JP6199629B2 - System stabilization device - Google Patents

Description

  Embodiments described herein relate generally to a system stabilizing device applied to a digital relay.

  The system stabilization device is a device that prevents a power system instability phenomenon by outputting a predetermined electric control command when an assumed accident occurs. In particular, the online pre-computation system stabilization system performs system analysis simulations on pre-set accident cases, and prepares the control targets in advance in the event of an accident that may cause instability. It is what you choose.

  Such an online pre-computation system stabilization device improves system stability by performing online system information collection, system data storage, analysis system model creation, and system analysis simulation calculations. A calculation unit for determining is provided. In the on-line pre-calculation type system stabilization device provided with the above components, the collection unit first collects on-line system information at regular intervals. Online system information includes power system on / off information (open / close status of circuit breakers, disconnectors, etc.), power supply and demand status (generator output and load, transmission line active and reactive power, bus voltage at each power station) It is information about.

  In general, the creation unit creates an analysis system model representing the current power flow state using online system information collected by the collection unit and system data stored in advance in the storage unit. Subsequently, the calculation unit performs system analysis simulation calculation using the system model for analysis. And a calculation part determines the stability of an electric power grid | system using a system analysis simulation calculation result.

  For example, multiple analysis conditions are set using a plurality of presumed accident type data stored in advance, and transient stability is calculated according to each set analysis condition to determine the stability of the power system for each analysis condition. To do. Furthermore, the determination unit sets a control generator necessary for maintaining the stability of the power system as a control table according to the determined stability.

  As described above, in the online pre-computation system stabilization device, the system control simulation is performed using the system model for analysis, so that the power control target necessary for maintaining the stability of the power system can be changed before the accident occurs. Decide it. Therefore, when an assumed accident occurs, a predetermined power control command can be output quickly to prevent instability of the power system, and the instability does not spread throughout the system. It is possible to maintain stable operation.

  The system stabilizing device that performs the above function is an indispensable device in the power system, and its application range is expanding. Specifically, a system stabilizing device, that is, a digital relay type system stabilizing device characterized by being mounted on a digital relay is known (Patent Document 1).

JP 2011-61911 A

  In the on-line pre-computation system stabilization device, system data is required when creating an analysis system model. The system data includes system capacity and frequency, branch data such as transmission lines and transformers, node (bus) data, generator constant data, load characteristic data, accident sequence data, generator control system data, and the like. Accident sequence data specifies the occurrence of events in the system analysis simulation in time series, and events that occur between the start and end of the simulation plan, that is, the accident point, accident aspect, and accident continuity of the system accident. This data indicates the time, the response of the accident elimination relay, etc. together with the time of occurrence. The generator control system data is data such as an automatic voltage regulator (AVR), a speed governor (GOV), and an auxiliary excitation device (PSS) for stabilizing the system.

  The specific configuration of the system data will be described by taking the IEEJ EAST 10 machine system model as an example. 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 model is 47 nodes (buses), 100 branches (transmission lines and transformers), 10 generators, 1 load characteristic model, and generator control system models. There are three.

  Although these system data are medium in scale, the number of items to be set is still about 4000. In an actual system, since a larger scale system is targeted, the number of items of system data increases, and the number of items of system data handled by the online pre-calculation system stabilization device becomes enormous.

  When such system data is operated, maintenance such as data change, addition or deletion may be performed. Therefore, in the online pre-calculation type system stabilization device, system data is made into a database, a computer system is adopted, and system data maintenance is performed.

  Generally, a workstation equipped with an external storage device (for example, a hard disk drive) having a large-capacity memory is used for a computer system employed in an online pre-calculation type system stabilization device. Therefore, there is no problem in terms of resources regarding the implementation of the database and application and the maintenance of large-scale system data using the database and application.

  However, in the case of the digital relay type system stabilizing device, since the digital relay is a microcomputer-based device, an external storage device having a large capacity memory is not mounted. The digital relay has a settling function as a function for setting the operation determination threshold value of the relay element and the maintenance, and a non-volatile storage unit is used to realize this function. The non-volatile storage unit is severely limited in capacity, and cannot store large-scale system data.

  Therefore, it is conceivable to mount an external storage device having a large-capacity memory even in a digital relay type system stabilizing device. However, when an external storage device is mounted on the digital relay, the external storage device has a drive portion such as a hard disk drive, and therefore, it is required to periodically maintain and maintain the device.

  However, since the use period of digital relays is as long as 15 to 20 years, the application of equipment having a drive part such as a hard disk drive is not familiar with the design concept of digital relays from the viewpoint of reliability and maintainability. . Therefore, in the digital relay type on-line pre-operation type system stabilizing device, the function of the system stabilizing device has to be realized with an internal memory having a limited capacity. In other words, the resources of the digital relay type online pre-calculation system stabilization device are limited, and it is difficult to store large-scale system data.

  Even if an external storage device is installed in the digital relay system stabilization system and the capacity problem for storing system data is solved, the maintenance work of thousands of system data Must be implemented. For this reason, a great deal of labor is involved in the maintenance of system data. Therefore, in the system stabilization device, it has been strongly desired to improve work efficiency with respect to maintenance of system data.

  Embodiments of the present invention have been proposed in order to solve the above-described problems, and the purpose thereof is to realize implementation and maintenance of system data with limited resources, and excellent maintainability. It is another object of the present invention to provide a system stabilizing device that maintains reliability and improves the efficiency of maintenance work.

In order to achieve the above object, an embodiment of the present invention includes a collection unit that collects online system information, a system data storage unit that stores basic system data, and an analysis using the online system information and the basic system data. Control unit required to determine the system stability of the assumed accident case and maintain the stability of the power system by performing the simulation calculation for system analysis using the creation part that creates the system model for power generation and the system model for analysis In the digital relay type system stabilizing device provided with a calculation unit for determining the above, the following (a) to (c) are provided.

(A) It has a settling input part which inputs the maintenance information of the basic system data.
(B) The maintenance information is information set corresponding to the basic system data, and includes data designation information for designating the basic system data and change content information indicating maintenance contents for the basic system data. .
(C) The creation unit
The basic system data is read from the system data storage unit, the maintenance information is read from the settling input unit, and the basic system data is expanded on a random access memory to reflect the maintenance information on the basic system data. A maintenance information reflection unit that creates maintenance-completed data;
Reading the maintenance data from the maintenance information reflection unit and the online system information from the collection unit, and reflecting the online system information to the maintained data developed on a random access memory, the analysis system And an on-line system information reflecting unit for creating a model.

The block diagram of 1st Embodiment. The figure for demonstrating the data structure of basic system | strain data. Explanatory drawing at the time of changing basic system | strain data in 1st Embodiment. The block diagram of 2nd Embodiment. Explanatory drawing at the time of adding and deleting basic system | strain data in 2nd Embodiment. The block diagram of 3rd Embodiment. The figure for demonstrating the consistency check of maintenance information in 3rd Embodiment (when branch data is undefined). The figure for demonstrating the consistency check of maintenance information in 3rd Embodiment (when the connection node of branch data is undefined). The block diagram of 4th Embodiment.

Hereinafter, an embodiment of a system stabilizing device according to the present invention will be described with reference to the drawings.
(1) First Embodiment [Configuration]
With reference to FIGS. 1 to 3, a system stabilizing apparatus according to the first embodiment will be described. A system stabilization apparatus 1 shown in FIG. 1 is a digital relay type online pre-computation system stabilization apparatus.

(Configuration overview)
The system stabilization device 1 includes a system data storage unit 2, a settling input unit 3, an online system information collection unit 4, an analysis system model creation unit 5, and a system analysis simulation calculation unit 6. The analysis system model E creation unit 5 includes a system data change unit 5a, which is a maintenance information reflection unit, and an online system information reflection unit 5b.

(System data storage)
The system data storage unit 2 is a non-volatile storage unit that stores the program data of the apparatus, and has a read-only memory (hereinafter referred to as ROM), as shown in FIG. System data A is stored. The ROM cannot rewrite data like a random access memory (hereinafter referred to as RAM), but has a large memory capacity and is suitable for storing the basic system data A in the digital relay.

(Basic system data)
The basic system data A is basic data when the analysis system model creation unit 5 creates the analysis system model E. For example, the basic system data A shown in FIG. 2 includes nodes (buses), branches (transmission lines and transformers), generator constants, generator control systems, induction machine characteristics, load characteristics, accident sequences, and the like. . Among these, the branch is composed of branch 1 to branch n, and a start node, a terminal node, and an impedance are set in each branch. In the period of use of the system stabilizing device for 15 to 20 years, a change in the system configuration causes a change in transmission line impedance, a change in the generator control system constant, and the like. Therefore, these maintenance mechanisms are essential for operation.

(Settling input section)
The settling input unit 3 inputs maintenance information B to be reflected in the basic system data A from the outside. The settling input unit 3 has a read-only memory (Electrically Erasable Programmable Read Only Memory, hereinafter referred to as EEPROM) that can be electrically erased and written, and stores maintenance information B input from the outside.

(Maintenance information)
The maintenance information B is information set corresponding to the basic system data A, and data specification information for specifying desired data from the basic system data A, and change contents indicating maintenance contents for the specified data. Information. The data designation information includes, for example, data type, data serial number, data item, and the like. The system data changing unit 5a in the first embodiment performs data operation limited to data change. Therefore, the change content information of the maintenance information B indicates the data change content.

(Online system information collection department)
The online system information collection unit 4 collects the online system information C at regular intervals. As described above, the online system information C includes on / off information of the power system (opening / closing state of the circuit breaker, disconnector, etc.), power supply / demand status (generator output and load, transmission line active and reactive power, This is information on the bus voltage of the electric station.

(System model creation part for analysis)
The analysis system model creation unit 5 includes a system data change unit 5a and an on-line system information reflection unit 5b. As described above, the system data changing unit 5a changes data as a data operation.

  The system data changing unit 5a reads the basic system data A from the system data storage unit 2 and the maintenance information B from the settling input unit 3, and creates the changed data D by reflecting the maintenance information B to the basic system data A. To do. The changed data D is maintenance-completed data.

  The online system information reflecting unit 5b reads the changed data D from the system data changing unit 5a and the online system information C from the online system information collecting unit 4, and reflects the online system information C in the changed data D for analysis. A system model E is created.

(System Analysis Simulation Calculation Department)
The system analysis simulation calculation unit 6 performs a system analysis simulation calculation using the analysis system model E created by the on-line system information reflection unit 5b of the analysis system model creation unit 5 to perform screening of assumed accident cases, When an unstable phenomenon occurs, the stability of the power system with respect to the unstable phenomenon is determined, and a control target necessary for maintaining the stability of the power system is determined.

[Action]
Subsequently, a case where a data operation of changing the basic grid data A stored in the grid data storage unit 2 when the power grid equipment change occurs will be specifically described with reference to FIG. FIG. 3 shows an example in which the setting value of the impedance of the branch m is changed from Zm to Zm1. Note that the same applies to changes in other basic system data A such as nodes, generator constants, and the like, and a description thereof will be omitted here.

  First, the settling input unit 3 inputs maintenance information B indicating the change contents of the basic system data A from the outside, and stores the maintenance information B in the EEPROM. Maintenance information B includes, as data specification information to be changed, a branch that is a data type, m that is a data serial number, and impedance that is a data item to be changed. The set value Zm1 is included.

  Next, the system data changing unit 5a reads the basic system data A from the system data storage unit 2 and the maintenance information B from the settling input unit 3, and decodes the maintenance information B. The system data changing unit 5a reflects the contents of the maintenance information B on the basic system data A and performs the data change shown in FIG.

  The online system information reflecting unit 5b reads the changed data D from the system data changing unit 5a, reads the online system information C from the online system information collecting unit 4, and reflects the online system information C in the changed data D. . As a result, the online system information reflecting unit 5b creates an analysis system model E suitable for the actual system that changes from time to time.

  The system analysis simulation calculation unit 6 performs system analysis simulation calculation using the system model E for analysis, thereby screening the assumed accident case, determines the stability of the power system against the unstable phenomenon, and determines the power system Determine the control target necessary for maintaining stability.

[effect]
According to the first embodiment as described above, when the basic system data A stored in the system data storage unit 2 needs to be changed, the settling input unit 3 performs the setting input of the maintenance information B, and the system data The changing unit 5a creates the changed data D by reflecting the maintenance information B to the basic system data A. Since the maintenance information B is information set to change the basic system data A, the basic system data A can be changed to the changed data D with the minimum necessary setting input by the setting input unit 3. is there.

  Therefore, the maintenance work of the basic system data A can be reduced, and the work efficiency of the data maintenance is improved. Moreover, in the present embodiment, since only the maintenance of data change is performed by the system data changing unit 5a, the maintenance work can be further facilitated.

  The basic system data A includes data that is frequently subject to maintenance, and the maintenance information B is set corresponding to the basic system data A. Therefore, in the first embodiment, frequent maintenance such as changing the set value of the impedance of the branch m and changing the constants of the generator control system can be performed without problems.

(2) Second Embodiment [Configuration]
The second embodiment will be described with reference to FIGS. 4 and 5. As in the first embodiment, the second embodiment is a digital relay type online pre-calculation type system stabilization device. For this reason, portions common to the configuration of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. Below, it demonstrates centering on a different part from 1st Embodiment.

(System data editor)
As shown in FIG. 4, the second embodiment is characterized in that the system data changing unit 5a of the analysis system model creating unit 5 in the first embodiment is replaced with a system data editing unit 5c. The system data editing unit 5c is a maintenance information reflecting unit similar to the system data changing unit 5a, and changes, adds, and deletes the data of the maintenance information B input to the settling input unit 3 to the basic system data A It is reflected in. In the system data editing unit 5c in the second embodiment, the basic system data A is changed, added, and deleted. Accordingly, in the data designation information of the maintenance information B, the data is changed or added, It indicates the type of data operation that is to be deleted.

[Action]
In the second embodiment, when a part of the basic system data A needs to be added or deleted due to the establishment or removal of the power system, the example of adding branch n + 1 and deleting branch m is shown as an example. This will be described with reference to FIG. FIG. 5 shows an example in which maintenance information B <b> 1 and B <b> 2 are input to the settling input unit 3 as the maintenance information B. The same applies to the change, addition or deletion of data other than the branch, and the description thereof is omitted here.

  First, the settling input unit 3 inputs maintenance information B1 and B2 for the basic system data A from the outside, and stores the maintenance information B in the EEPROM. The maintenance information B1 is data addition information of the branch n + 1 shown in FIG. 5, and changes, additions, and deletions as data operations, a data type and a serial number of data, that is, a branch and n + 1, and each data item and its data, that is, a start point The node n, the termination node n + 1, and the impedance Zn + 1. On the other hand, the maintenance information B2 is data deletion information for deleting all data of the branch m. For this reason, in the maintenance information B2, data items and data input can be omitted.

  Next, the system data editing unit 5c reads the basic system data A from the system data storage unit 2 and the maintenance information B1 and B2 from the settling input unit 3, respectively, and decodes the maintenance information B1 and B2. Then, the system data editing unit 5c performs data editing as shown in FIG. 5 by reflecting the contents of the maintenance information B1 and B2 with respect to the basic system data A, and creates the maintenance-completed data D1.

  The online system information reflecting unit 5b reads the maintained data D1 from the system data editing unit 5c, reads the online system information C from the online system information collecting unit 4, and reflects the online system information C in the maintained data D1. . As a result, the online system information reflecting unit 5b creates an analysis system model E suitable for the actual system that changes from time to time.

[effect]
According to the second embodiment as described above, in addition to the effects of the first embodiment, there are the following unique effects. That is, in the second embodiment, when it is necessary to add and delete the basic system data A stored in the system data storage unit 2, the basic system data is obtained by performing the minimum settling input for the addition and deletion contents. A can be maintained. Further, the second embodiment can cope with not only a data operation of changing the basic system data A but also a data operation of addition or deletion. Therefore, the maintenance of the basic system data A can be performed more flexibly than in the first embodiment.

(3) Third Embodiment [Configuration]
A third embodiment will be described with reference to FIGS. 6 and 7. Similarly to the second embodiment, the third embodiment is a digital relay-type online pre-calculation type system stabilizing device, and therefore, the same reference numerals are given to parts common to the configuration of the second embodiment. A duplicate description will be omitted. Below, it demonstrates centering on a different part from 2nd Embodiment. As shown in FIG. 6, the third embodiment is characterized in that a system data check unit 9 and a display unit 10 are added to the second embodiment described above.

(System data check part)
Based on a predetermined criterion, the system data check unit 9 determines whether the consistency between the predetermined basic system data A and the maintenance information B is good or bad, and whether the maintained data D1 output from the system data editing unit 5c is good. Or it is the part which checks for defects. When the system data check unit 9 determines that the consistency between the basic system data A and the maintenance information B or the maintenance-completed data D1 is defective data, the system data check unit 9 outputs display information G of the defective data to the display unit 10 and A lock command F for locking the calculation is output to the analysis simulation calculation unit 6.

(Display section)
The display unit 10 displays the contents checked by the system data check unit 9. When the display data G of the defect data is received from the system data check unit 9, the display unit 10 performs the defect display indicating the defect detection contents and the defect part. It is.

[Action]
FIG. 7 shows an example in which maintenance information B3 and B4 are input to the settling input unit 3 as the maintenance information B, and an example in which there is no target that reflects the maintenance information B3 in the basic system data A is shown. The maintenance information B3 is information for changing the impedance to Zx for the branch x, but in the basic system data A, the branch x is undefined. For this reason, even if the system data editing unit 5 c attempts to reflect the maintenance information B to the basic system data A, it is not possible to reflect the change contents in the maintenance information B to the basic system data A.

  At this time, the system data check unit 9 determines that the maintained data D1 output from the system data editing unit 5c is defective data, and outputs display information G of the defective data to the display unit 10. Therefore, the display unit 10 displays that the maintained data D1 is defective data and a defective part.

  Further, the system data check unit 9 outputs a calculation lock command F to the system analysis simulation calculation unit 6, and the systematic analysis simulation calculation unit 6 locks the systematic analysis simulation calculation. Note that the system analysis simulation calculation unit 6 may lock the capture of the analysis system model E as input information instead of locking the calculation. Such system data check unit 9 also performs consistency check when adding and deleting data to basic system data A. In the case of addition, there is no duplication of data, and in the case of deletion Checks whether the data is already defined.

  FIG. 8 shows an example in which the system data editing unit 5c reflects the maintenance information B4 with respect to the basic system data A, resulting in inconsistency in the system data (the state where there is no branch connection destination). The terminal node α of the branch n reflecting the maintenance information B4 is undefined as node data. Therefore, as a result of the system data editing unit 5c reflecting the maintenance information B4 to the basic system data A, the basic system data A becomes data including defects as the system data.

  At this time, the system data check unit 9 checks whether the connection end node specified at the start and end of the branch data is defined as node data. If the terminal node α of the branch n is not defined as node data, the system data check unit 9 determines that the maintained data D1 output from the system data editing unit 5c is defective data, and displays defective data. The information G is output to the display unit 10, and the display unit 10 displays the defect detection content and the defective part of the maintained data D1. Further, the system data check unit 9 outputs a calculation lock command F to the system analysis simulation calculation unit 6, and the system analysis simulation calculation unit 6 locks the system analysis simulation calculation.

[effect]
According to the third embodiment as described above, in addition to the effects of the second embodiment, there are the following unique effects. That is, in the third embodiment, the check unit 9 is added to detect a data mismatch between the basic system data A and the maintenance information B3 input to the system data editing unit 5c, and a defect in the maintained data D1. be able to. As a result, it is possible to prevent the system analysis simulation calculation unit 6 from executing the calculation by the erroneous analysis system model E in advance. Moreover, since the display part 10 displays the defect content of the maintenance-completed data D1, it becomes easy to specify and correct the defective part of the maintenance information B3.

(4) Fourth Embodiment [Configuration]
A fourth embodiment will be described with reference to FIG. As in the first to third embodiments, the fourth embodiment is a digital relay online pre-computation type system stabilization device. Therefore, the same reference numerals are given to portions common to the configurations of the first to third embodiments, and duplicate descriptions are omitted. Below, it demonstrates centering on a different part from the 1st-3rd embodiment.

  As shown in FIG. 9, the fourth embodiment has a structural feature in that a data sucking unit 11 is added to the second embodiment described above. Note that the same effect can be obtained by adding the data sucking unit 11 to the first embodiment and the third embodiment. In addition, as the data extraction unit 11, one that applies a communication function such as serial communication or Ethernet communication is the mainstream.

[Action]
In the fourth embodiment, the data extraction unit 11 can extract the maintenance-completed data D1 reflecting the maintenance information B from the system stabilizing device 1. The data sucking unit 11 can transmit to a control room or the like using a communication function. As a result, it is possible to check that the maintenance of the basic system data A is correctly performed even in a remote control room or the like.

[effect]
According to the fourth embodiment, in addition to the effects of the first to third embodiments, the system analysis simulation can be more reliably performed using the analysis system model E that is properly maintained. It has a unique effect that reliability is further improved.

(5) Other Embodiments The above-described embodiment is presented as an example in the present specification, and is not intended to limit the scope of the invention, and may be implemented in various other forms. Is possible. Various omissions, replacements, and changes may 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 in the same manner as included in the scope and gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... System | strain stabilization apparatus 2 ... System | strain data storage part 3 ... Settling input part 4 ... Online system | strain information collection part 5 ... System model creation part 5a for analysis | analysis System | strain data change part 5b ... Online system | strain information reflection part 5c ... System | strain data edit Unit 6 ... System analysis simulation calculation unit 9 ... System data check unit 10 ... Display unit 11 ... Data extraction unit A ... Basic system data B, B1-B4 ... Maintenance information C ... Online system information D ... Changed data D1 ... Maintenance completed Data E ... Analytical system model F ... Lock command G ... Display information of defective data

Claims (5)

A collection unit that collects online system information, a system data storage unit that stores basic system data, a creation unit that creates a system model for analysis using the online system information and the basic system data, and the system model for analysis The system stability of the digital relay type equipped with a calculation unit that determines the system stability of the assumed accident case and determines the control target necessary to maintain the stability of the power system by performing simulation calculation for system analysis using In the device
A settling input unit for inputting maintenance information of the basic system data;
The maintenance information is information set corresponding to the basic system data, and includes data designation information that specifies the basic system data, and change content information that indicates maintenance contents for the basic system data,
The creating unit
The basic system data is read from the system data storage unit, the maintenance information is read from the settling input unit, and the basic system data is expanded on a random access memory to reflect the maintenance information on the basic system data. A maintenance information reflection unit that creates maintenance-completed data;
The maintenance information reflecting unit reads the maintained data and the online system information from the collection unit, and reflects the online system information to the maintained data developed on a random access memory to analyze the analysis system An on-line system information reflection unit for creating a model. The maintenance information, as contents of maintenance in the change information, the basic change of the system data, system stabilizer of claim 1, characterized in that it comprises an additional or deleted.   The system stabilization apparatus according to claim 1, further comprising a check unit that checks data consistency between the basic system data and the maintenance information.   The system stabilization apparatus according to claim 3, further comprising a display unit that displays contents checked by the check unit.   The system stabilization apparatus according to claim 1, further comprising a data extraction unit for the maintained data.

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