accident sequence data) included in the analysis system model, and calculates transient stability according to each analysis condition. And determine whether the power system is stable or unstable for each analysis condition. If it is determined to be unstable here, a combination of control targets is selected by a predetermined method, and the addition of the combination to the assumed accident sequence data is used as a new analysis condition. Determine stable or unstable. If it is further determined that it is unstable, a combination of objects to be controlled whose electric control amount increases is selected, and the calculation is repeated in the same manner. By repeating this series of arithmetic processing until it is determined to be stable, a combination of controlled objects for stabilizing the unstable phenomenon of the system at the time of the assumed accident occurrence is obtained.

  The control table creation unit 105 stores the combination of control targets for system stabilization obtained by the system stabilization calculation unit 104 in association with the assumed accident type in the control table. The assumed accident detection unit 102 refers to the online system information and determines the occurrence of the assumed accident and the type of the assumed accident.

  When the contingency detection unit 102 detects the occurrence of the contingency, the control command output unit 107 reads out the combination of the control objects stored corresponding to the type of the contingency, from the control table, and converts the corresponding control object into power. Disconnect from system. That is, the control command output unit 107 generates a trip signal for the circuit breaker to be controlled, and outputs the trip signal.

  This system stabilization system 1 can be realized by mounting an online pre-calculation type program 11 on the digital relay hardware. As shown in FIG. 2, the digital relay hardware includes an input / output interface and a microcomputer 2. The microcomputer 2 includes a CPU 3, a program ROM 4 a and a RAM 5. The program ROM 4a is non-volatile storage means such as flash memory, and the RAM 5 is volatile storage means such as SRAM. The input / output interface includes an analog input unit 6, an analog / digital conversion unit 7, a digital input / output unit 8 and a transmission circuit 9.

  A program 11 and basic system data 12 are stored in the program ROM 4a. The basic system data 12 is described in a table format, linked with the compile and program 11 and stored in the program ROM 4a.

  The CPU 3 appropriately refers to various electric quantity data of the power system output from the input / output interface and the basic system data 12 of the program ROM 4a, and in accordance with the program 11 of the program ROM 4a, a series of arithmetic processing, that is, system model creation, system stabilization Calculations and control table creation are performed, and trip commands are output to the outside via the digital input / output unit 8 or the transmission circuit 9 while temporarily storing intermediate data during program execution in the RAM 5. Thereby, the microcomputer 2 functions as the system stabilization system 1.

  That is, the system information collection unit 101 is mainly configured by an input / output interface. The assumed accident detection unit 102, the system model creation unit 103, the system stabilization computation unit 104, and the control table creation unit 105 are configured to include a CPU 3 that computes according to the program 11 linked with the basic system data 12. The control command output unit 107 includes the CPU 3 and an input / output interface.

  As described above, the basic system data 12 is linked and stored together with the program 11 in the program ROM 4a, which is an example of a storage unit, so that each configuration of the microcomputer 2 is realized.

  A specific explanation will be given by taking an example of the IEEJ EAST 10-machine model. The Institute of Electrical Engineers of Japan EAST 10 machine system model is a standard system model for the purpose of objectively evaluating new power system analysis tools, system control technology, and the like. The scale of the system data in this system model is 47 nodes, 100 branches, 10 generators, 1 load characteristic model number, and 3 generator control system models.

  Although these system data are small in system scale, the number of items to be set still ranges from about 1000 to 2000. In the actual system, since the system of a larger scale is targeted, the number of items of the basic system data 12 is further increased. Therefore, the data items handled by the online pre-calculation system stabilization system 1 are enormous.

  On the other hand, in this system stabilization system 1, the amount of memory used can be greatly reduced by adopting a system in which the basic system data 12 is described in a table format and linked to the program 11 instead of the system based on the system facility database. . Of the memories mounted on the hardware of the digital relay, the program ROM 4a has a sufficient capacity and is suitable for mounting the basic system data 12. As described above, in the first embodiment, the basic system data 12 is linked to the program 11 and stored in the program ROM 4a.

  This eliminates the need to use a large number of machines, such as cooling fans and hard disks that are prone to failure, and expensive computers with more functions and devices than necessary. Can be implemented. Further, since there is no drive part such as a rotating body, excellent maintainability and reliability can be maintained as in the prior art.

(Second Embodiment)
Hereinafter, the system stabilization system 1 according to the second embodiment will be described in detail with reference to the drawings. In addition, about the same structure or 1st Embodiment as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 3 is a block diagram showing the system stabilization system 1 according to the second embodiment. As shown in FIG. 3, the system stabilization system 1 of this embodiment is mounted on a microcomputer 2 for digital relay, and a ROM is a program ROM 4a that is a first storage means and data that is a second storage means. It is physically provided separately from the ROM 4b. A program 11 is stored in the program ROM 4a, and basic system data 12 is stored in the data ROM 4b.

  According to this system stabilization system 1, the basic system data 12 can be updated only by replacing the data ROM 4b. Therefore, when the basic system data 12 is updated in response to a change in the configuration of the power system, the confirmation range can be limited to the change of the basic form data 12 and the efficiency of the maintenance work is improved. Further, there is a merit in terms of quality control because the program ROM 4a is not changed.

(Third embodiment)
Hereinafter, the system stabilization system 1 according to the third embodiment will be described in detail with reference to the drawings. In addition, about the same structure or the same function as 2nd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 4 is a block diagram illustrating a configuration of the system stabilization system 1 according to the third embodiment. The system stabilization system 1 includes a loading unit 108. The loading unit 108 includes a communication port for connecting a LAN or a serial communication cable and its controller, a connector such as a USB memory and its controller, a reader such as an SD card and its controller, and the CPU 3, and a communication port. The data input via the connector or the reader is written into the data ROM 4b. A USB memory and an SD card are examples of a portable storage medium made of a non-rotating body.

  According to this system stabilization system 1, it becomes possible to write the basic system data 12 to the data ROM 4b from the outside. Therefore, the basic system data 12 can be updated without replacing the data ROM 4b. When the communication line is used, the basic system data 12 can be updated remotely. Therefore, the efficiency of the maintenance work for updating the basic grid data 12 with respect to the configuration change of the power grid is further improved.

  In addition, as a writing destination of the basic system data 12 by the loading unit 108, an empty area of a ROM in which data can be rewritten that stores a set value may be handled as the data ROM 4b.

(Fourth embodiment)
Hereinafter, the system stabilization system 1 according to the fourth embodiment will be described in detail with reference to the drawings. In addition, about the same structure or the same function as 3rd Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 5 is a block diagram showing a configuration of the system stabilization system 1 according to the fourth embodiment. In the data ROM 4b of the system stabilizing system 1, the reference area 4c of the basic system data 12 referred to by the program 11 when creating the system model and the loading area in which the loading unit 108 writes the basic system data 12 for update. 4d is secured. The system stabilizing system 1 further includes a duplicating unit 109 that writes data in the loading area 4d to the reference area 4c. This duplicating unit 109 is mainly configured to include the CPU 3, and when a series of arithmetic processing is not performed, that is, from the time when system model creation, system stabilization computation, and control table creation are completed, until the next computation is started. Within the idle time, the basic system data 12 in the loading area 4d is copied to the reference area 4c.

  According to this system stabilization system 1, it is possible to eliminate the possibility that the basic system data 12 changes from the middle during execution of the program 11, and it is possible to maintain the reliability of the system stabilization calculation.

(Modification)
In the fourth embodiment, the duplication unit 109 may switch between the loading area 4d and the reference area 4c when the basic system data 12 is stored in the loading area 4d. According to this system stabilization system 1, there is no possibility that the program 11 refers to the basic system data 12 being updated, and a system model in which old data and new data are mixed together is created. Reliability can be further improved.

(Fifth embodiment)
Hereinafter, the system stabilization system 1 according to the fifth embodiment will be described in detail with reference to the drawings. In addition, about the same structure or 1st Embodiment as 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 6, the system stabilization system 1 does not store basic system data 12 in a ROM, and includes a system model receiving unit 110 mainly including a CPU 3 and a transmission circuit 9. This system model receiving unit 110 transmits and receives data to and from an external system via a network.

  The external system includes basic system data 12 and a system model creation unit 103, creates a system model, and transmits it to the system stabilization system 1. The system model receiving unit 110 of the system stabilization system 1 receives this system model, and creates a control table through the system stabilization calculation unit 104 and the control table creation unit 105.

  In other words, the system stabilization system 1 does not create a system model by itself but receives and stores the system model from the outside. As a result, the system stabilization system 1 does not need to store the basic system data 12 and does not need to consider the capacity of the ROM. Therefore, the system stabilization system 1 can be easily mounted on the digital relay hardware. In addition, since it is not necessary to update the basic system data 12, the maintenance frequency can be reduced.

(Other embodiments)
As mentioned above, although several embodiment concerning this invention was described in this specification, these embodiment was shown as an example and is not intending limiting the range of invention. A combination of all or any of the embodiments is also included in the scope of the invention. Each embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof as well as included in the scope and gist of the invention.

  For example, data created by the system stabilization system 1 such as a setting table or system model may be output to the outside via the transmission circuit 9, and these data can be checked, and the system stabilization system 1 can be checked. Reliability can be increased.

  In addition, the system stabilization system of the embodiment uses hardware of a digital relay, but the hardware itself may not be used as a protective relay device, and also serves as a protective relay device. Also good. That is, it is not necessary to store the arithmetic program as the protective relay device in the digital relay.

  Even if the hardware of the digital relay is used, it is necessary to measure part of the system information at the local site, or the function of the control command for the local control target can be failed-safe at the output device. The analog input unit 6 and the analog / digital conversion unit 7 can be excluded unless they are implemented as elements.

  Further, the program ROM 4a or the program ROM 4a and the data ROM 4b have been described as an example of the storage means for storing the program 11 and the basic system data 12, but the RAM 5 can be used as a storage destination for the program 11 and the basic system data 12. . When the RAM 5 is used as the storage destination of the program 11 and the basic system data 12, the system stabilization system 1 is provided with a power backup, uninterruptible power supply measures such as a battery corresponding to the characteristics of the volatile memory that loses data when the power is cut off. It is desirable to have the mechanism.

1 System stabilization system 2 Microcomputer 3 CPU
4a Program ROM
4b Data ROM
4c Reference area 4d Loading area 5 RAM
6 Analog input unit 7 Analog / digital conversion unit 8 Digital input / output unit 9 Transmission circuit 11 Program 12 Basic system data 101 System information collection unit 102 Systematic accident detection unit 103 System model creation unit 104 System stabilization calculation unit 105 Control table creation unit 107 control command output unit 108 loading unit 109 duplicating unit 110 system model receiving unit 200 terminal

Claims (9)

A system stabilization system that stabilizes the power system by performing emergency control in response to a system fault in the power system,
A grid information collection unit for collecting online grid information of the power grid,
A system model is created based on the basic system data and the online system information, a system analysis simulation of the assumed accident is performed based on the system model, the control target for the assumed accident is determined in advance, and the system accident A microcomputer that controls the control target determined in advance according to the occurrence of
With
The microcomputer is
Including storage means, linking the basic system data to a program, and storing the data in the storage means;
System stabilization system characterized by The microcomputer is
A system model creation unit that creates the system model using the online system information and the basic system data;
A system stabilization calculation unit that determines a control target for stabilizing the unstable phenomenon by performing the system analysis simulation calculation for each assumed accident using the system model,
A control table creation unit that stores a control target for each assumed accident as a control table based on the result of the system stabilization calculation unit;
An assumed accident detection unit for detecting the occurrence of an assumed accident;
With reference to the control table, a control command output unit that outputs a control command to a control target corresponding to the occurrence of an assumed accident;
Providing
The system stabilization system of Claim 1 characterized by these. The microcomputer and the system information collection unit are provided as hardware of a digital relay,
Storing the basic system data and the program in the hardware of the digital relay;
The system stabilization system of Claim 1 or 2 characterized by these. The storage means is physically divided into a first storage means for storing the program and a second storage means for storing the basic system data,
The system stabilization system according to any one of claims 1 to 3. A communication line connected to be able to perform data communication, comprising a loading unit that receives the basic system data from outside and writes the data to the storage means;
The system stabilization system according to any one of claims 1 to 3. A loading unit connected to a portable storage medium made of a non-rotating body so as to be able to communicate data, reading the basic system data from the portable storage medium, and writing to the storage means;
The system stabilization system according to any one of claims 1 to 3. The storage means
A reference data area referred to by the program;
A loading area for storing data to be replicated in the reference data area;
Have
The loading part is
Write the basic system data received from the outside to the loading area,
The microcomputer is
Having a duplication unit that duplicates the basic system data of the loading area to the reference data area;
The system stabilization system of Claim 5 or 6 characterized by these. The storage means
A reference data area referred to by the program;
A loading area for storing data to be replicated in the reference data area;
Have
The loading part is
Write the basic system data received from the outside to the loading area,
The microcomputer is
A copy unit that switches the loading area to the reference data area and switches the reference data area to the loading area when the basic system data is stored in the loading area;
The system stabilization system of Claim 5 or 6 characterized by these. A system stabilization system that stabilizes the power system by performing emergency control in response to a system fault in the power system,
A grid information collection unit for collecting online grid information of the power grid,
A system analysis simulation of the assumed accident based on the system model, a control target for the assumed accident is determined in advance, and a microcomputer that controls the control target determined in advance according to the occurrence of the system accident,
A receiving unit for receiving data of the system model from outside;
With
The microcomputer is
Performing system analysis simulation based on the system model received by the receiving unit;
System stabilization system characterized by

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