Distributed power supply system self-healing control method

Abstract

The embodiment of the invention discloses a distributed power supply system self-healing control method. According to the scheme, when the power supply system breaks down, the power distribution terminal configured for the power supply switch at the downstream of the fault point controls the power supply switch connected with the power distribution terminal to be switched off, an isolation success signal is generated, and the isolation success signal is sent to the power distribution terminal configured for each interconnection switch; the power distribution terminal configured for each interconnection switch receives the isolation success signal, and sends power switch characteristic data of the power point switch and interconnection switch characteristic data of the interconnection switch to the power distribution terminal configured for the fault isolation switch, so that the fault isolation switch determines a target interconnection switch capable of realizing an optimal self-healing path; and the serial number of the target interconnection switch is sent to the power distribution terminal configured by each interconnection switch, so that the power distribution terminal configured by the interconnection switch consistent with the serial number of the target interconnection switch controls the interconnection switch connected with the power distribution terminal to be switched on, and power supply of a non-fault area of the power supply system is recovered.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electric power technology, and in particular to a self-healing control method for a distributed power supply system. Background Art

[0002] At present, the most commonly used distribution network self-healing system is a centralized grid structure, but with the popularization of intelligence and the penetration of distributed power sources, energy storage systems and microgrids, the distribution network self-healing system is gradually transitioning to a distributed grid structure. As a result, the original control method of the distribution network self-healing system has also changed from centralized control and local control to intelligent distributed control.

[0003] However, the current traditional power supply recovery in non-fault areas is judged only by the single-side voltage loss of the tie switch. For scenarios with multiple tie switches, it is impossible to select the optimal tie switch for self-healing. Summary of the invention

[0004] An embodiment of the present invention provides a distributed power supply system self-healing control method, which can realize the selection of an optimal self-healing path.

[0005] An embodiment of the present invention provides a self-healing control method for a distributed power supply system, wherein the power supply system comprises a plurality of power switches, a plurality of power point switches and a plurality of tie switches; each of the power switches, each of the power point switches and each of the tie switches is equipped with a power distribution terminal;

[0006] The distributed power supply system self-healing control method comprises:

[0007] When the power supply system operates normally, the power distribution terminal configured with each power point switch sends the power switch characteristic data of the power point switch connected to it to the power distribution terminal configured with at least one tie switch;

[0008] When a fault occurs in the power supply system, the power distribution terminal configured for the power supply switch downstream of the fault point controls the power supply switch connected thereto to open, and the power supply switch that performs the opening is defined as a fault isolation switch. After the fault isolation switch opens successfully, an isolation success signal is generated, and the isolation success signal is sent to the power distribution terminal configured for each of the tie switches;

[0009] The power distribution terminal configured with each of the tie switches receives the isolation success signal, and sends the power switch characteristic data of the power point switch and the tie switch characteristic data of the tie switch to the power distribution terminal configured with the fault isolation switch;

[0010] The power distribution terminal configured with the fault isolation switch determines the target tie switch according to the power switch characteristic data and the tie switch characteristic data, and sends the number of the target tie switch to the power distribution terminal configured with each tie switch;

[0011] The power distribution terminal configured with the tie switch having the same number as the target tie switch controls the connected tie switch to close, so as to restore power supply to the non-fault area of ​​the power supply system.

[0012] Optionally, before the power distribution terminal configured for the power switch downstream of the fault point controls the power switch connected thereto to open, the method further includes:

[0013] Each of the power distribution terminals monitors the current data of the power switch connected thereto;

[0014] The power distribution terminal that monitors the abnormal current data sends the switch fault information;

[0015] Each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point based on its own sending information and receiving information.

[0016] Optionally, each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point according to its own sending information and receiving information, including:

[0017] If the power distribution terminal sends the switch fault information, receives the switch fault information sent by the upstream adjacent power distribution terminal, and does not receive the switch fault information sent by the downstream adjacent power distribution terminal, then the power distribution terminal is the power distribution terminal upstream of the fault point;

[0018] If the distribution terminal does not send the switch fault information, receives the switch fault information sent by the upstream adjacent distribution terminal, and does not receive the switch fault information sent by the downstream adjacent distribution terminal, then the distribution terminal is the distribution terminal downstream of the fault point.

[0019] Optionally, after each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point according to its own sending information and receiving information, the method further includes:

[0020] The power distribution terminal upstream of the fault point controls the power supply switch connected thereto to open;

[0021] The power distribution terminal downstream of the fault point records the real-time load of the fault isolation switch connected thereto 1 second before the fault.

[0022] Optionally, the power switch characteristic data includes power point switch properties, power point switch capacity, and power point switch real-time load;

[0023] The tie switch characteristic data includes the number of opening and closing actions, control circuit status, energy storage status and number.

[0024] Optionally, the power distribution terminal configured for the fault isolation switch determines the target tie switch according to the power switch characteristic data and the tie switch characteristic data, including:

[0025] Determine a screening strategy according to the power point switch property of each power point switch; the screening strategy includes a first screening strategy and a second screening strategy;

[0026] The target tie switch is determined according to the first screening strategy or the second screening strategy.

[0027] Optionally, the power point switch properties include distributed power switches and conventional power switches;

[0028] The step of determining a screening strategy according to the power point switch property of each power point switch comprises:

[0029] If the power point switch property of the power point switch is a distributed power switch, the screening strategy is a first screening strategy;

[0030] If the power point switch property of the power point switch is a conventional power switch, the screening strategy is a second screening strategy.

[0031] Optionally, determining the target tie switch according to the first screening strategy includes:

[0032] Select the tie switch closest to the power point switch whose property is a distributed power switch;

[0033] The tie switch that is closest to the power point switch whose property is a distributed power switch is the target tie switch.

[0034] Optionally, determining the target tie switch according to the second screening strategy includes:

[0035] Determining the operating state of each of the tie switches according to the control loop state and the energy storage state of each of the tie switches;

[0036] According to the operating state of each of the tie switches, obtaining a first tie switch to be screened;

[0037] Select the second tie switches to be selected according to the load to be transferred and the power point switch capacity of the power point switch closest to each of the first tie switches to be selected and the real-time load of the power point switch;

[0038] The target tie switch is determined according to the number of opening and closing actions of the second tie switch to be screened.

[0039] Optionally, before the power supply system is operated, the method further includes:

[0040] According to the topological structure and lightweight communication protocol of the power supply system, an information interaction mechanism is established between adjacent power distribution terminals;

[0041] Wherein, the lightweight communication protocol includes a message queue telemetry transmission protocol;

[0042] The establishing of an information interaction mechanism between adjacent power distribution terminals according to the topological structure of the power supply system and the lightweight communication protocol includes:

[0043] According to the topological structure of the power supply system, the power distribution terminal of the power supply system is set as a client and a comprehensive measurement and control communication unit of a ring main unit adjacent to the substation is set as a server;

[0044] According to the message queue telemetry transmission protocol and the interactive information of the power supply system, the topic and subscription topic of each distribution terminal are configured so that adjacent distribution terminals can publish information through corresponding topics and receive information through corresponding subscription topics.

[0045] In the embodiment of the present invention, when a fault occurs in the power supply system, the distribution terminal configured with the power switch downstream of the fault point controls the power switch connected to it to open, defines the power switch that performs the opening as a fault isolation switch, generates an isolation success signal after the fault isolation switch is opened successfully, and sends the isolation success signal to the distribution terminal configured with each connecting switch; the distribution terminal configured with each connecting switch receives the isolation success signal, sends the power switch characteristic data of the power point switch and the connecting switch characteristic data of the connecting switch to the distribution terminal configured with the fault isolation switch, so that the distribution terminal configured with the fault isolation switch can select the optimal self-healing path according to the power switch characteristic data and the connecting switch characteristic data, determine the target connecting switch, and send the number of the target connecting switch to the distribution terminal configured with each connecting switch, so that the distribution terminal configured with the connecting switch with the same number as the target connecting switch controls the connecting switch connected to it to close, so as to restore power supply to the non-fault area of ​​the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 A schematic diagram of the structure of a distributed power supply system provided by an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of a flow chart of a self-healing control method for a distributed power supply system provided by an embodiment of the present invention;

[0049] Figure 3 A flowchart of steps for establishing an information interaction mechanism between adjacent power distribution terminals provided by an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of a flow chart of another distributed power supply system self-healing control method provided by an embodiment of the present invention;

[0051] Figure 5 A schematic flow chart of a step of determining a target tie switch provided by an embodiment of the present invention;

[0052] Figure 6 A schematic flow chart of a step of determining a serial number of a target tie switch according to a first screening strategy provided by an embodiment of the present invention;

[0053] Figure 7 A schematic flow chart of a step of determining a target tie switch according to a second screening strategy provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] This solution proposes a distributed power supply system self-healing control method, which can achieve the selection of the optimal self-healing path. This embodiment is applicable to the situation where a distributed power supply system fails and needs to self-heal to restore power supply to a non-fault area. The method can be executed by the distributed power supply system.

[0057] Figure 1 A structural diagram of a distributed power supply system provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the power supply system 01 includes a plurality of power switches 10 (101-109), a plurality of power point switches 20 (201-204) and a plurality of connecting switches 30 (301-303); each power switch 10 (101-109), each power point switch 20 (201-204) and each connecting switch 30 (301-303) is configured with a distribution terminal connection.

[0058] Among them, the power point switch 20 (201-204) refers to the switch connected to the substation in the power supply system 01, the connecting switch 30 (301-303) refers to the switch in the open state on the main road of the power system 01, and the power supply switch 10 (101-109) refers to the switch in the closed state on the main road of the power system 01. Each power supply switch 10 (101-109), each power point switch 20 (201-204) and each connecting switch 30 (301-303) are connected to a distribution terminal. Thus, the distribution terminal can control the opening and closing state of the switch connected to it, and obtain information such as the number of opening and closing actions, control loop status, energy storage status and number of the switch connected to it. In addition, the distribution terminals included in the distributed power supply system can exchange information through peer-to-peer communication to achieve the selection of the optimal self-healing path.

[0059] Figure 2 A flow chart of a distributed power supply system self-healing control method provided by an embodiment of the present invention, the distributed power supply system self-healing control method specifically comprises the following steps:

[0060] S110. When the power supply system operates normally, the power distribution terminal configured with each power point switch sends the power switch characteristic data of the power point switch connected thereto to the power distribution terminal configured with at least one tie switch.

[0061] The power switch characteristic data includes data reflecting the power point switch status, such as the power point switch properties, the power point switch capacity, and the power point switch real-time load.

[0062] For example, Figure 1 As shown, when the power distribution system operates normally, the distribution terminal configured with the power point switch 201 sends the power switch characteristic data of the power point switch 201 to the distribution terminal configured with the connecting switch 302 and / or the distribution terminal configured with the connecting switch 301; the distribution terminal configured with the power switch 202 sends the power switch characteristic data of the power switch 202 to the distribution terminal configured with the connecting switch 301; the distribution terminal configured with the power switch 203 sends the power switch characteristic data of the power switch 203 to the distribution terminal configured with the connecting switch 302; the distribution terminal configured with the power switch 204 sends the power switch characteristic data of the power switch 204 to the distribution terminal configured with the connecting switch 303.

[0063] According to the topological structure of the power supply system and the lightweight communication protocol, an information interaction mechanism between adjacent distribution terminals is established.

[0064] S120. When a fault occurs in the power supply system, the distribution terminal configured for the power supply switch downstream of the fault point controls the power supply switch connected to it to open, and the power supply switch that performs the opening is defined as a fault isolation switch. After the fault isolation switch opens successfully, an isolation success signal is generated, and the isolation success signal is sent to the distribution terminal configured for each contact switch.

[0065] The side of the fault point away from the substation is the downstream of the fault point. When a fault occurs in the distributed power supply system, the distribution terminal located downstream of the fault point and closest to the fault point controls the power switch connected to it to open, and sends the isolation success signal generated by the power switch opening to each distribution terminal connected to the contact switch.

[0066] It should be noted that: since an information interaction mechanism is established between adjacent distribution terminals, the distribution terminal configured with the fault isolation switch will send an isolation success signal to each distribution terminal configured with the interconnecting switch through the adjacent distribution terminal and the adjacent distribution terminal of the adjacent distribution terminal.

[0067] For example, Figure 1As shown, if F1 is the fault point, the distribution terminal configured for the power switch 102 is the distribution terminal that is downstream of the fault point and closest to the fault point. When the distribution terminal configured for the power switch 102 controls the power switch 102 to open, the distribution terminal configured for the power switch 102 will receive the isolation success signal generated by the opening of the power switch 102, and the distribution terminal configured for the power switch 102 will send the isolation success signal to the distribution terminal configured for the power switch 103, and the distribution terminal configured for the power switch 103 will send the isolation success signal to the distribution terminal configured for the power switch 106, and the distribution terminal configured for the power switch 106 will send the isolation success signal to the distribution terminal configured for the contact switch 302; while the distribution terminal configured for the power switch 103 sends the isolation success signal to the distribution terminal configured for the power switch 106, the distribution terminal configured for the power switch 103 will send the isolation success signal to the distribution terminal configured for the contact switch 302. The distribution terminal configured with the power supply switch 104 will also send an isolation success signal to the distribution terminal configured with the power supply switch 104, the distribution terminal configured with the power supply switch 104 will send an isolation success signal to the distribution terminal configured with the power supply switch 105, the distribution terminal configured with the power supply switch 105 will send an isolation success signal to the distribution terminal configured with the power supply switch 107, and the distribution terminal configured with the power supply switch 107 will send an isolation success signal to the distribution terminal configured with the connecting switch 303; while the distribution terminal configured with the power supply switch 105 sends the isolation success signal to the distribution terminal configured with the power supply switch 107, the distribution terminal configured with the power supply switch 105 will also send an isolation success signal to the distribution terminal configured with the connecting switch 301.

[0068] S130. The power distribution terminal configured with each tie switch receives the isolation success signal, and sends the power switch characteristic data of the power point switch and the tie switch characteristic data of the tie switch to the power distribution terminal configured with the fault isolation switch.

[0069] Among them, the distribution terminal of each interconnection switch receives the power switch characteristic data of the power point switch at a relatively close distance. The source switch characteristic data is the data reflecting the power point switch status, and the interconnection switch characteristic data is the data reflecting the interconnection switch status. The interconnection switch characteristic data includes the number of opening and closing actions, the control circuit status, the energy storage status, and the number.

[0070] Specifically, the power switch characteristic data of the power point switch and the connecting switch characteristic data of the connecting switch are sent to the distribution terminal configured with the fault isolation switch, so that the distribution terminal configured with the subsequent fault isolation switch can select the optimal distributed power supply system self-healing path according to the actual situation of each power point switch and the connecting switch.

[0071] In addition, since an information interaction mechanism is established between adjacent distribution terminals, each distribution terminal configured with a connecting switch will send the power switch characteristic data and the connecting switch characteristic data to the distribution terminal configured with the fault isolation switch through the adjacent distribution terminal and the adjacent distribution terminal of the adjacent distribution terminal. The process in which each distribution terminal configured with a connecting switch sends the power switch characteristic data and the connecting switch characteristic data to the distribution terminal configured with the fault isolation switch is similar to the process in which the distribution terminal configured with the fault isolation switch sends the isolation success signal to each distribution terminal configured with the connecting switch, and this solution will not be described in detail.

[0072] S140. The distribution terminal configured with the fault isolation switch determines the target tie switch according to the characteristic data of the power switch and the characteristic data of the tie switch, and sends the number of the target tie switch to each distribution terminal configured with the tie switch.

[0073] Specifically, the target tie switch refers to the tie switch that is most suitable for closing the power supply to the non-fault area. The power distribution terminal configured with the fault isolation switch can analyze the characteristics of the power supply in the distributed power supply system according to the power switch characteristic data and the tie switch characteristic data, judge the operating state of each tie switch, and the load of each selectable self-healing path, so as to determine the optimal self-healing path, and then determine the target tie switch.

[0074] In addition, the power distribution terminal configured with the barrier isolating switch receives the tie switch characteristic data of each tie switch, so the number of the tie switch determined as the target tie switch can be obtained.

[0075] It should be noted that: since an information interaction mechanism is established between adjacent distribution terminals, the process in which the distribution terminal configured with the fault isolation switch sends the number of the target interconnecting switch to the distribution terminal configured with each interconnecting switch is similar to the process in which the distribution terminal configured with the fault isolation switch sends the isolation success signal to the distribution terminal configured with each interconnecting switch. This solution will not go into details.

[0076] S150. The power distribution terminal configured with the tie switch having the same number as the target tie switch controls the connected tie switch to close, so as to restore power supply to the non-fault area of ​​the power supply system.

[0077] Specifically, after receiving the number of the target contact switch, the distribution terminal of each contact switch checks it with the number of the contact switch connected to itself. The distribution terminal with the same number will control the contact switch connected to it to close the switch, thereby restoring power supply to the non-fault area.

[0078] In the embodiment of the present invention, when a fault occurs in the power supply system, the distribution terminal configured with the power switch downstream of the fault point controls the power switch connected to it to open, defines the power switch that performs the opening as a fault isolation switch, generates an isolation success signal after the fault isolation switch is opened successfully, and sends the isolation success signal to the distribution terminal configured with each connecting switch; the distribution terminal configured with each connecting switch receives the isolation success signal, sends the power switch characteristic data of the power point switch and the connecting switch characteristic data of the connecting switch to the distribution terminal configured with the fault isolation switch, so that the distribution terminal configured with the fault isolation switch can select the optimal self-healing path according to the power switch characteristic data and the connecting switch characteristic data, determine the target connecting switch, and send the number of the target connecting switch to the distribution terminal configured with each connecting switch, so that the distribution terminal configured with the connecting switch with the same number as the target connecting switch controls the connecting switch connected to it to close, so as to restore power supply to the non-fault area of ​​the power supply system.

[0079] On the basis of the above embodiment, before the power supply system is operated, it also includes: establishing an information interaction mechanism between adjacent distribution terminals according to the topological structure and lightweight communication protocol of the power supply system.

[0080] Among them, the lightweight communication protocol is a communication protocol with simple design, low resource consumption and high efficiency. The lightweight communication protocol has the characteristics of low requirements on hardware resources, less memory and processing power, high data transmission efficiency, fast connection establishment and data exchange, simple protocol design, and good compatibility and scalability.

[0081] The connection location of each distribution terminal can be known based on the topological structure of the power supply system, thereby establishing horizontal wireless communication between adjacent distribution terminal devices based on a lightweight communication protocol to achieve information interaction between adjacent distribution terminal devices and realize peer-to-peer communication between distribution terminals.

[0082] For example, according to Figure 1 The connection position of each distribution terminal can be known, and horizontal wireless communication between the distribution terminal configured with the power point switch 201 and the distribution terminal configured with the power supply switch 101 can be established based on the lightweight communication protocol. Based on the lightweight communication protocol, horizontal wireless communication between the distribution terminal configured with the power supply switch 101 and the distribution terminal configured with the power supply switch 102 can be established, and so on... until the information interaction mechanism between all adjacent distribution terminals is established.

[0083] Optionally, the lightweight communication protocol includes a message queue telemetry transport protocol.

[0084] Among them, Message Queuing Telemetry Transport (MQTT) is a lightweight message transmission protocol. The MQTT protocol is concise, the message header occupies less bandwidth, and it runs efficiently in low-bandwidth networks. MQTT uses a publish / subscribe model, where clients can subscribe to a specific topic to receive messages related to the topic; publishers publish messages to a specific topic, so that all clients subscribed to the topic will receive the message. MQTT supports three different levels of message transmission quality, including at most once, at least once, and only once transmission, and the appropriate level can be selected according to application requirements. MQTT allows clients to establish persistent sessions so that they can restore previous subscription and messaging states when they reconnect after the connection is lost. MQTT can run on a variety of network protocols, including TCP / IP, WebSocket, and other protocols.

[0085] According to the above characteristics of the MQTT protocol, the power supply system of this scheme adopts the MQTT protocol to establish horizontal wireless communication between distribution terminal devices. According to the MQTT protocol, through the subscription and publishing mechanism, fast communication between distribution terminal devices can be achieved, thereby realizing the rapid selection and control of the optimal self-healing path.

[0086] Based on the above embodiment, optionally, Figure 3 A flowchart of the steps of establishing an information interaction mechanism between adjacent power distribution terminals is provided in an embodiment of the present invention. Figure 3 As shown, the steps of establishing an information interaction mechanism between adjacent distribution terminals according to the topological structure of the power supply system and the lightweight communication protocol are described:

[0087] S210. According to the topological structure of the power supply system, a power distribution terminal of the power supply system is set as a client and a comprehensive measurement and control communication unit of a ring main unit adjacent to the substation is set as a server.

[0088] S220. According to the message queue telemetry transmission protocol and the interactive information of the power supply system, configure the topic and subscription topic of each distribution terminal so that adjacent distribution terminals can publish information through corresponding topics and receive information through corresponding subscription topics.

[0089] Among them, interactive information refers to the data exchanged between adjacent distribution terminals, and the interactive information includes the fault information related to the switch, the fault isolation result information of the switch, the switch refusal information of the switch, the characteristics of the power point switch, the real-time load of the downstream switch of the fault point, the number of times the connecting switch is opened and closed, the connecting switch ID, etc.

[0090] Exemplarily, the topic of the fault information related to the switch configured by the power distribution terminal of the power switch 101 is "topic1", and the topic of the switch refusal information of the power distribution terminal configured by the power switch 102 is "topic2". If the power supply switch 101 subscribes to the topic "topic2", the power distribution terminal configured by the power switch 102 sends information through the topic "topic2". At this time, the power distribution terminal configured by the power switch 101 receives the switch refusal information of the switch sent by the power distribution terminal configured by the power switch 102 by subscribing to the topic "topic2".

[0091] Based on the above embodiment, optionally, Figure 4 A flow chart of another distributed power supply system self-healing control method provided by an embodiment of the present invention. Figure 4 As shown, the distributed power supply system self-healing control method includes:

[0092] S310: Establish an information interaction mechanism between adjacent power distribution terminals according to the topological structure of the power supply system and the lightweight communication protocol.

[0093] S320. Each power distribution terminal monitors the current data of the power switch connected thereto.

[0094] Each power distribution terminal monitors the current data of the power switch to which it is connected to determine whether the current flowing through the power switch is normal, thereby determining whether a fault occurs in the line where the power switch is located.

[0095] S330. The distribution terminal that monitors abnormal current data sends fault information of the switch.

[0096] S340. Each distribution terminal determines whether it is a distribution terminal upstream of the fault point or a distribution terminal downstream of the fault point based on its own sent information and received information.

[0097] Specifically, if the distribution terminal sends the switch fault information, receives the switch fault information sent by the upstream adjacent distribution terminal, and does not receive the switch fault information sent by the downstream adjacent distribution terminal, then the distribution terminal is the distribution terminal upstream of the fault point.

[0098] If the distribution terminal does not send the switch fault information, receives the switch fault information sent by the upstream adjacent distribution terminal, and does not receive the switch fault information sent by the downstream adjacent distribution terminal, then the distribution terminal is the distribution terminal downstream of the fault point.

[0099] For example, continue to refer to Figure 1, a fault occurs at point F1 of the distributed power supply system. After the distribution terminal of the power point switch 201 and the distribution terminal of the power supply switch 101 detect that a fault occurs at point F1 of the distributed power supply system, the distribution terminal of the power point switch 201 and the distribution terminal of the power supply switch 101 publish "fault information of this switch". At the same time, to ensure reliability, the subject of this information is published at least once.

[0100] Among them, the distribution terminal of power supply switch 101 sends the fault information of this switch, receives the fault information of this switch sent by the distribution terminal of power point switch 201, but does not receive the fault information of this switch sent by the distribution terminal of power supply switch 102. It can be determined that the distribution terminal configured for power supply switch 101 is the distribution terminal upstream of the fault point.

[0101] The distribution terminal of power supply switch 102 did not send the fault information of this switch, but received the fault information of this switch sent by the distribution terminal of power supply switch 101, but did not receive the fault information of this switch sent by the distribution terminal of power supply switch 103. It can be determined that the distribution terminal configured for power supply switch 102 is the distribution terminal downstream of the fault point.

[0102] S350. When a fault occurs in the power supply system, the distribution terminal configured for the power supply switch downstream of the fault point controls the power supply switch connected to it to open, and the power supply switch that performs the opening is defined as a fault isolation switch. After the fault isolation switch opens successfully, an isolation success signal is generated, and the isolation success signal is sent to the distribution terminal configured for each contact switch.

[0103] S360. The power distribution terminal configured with each tie switch receives the isolation success signal, and sends the power switch characteristic data of the power point switch and the tie switch characteristic data of the tie switch to the power distribution terminal configured with the fault isolation switch.

[0104] S370. The distribution terminal configured with the fault isolation switch determines the target interconnection switch according to the characteristic data of the power switch and the characteristic data of the interconnection switch, and sends the number of the target interconnection switch to the distribution terminal configured with each interconnection switch.

[0105] S380. The distribution terminal configured with the tie switch having the same number as the target tie switch controls the connected tie switch to close, so as to restore power supply to the non-fault area of ​​the power supply system.

[0106] Based on the above embodiment, optionally, after each distribution terminal determines whether it is a distribution terminal upstream of the fault point or a distribution terminal downstream of the fault point according to its own sending information and receiving information, the method further includes:

[0107] The distribution terminal upstream of the fault point controls the connected power supply switch to open

[0108] The distribution terminal downstream of the fault point records the real-time load 1 second before the fault of the connected fault isolation switch.

[0109] Among them, the distribution terminal upstream of the fault point controls the power supply switch connected to it to open, which can isolate the fault point from the non-fault area upstream of the fault point, thereby ensuring normal power supply to the non-fault area. The distribution terminal downstream of the fault point records the real-time load of the fault isolation switch connected to it 1 second before the fault, that is, records the load of the power supply to the non-fault area downstream of the fault point, which can provide data conditions for the subsequent determination of the target contact switch to ensure that the self-healing line after the determined target contact switch is closed can normally supply power to the restored power supply area.

[0110] Based on the above embodiment, optionally, the power switch characteristic data includes power point switch properties, power point switch capacity and power point switch real-time load;

[0111] The characteristic data of the interconnecting switch include the number of opening and closing actions, the control circuit status, the energy storage status and the number.

[0112] Based on the above embodiment, optionally, Figure 5 A flowchart of the steps of determining a target tie switch provided by an embodiment of the present invention. Figure 5 As shown, the steps of determining the target tie switch according to the power switch characteristic data and the tie switch characteristic data for the distribution terminal configured with the fault isolation switch are described:

[0113] S410, determining a screening strategy according to the power point switch property of each power point switch; the screening strategy includes a first screening strategy and a second screening strategy.

[0114] Among them, the power point switch properties include distributed power switches and conventional power switches.

[0115] Distributed power switch refers to the switch connected to distributed power, and conventional power switch refers to the switch connected to the substation.

[0116] Specifically, if the power point switch property of the power point switch is a distributed power switch, the screening strategy is the first screening strategy.

[0117] If the power point switch property of the power point switch is a conventional power switch, the screening strategy is the second screening strategy.

[0118] S420: Determine a target tie switch according to the first screening strategy or the second screening strategy.

[0119] Based on the above embodiment, optionally, Figure 6 A flowchart of a step of determining the serial number of a target contact switch according to a first screening strategy provided by an embodiment of the present invention. Figure 6As shown, the steps of determining the target contact switch according to the first screening strategy are described:

[0120] S510, screening the tie switch closest to the power point switch whose property is a distributed power switch.

[0121] S520: The contact switch closest to the power point switch whose property is a distributed power switch is the target contact switch.

[0122] For example, continue to refer to Figure 1 If the power point switch 203 is a distributed power switch, the tie switch 302 is the target tie switch; if the power point switch 204 is a distributed power switch, the tie switch 303 is the target tie switch.

[0123] Based on the above embodiment, optionally, Figure 7 A flowchart of the steps of determining a target contact switch according to a second screening strategy is provided in an embodiment of the present invention. Figure 7 As shown, the steps of determining the target contact switch according to the second screening strategy are described:

[0124] S610: Determine the operating state of each tie switch according to the control loop state and energy storage state of each tie switch.

[0125] If the control circuit state and / or the energy storage state of the tie switch are abnormal, it means that the tie switch is abnormal; if the control circuit state and the energy storage state of the tie switch are normal, it means that the tie switch is normal.

[0126] S620: Obtain a first tie switch to be screened according to the operating status of each tie switch.

[0127] The abnormal connecting switches are screened out to obtain the normal connecting switches, namely the first connecting switches to be screened.

[0128] S630, selecting the second connecting switches to be selected according to the load to be transferred and the power point switch capacity of the power point switch closest to each first connecting switch to be selected and the real-time load of the power point switch.

[0129] Specifically, the load to be transferred is the real-time load of the fault isolation switch obtained 1 second before the fault, and the remaining capacity of each power point switch can be known through the power point switch capacity and the real-time load of the power point switch. By comparing with the remaining capacity of each power point switch, if the remaining capacity of the power point switch is less than 1.2 the real-time load of the fault isolation switch 1 second before the fault, the tie switch is screened out; if the remaining capacity of the power point switch is greater than 1.2 the real-time load of the fault isolation switch 1 second before the fault, the tie switch is screened out to obtain the second tie switch to be screened.

[0130] S640, determine the target contact switch according to the number of opening and closing actions of the second contact switch to be screened. Specifically, compare the number of opening and closing actions of each contact switch in the second contact switch to be screened, and the contact switch with the least number of opening and closing actions is the target contact switch.

[0131] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0132] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-healing control method for a distributed power supply system, characterized in that: The power supply system includes a plurality of power switches, a plurality of power point switches and a plurality of connecting switches; each of the power switches, each of the power point switches and each of the connecting switches is equipped with a power distribution terminal; The distributed power supply system self-healing control method comprises: When the power supply system operates normally, the power distribution terminal configured with each power point switch sends the power switch characteristic data of the power point switch connected to it to the power distribution terminal configured with at least one tie switch; When a fault occurs in the power supply system, the power distribution terminal configured for the power supply switch downstream of the fault point controls the power supply switch connected thereto to open, and the power supply switch that performs the opening is defined as a fault isolation switch. After the fault isolation switch opens successfully, an isolation success signal is generated, and the isolation success signal is sent to the power distribution terminal configured for each of the tie switches; The power distribution terminal configured with each of the tie switches receives the isolation success signal, and sends the power switch characteristic data of the power point switch and the tie switch characteristic data of the tie switch to the power distribution terminal configured with the fault isolation switch; The power distribution terminal configured with the fault isolation switch determines the target tie switch according to the power switch characteristic data and the tie switch characteristic data, and sends the number of the target tie switch to the power distribution terminal configured with each tie switch; The power distribution terminal configured with the tie switch having the same number as the target tie switch controls the connected tie switch to close, so as to restore power supply to the non-fault area of ​​the power supply system.

2. The self-healing control method for a distributed power supply system according to claim 1, characterized in that: Before the power distribution terminal configured for the power switch downstream of the fault point controls the connected power switch to open, the method further includes: Each of the power distribution terminals monitors the current data of the power switch connected thereto; The power distribution terminal that monitors the abnormal current data sends the switch fault information; Each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point based on its own sending information and receiving information.

3. The self-healing control method for a distributed power supply system according to claim 2, characterized in that: Each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point according to its own sending information and receiving information, including: If the power distribution terminal sends the switch fault information, receives the switch fault information sent by the upstream adjacent power distribution terminal, and does not receive the switch fault information sent by the downstream adjacent power distribution terminal, then the power distribution terminal is the power distribution terminal upstream of the fault point; If the distribution terminal does not send the switch fault information, receives the switch fault information sent by the upstream adjacent distribution terminal, and does not receive the switch fault information sent by the downstream adjacent distribution terminal, then the distribution terminal is the distribution terminal downstream of the fault point.

4. The self-healing control method for a distributed power supply system according to claim 2, characterized in that: After each of the power distribution terminals determines whether it is the power distribution terminal upstream of the fault point or the power distribution terminal downstream of the fault point according to its own sending information and receiving information, the method further includes: The power distribution terminal upstream of the fault point controls the power supply switch connected thereto to open; The power distribution terminal downstream of the fault point records the real-time load of the fault isolation switch connected thereto 1 second before the fault.

5. The self-healing control method for a distributed power supply system according to claim 1, characterized in that: The power switch characteristic data includes power point switch properties, power point switch capacity and power point switch real-time load; The tie switch characteristic data includes the number of opening and closing actions, control circuit status, energy storage status and number.

6. The self-healing control method for a distributed power supply system according to claim 5, characterized in that: The power distribution terminal configured by the fault isolation switch determines the target tie switch according to the power switch characteristic data and the tie switch characteristic data, including: Determine a screening strategy according to the power point switch property of each power point switch; the screening strategy includes a first screening strategy and a second screening strategy; The target tie switch is determined according to the first screening strategy or the second screening strategy.

7. The self-healing control method for a distributed power supply system according to claim 6, characterized in that: The power point switch properties include distributed power switches and conventional power switches; The step of determining a screening strategy according to the power point switch property of each power point switch comprises: If the power point switch property of the power point switch is a distributed power switch, the screening strategy is a first screening strategy; If the power point switch property of the power point switch is a conventional power switch, the screening strategy is a second screening strategy.

8. The self-healing control method for a distributed power supply system according to claim 7, characterized in that: Determining the target tie switch according to the first screening strategy includes: Select the tie switch closest to the power point switch whose property is a distributed power switch; The tie switch that is closest to the power point switch whose property is a distributed power switch is the target tie switch.

9. The self-healing control method for a distributed power supply system according to claim 8, characterized in that: Determining the target tie switch according to the second screening strategy includes: Determining the operating state of each of the tie switches according to the control loop state and the energy storage state of each of the tie switches; According to the operating state of each of the tie switches, obtaining a first tie switch to be screened; Select the second tie switches to be selected according to the load to be transferred and the power point switch capacity of the power point switch closest to each of the first tie switches to be selected and the real-time load of the power point switch; The target tie switch is determined according to the number of opening and closing actions of the second tie switch to be screened.

10. The self-healing control method for a distributed power supply system according to claim 1, characterized in that: Before the power supply system is operated, it also includes: According to the topological structure and lightweight communication protocol of the power supply system, an information interaction mechanism is established between adjacent power distribution terminals; Wherein, the lightweight communication protocol includes a message queue telemetry transmission protocol; The establishing of an information interaction mechanism between adjacent power distribution terminals according to the topological structure of the power supply system and the lightweight communication protocol includes: According to the topological structure of the power supply system, the power distribution terminal of the power supply system is set as a client and a comprehensive measurement and control communication unit of a ring main unit adjacent to the substation is set as a server; According to the message queue telemetry transmission protocol and the interactive information of the power supply system, the topic and subscription topic of each distribution terminal are configured so that adjacent distribution terminals can publish information through corresponding topics and receive information through corresponding subscription topics.

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