Power line control method and device, nonvolatile storage medium and electronic device

Abstract

The application discloses a power line control method and device, a nonvolatile storage medium and an electronic device. The method comprises the following steps: determining a first transformer substation connected with a power station, and a second transformer substation which has a power connection with the first transformer substation and does not have a fiber communication capability; acquiring a first switch signal representing the breaking of a circuit breaker of the second transformer substation, wherein the first switch signal is an optical signal; performing photoelectric conversion on the first switch signal to obtain a second switch signal, wherein the second switch signal is an electrical signal; sending the second switch signal to the first transformer substation by using a multiplexing channel; and in the case that the second switch signal indicates breaking, controlling the first transformer substation to cut off the connection with the power station, wherein the multiplexing channel does not occupy the fiber communication capability for signal transmission. The application solves the technical problem of high linkage control limitation in the related art.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and in particular to a power line control method, device, non-volatile storage medium and electronic equipment. Background Art

[0002] In power systems, disconnecting substation lines is a crucial step in maintaining stable grid operation and optimizing resource allocation. To ensure system stability and safety after line disconnection, a coordinated control strategy is required. This coordinated control strategy aims to minimize the impact on grid operations and optimize resource efficiency by coordinating the operations of multiple devices and links. However, coordinated control can pose the risk of islanding. Islanding occurs when a portion of the power grid is separated from the main grid due to factors such as line disconnection or failure, forming a relatively independent power system. This can pose a potential threat to equipment and grid recovery.

[0003] To achieve effective coordinated control, related technologies rely on dedicated fiber-optic communication technology between substations. Fiber-optic communication offers high stability, strong anti-interference capabilities, and high-speed transmission. However, the coverage of fiber-optic communication networks is limited by geographical and physical conditions, and construction and maintenance costs are relatively high. These limitations significantly restrict the coordinated control of power lines between substations.

[0004] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0005] The embodiments of the present invention provide a power line control method, device, non-volatile storage medium and electronic device to at least solve the technical problem of high linkage control limitations existing in the related art.

[0006] According to one aspect of an embodiment of the present invention, a power line control method is provided, comprising: determining a first substation connected to a power station, and a second substation that has a power connection with the first substation and does not have fiber optic communication capability; obtaining a first switching signal indicating that a circuit breaker of the second substation executes opening, wherein the first switching signal is an optical signal; performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; using a multiplexing channel to send the second switching signal to the first substation, and when the second switching signal indicates a circuit breaker is disconnected, controlling the first substation to cut off the connection with the power station, wherein the multiplexing channel does not occupy fiber optic communication capability for signal transmission.

[0007] Optionally, obtaining the first switching signal indicating that the circuit breaker of the second substation is opening includes: determining a first predetermined node on the power line connecting the second substation to the power station via the first substation; and obtaining the switching quantity generated by the circuit breaker opening at the first predetermined node as the first switching signal.

[0008] Optionally, the multiplexing channel is used in common by multiple substations included in the power grid, and the multiple substations include the first substation and the second substation. The multiple substations interact with each other through corresponding digital communication equipment via a synchronous digital hierarchy (SDH) network, wherein the SDH network is used to transmit signals according to the corresponding transmission rates of the multiple substations.

[0009] Optionally, performing optoelectronic conversion on the first switch signal to obtain the second switch signal includes: using an optical fiber transceiver mode to input the first switch signal into an optoelectronic conversion interface for optoelectronic conversion to obtain the second switch signal, wherein the optoelectronic conversion interface and the digital communication equipment corresponding to the second substation use an electrical signal transceiver mode with anti-interference capability.

[0010] Optionally, the electrical signal transceiving method includes a coaxial cable transceiving method or a twisted pair transceiving method.

[0011] Optionally, the first substation is electrically connected to the second substation via an intermediate substation, wherein a first communication connection supporting optical fiber communication capability exists between the intermediate substation and the first substation, and a second communication connection supporting optical fiber communication capability exists between the intermediate substation and the second substation. After obtaining the first switching signal indicating that the circuit breaker of the second substation executes the opening, the method further includes: controlling the second substation to send the first switching signal to the intermediate substation through the second communication connection; generating a general object oriented substation event GOOSE information based on the first switching signal; controlling the intermediate substation to send the GOOSE information to the first substation through the first communication connection; and controlling the first substation to cut off the connection with the power station based on the GOOSE information.

[0012] Optionally, the first predetermined node of the second substation has the first communication connection with the second predetermined node of the intermediate substation, and the third predetermined node of the intermediate substation has the second communication connection with the fourth predetermined node of the first substation. The control of the intermediate substation to send the GOOSE information to the first substation through the first communication connection includes: using a first intelligent terminal set at the intermediate substation to send the GOOSE information generated at the second predetermined node to the third predetermined node, wherein the first intelligent terminal is used for communication interaction between multiple intermediate nodes included in the intermediate substation, and the multiple intermediate nodes include the second predetermined node and the third predetermined node; sending the GOOSE information from the third predetermined node of the intermediate substation to the fourth predetermined node included in the first substation through the second communication connection; using a second intelligent terminal set at the first substation to control the first substation to cut off the connection with the power station based on the GOOSE information received by the fourth predetermined node, wherein the second intelligent terminal is used for communication interaction between multiple first nodes included in the first substation, and the multiple first nodes include the fourth predetermined node.

[0013] According to another aspect of an embodiment of the present invention, there is provided a power line control device, comprising: a determination module for determining a first substation connected to a power station, and a second substation that has an electrical connection with the first substation and does not have optical fiber communication capability; an acquisition module for acquiring a first switching signal indicating that a circuit breaker of the second substation executes opening, wherein the first switching signal is an optical signal; a conversion module for performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; and a linkage module for using a multiplexing channel to send the second switching signal to the first substation, and when the second switching signal indicates a circuit breaker is disconnected, controlling the first substation to cut off the connection with the power station, wherein the multiplexing channel does not occupy optical fiber communication capability for signal transmission.

[0014] According to another aspect of an embodiment of the present invention, a non-volatile storage medium is provided, wherein the non-volatile storage medium stores a plurality of instructions, wherein the instructions are suitable for being loaded by a processor and executed by any one of the power line control methods.

[0015] According to another aspect of an embodiment of the present invention, an electronic device is provided, comprising: one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the power line control methods described.

[0016] In an embodiment of the present invention, a linkage control method that does not occupy the number of optical fiber cores is adopted. The method comprises determining a first substation connected to a power station and a second substation that has an electrical connection to the first substation but does not have optical fiber communication capability; obtaining a first switch signal indicating that the circuit breaker of the second substation has executed a trip, wherein the first switch signal is an optical signal; performing photoelectric conversion on the first switch signal to obtain a second switch signal, wherein the second switch signal is an electrical signal; using a multiplexing channel, sending the second switch signal to the first substation, and controlling the first substation to cut off the connection with the power station when the second switch signal indicates a circuit breaker is disconnected, wherein the multiplexing channel does not occupy optical fiber communication capability for signal transmission. The purpose of realizing linkage control between substations without the need for optical fiber communication capability is achieved, achieving the technical effect of reducing substation communication and the limitations of linkage control of the power system, thereby solving the technical problem of high linkage control limitations existing in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of an optional power line control method provided according to an embodiment of the present invention;

[0019] Figure 2 is a system connection diagram of an optional power line control method provided according to an embodiment of the present invention;

[0020] Figure 3 is a multiplexing schematic diagram of an optional power line control method provided according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of an optional power line control method provided according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of an optional power line control method provided according to an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of an optional power line control device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description 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 numbers 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] For ease of description, some nouns or terms involved in the embodiments of the present application are explained below:

[0027] Synchronous Digital Hierarchy (SDH) is a technical system for transmitting digital signals at different rates. It includes multiplexing methods, mapping methods and related synchronization methods, which improves the utilization of large amounts of bandwidth on the transmission network.

[0028] Generic Object Oriented Substation Event (GOOSE) information is a mechanism designed to meet the rapid messaging requirements of substation automation systems. It is primarily used to transmit real-time signals, including trip and closing signals, between multiple intelligent electronic devices (IEDs). GOOSE replaces traditional hard-wired communication between substation devices with network signals, simplifying secondary cabling within the substation.

[0029] Pulse Code Modulation (PCM) converts analog signals into standard digital signals through sampling, quantization, and encoding. Low-speed services are converted into digital signals and loaded into 64 kbit / s (bits per second) channels, which are then multiplexed to 2 megabits per second. Therefore, PCM equipment is also called multiplexing equipment. PCM microwave communication equipment uses microwaves as the transmission medium and utilizes PCM technology to convert analog signals into digital signals for transmission. Microwave transmission has the advantages of large bandwidth, long transmission distance, and strong anti-interference capabilities. Both PCM microwave and PCM fiber-optic communication equipment utilize PCM technology to convert analog signals into digital signals for transmission.

[0030] In response to the above problems, an embodiment of the present invention provides an embodiment of a method for controlling a power line. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0031] Figure 1 FIG. 1 is a flow chart of an optional power line control method according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0032] Step S102, determining a first substation connected to the power station and a second substation that has a power connection to the first substation and does not have optical fiber communication capability;

[0033] It can be understood that the first substations directly connected to the power station and the second substations that have power connections to the first substations but are not yet equipped with fiber optic communication capabilities are determined. By identifying the first substations connected to the power station and the second substations that have power connections to the power station but are not equipped with fiber optic communication capabilities, a basis is provided for subsequent linkage control, ensuring that key nodes can be identified in the power system and bottlenecks of island operation can be prevented.

[0034] Step S104, obtaining a first switching signal indicating that the circuit breaker of the second substation is opening, wherein the first switching signal is an optical signal;

[0035] It can be understood that a first switching signal indicating that the circuit breaker of the second substation performs a tripping operation is obtained. The first switching signal is an optical signal, which has the characteristics of fast transmission speed and strong anti-interference ability, and is suitable for fast response scenarios in power systems.

[0036] In an optional embodiment, obtaining a first switching signal indicating that the circuit breaker of the second substation has executed opening includes: determining a first predetermined node on the power line connecting the second substation to the power station via the first substation; and obtaining the switching quantity generated by the circuit breaker executing opening at the first predetermined node as the first switching signal.

[0037] As can be understood, in power systems, monitoring points and circuit breakers are installed at key locations along power lines. First, a first predetermined node on the power line connecting the second substation to the power station via the first substation is identified. The status of the circuit breaker at this node significantly influences whether islanding will occur. After determining the first predetermined node, the status of the circuit breaker at that node is monitored. When the circuit breaker performs an opening operation, a switching value changes. This first switching signal reflects the circuit breaker opening status and can indicate whether the first substation will experience islanding due to the second substation being disconnected from the power grid.

[0038] Optionally, the first switching quantity can be obtained by using a relay protection optical fiber communication interface device, which can cooperate with various line protection or safety automatic devices to independently transmit protection command information, and all command information can be transmitted simultaneously.

[0039] In an optional embodiment, the first substation is electrically connected to the second substation via an intermediate substation, wherein a first communication connection supporting optical fiber communication capability exists between the intermediate substation and the first substation, and a second communication connection supporting optical fiber communication capability exists between the intermediate substation and the second substation. After obtaining a first switching signal indicating that the circuit breaker of the second substation executes opening, the method further includes: controlling the second substation to send the first switching signal to the intermediate substation through the second communication connection; generating a general object oriented substation event GOOSE information based on the first switching signal; controlling the intermediate substation to send the GOOSE information to the first substation through the first communication connection; and controlling the first substation to cut off the connection with the power station based on the GOOSE information.

[0040] As can be understood, the first substation is connected to the second substation via the intermediate substation. Power flows from the power station through the first substation, the intermediate substation, and finally to the second substation. A first communication connection supporting fiber-optic communication exists between the intermediate substation and the first substation, ensuring efficient and reliable data transmission between them. A second communication connection supporting fiber-optic communication also exists between the intermediate substation and the second substation, ensuring efficient and reliable data transmission between them.

[0041] When the circuit breaker of the second substation performs an opening operation, a first switching signal representing this operation is generated, which controls the second substation to send the first switching signal to the intermediate substation through the second communication connection, utilizing the high speed and stability of optical fiber communication to ensure timely transmission of signals.

[0042] After receiving the first switch signal, the intermediate substation generates a Generic Object Oriented Substation Event (GOOSE) message based on this signal. GOOSE is a fast message used to transmit important real-time event information within the substation. The intermediate substation then sends this GOOSE message to the first substation via the first communication connection. This also leverages the advantages of fiber optic communication. Upon receiving the GOOSE message, the first substation uses this information to control the first substation to disconnect from the power station, preventing the first substation from operating in an isolated state.

[0043] Through the above processing, by introducing intermediate substations and fiber-optic communications, even in the case of complex power connections, the system can quickly and accurately identify the circuit breaker opening operation of the second substation and transmit this information to the first substation through the intermediate substation, thereby ensuring that the first substation can cut off the connection with the power station in time, preventing the occurrence of island operation and enhancing the stability and security of the power grid.

[0044] In an optional embodiment, a first communication connection exists between a first predetermined node of the second substation and a second predetermined node of the intermediate substation, and a second communication connection exists between a third predetermined node of the intermediate substation and a fourth predetermined node of the first substation, and the intermediate substation is controlled to send GOOSE information to the first substation through the first communication connection, including: using a first intelligent terminal set at the intermediate substation to send the GOOSE information generated at the second predetermined node to the third predetermined node, wherein the first intelligent terminal is used for communication interaction between multiple intermediate nodes included in the intermediate substation, and the multiple intermediate nodes include the second predetermined node and the third predetermined node; sending the GOOSE information from the third predetermined node of the intermediate substation to the fourth predetermined node included in the first substation through the second communication connection; using a second intelligent terminal set at the first substation to control the first substation to cut off the connection with the power station based on the GOOSE information received by the fourth predetermined node, wherein the second intelligent terminal is used for communication interaction between multiple first nodes included in the first substation, and the multiple first nodes include the fourth predetermined node.

[0045] It can be understood that communication interaction between the first substation, the intermediate substation, and the second substation in an FPGA (Field-Programmable Gate Array) or other communication system can be achieved through predetermined nodes and intelligent terminals in the substation. In particular, after a circuit breaker trip event occurs, GOOSE information is transmitted and the first substation is controlled to cut off the connection with the power station. The first predetermined node of the second substation (such as a circuit breaker at a predetermined location) is connected to the second predetermined node of the intermediate substation via a first communication connection. The third predetermined node of the intermediate substation is connected to the fourth predetermined node of the first substation via a second communication connection.

[0046] A first intelligent terminal is provided at the intermediate substation, responsible for processing internal communication interactions between multiple intermediate nodes (including the second predetermined node and the third predetermined node) in the intermediate substation. A second intelligent terminal is provided at the first substation, responsible for processing internal communication interactions between multiple first nodes (including the fourth predetermined node) in the first substation.

[0047] When the circuit breaker at the second substation performs an opening operation, a first switching signal is generated. Because a first communication connection exists between the first predetermined node of the second substation and the second predetermined node of the intermediate substation, the first switching signal is converted into a GOOSE message at the second predetermined node. The first intelligent terminal in the intermediate substation recognizes the GOOSE message generated at the second predetermined node and transmits it to the first substation via the second communication connection. The fourth predetermined node of the first substation receives the GOOSE message, and the second intelligent terminal, upon recognizing the GOOSE message, controls the first substation to disconnect from the power station based on the GOOSE message.

[0048] By configuring predetermined nodes and intelligent terminals, it is possible to ensure that GOOSE information can be accurately and quickly transmitted from the second substation to the first substation after a circuit breaker trip event occurs, ensuring the stable operation of the power grid through indirect forwarding.

[0049] Optionally, the first communication connection and the second communication connection may be dedicated optical fiber channels, that is, the relay protection optical fiber communication interface devices on both sides of the line are directly connected via the optical fiber channel.

[0050] Optionally, the first substation is recorded as substation A, the middle substation is recorded as substation B, and the second substation is recorded as substation C. Figure 2 FIG. 1 is a system connection diagram of an optional power line control method according to an embodiment of the present invention. Figure 2As shown, substation A is connected to the photovoltaic power station, which is in turn connected to substation B. The power supply from substation B is led to substation C and substation D respectively. When the line from bay 112 of substation C to bay 111 of substation B, or the line from bay 112 of substation B to bay 113 of substation A fails, the grid-connected switch to the photovoltaic power station (bay 114 of substation A) needs to be disconnected through coordinated control, and the photovoltaic power station stops grid-connected power generation to prevent it from operating in an islanded manner.

[0051] Whether the line from substation C 112 (the first predetermined node) to substation B 111 (the second predetermined node) experiences a permanent or transient fault, or the switch at substation C 112 is tripped for maintenance, the switch at substation A 114 must be tripped (this disconnects the connection between the first substation and the power station). To ensure that the switch at substation C 112 trips the switch at substation A 114 and prevents islanded operation at substation A, a relay protection fiber-optic communication interface device and an optoelectronic digital multiplexing interface device are deployed on both sides of substation C and A. The relay protection fiber-optic communication interface device is used to collect the switching values ​​of the circuit breaker, and the optoelectronic digital multiplexing interface device is used to perform optoelectronic conversion on the signals.

[0052] The switch at substation C 112 is set to the open (i.e., disconnected) position and connected to the remote input of the optical fiber longitudinal differential line protection. The line protection remote input of substation B 111 sends a GOOSE message to the remote input of the line protection device at substation B 112 (i.e., the third predetermined node) via a dedicated optical fiber channel (i.e., the first communication connection) between substation C 112 and substation B 111. Internal communication can be achieved using a first intelligent terminal installed in substation B. The line protection remote input of substation A 113 then sends a GOOSE message to the intelligent terminal (i.e., the second intelligent terminal) at substation A 114 via a dedicated optical fiber channel (i.e., the second communication connection) between substation B 112 and substation A 113 (i.e., the fourth predetermined node), thereby disconnecting the switch at substation A 114.

[0053] Step S106, performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal;

[0054] It can be understood that the first switching signal is photoelectrically converted into a second switching signal in the form of an electrical signal, thereby realizing the conversion of the signal format, so that the original optical signal can be transmitted on multiplexing channels such as power line carrier communication, thereby making full use of the existing power infrastructure and reducing communication costs.

[0055] In an optional embodiment, a multiplexing channel is used in common by multiple substations included in a power grid, where the multiple substations include a first substation and a second substation. The multiple substations interact with each other through corresponding digital communication equipment via a synchronous digital hierarchy (SDH) network, wherein the SDH network is used to transmit signals according to the transmission rates corresponding to the multiple substations.

[0056] It's understandable that the application of multiplexed channels in power grids, particularly when multiple substations interact via Synchronous Digital Hierarchy (SDH) networking, can achieve communication capabilities without sacrificing fiber core count. In power grids, multiplexed channels are used for data exchange between multiple substations. Synchronous Digital Hierarchy (SDH) is a digital transmission technology that provides transmission services for digital signals of varying rates through a unified frame structure, standard rates, and optical interfaces. In power grids, multiple substations interact via SDH networking using their respective digital communication equipment. SDH networking enables signal transmission at the transmission rate corresponding to each substation, ensuring real-time and accurate data transmission. Different substations may have different transmission rate requirements. SDH networking technology supports multiple transmission rates and can be flexibly configured based on the actual needs of each substation, enabling resource sharing and efficient utilization.

[0057] By combining multiplexing channels with SDH networking, signals or data streams from multiple substations are combined for transmission, while SDH networking provides a unified transmission platform and standardized interfaces to ensure that data can be accurately transmitted between substations.

[0058] It's important to note that channel multiplexing is a technology that combines and transmits multiple signals or data streams. Its application in power grids is primarily in data exchange between multiple substations. Channel multiplexing allows multiple substations to share the same physical channel for data transmission, improving communication resource utilization.

[0059] In an optional embodiment, the first switch signal is subjected to photoelectric conversion to obtain a second switch signal, including: using an optical fiber transceiver method, inputting the first switch signal into a photoelectric conversion interface for photoelectric conversion to obtain the second switch signal, wherein the photoelectric conversion interface and the digital communication equipment corresponding to the second substation use an electrical signal transceiver with anti-interference capability.

[0060] It can be understood that in scenarios involving multiple substations in the power grid communication system, the transmission and processing of signals need to ensure high efficiency, reliability and anti-interference. When the first switching signal (optical signal) needs to be converted into a second switching signal (electrical signal) for further processing or transmission, photoelectric conversion technology is used. Through the optical fiber transceiver mode, the first switching signal (optical signal) is transmitted to the photoelectric conversion interface, which can receive and identify the optical signal. Inside the photoelectric conversion interface, the optical receiving module converts the received optical signal into an electrical signal, and the converted electrical signal is the second switching signal. The converted second switching signal (electrical signal) is then output to the subsequent circuit or device for further processing or transmission. It is necessary to adopt an electrical signal transceiver mode with anti-interference capability. It is preferred to set the digital communication equipment corresponding to the second substation to receive and send electrical signals. Since there may be various interference factors in the power grid communication environment, such as electromagnetic interference, noise, etc., the process of transmitting electrical signals needs to have anti-interference capability to ensure accurate transmission of the signal.

[0061] Optionally, Figure 3 FIG. 1 is a schematic diagram of a multiplexing of an optional power line control method according to an embodiment of the present invention. Figure 3 As shown, the relay protection fiber-optic communication interface device can cooperate with various line protection or safety automatic devices to independently transmit protection command information, and all command information can be transmitted simultaneously. The relay protection fiber-optic communication interface device uses FPGA technology to provide a full-duplex data channel, using optical fiber as the transmission medium to transmit protection command information. The relay protection fiber-optic communication interface device can use a dedicated optical fiber cable as a channel, or it can provide a 2M interface and a codirectional 64K (kilobyte) interface through an external conversion device to multiplex with digital communication equipment (PCM, SDH microwave / fiber optic, etc.). When multiplexing digital communication equipment via a 64K codirectional digital interface or a 2M interface, this can be achieved by installing a dedicated optoelectronic conversion digital multiplexing interface device in the communication room.

[0062] In an optional embodiment, the electrical signal transceiving method includes a coaxial cable transceiving method or a twisted pair transceiving method.

[0063] As you can understand, coaxial cable has excellent anti-interference capabilities due to its unique structure (inner conductor, insulation layer, outer conductor, and jacket). It can effectively prevent electromagnetic interference and signal leakage, making signal transmission more stable and reliable, and is used for transmitting high-frequency signals. Twisted-pair cable consists of two wires twisted together. This twisting method can reduce electromagnetic interference and signal attenuation, and is used to transmit lower-frequency signals.

[0064] Step S108: Use the multiplexing channel to send the second switch signal to the first substation. When the second switch signal indicates a disconnection, control the first substation to cut off the connection with the power station. The multiplexing channel does not occupy the optical fiber communication capacity for signal transmission.

[0065] It can be understood that a multiplexing channel is used to send the second switch signal to the first substation. When the second switch signal indicates a circuit breaker, the first substation is controlled to cut off the connection with the power station, thereby realizing linkage control in the power system and ensuring that when an abnormal situation such as a circuit breaker tripping occurs in the second substation, the electrical signal is sent to the first substation via the multiplexing channel to achieve a rapid response. By controlling the first substation to cut off the connection with the power station, the first substation is avoided from operating in an isolated island.

[0066] Through the above-mentioned step S102, a first substation connected to the power station and a second substation that has an electrical connection to the first substation but does not have fiber optic communication capability are determined; in step S104, a first switching signal is obtained, indicating that the circuit breaker of the second substation has executed a trip, wherein the first switching signal is an optical signal; in step S106, the first switching signal is photoelectrically converted to obtain a second switching signal, wherein the second switching signal is an electrical signal; in step S108, the second switching signal is transmitted to the first substation using a multiplexing channel, and if the second switching signal indicates a circuit break, the first substation is controlled to cut off its connection with the power station, wherein the multiplexing channel does not occupy fiber optic communication capability for signal transmission. This can achieve the purpose of achieving the technical effect of inter-substation linkage control without requiring fiber optic communication capability, thereby resolving the technical problem of high linkage control limitations existing in related technologies.

[0067] Based on the above embodiments and optional embodiments, the present invention proposes an optional implementation mode, Figure 2 As shown, substation A is connected to the photovoltaic power station, which is in turn connected to substation B, while the power supply of substation B is led to substation C and substation D respectively. When the line between bay 112 of substation C and bay 111 of substation B, or between bay 112 of substation B and bay 113 of substation A fails, the grid-connected switch to the photovoltaic power station (bay 114 of substation A) needs to be disconnected through coordinated control, and the photovoltaic power station stops grid-connected power generation to prevent it from operating in an islanded manner.

[0068] Connect the open position of the circuit breaker 112 of substation C to the remote input of the optical fiber relay protection optical fiber communication interface device of line 112 (command 1). Figure 4 FIG. 1 is a schematic diagram of an optional power line control method according to an embodiment of the present invention. Figure 4The figure shows a remote input from substation C. The remote input command is transmitted via the 2M multiplexing channel from substation C to substation A. The remote input command is then transmitted via the optical fiber relay protection and optical fiber communication interface device on line 114 of substation A (command 1), connected to the intelligent terminal trip circuit of substation A 114, and thereby tripping the switch of substation A 114. Figure 5 FIG. 1 is a schematic diagram of an optional power line control method according to an embodiment of the present invention. Figure 5 As shown, it represents the remote transmission output of substation A.

[0069] The intermediate substation may also need to be controlled in conjunction with the first substation. Figure 2 As shown, when the switch at substation B 111 trips, the switch at substation A 114 must be tripped. This is achieved through the remote input and output of the optical fiber longitudinal differential line protection device. The GOOSE information indicating the trip position of the circuit breaker at substation B 111 is input via a first intelligent terminal and connected to the remote input of the line protection device 112. Through a dedicated optical fiber channel between substation B 112 and substation A 113, the remote output of the line protection device at substation A 113 sends the GOOSE information to the intelligent terminal at substation A 114, thereby tripping the switch at substation A 114.

[0070] Following the same principle as above, when the switch at substation B 112 trips, the switch at substation A 114 is tripped. The GOOSE information about the trip position of the circuit breaker at substation B 112 is transmitted via the intelligent terminal at 112 to the remote transmission system connected to the line protection device at 112. Similarly, via the dedicated optical fiber channel between substation B 112 and substation A 113, the remote transmission system for the line protection device at substation A 113 sends the GOOSE information to the intelligent terminal at substation A 114, thereby tripping the switch at substation A 114. The tripping of the switch at substation A 113 is directly triggered by sending the GOOSE information about the trip position of the switch at substation A 114 to the intelligent terminal at 114, thereby tripping the switch at substation A 114.

[0071] The above optional implementation achieves at least the following effects: When there is no actual direct link between two substations but they need to jump each other's switches, the cross-station jump protection function is realized through the relay protection optical fiber communication interface device. Protection command information is transmitted independently, and all command information can be transmitted simultaneously. A full-duplex data channel is provided, using optical fiber as the transmission medium to transmit protection command information. The device provides a 2M interface and a 64K interface in the same direction through an external conversion device to multiplex with digital communication equipment (PCM, SDH microwave / optical fiber, etc.), rationally utilizing the existing power grid system structure to achieve real-time protection functions for the power grid.

[0072] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0073] This embodiment also provides a power line control device for implementing the above-described embodiments and preferred implementations. Details already described will not be repeated. As used below, the terms "module" and "device" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0074] According to an embodiment of the present invention, there is also provided an embodiment of a device for implementing a power line control method. Figure 6 is a schematic diagram of a power line control device according to an embodiment of the present invention. Figure 6 As shown, the above-mentioned power line control device includes: a determination module 602, an acquisition module 604, a conversion module 606, and a linkage module 608. The device is described below.

[0075] A determination module 602 is configured to determine a first substation connected to the power station and a second substation that has an electrical connection to the first substation and does not have an optical fiber communication capability;

[0076] an acquisition module 604, connected to the determination module 602, configured to acquire a first switching signal indicating that the circuit breaker of the second substation is opening, wherein the first switching signal is an optical signal;

[0077] The conversion module 606 is connected to the acquisition module 604 and is used to perform photoelectric conversion on the first switch signal to obtain a second switch signal, wherein the second switch signal is an electrical signal;

[0078] The linkage module 608 is connected to the conversion module 606 and is used to use a multiplexing channel to send the second switch signal to the first substation. When the second switch signal indicates a disconnection, the first substation is controlled to cut off the connection with the power station, wherein the multiplexing channel does not occupy the optical fiber communication capacity for signal transmission.

[0079] In a power line control device provided by an embodiment of the present invention, a determination module 602 is provided for determining a first substation connected to a power station and a second substation that has an electrical connection to the first substation but does not have optical fiber communication capability; an acquisition module 604 is connected to the determination module 602 and is used to obtain a first switching signal indicating that a circuit breaker of the second substation has been opened, wherein the first switching signal is an optical signal; a conversion module 606 is connected to the acquisition module 604 and is used to perform photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; and a linkage module 608 is connected to the conversion module 606 and is used to use a multiplexing channel to send the second switching signal to the first substation, and control the first substation to cut off the connection with the power station when the second switching signal indicates a circuit breaker is disconnected, wherein the multiplexing channel does not occupy optical fiber communication capability for signal transmission. The purpose of achieving linkage control between substations without optical fiber communication capability is achieved, and the technical effect of achieving linkage control between substations without optical fiber communication capability is achieved, thereby solving the technical problem of high linkage control limitations existing in the related art.

[0080] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0081] It should be noted that the determination module 602, acquisition module 604, conversion module 606, and linkage module 608 correspond to steps S102 to S108 in the embodiment. The examples and application scenarios implemented by these modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run on a computer terminal.

[0082] It should be noted that the optional or preferred implementation of this embodiment can be found in the relevant description in the embodiment, which will not be repeated here.

[0083] The above-mentioned power line control device may further include a processor and a memory, wherein the determination module 602, the acquisition module 604, the conversion module 606, the linkage module 608, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to implement corresponding functions.

[0084] The processor includes a kernel, which retrieves the corresponding program unit from memory. There can be one or more kernels. Memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0085] An embodiment of the present invention provides a non-volatile storage medium on which a program is stored. When the program is executed by a processor, a power line control method is implemented.

[0086] An embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a program stored in the memory and executable on the processor, wherein when the processor executes the program, the following steps are implemented: determining a first substation connected to a power station, and a second substation that has an electrical connection to the first substation and does not have optical fiber communication capability; obtaining a first switching signal indicating that a circuit breaker of the second substation has been opened, wherein the first switching signal is an optical signal; performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; using a multiplexing channel to transmit the second switching signal to the first substation, and when the second switching signal indicates a circuit breaker is disconnected, controlling the first substation to cut off its connection with the power station, wherein the multiplexing channel does not occupy optical fiber communication capability for signal transmission. The device herein may be a server, a PC, etc.

[0087] The present invention also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having the following method steps: determining a first substation connected to a power station, and a second substation that has an electric power connection with the first substation and does not have optical fiber communication capability; obtaining a first switching signal indicating that a circuit breaker of the second substation executes disconnection, wherein the first switching signal is an optical signal; performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; using a multiplexing channel to send the second switching signal to the first substation, and when the second switching signal indicates a circuit breaker, controlling the first substation to cut off the connection with the power station, wherein the multiplexing channel does not occupy the optical fiber communication capability for signal transmission.

[0088] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0092] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0093] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0094] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0095] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0096] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0097] The above are merely embodiments of the present invention and are not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A power line control method, characterized in that: include: Determining a first substation connected to a power station, and a second substation having an electrical power connection to the first substation and not having optical fiber communication capability; Acquire a first switching signal indicating that the circuit breaker of the second substation is opened, wherein the first switching signal is an optical signal; Performing photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; Using a multiplexing channel, sending the second switching signal to the first substation, and controlling the first substation to cut off the connection with the power station when the second switching signal indicates a disconnection, wherein the multiplexing channel does not occupy optical fiber communication capacity for signal transmission; The first substation is electrically connected to the second substation via an intermediate substation, wherein a first communication connection supporting optical fiber communication exists between the intermediate substation and the first substation, and a second communication connection supporting optical fiber communication exists between the intermediate substation and the second substation; a first predetermined node of the second substation is connected to a second predetermined node of the intermediate substation by the first communication connection, and a third predetermined node of the intermediate substation is connected to a fourth predetermined node of the first substation by the second communication connection; After obtaining the first switching signal indicating that the circuit breaker of the second substation executes the opening, the method further includes: controlling the second substation to send the first switching signal to the intermediate substation through the second communication connection; generating a general object-oriented substation event GOOSE information based on the first switching signal; using a first intelligent terminal set at the intermediate substation to send the GOOSE information generated at the second predetermined node to the third predetermined node, wherein the first intelligent terminal is used for communication interaction between multiple intermediate nodes included in the intermediate substation, and the multiple intermediate nodes include the second predetermined node and the third predetermined node; sending the GOOSE information from the third predetermined node of the intermediate substation to the fourth predetermined node included in the first substation through the second communication connection; using a second intelligent terminal set at the first substation to control the first substation to cut off the connection with the power station based on the GOOSE information received by the fourth predetermined node, wherein the second intelligent terminal is used for communication interaction between multiple first nodes included in the first substation, and the multiple first nodes include the fourth predetermined node; based on the GOOSE information, control the first substation to cut off the connection with the power station.

2. The method according to claim 1, characterized in that The obtaining of a first switching signal indicating that the circuit breaker of the second substation is opened includes: determining a first predetermined node on a power line connecting the second substation to the power station via the first substation; A switching value generated when the circuit breaker at the first predetermined node performs opening is obtained as the first switching signal.

3. The method according to claim 1, characterized in that The multiplexing channel is used in common by multiple substations included in the power grid, and the multiple substations include the first substation and the second substation. The multiple substations interact with each other through corresponding digital communication equipment via a synchronous digital hierarchy (SDH) network, wherein the SDH network is used to transmit signals according to the corresponding transmission rates of the multiple substations.

4. The method according to claim 3, characterized in that The performing photoelectric conversion on the first switching signal to obtain a second switching signal includes: The first switch signal is input into the photoelectric conversion interface for photoelectric conversion using an optical fiber transceiver mode to obtain the second switch signal, wherein the photoelectric conversion interface and the digital communication equipment corresponding to the second substation use an electrical signal transceiver mode with anti-interference capability.

5. The method according to claim 4, characterized in that The electrical signal transmission and reception mode includes a coaxial cable transmission and reception mode or a twisted pair transmission and reception mode.

6. A power line control device, characterized in that: include: a determination module, configured to determine a first substation connected to a power station, and a second substation having an electrical power connection to the first substation and not having an optical fiber communication capability; an acquisition module, configured to acquire a first switching signal indicating that the circuit breaker of the second substation is opened, wherein the first switching signal is an optical signal; a conversion module, configured to perform photoelectric conversion on the first switching signal to obtain a second switching signal, wherein the second switching signal is an electrical signal; a linkage module, configured to use a multiplexing channel to transmit the second switching signal to the first substation, and control the first substation to cut off the connection with the power station when the second switching signal indicates a disconnection, wherein the multiplexing channel does not occupy optical fiber communication capacity for signal transmission; The first substation is electrically connected to the second substation via an intermediate substation, wherein a first communication connection supporting optical fiber communication exists between the intermediate substation and the first substation, and a second communication connection supporting optical fiber communication exists between the intermediate substation and the second substation; a first predetermined node of the second substation is connected to a second predetermined node of the intermediate substation by the first communication connection, and a third predetermined node of the intermediate substation is connected to a fourth predetermined node of the first substation by the second communication connection; The device is also used to: control the second substation to send the first switch signal to the intermediate substation through the second communication connection; generate a general object-oriented substation event GOOSE information based on the first switch signal; use a first intelligent terminal set in the intermediate substation to send the GOOSE information generated at the second predetermined node to the third predetermined node, wherein the first intelligent terminal is used for communication interaction between multiple intermediate nodes included in the intermediate substation, and the multiple intermediate nodes include the second predetermined node and the third predetermined node; send the GOOSE information from the third predetermined node of the intermediate substation to the fourth predetermined node included in the first substation through the second communication connection; use a second intelligent terminal set in the first substation to control the first substation to cut off the connection with the power station based on the GOOSE information received by the fourth predetermined node, wherein the second intelligent terminal is used for communication interaction between multiple first nodes included in the first substation, and the multiple first nodes include the fourth predetermined node; control the first substation to cut off the connection with the power station based on the GOOSE information.

7. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor and executed by the power line control method according to any one of claims 1 to 5.

8. An electronic device, characterized in that: include: One or more processors and a memory, the memory being used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the power line control method according to any one of claims 1 to 5.

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