Setting value management device, and setting value management method

Abstract

To appropriately set a setting value of a short circuit protective relay according to an interconnection situation of a power generation facility in a power system.SOLUTION: A setting value management device is communicably connected with a facility information management device which manages information regarding a power generation facility interconnected with a power system, information regarding a power transmission line or power distribution line constituting the power system, and information regarding a short circuit protective relay provided in the power system as facility information, acquires the latest facility information to be provided from the facility information management device, calculates impedance at a node set at a predetermined part of the power system on the basis of the acquired facility information, generates a short circuit capacity map of the power system on the basis of the calculated impedance, formulates a setting value of the short circuit protective relay on the basis of the short circuit capacity map, and sets the setting value in the short circuit protective relay via a communication network.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a setting value management device and a setting value management method.

Background Art

[0002] Patent Document 1 describes a problem such that when a system change is forcedly implemented in an emergency, the ground fault protection relay may be unnecessarily activated, leading to a decrease in the reliability of the power system, and when implementing a setting change of the protection relay, the person in charge needs to go to the power generation and substation where the protection relay is installed to perform the setting value change operation. To solve such problems, an automatic optimization system for protection relay setting values is proposed. The automatic optimization system automatically calculates the setting values of a plurality of protection relays installed in the power system in response to a system change in the power system, and updates the setting values for the protection relays that require updating.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Synchronous generators in thermal power generation etc. contribute to ensuring the short-circuit capacity of the power system, which is essential for the stable operation of the currently mainstream current control type inverters. In recent years, the introduction of renewable energy (solar power generation, wind power generation) has been progressing, and it is expected to become the main power source from the perspective of carbon neutrality.

[0006] The connection of generators using renewable energy to the power system is made by a power converter rather than a synchronous generator. Therefore, as the introduction of generators using renewable energy progresses, it is assumed that the short-circuit capacity of the system will decrease.

[0007] In a short-circuit accident of the power system, a large current flows from the generator towards the accident location according to the short-circuit capacity, and the short-circuit protection relay (such as the over-current relay (OCR) of the substation short-circuit protection relay and the reclosing device of the distribution network) senses the magnitude of the current, and disconnects the accident location from the power system.

[0008] Here, when the short-circuit capacity of the power system is large, a large current flows through the accident location, and the substation short-circuit protection relay shuts off, and the accident location can be disconnected from the power system.

[0009] However, when the short-circuit capacity of the power system becomes small, the short-circuit current becomes small, and the accident location cannot be normally disconnected from the power system.

[0010] In addition, since the short-circuit capacity changes moment by moment depending on the operating status of the power generation equipment and the state of the power system, etc., it is also necessary to update the setting value of the short-circuit protection relay according to the situation.

[0011] In Patent Document 1, when a system change is forced to be carried out at the time of the occurrence of a sudden accident, the setting values of a plurality of protection relays installed in the power system are calculated corresponding to the system configuration of the transmission line after the system change, and the setting values are updated for the protection relays that require updating.

[0012] However, Patent Document 1 does not disclose a mechanism for appropriately setting the setting value of a short-circuit protection relay according to the connection status of a power system of a synchronous generator such as thermal power generation or a power generation facility using renewable energy.

[0013] The present invention has been made in view of such a background, and an object thereof is to provide a setting value management device and a setting value management method capable of appropriately setting the setting value of a short-circuit protection relay according to the connection status of a power generation facility in a power system.

Means for Solving the Problems

[0014] One aspect of the present invention for achieving the above object is a setting value management device, which is configured using an information processing device having a processor and a storage device, and is communicably connected to a facility information management device that manages information on a power generation facility connected to a power system, information on a transmission line or a distribution line constituting the power system, and information on a short-circuit protection relay provided in the power system as facility information, acquires the latest facility information provided from the facility information management device, obtains the impedance at a node set at a predetermined location in the power system based on the acquired facility information, generates a short-circuit capacity map of the power system based on the impedance of the node, determines the setting value of the short-circuit protection relay based on the short-circuit capacity map, and sets the setting value in the short-circuit protection relay by communicating with the short-circuit protection relay.

[0015] In addition, the problems disclosed in the present application and the solutions thereof are clarified by the section of the mode for carrying out the invention and the drawings.

Effects of the Invention

[0016] According to the present invention, the setting value of the short-circuit protection relay can be appropriately set according to the connection status of the power generation facility in the power system.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 4

Figure 5A

Figure 5B

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0018] Hereinafter, an embodiment will be described with reference to the drawings. In the following description, the same or similar configurations may be denoted by common reference numerals and the description thereof may be omitted.

[0019] FIG. 1 shows an example of a power system 1. The exemplified power system 1 includes a transmission network 2, a distribution network 3, and a substation 4. The substation 4 steps up the power supplied from the transmission network 2 and supplies it to the distribution network 3.

[0020] One or more power generation facilities 21a (such as thermal power plants and hydroelectric power plants) and one or more power generation facilities 21b that utilize renewable energy (solar power plants and wind power plants) are connected to the transmission network 2.

[0021] The power generation facility 21a is connected to the transmission network 2 by a synchronous generator. Also, the power generation facility 21b is connected to the transmission network 2 by a power converter.

[0022] The substation 4 is provided with a short-circuit protection relay (hereinafter referred to as "short-circuit protection relay 41").

[0023] Connected to the power distribution network 3 are loads (hereinafter referred to as "customer loads 31") in customers (homes, public facilities, office buildings, various public facilities, factories, infrastructure facilities, etc.).

[0024] One or more short-circuit protection relays (hereinafter referred to as "reclosers 32") are provided at key points of the power distribution network 3.

[0025] The power generation facilities 21a, power generation facilities 21b, substation 4, and recloser 32 are communicably connected via a communication network 5 to a setting value management device 100 which is an information processing device.

[0026] The setting value management device 100 is communicably connected via a communication network 5 to a facility information management device 20 which is an information processing device. The setting value management device 100 and the facility information management device 20 are operated, for example, by an electric power company.

[0027] The communication network 5 is a communication medium for transmitting information (data) by wireless communication or wired communication, and is, for example, a WAN (Wide Area Network), concentrator, 920 Hz band communication network, PLC (Power Line Communication), etc. The communication network 5 may be realized as a whole by a plurality of different communication media according to the purpose of use, etc.

[0028] Each short-circuit protection relay (short-circuit protection relay 41, recloser 32) of the power system 1 can set (update) the setting value by remote control from the setting value management device 100 via the communication network 5.

[0029] Fig. 2 shows the main functions of the setting value management device 100. The setting value management device 100 has functions of a storage unit 110, a facility information acquisition unit 120, an impedance calculation unit 130, a short-circuit capacity map generation unit 135, a setting value determination unit 140, and a setting value update unit 145.

[0030] Among the above functions, the storage unit 110 stores facility information 111, impedance information 112, short-circuit capacity map 113, and setting value information 114.

[0031] The facility information acquisition unit 120 acquires the latest information (hereinafter referred to as "facility information") on various facilities (generators, transformers, transmission lines, distribution lines, loads, short-circuit protection relays, various measuring instruments, etc.) constituting the power system 1 from the facility information management device 200, and manages the acquired facility information as the facility information 111 in the storage unit 110.

[0032] The facility information is, for example, the configuration of various facilities constituting the power system 1, the measured values (voltage value, current value, active power, reactive power, power factor, temperature, etc.) by measuring instruments provided at key points of the power system, and information obtained from the design information and specifications of the facilities (including the operating characteristics of the facilities (trip time characteristics, operating characteristics, etc.), various parameters used for calculating the setting values, etc.). The facility information is used, for example, to obtain the impedance of each node and the setting values of short-circuit protection relays (short-circuit protection relay 41, reclosing relay 32) described later.

[0033] Based on the facility information 111, the impedance calculation unit 130 obtains the impedance of each node (nodal points such as buses on the system, branch points, installation locations of short-circuit protection relays, etc.) set at a predetermined location in the power system 1, and manages the obtained impedance of each node as the impedance information 112. The impedance calculation unit 130 calculates the impedance of each node by, for example, the method described in Non-Patent Document 1 ("Calculation of Short-Circuit Current", Kawamura Electric Industry Co., Ltd., [online], Internet <URL:https: / / www.kawamura.co.jp / catalog / pdf / DB-113.pdf>, searched on November 27, 2023).

[0034] FIG. 3A shows an example of nodes set in the power system 1, and FIG. 3B shows an example of impedance information 112 for each node in FIG. 3A. Note that FIG. 3B shows the impedance information 112 before update by the newly acquired facility information 111, the newly acquired facility information 111 (update information), and the impedance information 112 after update. In this example, the impedance of the transmission line with the facility number "E02" has been updated.

[0035] Returning to FIG. 2, the short-circuit capacity map generation unit 135 obtains the short-circuit capacity for each bus of the power system based on the impedance information 112, generates a short-circuit capacity map, and manages the generated short-circuit capacity map as the short-circuit capacity map 113. The short-circuit capacity map generation unit 135 obtains the short-circuit current (short-circuit capacity) based on the combined impedance seen from the node towards the power source side.

[0036] FIG. 4 shows an example of the short-circuit capacity map 113. The short-circuit capacity map generation unit 135, for example, uses the line voltage at the accident point (fault point) as the reference voltage V (for example, the secondary side rated voltage of the transformer), sets the reference capacity P (for example, the capacity of the transformer), converts the impedance of each facility according to the reference capacity P, and obtains the combined % impedance %Z seen from the node towards the power source side. Then, the short-circuit capacity map generation unit 135, for example, obtains the rated current I from the reference capacity P and the reference voltage V, and obtains the short-circuit current I (short-circuit capacity P s ) from the obtained rated current I.

[0037] Returning to FIG. 2, the setting value determination unit 140 obtains the respective setting values (current values, taps, etc.) of the short-circuit protection relays (short-circuit protection relay 41, reclosing relay 32) based on the short-circuit capacity map 113, and manages the obtained setting values of each short-circuit protection relay as the setting value information 114. The setting value information 114 is managed as a database by a DBMS (Data Base Management System) together with the update history of the content of the impedance information 112.

[0038] The setting value determination unit 140 determines setting values based on, for example, the accident current and the characteristics of the short-circuit protection relay, the protection coordination curve, the time-limited element, the instantaneous element, etc. acquired from the equipment information 111. Note that the setting value determination unit 140 may determine setting values based on the results of simulations of known short-circuit protection relays or the results of actual operation tests, etc. Further, the setting value determination unit 140 may present information necessary for the user to determine setting values to the user via the user interface and determine setting values through interactive processing with the user.

[0039] The setting value update unit 145 identifies the short-circuit protection relay whose setting value has been updated from the setting value information 114, and updates the setting value of the identified short-circuit protection relay by remote control via the communication network 5.

[0040] FIG. 5A shows an example of nodes set in the power system 1, and FIG. 5B shows an example of setting value update (an example of the setting values of each node in FIG. 5A before updating the setting values, an example of the newly determined equipment information 111 (update information), and an example of the setting values of each node after updating the setting values). In this example, the setting values of the reclosing breakers 32 with relay numbers "R20" and "R03" have been updated.

[0041] FIG. 6 shows the main functions of the equipment information management device 200. The equipment information management device 200 includes functions of a storage unit 210, an equipment information management unit 220, and an equipment information providing unit 230.

[0042] Among the above functions, the storage unit 210 stores the equipment information 211.

[0043] The equipment information management unit 220 acquires equipment information from various equipment constituting the power system 1 via the communication network 5, for example, and manages the acquired equipment information as the equipment information 211. Further, the equipment information management unit 220 receives equipment information of various equipment from the user via the user interface, for example, and manages the received equipment information as the equipment information 211.

[0044] The equipment information providing unit 230 provides (transmits) equipment information to the setting value management device 100 via the communication network 5. For example, when the equipment information 211 is updated, the equipment information providing unit 230 provides the update difference to the setting value management device 100.

[0045] FIG. 7 shows an example of the hardware configuration of an information processing apparatus used to implement the setting value management device 100 and the equipment information management device 200. The illustrated information processing apparatus 10 includes a processor 11, a main memory device 12, an auxiliary storage device 13, an input device 14, an output device 15, and a communication device 16. Specific examples of the information processing apparatus 10 include, for example, personal computers, office computers, various server devices, general-purpose machines, and the like.

[0046] All or part of the information processing apparatus 10 may be realized using virtual information processing resources provided using virtualization technologies, process space separation technologies, etc., such as virtual servers provided by a cloud system. The setting value management device 100 and the equipment information management device 200 may be realized using a plurality of information processing apparatuses 10 connected communicably.

[0047] In the same figure, the processor 11 is configured using, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a GPU (Graphics Processing Unit), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), an AI (Artificial Intelligence) chip, or the like.

[0048] The main memory device 12 is a device that stores programs and data, and is, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), a non-volatile memory (NVRAM (Non Volatile RAM)), or the like.

[0049] The auxiliary storage device 13 is, for example, an SSD (Solid State Drive), a hard disk drive, an optical storage device (CD (Compact Disc), DVD (Digital Versatile Disc), etc.), a storage system, an IC card, a reading / writing device for recording media such as an SD card or an optical recording medium, a storage area of a cloud server, etc. Programs and data can be read into the auxiliary storage device 13 via a reading device for a recording medium or a communication device 16. Programs and data stored (memorized) in the auxiliary storage device 13 are read into the main storage device 12 at any time.

[0050] The input device 14 is an interface that receives external inputs, and is, for example, a keyboard, a mouse, a touch panel, a card reader, a pen-input type tablet, a voice input device, etc.

[0051] The output device 15 is an interface that outputs various types of information such as the progress of processing and the results of processing. The output device 15 is, for example, a display device (LCD (Liquid Crystal Display), a graphic card, etc.) that visualizes the above various types of information, a device (voice output device (speaker, etc.)) that vocalizes the above various types of information, a device (printing device, etc.) that converts the above various types of information into characters. Incidentally, for example, the information processing device 10 may be configured to input and output information to and from other devices via the communication device 16.

[0052] The input device 14 and the output device 15 constitute a user interface that receives information from and presents information to the user.

[0053] The communication device 16 is a device that realizes communication (wired communication or wireless communication) with other devices via a communication infrastructure such as the communication network 5, and is configured using, for example, a NIC (Network Interface Card), a wireless communication module, a USB module, etc.

[0054] The information processing apparatus 10 may introduce, for example, an operating system, a file system, a DBMS (DataBase Management System) (relational database, NoSQL, etc.), a KVS (Key-Value Store), etc.

[0055] The functions provided by the setting value management apparatus 100 and the equipment information management apparatus 200 are realized by the processor 11 of the information processing apparatus 10 reading and executing a program stored in the main storage device 12, or by the functions of the hardware (FPGA, ASIC, AI chip, etc.) itself that constitutes the setting value management apparatus 100 and the equipment information management apparatus 200.

[0056] The setting value management apparatus 100 and the equipment information management apparatus 200 store the various types of information (data) described above as, for example, tables in a database or files managed by a file system.

[0057] FIG. 8 is a flowchart for explaining the process (hereinafter referred to as the “setting value update process S800”) performed by the setting value management apparatus 100 when updating setting values. The setting value management apparatus 100 executes the setting value update process S800 when, for example, a timing (the timing when the equipment information 111 is updated, regularly, a pre-scheduled timing, etc.) preset by the user arrives. Hereinafter, the setting value update process S800 will be described with reference to the same figure.

[0058] The equipment information acquisition unit 120 of the setting value management apparatus 100 monitors in real time whether there is a reception of an update difference of equipment information from the equipment information management apparatus 200 (S811: No). When the equipment information acquisition unit 120 receives an update difference from the equipment information management apparatus 200 (S811: Yes), it reflects the content of the received update difference in the equipment information 111 (S812).

[0059] Subsequently, the impedance calculation unit 130 of the setting value management apparatus 100 obtains the impedance of each node based on the updated equipment information 111 and updates the impedance information 112 (S813).

[0060] Subsequently, the short-circuit capacity map generation unit 135 of the setting value management device 100 generates a short-circuit capacity map based on the updated impedance information 112 and updates the short-circuit capacity map 113 (S814).

[0061] Subsequently, the setting value determination unit 140 of the setting value management device 100 determines the setting values of each node and updates the setting value information 114 (S815).

[0062] Subsequently, the setting value update unit 145 of the setting value management device 100 refers to the setting value information 114 and determines whether there is a node for which the setting value needs to be updated (S816). For example, the setting value update unit 145 determines that the setting value needs to be updated when the magnitude of the difference between the values of the setting value of the node before and after the update exceeds a preset threshold value. If the setting value update unit 145 determines that there is no node for which the setting value needs to be updated (S816: No), the process returns to S811.

[0063] On the other hand, if it is determined that there is a node for which the setting value needs to be updated (S816: Yes), the setting value update unit 145 communicates with the node to be updated via the communication network 5 and updates the setting value of the node to be updated (S817). Thereafter, the process returns to S811.

[0064] As described in detail above, according to the setting value management device 100 of the present embodiment, the setting value of the short-circuit protection relay can be appropriately set according to the connection status, operating status of the power generation facilities in the power system 1, the state of the power system, etc. Therefore, even when the short-circuit current decreases, the short-circuit protection relay can be operated to surely disconnect the accident location from the system. For example, even when the introduction of generators using renewable energy progresses, the short-circuit protection relay can be surely operated.

[0065] In addition, since the setting value management device 100 updates the setting value of the short-circuit protection relay via the communication network 5, the setting value of the short-circuit protection relay can be efficiently managed by remote control.

[0066] As described above in detail for the embodiments of the present invention, the above description is for facilitating the understanding of the present invention and is not intended to limit the present invention. The present invention can be changed and improved without departing from its gist, and it goes without saying that equivalents of the present invention are included therein. For example, the above embodiments have been described in detail for easy understanding of the present invention and are not necessarily limited to those having all the configurations described. Also, for a part of the configuration of the above embodiments, addition, deletion, and replacement with other configurations are possible.

Explanation of Signs

[0067] 1 Power system 2 Transmission network 3 Distribution network 4 Substation 21a Power generation facility 21b Power generation facility 100 Setting value management device 110 Storage unit 111 Equipment information 112 Impedance information 113 Short-circuit capacity map 114 Setting value information 120 Equipment information acquisition unit 130 Impedance calculation unit 135 Short-circuit capacity map generation unit 140 Setting value determination unit 145 Setting value update unit 200 Equipment information management device 210 Storage unit 211 Equipment information 220 Equipment information management unit 230 Equipment information providing unit S800 Setting value update process

Claims

1. Composed of an information processing device having a processor and a memory device, communicably connected to a facility information management device that manages, as facility information, information on power generation facilities connected to a power system, information on transmission lines or distribution lines constituting the power system, and information on short-circuit protection relays provided in the power system, acquiring the latest said facility information provided from the facility information management device, obtaining the impedance at a node set at a predetermined location in the power system based on the acquired said facility information, generating a short-circuit capacity map of the power system based on the impedance of the node, formulating a setting value of the short-circuit protection relay based on the short-circuit capacity map, and setting the setting value in the short-circuit protection relay by communicating with the short-circuit protection relay, a setting value management device.

2. The setting value management device according to claim 1, wherein the power generation facility includes a generator connected to the power system by a power converter, a setting value management device.

3. The setting value management device according to claim 2, wherein the generator connected to the power system by a power converter is a generator using renewable energy, a setting value management device.

4. The setting value management device according to claim 1, wherein the short-circuit protection relay is an overcurrent relay of a substation interposed between a transmission network and a distribution network constituting the power system, or a reclosing device provided in the distribution network, a setting value management device.

5. An information processing device having a processor and a memory device performs the steps of communicably connecting to a facility information management device that manages, as facility information, information on power generation facilities connected to a power system, information on transmission lines or distribution lines constituting the power system, and information on short-circuit protection relays provided in the power system, acquiring the latest said facility information provided from the facility information management device, obtaining the impedance at a node set at a predetermined location in the power system based on the acquired said facility information, generating a short-circuit capacity map of the power system based on the impedance of the node, formulating a setting value of the short-circuit protection relay based on the short-circuit capacity map, and setting the setting value in the short-circuit protection relay by communicating with the short-circuit protection relay, a setting value management method.

6. The setting value management method according to claim 5, wherein the power generation facility includes a generator connected to the power system by a power converter, a setting value management method.

7. The setting value management method according to claim 6, wherein the generator connected to the power system by a power converter is a generator using renewable energy, a setting value management method.

8. The setting value management method according to claim 5, wherein the short-circuit protection relay is an overcurrent relay of a substation interposed between a transmission network and a distribution network constituting the power system, or a recloser provided in the distribution network, a setting value management method.

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