Debugging method and device of digital substation and computer program product

Abstract

The invention provides a debugging method and device for a digital substation and a computer program product, and the method comprises the steps: controlling debugging software to generate a simulation signal corresponding to a collection signal of a mutual inductor, and transmitting the simulation signal to a merging unit; the control merging unit processes the simulation signal to obtain a first digital simulation signal, and sends the first digital simulation signal to a corresponding protection device or a measurement and control device; the control protection device or the measurement and control device generates a corresponding action instruction according to the first digital simulation signal and sends the action instruction to the intelligent terminal; controlling the intelligent electronic equipment to receive and execute the action instruction transmitted by the intelligent terminal, and sending the action state of the intelligent electronic equipment to the intelligent terminal; and under the condition that the action states of all the intelligent electronic equipment meet the expectation, the debugging of the digital substation is determined to be passed, so that the problem that the secondary system of the substation is not completely debugged in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of substation commissioning technology, and more specifically, to a commissioning method, apparatus, computer-readable storage medium, and computer program product for a digital substation. Background Technology

[0002] With the ever-expanding scale of power systems and the increasing electricity consumption by industry and residents, the safe and stable operation of power grids has become increasingly important; as a crucial link in the power system, the safe and stable operation of substations is even more critical. Currently, digital substation technology has been widely applied in power systems, and compared to traditional substations, digital substations are more intelligent. Based on intelligent primary equipment and networked secondary equipment, information exchange between devices within the substation can be more accurate and convenient. At the same time, the information exchange process within digital substations is relatively complex, which places higher demands on the commissioning work.

[0003] Currently, the commissioning of secondary equipment in power systems is primarily conducted using relay protection testers. This method is prone to incomplete commissioning and omissions, failing to include other secondary equipment in the digital substation secondary system, such as merging units and network switches that distribute data, in the commissioning scope, potentially leaving safety hazards. Summary of the Invention

[0004] The main objective of this application is to provide a commissioning method, apparatus, computer-readable storage medium, and computer program product for a digital substation, so as to at least solve the problem of incomplete commissioning of the secondary system of the substation in the prior art.

[0005] To achieve the above objectives, according to one aspect of this application, a commissioning method for a digital substation is provided. The digital substation includes instrument transformers, a merging unit, an intelligent terminal, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and measurement and control devices. The merging unit is used to synchronously merge the acquired signals from the instrument transformers. The intelligent terminal is used to enable communication between the primary equipment and the secondary equipment. The method includes: controlling commissioning software to generate a simulation signal corresponding to the acquired signals from the instrument transformers and sending the simulation signal to the merging unit; controlling the merging unit to process the simulation signal to obtain a first digital simulation signal and sending the first digital simulation signal to the corresponding protection device or measurement and control device; controlling the protection device or measurement and control device to generate a corresponding action command based on the first digital simulation signal and sending the action command to the intelligent terminal; controlling the intelligent electronic devices to receive and execute the action command transmitted by the intelligent terminal and sending the action status of the intelligent electronic devices to the intelligent terminal; and determining that the digital substation has passed commissioning when the action status of all the intelligent electronic devices meets expectations.

[0006] Optionally, when the commissioning item is the main transformer differential protection commissioning, the commissioning software generates simulation signals corresponding to the acquired signals of the instrument transformer and sends the simulation signals to the merging unit. This includes: controlling the commissioning software to generate high-voltage side current simulation signals, medium-voltage side current simulation signals, and low-voltage side current simulation signals of the main transformer, and sending the high-voltage side current simulation signals, the medium-voltage side current simulation signals, and the low-voltage side current simulation signals to the corresponding merging units; controlling the merging units to process the simulation signals to obtain first digital simulation signals, and sending the first digital simulation signals to the corresponding protection device or the measurement and control device. This includes: controlling each merging unit to process the high-voltage side current simulation signals, the medium-voltage side current simulation signals, and the low-voltage side current simulation signals to obtain three first digital simulation signals, and sending the three first digital simulation signals to the corresponding protection device or the measurement and control device. The digital simulation signals are respectively sent to the corresponding protection devices; the protection devices or the measurement and control devices are controlled to generate corresponding action commands based on the first digital simulation signals, and the action commands are sent to the smart terminal, including: when the current corresponding to the target digital simulation signal is greater than a predetermined current, the protection device corresponding to the target digital simulation signal generates a circuit breaker command and sends the circuit breaker command to the smart terminal, wherein the target digital simulation signal is any one of the first digital simulation signals; the smart electronic device is controlled to receive and execute the action commands transmitted by the smart terminal, and the action status and location information of the smart electronic device are sent to the smart terminal, including: controlling the circuit breaker of the main transformer to receive and execute the circuit breaker command transmitted by the smart terminal, and sending the circuit breaker's circuit breaker status and the circuit breaker's location information to the smart terminal.

[0007] Optionally, the current transformer includes an electronic current transformer. The control and debugging software generates a simulation signal corresponding to the acquisition signal of the current transformer and sends the simulation signal to the merging unit. This includes: the control and debugging software generating a second digital simulation signal corresponding to the digital signal of the electronic current transformer and transmitting the second digital simulation signal to a digital terminal via a wireless network; and controlling the digital terminal to send the second digital simulation signal to the corresponding merging unit via a wired network.

[0008] Optionally, the current transformer includes an electromagnetic current transformer. Control and debugging software generates a simulation signal corresponding to the acquired signal of the current transformer and sends the simulation signal to the merging unit. This includes: controlling the debugging software to generate a third digital simulation signal corresponding to the analog signal of the electromagnetic current transformer and transmitting the third digital simulation signal to an analog terminal via a wireless network; controlling the analog terminal to send the third digital simulation signal to a power amplifier to convert it into a simulated analog signal; and controlling the power amplifier to send the simulated analog signal to the corresponding merging unit via a cable.

[0009] Optionally, controlling the merging unit to process the simulation signal to obtain the first digital simulation signal includes: controlling the merging unit to process the digital simulation signal and / or analog simulation signal to obtain the first digital simulation signal in IEC61850-9-2 frame format.

[0010] Optionally, controlling the debugging software to generate the simulation signal corresponding to the acquired signal of the instrument transformer includes: controlling the debugging software to generate the simulation circuit of the digital substation; performing steady-state and transient simulations on the simulation circuit to generate the simulation signal corresponding to the acquired signal of the instrument transformer.

[0011] Optionally, the debugging system includes a simulation platform and a wireless host. The debugging software runs on the simulation platform, and the wireless host is wirelessly connected to multiple analog terminals and digital terminals respectively. After the debugging software generates the simulation signal corresponding to the acquisition signal of the current transformer, the method further includes: controlling the wireless host to receive the simulation signal corresponding to the acquisition signal of the current transformer generated by the simulation platform through a wired network; and controlling the wireless host to distribute the simulation signal to the corresponding analog terminals and digital terminals under the same clock through the IEEE 1588 time synchronization function.

[0012] According to another aspect of this application, a commissioning device for a digital substation is provided. The digital substation includes instrument transformers, a merging unit, an intelligent terminal, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and measurement and control devices. The merging unit is used to synchronously merge the acquired signals of the instrument transformers. The intelligent terminal is used to realize communication between the primary equipment and the secondary equipment. The device includes: a first control unit, used to control the commissioning software to generate a simulation signal corresponding to the acquired signals of the instrument transformers and send the simulation signal to the merging unit; a second control unit, used to control the merging unit to process the simulation signal to obtain a first digital simulation signal and send the first digital simulation signal to the corresponding protection device or measurement and control device; a third control unit, used to control the protection device or the measurement and control device to generate a corresponding action command based on the first digital simulation signal and send the action command to the intelligent terminal; a fourth control unit, used to control the intelligent electronic devices to receive and execute the action command transmitted by the intelligent terminal and send the action status of the intelligent electronic devices to the intelligent terminal; and a fifth control unit, used to determine that the digital substation has passed commissioning when the action status of all the intelligent electronic devices meets expectations.

[0013] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform any of the methods described.

[0014] According to another aspect of this application, a computer program product is provided, comprising a computer program that, when executed by a processor, implements any of the methods described.

[0015] By applying the technical solution of this application, the above-mentioned commissioning method for digital substations first sends the simulation signal to the protection device through the merging unit, and then sends the action command generated by the protection device to the intelligent electronic device through the intelligent terminal to perform the action, and records the action status of the intelligent electronic device as a performance judgment basis to determine whether the digital substation has been successfully commissioned. This commissioning method not only commissions the performance of the protection device of the secondary system, but also includes the merging unit of the secondary system and the network equipment responsible for digital signal transmission in the commissioning scope, and performs unified commissioning of the generation, distribution and transmission of information in the secondary system, thereby ensuring the integrity of the commissioning to the greatest extent and solving the problem of incomplete commissioning of the secondary system of substations in the prior art. Attached Figure Description

[0016] Figure 1A structural diagram of a digital substation provided in an embodiment according to this application is shown;

[0017] Figure 2 A hardware structure block diagram of a mobile terminal for performing a commissioning method for a digital substation, according to an embodiment of this application, is shown.

[0018] Figure 3 A flowchart illustrating a commissioning method for a digital substation according to an embodiment of this application is shown;

[0019] Figure 4 A flowchart is shown for another commissioning method for a digital substation provided according to an embodiment of this application;

[0020] Figure 5 A schematic diagram of a main transformer differential protection commissioning structure provided according to an embodiment of this application is shown;

[0021] Figure 6 A schematic diagram of a connection method between an electronic current transformer and a merging unit according to an embodiment of this application is shown;

[0022] Figure 7 A schematic diagram of an electronic instrument transformer commissioning method structure provided according to an embodiment of this application is shown;

[0023] Figure 8 A schematic diagram of a connection method between an electromagnetic transformer and a merging unit according to an embodiment of this application is shown;

[0024] Figure 9 A schematic diagram of an electromagnetic transformer commissioning method structure according to an embodiment of this application is shown;

[0025] Figure 10 A diagram illustrating the structure of an IEC61850-9-2 protocol frame according to an embodiment of this application is shown.

[0026] Figure 11 A flowchart illustrating a closed-loop debugging process according to an embodiment of this application is shown;

[0027] Figure 12 A schematic diagram of a closed-loop tuning structure provided according to an embodiment of this application is shown;

[0028] Figure 13 A schematic diagram of a debugging system architecture provided according to an embodiment of this application is shown;

[0029] Figure 14 A schematic diagram of a simulation circuit for a 110kV digital substation according to an embodiment of this application is shown.

[0030] Figure 15 A schematic diagram is shown of an evaluation platform that updates the circuit breaker location interface in real time according to an embodiment of this application;

[0031] Figure 16 A structural block diagram of a commissioning apparatus for a digital substation provided according to an embodiment of this application is shown.

[0032] The above figures include the following reference numerals:

[0033] 102. Processor; 104. Memory; 106. Transmission device; 108. Input / output device. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0037] As described in the background section, the secondary system commissioning of substations in the prior art is incomplete. To solve this technical problem, embodiments of this application provide a commissioning method, apparatus, computer-readable storage medium, and computer program product for a digital substation.

[0038] Digital substations utilize intelligent primary equipment such as electronic instrument transformers and smart switches, along with a three-layer, two-network structure, to achieve digital control and operation functions based on IEC 61850. Compared to traditional substations, digital substations can achieve real-time data and information collection, processing, control, and information transmission during actual operation. Therefore, digital substation technology is increasingly being applied in substation design and construction. Digital substations divide the electrical equipment within the station according to its actual function, into intelligent primary equipment and networked secondary equipment. Furthermore, based on functional logic, digital substations can be divided into a three-layer structure: process layer, bay layer, and station control layer. The three-layer structure is as follows: Figure 1 As shown.

[0039] The process layer is the interface layer for data interaction between primary and secondary equipment after intelligentization. Traditional substations did not have a process layer; this layered structure only appeared after the advent of digital substations. In the process layer, instrument transformers collect voltage and current signals and transmit them to the merging unit in the secondary system via optical fiber. The intelligent terminal is the digital interface between primary and secondary equipment; it can collect the position and status information of primary switches and circuit breakers and receive trip commands from protection devices to drive circuit breaker operation. The online monitoring local acquisition unit enables online monitoring of primary equipment, allowing for early detection of early defects and avoiding unnecessary power outages for maintenance.

[0040] The bay layer encompasses the control equipment within the substation, such as protection devices and measurement and control equipment. Functionally, it is largely the same as a traditional substation. The main difference is that digital substations have a higher degree of digitalization than traditional substations, with internal equipment using more digital interfaces and fiber optics replacing cables to transmit electrical and control signals.

[0041] The station control layer is primarily the substation's backend monitoring system. It enables online monitoring and control of primary equipment in the process layer, and handles anomalies and alarms from secondary equipment. Utilizing high-speed Ethernet, the station control layer updates data from internal substation equipment in real time and can transmit collected data to the dispatch and remote control center, achieving data sharing. Furthermore, while sharing data, it also receives control commands from the dispatch and remote control center to control the substation's bay and process layer equipment.

[0042] IEC 61850, promulgated by the International Electrotechnical Commission (IEC) in 2004, is an internationally unified standard for substation communication networks. IEC 61850 employs object-oriented modeling techniques, establishing a client / server-based model. Through the IEC 61850 communication standard, true system networking of digital substations is realized. Internal equipment in digital substations achieves rapid information exchange and accurate signal transmission through this standard, greatly improving the control level of the substation. IEC 61850 adopts different optimization methods for different communication modes. By introducing different communication methods such as Generic Object Oriented Substation Event (GOOSE), Sampled Measured Value (SMV), and Manufacturing Message Specification (MMS), it meets the diverse communication needs within substations. By establishing a unified Substation Configuration Description (SCD), it enables substations to achieve a unified format and implementation method, and is compatible across different equipment manufacturers. In this mode, the entire substation's structure, layout, and data transmission process can be understood directly through the SCD file.

[0043] The two-layer network comprises the process layer network and the station control layer network. The process layer network includes the SV sampling value network and the GOOSE network. The GOOSE network is an information transmission network in the substation that enables rapid data exchange and status control between bay-level and process-level equipment. The GOOSE network not only ensures reliable data transmission but also replaces traditional hardwiring and input / output circuits in substations for transmitting substation trip signals, switch positions, and interlocking signals. GOOSE networks typically employ a dual configuration (A and B protection sets) at voltage levels above 220kV. The SV network, short for SMV network, enables real-time transmission of sampled signals between bay-level and process-level equipment in the substation. The SV network transmits IEC61850-9-2 network messages. By parsing the 9-2 messages, the merging unit can derive the message source and data entity, enabling subsequent operations. The station control layer network primarily connects bay-level and station control layer equipment, establishing a communication network between these two layers. Using the MMS network, communication and interoperability between intelligent devices from different manufacturers can be achieved. The station control layer network includes a station control layer central switch and bay switches. The central switch enables communication between station control layer devices such as monitoring hosts, data servers, integrated information platforms, protection substations, and five-prevention subsystems. The bay switches enable communication between protection, measurement and control devices and other secondary equipment within the bay. The central switch and bay switches are connected by optical fiber to form the station control layer network.

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0045] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 2 This is a hardware structure block diagram of a mobile terminal for a commissioning method of a digital substation according to an embodiment of the present invention. Figure 2 As shown, a mobile terminal may include one or more ( Figure 2 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 2 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 2 The more or fewer components shown, or having the same Figure 2Different configurations are shown. Memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the commissioning method of the digital substation in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in memory 104, thereby implementing the above-described method. Memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, memory 104 may further include memory remotely located relative to processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. Transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, transmission device 106 includes a Network Interface Controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0046] This embodiment provides a commissioning method for a digital substation that runs on a mobile terminal, computer terminal, or similar computing device. The digital substation includes instrument transformers, a merging unit, a smart terminal, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and measurement and control devices. The merging unit is used to synchronously merge the signals collected by the instrument transformers. The smart terminal is used to realize communication between the primary equipment and the secondary equipment. It should be noted that the steps shown in the flowchart can be executed in a computer system such as a set of computer-executable instructions. Although the logical order is shown in the flowchart, in some cases, the steps shown can be executed in a different order than that shown here.

[0047] Figure 3 This is a flowchart of a commissioning method for a digital substation according to an embodiment of this application. Figure 3 As shown, the method includes the following steps:

[0048] Step S201: The control debugging software generates a simulation signal corresponding to the acquisition signal of the aforementioned current transformer, and sends the simulation signal to the aforementioned merging unit;

[0049] Step S202: Control the above-mentioned merging unit to process the above-mentioned simulation signal to obtain the first digital simulation signal, and send the above-mentioned first digital simulation signal to the corresponding above-mentioned protection device or the above-mentioned measurement and control device.

[0050] Step S203: Control the above-mentioned protection device or the above-mentioned measurement and control device to generate corresponding action commands based on the above-mentioned first digital simulation signal, and send the above-mentioned action commands to the above-mentioned smart terminal;

[0051] Step S204: Control the above-mentioned intelligent electronic device to receive and execute the above-mentioned action instructions transmitted by the above-mentioned intelligent terminal, and send the action status of the above-mentioned intelligent electronic device to the above-mentioned intelligent terminal.

[0052] Step S205: If the above-mentioned operating states of all the above-mentioned intelligent electronic devices meet the expectations, it is determined that the above-mentioned digital substation has passed the commissioning.

[0053] In the above-mentioned commissioning method for digital substations, the simulation signal is first sent to the protection device through the merging unit, and then the action command generated by the protection device is sent to the intelligent electronic device through the intelligent terminal to perform the action. The action status of the intelligent electronic device is recorded as a performance judgment basis to determine whether the digital substation has been successfully commissioned. This commissioning method not only commissions the performance of the protection device of the secondary system, but also includes the merging unit of the secondary system and the network equipment responsible for digital signal transmission in the commissioning scope. It performs unified commissioning on the generation, distribution and transmission of information in the secondary system, thereby ensuring the integrity of the commissioning to the greatest extent and solving the problem of incomplete commissioning of the secondary system of substations in the existing technology.

[0054] It is important to note that when using this method for commissioning, the object of commissioning is no longer a single secondary system device, but rather all secondary devices within the commissioning interval are considered as the object of commissioning, while maintaining the integrity of the information loops of the secondary devices within that interval during the commissioning process. First, the data source during the commissioning process comes from the voltage and current signals simulated by the commissioning software. The simulation results are sent to the wireless host, which then transmits the signals to the analog / digital terminals via wireless transmission technology. Next, the terminal forwards the received data to the MergeUnit (MU) in the interval where the device under commissioning is located. The MergeUnit merges and processes the received data, and transmits the processed digital signal via optical fiber to the protection and control equipment of the secondary system. Finally, the protection and control equipment generates corresponding action commands based on the protection settings set in the equipment and sends these commands to the intelligent terminal. The intelligent terminal processes the action commands, sends trip commands to the IED to activate it, and after activation, outputs the action signal and circuit breaker location information, returning it to the intelligent terminal and the backend. The commissioning system also receives the returned circuit breaker location information and performs an evaluation. Through the above process, the overall commissioning process of the secondary system of the digital substation is completed. This commissioning process encompasses the simulation, transmission, distribution, and reception of signals from the digital substation's instrument transformers, maximizing system-level commissioning of the secondary system. The entire commissioning process can be further represented as follows: Figure 4 As shown.

[0055] To achieve the commissioning of the main transformer differential protection, in an optional implementation, when the commissioning item is the commissioning of the main transformer differential protection, step S201 includes: step S2011, controlling the commissioning software to generate the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal of the main transformer, and sending the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal to the corresponding merging unit; step S202 includes: step S2021, controlling each of the merging units to process the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal to obtain three first numbers. The first digital simulation signal is sent to the corresponding protection device. Step S203 includes: Step S2031, when the current corresponding to the target digital simulation signal is greater than the predetermined current, the protection device corresponding to the target digital simulation signal generates a circuit breaker command and sends the circuit breaker command to the smart terminal. The target digital simulation signal is any one of the first digital simulation signals. Step S204 includes: Step S2041, controlling the circuit breaker of the main transformer to receive and execute the circuit breaker command transmitted by the smart terminal, and sending the circuit breaker's circuit breaker status and the circuit breaker's location information to the smart terminal.

[0056] In the above embodiments, the signal received by the MU in the above debugging method is issued by the debugging software. The debugging software can issue different simulation data according to the debugging work required. For the measuring device, the required amplitude of sine wave data can be directly configured. For the protection device, the type of fault to be simulated can be set, and transient data can be obtained by simulating the fault. Because the fault in the station occurs for a very short time, the electromagnetic transient simulation method is used to simulate the electrical fault, thereby issuing an overcurrent signal that can trigger the protection device to operate. When the main transformer differential protection needs to be debugged, the above debugging process is followed, and its debugging principle is as follows: Figure 5 As shown.

[0057] First, simulation data is applied to the high, medium, and low voltage merging units of the main transformer using three terminals. Then, each merging unit processes the received data and sends the processed data to the corresponding protection and monitoring devices and other secondary equipment. Finally, if the data received by the protection and monitoring devices triggers the main transformer differential protection, the protection device sends a trip signal to the intelligent terminal. The intelligent terminal then drives the circuit breaker to operate and returns the collected circuit breaker location information to the main transformer secondary system and the station control layer monitoring backend. Simultaneously, since the principle of the main transformer differential protection is based on circulating current, the polarity of the current transformer is also required during commissioning. During commissioning, the polarity of a current transformer can be reversed to output a current signal with the opposite polarity to that of the current transformer on that side of the main transformer, and the differential protection can be observed to see if it operates. When performing secondary system commissioning work that requires cross-bay commissioning, such as bus differential protection or line differential protection, the above commissioning method can be followed. For conventional single-bay secondary system commissioning, only the commissioning method of one side of the main transformer commissioning process needs to be followed.

[0058] It should also be noted that the digital substation integrated commissioning method has designed two signal transmission methods to address the different output methods of electronic and electromagnetic instrument transformers. This allows for flexible adaptation to the actual instrument transformer type at the commissioning site, thus meeting different commissioning requirements.

[0059] To achieve digital signal simulation and debugging, in one optional implementation, the aforementioned current transformer includes an electronic current transformer, and step S201 includes:

[0060] Step S2012: The control debugging software generates a second digital simulation signal corresponding to the digital signal of the above-mentioned electronic current transformer, and transmits the second digital simulation signal to the digital terminal through a wireless network.

[0061] Step S2013: Control the digital terminal to send the second digital simulation signal to the corresponding merging unit via a wired network.

[0062] In the above embodiments, the electronic instrument transformer merging unit directly transmits digital signals and can only transmit sampling signals according to a specific protocol. Currently, there are two protocol interfaces for the input of the electronic instrument transformer merging unit: one uses the manufacturer's proprietary protocol as a customized interface; the other uses the FT3 frame format in the IEC60044-8 standard as the input interface of the merging unit. This method can achieve consistency in the interfaces of equipment from different manufacturers and has greater compatibility. Figure 6The diagram shows the connection between the electronic instrument transformer and the merging unit. For digital substations using electronic instrument transformers, the commissioning method proposed in this section involves directly sending digital signals from a digital terminal to the merging unit. The digital terminal integrates a module that converts the digital signal into an FT3 signal format using Manchester encoding. The structure of the electronic instrument transformer commissioning method is as follows: Figure 7 As shown. Using Figure 8 The structure shown allows for the debugging of secondary equipment whose signal source is an electronic instrument transformer within the debugging interval.

[0063] To achieve analog signal simulation debugging, in one optional implementation, the aforementioned current transformer includes an electromagnetic current transformer, and step S201 includes:

[0064] Step S2014: The control debugging software generates a third digital simulation signal corresponding to the analog signal of the electromagnetic transformer, and transmits the third digital simulation signal to the analog terminal via a wireless network.

[0065] Step S2015: Control the analog terminal to send the third digital simulation signal to the power amplifier to convert it into an analog signal.

[0066] Step S2016: Control the power amplifier to send the simulated signal to the corresponding merging unit via a cable.

[0067] In the above embodiments, some digital substations still use electromagnetic instrument transformers for signal acquisition, and some even use electromagnetic instrument transformers for signal acquisition throughout the entire station. The connection method between the electromagnetic instrument transformer and the merging unit is as follows: Figure 8 As shown. The electromagnetic instrument transformer merging unit can directly receive the acquired analog voltage and current signals without external protocol configuration. The debugging method proposed in this section addresses this situation by using an "analog terminal + power amplifier" approach to transmit analog signals to the merging unit. The simulation data received by the analog terminal is still a digital signal, but after amplification by the power amplifier, it can be converted into analog voltage and current signals and directly transmitted to the corresponding merging unit. The structure of the electromagnetic instrument transformer debugging method is as follows. Figure 9 As shown. Figure 9 As shown, when debugging the secondary equipment in a digital substation that uses electromagnetic current transformers to collect signals, the above-mentioned debugging structure can be used directly for on-site testing.

[0068] To standardize signal formats, in one optional implementation, step S202 includes:

[0069] Step S2022: Control the above-mentioned merging unit to process the digital simulation signal and / or analog simulation signal to obtain the above-mentioned first digital simulation signal in IEC61850-9-2 frame format.

[0070] In the above embodiments, the types of instrument transformers used in each digital substation and even within the same digital substation are not necessarily the same; there are two types: electromagnetic instrument transformers and electronic instrument transformers. Electromagnetic instrument transformers output analog voltage and current signals via cables, while electronic instrument transformers output digital voltage and current signals via optical fibers. The merging unit uses the IEC61850-9-2 protocol as a unified standard for data transmission between the merging unit and secondary system protection and control equipment. The IEC61850-9-2 protocol enables communication between secondary equipment from different manufacturers and the merging unit. Due to differences in substation structure and connection methods, some voltage levels may have cascaded merging units. Therefore, during commissioning, data cannot be directly transmitted to the merging unit; signals must be transmitted to protection and measurement equipment according to the 9-2 protocol. Since each intelligent device has corresponding device configuration information in the SCD file, before commissioning begins, the relevant configuration information of the device to be commissioned needs to be pre-set in the commissioning system simulation platform according to the device information in the IEC61850-9-2 protocol to ensure successful data transmission. The IEC61850-9-2 output protocol frame structure is as follows: Figure 10 As shown in the diagram. The destination address in the physical MAC address is the physical address of the receiving data device, and each device's physical address is unique. The priority flag contains the priority of the transmitted data; 7 indicates the highest priority. The priority flag also includes the VLAN ID of the local area network where the receiving device is located. The APPID identifies the data source ID, and a unique sampling value control block can be determined based on the APPID. The APDU contains the SVID and the transmitted data information. The SVID uniquely identifies the ID of the digital substation device in the SCD file.

[0071] Currently, the commissioning methods for digital substations are still at the stage of single-device performance commissioning. Moreover, the commissioning technology for single devices is still in the open-loop commissioning stage, and cannot achieve closed-loop commissioning of the overall performance of the substation and the system level.

[0072] According to such Figure 1As shown in the three-layer, two-network structure of the digital substation, the commissioning method proposed in this invention can directly send simulation data to the protection and monitoring device through the merging unit. The protection and monitoring device then generates corresponding actions based on the received data and transmits the action commands to the intelligent terminal. Simultaneously, it also sends the information from the protection device to the process layer network for use by secondary equipment in other bay layers. Conversely, secondary equipment in the bay layer can also receive data from process layer equipment through the process layer network. The process layer network enables communication between bay layer equipment and process layer equipment, thus providing the physical basis for closed-loop commissioning.

[0073] For example, a substation will perform secondary system commissioning on line A. First, a corresponding simulation circuit model is built in the commissioning system, and a single-phase transient ground fault is set at a designated location on line A. Then, the simulation platform sends the transient data obtained from the simulation to the merging unit of the line bay. The merging unit processes the data and sends it to the corresponding secondary equipment in the bay. After receiving the simulated preset fault result, the protection and monitoring device in the bay will generate the corresponding fault action command. Finally, the protection and monitoring device will send the circuit breaker action command to the smart terminal through the GOOSE network. The smart terminal triggers the circuit breaker action. After the circuit breaker action is completed, it will again transmit the circuit breaker location information to the GOOSE network through the smart terminal, thereby transmitting the circuit breaker location information to the bay-level equipment and the background monitoring system.

[0074] The closed-loop commissioning method receives the circuit breaker location information returned by the intelligent terminal in the GOOSE network after the circuit breaker's operation, and updates and displays the corresponding circuit breaker location in the simulation platform. Based on the preset fault and circuit breaker location information, system-level closed-loop commissioning is performed on the secondary system. The closed-loop commissioning flowchart is as follows: Figure 11 As shown. According to Figure 11 It can be seen that after the simulation results of the preset fault are issued, the circuit breaker's operating behavior and the function of the secondary system protection devices can be directly evaluated based on the circuit breaker location information message. Analysis based on the evaluation results allows for system debugging of the digital substation's protection and monitoring devices, other secondary system equipment, communication links, switches, etc., thereby completing the closed-loop debugging process. Figure 12 This further demonstrates the closed-loop commissioning structure of the integrated commissioning test method for digital substations. The commissioning system established by the integrated commissioning method for digital substations mainly consists of a commissioning system simulation platform, a wireless host, and analog / digital terminals. Figure 13 To debug the system's composition and structure.

[0075] To achieve signal simulation, in one optional implementation, step S201 includes:

[0076] Step S2017: Control the above-mentioned debugging software to generate the simulation circuit of the above-mentioned digital substation;

[0077] Step S2018: Perform steady-state and transient simulations on the above simulation circuit to generate the above simulation signal corresponding to the acquisition signal of the above current transformer.

[0078] In the above embodiments, the commissioning system simulation platform used in the above method is implemented using PSCAD electromagnetic transient simulation software. Due to the necessity of field use, and for ease of use and to enable commissioning work in different digital substations, the software needs to be operated and run on a mobile PC. Therefore, the software environment for the commissioning system simulation platform is a Windows system. The commissioning system simulation platform can build a corresponding circuit model based on the substation's primary wiring diagram and complete the simulation calculation process. The simulation platform can set the steady-state voltage and current values ​​required for measurement tests, as well as the transient fault voltage and current values ​​for protection tests, according to the needs of field commissioning. Fault debugging can set various fault types, such as common single-phase transient faults, two-phase inter-phase faults, and three-phase permanent faults. Figure 14 The image shows the simulation interface of a 110kV digital substation built using the commissioning system simulation platform. The platform can perform steady-state and transient simulations on the built circuit model and control the commissioning process and simulation data output. After all physical wiring connections are completed, all operations of the entire commissioning process can be completed within the platform, effectively improving commissioning efficiency.

[0079] To achieve clock uniformity, in one optional implementation, the debugging system includes a simulation platform and a wireless host. The debugging software runs on the simulation platform, and the wireless host is wirelessly connected to multiple analog and digital terminals. After the debugging software generates the simulation signal corresponding to the acquired signal of the current transformer, the method further includes:

[0080] Step S301: Control the wireless host to receive the simulation signal corresponding to the acquisition signal of the current transformer generated by the simulation platform through the wired network.

[0081] Step S302: Control the wireless host to distribute the simulated signal to the corresponding analog terminal and digital terminal under the same clock through the IEEE1588 time synchronization function.

[0082] In the above implementation, as shown in the schematic diagram of the debugging system, the debugging simulation platform sends the simulated data to the wireless host. The wireless host and the debugging simulation software directly connect via a network cable to achieve data transmission. Due to the necessity of debugging, when the physical distance between the devices being debugged is too large, or when debugging multiple sets of protection devices together, using physical wiring to achieve signal transmission between the host and each terminal would make the debugging process more cumbersome and the wiring method very complex. Therefore, during the debugging process, wireless transmission is used between the wireless host and each terminal to achieve signal transmission, and it is necessary to ensure that the clocks of all devices are synchronized.

[0083] The wireless host acts as a relay station between the terminal and the simulation platform, enabling signal relay and control, and can connect to multiple terminals simultaneously. The wireless host receives simulation results from the debugging system's simulation platform via a network cable, and synchronizes the clocks of each terminal with the wireless host using the IEEE 1588 time synchronization function, ensuring that the final transmitted simulation results are under the same clock, thus enabling the simultaneous execution of multiple debugging tasks.

[0084] The terminals mentioned above refer to analog / digital terminals, whose function is to simulate the voltage and current transformers of a digital substation. Currently, some digital substations are newly built, while a large portion are upgraded from traditional substations, still using electromagnetic transformers. Therefore, depending on the different data interface requirements, when the tested bay uses electronic transformers to collect voltage and current signals, a digital terminal will be used to simulate the transformers and output the data in FT3 frame format during the commissioning process. When the tested bay uses traditional electromagnetic transformers to collect voltage and current signals, an analog terminal will be used to simulate the transformers and output the data during the commissioning process.

[0085] Both the wireless host and the terminal have a fixed IP address. Using a Client / Server model, one host can connect to multiple terminals, allowing for simultaneous debugging of multiple protection devices across multiple intervals. The debugging system simulation platform can control multiple terminals through the wireless host.

[0086] When commissioning differential protection on a transformer, simulation data needs to be applied simultaneously to both or all three sides of the transformer to simulate the voltage and current signals on each side, thus completing the differential protection commissioning. The same applies to cross-bay joint commissioning. Therefore, the commissioning system simulation platform utilizes a wireless host to control multiple terminals, enabling convenient and efficient simultaneous commissioning of equipment in multiple bays.

[0087] In response to the inconsistency in the types of instrument transformers used in digital substations, the commissioning method proposed in this invention designs two commissioning strategies based on the different data types of the instrument transformer outputs, in order to complete the commissioning work of digital substations.

[0088] For electronic instrument transformers, digital terminals will be used for testing during commissioning. The sampled values ​​of secondary equipment and the output data of the merging unit in the digital substation adopt the IEC61850-9-2 frame format. Therefore, when commissioning secondary equipment with electronic instrument transformers as the signal source, if the signal can be directly transmitted to the merging unit for commissioning, the data in the digital terminal can be transmitted to the merging unit via optical fiber to complete the commissioning task. If data forwarding and distribution cannot be performed through the merging unit, the relevant equipment information must be obtained from the substation SCD file according to the 9-2 message format. After configuring the relevant information, the data in the digital terminal can be directly transmitted to the secondary equipment.

[0089] For electromagnetic current transformers, an analog terminal and power amplifier are used in combination for debugging. When debugging the transmission method of an electromagnetic current transformer, the configuration scheme used for electronic current transformers is not required. Simply amplify the simulated voltage and current signals or custom voltage and current sinusoidal signals through the power amplifier and send the amplified signals to the corresponding data interface of the merging unit.

[0090] For digital substations using a combination of electronic and electromagnetic instrument transformers, the two systems can be combined into a hybrid mode for simultaneous commissioning. By receiving and parsing GOOSE messages during commissioning, the current circuit breaker position status can be determined. Based on the dataset information in the messages and verifying it against the information of the protection devices in the SCD file, the secondary equipment in the specific commissioning bay can be located. According to the data order in the SCD file, the tripping information order in the GOOSE message dataset can be obtained, ultimately acquiring the signal after the circuit breaker trips within that bay. By receiving and parsing the position message information after the circuit breaker's action in the GOOSE network, the evaluation platform in the commissioning system will update and display the corresponding circuit breaker position information, visually indicating the current circuit breaker position status. The update interface is as follows: Figure 15 As shown, circuit breakers indicated by red are in the closed state, while those indicated by green are in the open state. The evaluation platform displays the acquired circuit breaker location information in real time, indicating whether the current circuit breaker position is consistent with the expected results of the commissioning work. The commissioning personnel will judge the correctness of the secondary system behavior based on the evaluation results, and then decide on subsequent commissioning operations.

[0091] This application also provides a commissioning device for a digital substation. It should be noted that this commissioning device can be used to execute the commissioning method for digital substations provided in this application. This device is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0092] The following describes the commissioning device for a digital substation provided in the embodiments of this application. The digital substation includes instrument transformers, merging units, intelligent terminals, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and measurement and control devices. The merging unit is used to synchronously merge the signals collected by the instrument transformers, and the intelligent terminal is used to realize communication between the primary equipment and the secondary equipment.

[0093] Figure 16 This is a structural block diagram of a commissioning device for a digital substation according to an embodiment of this application. Figure 16 As shown, the device includes:

[0094] The first control unit 10 is used to control the debugging software to generate the simulation signal corresponding to the acquisition signal of the aforementioned current transformer, and to send the simulation signal to the aforementioned merging unit.

[0095] The second control unit 20 is used to control the merging unit to process the simulation signal to obtain the first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the measurement and control device.

[0096] The third control unit 30 is used to control the protection device or the measurement and control device to generate corresponding action commands based on the first digital simulation signal and send the action commands to the smart terminal.

[0097] The fourth control unit 40 is used to control the intelligent electronic device to receive and execute the action instructions transmitted by the intelligent terminal, and to send the action status of the intelligent electronic device to the intelligent terminal.

[0098] The fifth control unit 50 is used to determine that the digital substation has passed commissioning if the above-mentioned operating states of all the above-mentioned intelligent electronic devices meet the expectations.

[0099] In the aforementioned commissioning device for digital substations, the simulation signal is first sent to the protection device via the merging unit. Then, the action command generated by the protection device is sent to the intelligent electronic device via the intelligent terminal to perform the action. The action status of the intelligent electronic device is recorded as a performance judgment basis to determine whether the digital substation has passed commissioning. This commissioning method not only commissions the performance of the protection device of the secondary system, but also includes the merging unit of the secondary system and the network equipment responsible for digital signal transmission in the commissioning scope. It performs unified commissioning on the generation, distribution, and transmission of information in the secondary system, thereby ensuring the integrity of the commissioning to the greatest extent and solving the problem of incomplete commissioning of the secondary system of substations in the prior art.

[0100] It is important to note that when using this method for commissioning, the object of commissioning is no longer a single secondary system device, but rather all secondary devices within the commissioning interval are considered as the object of commissioning, while maintaining the integrity of the information loops of the secondary devices within that interval during the commissioning process. First, the data source during the commissioning process comes from the voltage and current signals simulated by the commissioning software. The simulation results are sent to the wireless host, which then transmits the signals to the analog / digital terminals via wireless transmission technology. Next, the terminal forwards the received data to the MergeUnit (MU) in the interval where the device under commissioning is located. The MergeUnit merges and processes the received data, and transmits the processed digital signal via optical fiber to the protection and control equipment of the secondary system. Finally, the protection and control equipment generates corresponding action commands based on the protection settings set in the equipment and sends these commands to the intelligent terminal. The intelligent terminal processes the action commands, sends trip commands to the IED to activate it, and after activation, outputs the action signal and circuit breaker location information, returning it to the intelligent terminal and the backend. The commissioning system also receives the returned circuit breaker location information and performs an evaluation. Through the above process, the overall commissioning process of the secondary system of the digital substation is completed. This commissioning process encompasses the simulation, transmission, distribution, and reception of signals from the digital substation's instrument transformers, maximizing system-level commissioning of the secondary system. The entire commissioning process can be further represented as follows: Figure 4 As shown.

[0101] To achieve the commissioning of the main transformer differential protection, in one optional embodiment, when the commissioning item is the commissioning of the main transformer differential protection, the first control unit includes: a first control module, used to control the commissioning software to generate the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal of the main transformer, and to send the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal to the corresponding merging unit; the second control unit includes: a second control module, used to control each of the merging units to process the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal to obtain three simulation signals. The third control unit includes a third control module, which generates a circuit breaker command for the protection device corresponding to the target digital simulation signal when the current corresponding to the target digital simulation signal is greater than a predetermined current, and sends the circuit breaker command to the smart terminal. The target digital simulation signal is any one of the first digital simulation signals. The fourth control unit includes a fourth control module, which controls the circuit breaker of the main transformer to receive and execute the circuit breaker command transmitted by the smart terminal, and sends the circuit breaker's circuit breaker status and the circuit breaker's location information to the smart terminal.

[0102] In the above embodiments, the signal received by the MU in the above debugging method is issued by the debugging software. The debugging software can issue different simulation data according to the debugging work required. For the measuring device, the required amplitude of sine wave data can be directly configured. For the protection device, the type of fault to be simulated can be set, and transient data can be obtained by simulating the fault. Because the fault in the station occurs for a very short time, the electromagnetic transient simulation method is used to simulate the electrical fault, thereby issuing an overcurrent signal that can trigger the protection device to operate. When the main transformer differential protection needs to be debugged, the above debugging process is followed, and its debugging principle is as follows: Figure 5 As shown.

[0103] First, simulation data is applied to the high, medium, and low voltage merging units of the main transformer using three terminals. Then, each merging unit processes the received data and sends the processed data to the corresponding protection and monitoring devices and other secondary equipment. Finally, if the data received by the protection and monitoring devices triggers the main transformer differential protection, the protection device sends a trip signal to the intelligent terminal. The intelligent terminal then drives the circuit breaker to operate and returns the collected circuit breaker location information to the main transformer secondary system and the station control layer monitoring backend. Simultaneously, since the principle of the main transformer differential protection is based on circulating current, the polarity of the current transformer is also required during commissioning. During commissioning, the polarity of a current transformer can be reversed to output a current signal with the opposite polarity to that of the current transformer on that side of the main transformer, and the differential protection can be observed to see if it operates. When performing secondary system commissioning work that requires cross-bay commissioning, such as bus differential protection or line differential protection, the above commissioning method can be followed. For conventional single-bay secondary system commissioning, only the commissioning method of one side of the main transformer commissioning process needs to be followed.

[0104] It should also be noted that the digital substation integrated commissioning method has designed two signal transmission methods to address the different output methods of electronic and electromagnetic instrument transformers. This allows for flexible adaptation to the actual instrument transformer type at the commissioning site, thus meeting different commissioning requirements.

[0105] To achieve digital signal simulation and debugging, in one optional implementation, the aforementioned current transformer includes an electronic current transformer, and the aforementioned first control unit includes:

[0106] The fifth control module is used to control the debugging software to generate the second digital simulation signal corresponding to the digital signal of the above-mentioned electronic instrument transformer, and to transmit the second digital simulation signal to the digital terminal through the wireless network.

[0107] The sixth control module is used to control the digital terminal to send the second digital simulation signal to the corresponding merging unit via a wired network.

[0108] In the above embodiments, the electronic instrument transformer merging unit directly transmits digital signals and can only transmit sampling signals according to a specific protocol. Currently, there are two protocol interfaces for the input of the electronic instrument transformer merging unit: one uses the manufacturer's proprietary protocol as a customized interface; the other uses the FT3 frame format in the IEC60044-8 standard as the input interface of the merging unit. This method can achieve consistency in the interfaces of equipment from different manufacturers and has greater compatibility. Figure 6The diagram shows the connection between the electronic instrument transformer and the merging unit. For digital substations using electronic instrument transformers, the commissioning method proposed in this section involves directly sending digital signals from a digital terminal to the merging unit. The digital terminal integrates a module that converts the digital signal into an FT3 signal format using Manchester encoding. The structure of the electronic instrument transformer commissioning method is as follows: Figure 7 As shown. Using Figure 8 The structure shown allows for the debugging of secondary equipment whose signal source is an electronic instrument transformer within the debugging interval.

[0109] To achieve analog signal simulation debugging, in one optional implementation, the aforementioned current transformer includes an electromagnetic current transformer, and the aforementioned first control unit includes:

[0110] The seventh control module is used to control the debugging software to generate the third digital simulation signal corresponding to the analog signal of the electromagnetic transformer, and to transmit the third digital simulation signal to the analog terminal through the wireless network.

[0111] The eighth control module is used to control the analog terminal to send the third digital simulation signal to the power amplifier to convert it into an analog signal.

[0112] The ninth control module is used to control the power amplifier to send the simulated signal to the corresponding merging unit via a cable.

[0113] In the above embodiments, some digital substations still use electromagnetic instrument transformers for signal acquisition, and some even use electromagnetic instrument transformers for signal acquisition throughout the entire station. The connection method between the electromagnetic instrument transformer and the merging unit is as follows: Figure 8 As shown. The electromagnetic instrument transformer merging unit can directly receive the acquired analog voltage and current signals without external protocol configuration. The debugging method proposed in this section addresses this situation by using an "analog terminal + power amplifier" approach to transmit analog signals to the merging unit. The simulation data received by the analog terminal is still a digital signal, but after amplification by the power amplifier, it can be converted into analog voltage and current signals and directly transmitted to the corresponding merging unit. The structure of the electromagnetic instrument transformer debugging method is as follows. Figure 9 As shown. Figure 9 As shown, when debugging the secondary equipment in a digital substation that uses electromagnetic current transformers to collect signals, the above-mentioned debugging structure can be used directly for on-site testing.

[0114] To standardize the signal format, in one optional implementation, the second control unit includes:

[0115] The tenth control module is used to control the above-mentioned merging unit to process the digital simulation signal and / or analog simulation signal to obtain the above-mentioned first digital simulation signal in IEC61850-9-2 frame format.

[0116] In the above embodiments, the types of instrument transformers used in each digital substation and even within the same digital substation are not necessarily the same; there are two types: electromagnetic instrument transformers and electronic instrument transformers. Electromagnetic instrument transformers output analog voltage and current signals via cables, while electronic instrument transformers output digital voltage and current signals via optical fibers. The merging unit uses the IEC61850-9-2 protocol as a unified standard for data transmission between the merging unit and secondary system protection and control equipment. The IEC61850-9-2 protocol enables communication between secondary equipment from different manufacturers and the merging unit. Due to differences in substation structure and connection methods, some voltage levels may have cascaded merging units. Therefore, during commissioning, data cannot be directly transmitted to the merging unit; signals must be transmitted to protection and measurement equipment according to the 9-2 protocol. Since each intelligent device has corresponding device configuration information in the SCD file, before commissioning begins, the relevant configuration information of the device to be commissioned needs to be pre-set in the commissioning system simulation platform according to the device information in the IEC61850-9-2 protocol to ensure successful data transmission. The IEC61850-9-2 output protocol frame structure is as follows: Figure 10 As shown in the diagram. The destination address in the physical MAC address is the physical address of the receiving data device, and each device's physical address is unique. The priority flag contains the priority of the transmitted data; 7 indicates the highest priority. The priority flag also includes the VLAN ID of the local area network where the receiving device is located. The APPID identifies the data source ID, and a unique sampling value control block can be determined based on the APPID. The APDU contains the SVID and the transmitted data information. The SVID uniquely identifies the ID of the digital substation device in the SCD file.

[0117] Currently, the commissioning methods for digital substations are still at the stage of single-device performance commissioning. Moreover, the commissioning technology for single devices is still in the open-loop commissioning stage, and cannot achieve closed-loop commissioning of the overall performance of the substation and the system level.

[0118] According to such Figure 1As shown in the three-layer, two-network structure of the digital substation, the commissioning method proposed in this invention can directly send simulation data to the protection and monitoring device through the merging unit. The protection and monitoring device then generates corresponding actions based on the received data and transmits the action commands to the intelligent terminal. Simultaneously, it sends the information from the protection device to the process layer network for use by secondary equipment in other bay layers. Conversely, secondary equipment in the bay layer can also receive data from process layer equipment through the process layer network. The process layer network enables communication between bay layer equipment and process layer equipment, thus providing the physical basis for closed-loop commissioning. For example, the substation will perform secondary system commissioning work on line A. First, a corresponding simulation circuit model is built in the debugging system, and a single-phase transient ground fault is set at a designated location on line A. Then, the simulation platform sends the transient data obtained from the simulation to the merging unit of the line bay. The merging unit processes the data and sends it to the corresponding secondary equipment in the bay. After receiving the simulated preset fault result, the protection and monitoring device in the bay will generate the corresponding fault action command. Finally, the protection and monitoring device will send the circuit breaker action command to the smart terminal through the GOOSE network. The smart terminal triggers the circuit breaker action. After the circuit breaker action is completed, it will again transmit the circuit breaker location information to the GOOSE network through the smart terminal, thereby transmitting the circuit breaker location information to the bay-level equipment and the background monitoring system.

[0119] The closed-loop commissioning method receives the circuit breaker location information returned by the intelligent terminal in the GOOSE network after the circuit breaker's operation, and updates and displays the corresponding circuit breaker location in the simulation platform. Based on the preset fault and circuit breaker location information, system-level closed-loop commissioning is performed on the secondary system. The closed-loop commissioning flowchart is as follows: Figure 11 As shown. According to Figure 11 It can be seen that after the simulation results of the preset fault are issued, the circuit breaker's operating behavior and the function of the secondary system protection devices can be directly evaluated based on the circuit breaker location information message. Analysis based on the evaluation results allows for system debugging of the digital substation's protection and monitoring devices, other secondary system equipment, communication links, switches, etc., thereby completing the closed-loop debugging process. Figure 12 This further demonstrates the closed-loop commissioning structure of the integrated commissioning test method for digital substations. The commissioning system established by the integrated commissioning method for digital substations mainly consists of a commissioning system simulation platform, a wireless host, and analog / digital terminals. Figure 13 To debug the system's composition and structure.

[0120] To achieve signal simulation, in one optional implementation, the first control unit includes:

[0121] The eleventh control module is used to control the above-mentioned debugging software to generate the simulation circuit of the above-mentioned digital substation.

[0122] The twelfth control module is used to perform steady-state and transient simulations on the above simulation circuit to generate the above simulation signal corresponding to the acquisition signal of the above transformer.

[0123] In the above embodiments, the commissioning system simulation platform used in the above method is implemented using PSCAD electromagnetic transient simulation software. Due to the necessity of field use, and for ease of use and to enable commissioning work in different digital substations, the software needs to be operated and run on a mobile PC. Therefore, the software environment for the commissioning system simulation platform is a Windows system. The commissioning system simulation platform can build a corresponding circuit model based on the substation's primary wiring diagram and complete the simulation calculation process. The simulation platform can set the steady-state voltage and current values ​​required for measurement tests, as well as the transient fault voltage and current values ​​for protection tests, according to the needs of field commissioning. Fault debugging can set various fault types, such as common single-phase transient faults, two-phase inter-phase faults, and three-phase permanent faults. Figure 14 The image shows the simulation interface of a 110kV digital substation built using the commissioning system simulation platform. The platform can perform steady-state and transient simulations on the built circuit model and control the commissioning process and simulation data output. After all physical wiring connections are completed, all operations of the entire commissioning process can be completed within the platform, effectively improving commissioning efficiency.

[0124] To achieve clock uniformity, in one optional implementation, the debugging system includes a simulation platform and a wireless host. The debugging software runs on the simulation platform, and the wireless host is wirelessly connected to multiple analog and digital terminals. The device further includes:

[0125] The sixth control unit is used to control the wireless host to receive the simulation signal corresponding to the acquisition signal of the aforementioned current transformer generated by the simulation platform through a wired network after the control debugging software generates the simulation signal corresponding to the acquisition signal of the aforementioned current transformer.

[0126] The seventh control unit is used to control the wireless host to distribute the above-mentioned simulation signal to the corresponding analog terminal and the above-mentioned digital terminal under the same clock through the IEEE1588 time synchronization function.

[0127] In the above implementation, as shown in the schematic diagram of the debugging system, the debugging simulation platform sends the simulated data to the wireless host. The wireless host and the debugging simulation software directly connect via a network cable to achieve data transmission. Due to the necessity of debugging, when the physical distance between the devices being debugged is too large, or when multiple sets of protection devices are being debugged together, using physical wiring to achieve signal transmission between the host and each terminal would make the debugging process more cumbersome and the wiring method very complex. Therefore, during the debugging process, the wireless host and each terminal use wireless transmission to achieve signal transmission, and it is necessary to ensure that the clocks of each device are consistent. The wireless host, as a relay station between the terminal and the simulation platform, can realize signal relay and control, and can connect to multiple terminals simultaneously. The wireless host receives the simulation results sent by the debugging system simulation platform via a network cable, and synchronizes the clocks of each terminal with the wireless host through the IEEE 1588 time synchronization function, so that the final transmitted simulation results are under the same clock, thereby realizing the synchronous execution of multiple debugging tasks. The terminals mentioned above are analog terminals / digital terminals, whose function is to simulate the voltage and current transformers of a digital substation. Currently, some digital substations are newly built, while a large portion are upgraded from traditional substations, still using electromagnetic instrument transformers. Therefore, depending on the data interface requirements, when the tested bay uses electronic instrument transformers to collect voltage and current signals, a digital terminal will be used to simulate the transformers during commissioning to output data in FT3 frame format. When the tested bay uses traditional electromagnetic instrument transformers to collect voltage and current signals, an analog terminal will be used to simulate the transformers during commissioning to output data. Both the wireless host and the terminal have a fixed IP address. Using a Client / Server model, one host can connect to multiple terminals, allowing simultaneous commissioning of multiple bays and multiple protection devices. Through the wireless host, the commissioning system simulation platform can control multiple terminals.

[0128] The aforementioned commissioning device for the digital substation includes a processor and a memory. The first control unit, second control unit, third control unit, fourth control unit, and fifth control unit are all stored as program units in the memory. The processor executes these program units stored in the memory to achieve the corresponding functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0129] The processor contains at least one core, which retrieves the corresponding program unit from memory. Adjusting the core parameters addresses the problem of incomplete commissioning of secondary systems in substations in existing technologies. The memory may include non-permanent memory in computer-readable media, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. The memory includes at least one storage chip.

[0130] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the commissioning method of the digital substation.

[0131] Step S201: Control the debugging software to generate a simulation signal corresponding to the acquisition signal of the aforementioned instrument transformer, and send the simulation signal to the aforementioned merging unit; Step S202: Control the aforementioned merging unit to process the simulation signal to obtain a first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the aforementioned measurement and control device; Step S203: Control the aforementioned protection device or the aforementioned measurement and control device to generate a corresponding action command based on the aforementioned first digital simulation signal, and send the action command to the aforementioned smart terminal; Step S204: Control the aforementioned smart electronic device to receive and execute the action command transmitted by the aforementioned smart terminal, and send the action status of the aforementioned smart electronic device to the aforementioned smart terminal; Step S205: If the action status of all the aforementioned smart electronic devices meets expectations, determine that the digital substation has passed the commissioning.

[0132] This invention provides a processor for running a program, wherein the program executes the debugging method for the digital substation.

[0133] Specifically, the commissioning methods for digital substations include:

[0134] Step S201: Control the debugging software to generate a simulation signal corresponding to the acquisition signal of the aforementioned instrument transformer, and send the simulation signal to the aforementioned merging unit; Step S202: Control the aforementioned merging unit to process the simulation signal to obtain a first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the aforementioned measurement and control device; Step S203: Control the aforementioned protection device or the aforementioned measurement and control device to generate a corresponding action command based on the aforementioned first digital simulation signal, and send the action command to the aforementioned smart terminal; Step S204: Control the aforementioned smart electronic device to receive and execute the action command transmitted by the aforementioned smart terminal, and send the action status of the aforementioned smart electronic device to the aforementioned smart terminal; Step S205: If the action status of all the aforementioned smart electronic devices meets expectations, determine that the digital substation has passed the commissioning.

[0135] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0136] Step S201: Control the debugging software to generate a simulation signal corresponding to the acquisition signal of the aforementioned instrument transformer, and send the simulation signal to the aforementioned merging unit; Step S202: Control the aforementioned merging unit to process the simulation signal to obtain a first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the aforementioned measurement and control device; Step S203: Control the aforementioned protection device or the aforementioned measurement and control device to generate a corresponding action command based on the aforementioned first digital simulation signal, and send the action command to the aforementioned smart terminal; Step S204: Control the aforementioned smart electronic device to receive and execute the action command transmitted by the aforementioned smart terminal, and send the action status of the aforementioned smart electronic device to the aforementioned smart terminal; Step S205: If the action status of all the aforementioned smart electronic devices meets expectations, determine that the digital substation has passed the commissioning.

[0137] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0138] Step S201: Control the debugging software to generate a simulation signal corresponding to the acquisition signal of the aforementioned instrument transformer, and send the simulation signal to the aforementioned merging unit; Step S202: Control the aforementioned merging unit to process the simulation signal to obtain a first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the aforementioned measurement and control device; Step S203: Control the aforementioned protection device or the aforementioned measurement and control device to generate a corresponding action command based on the aforementioned first digital simulation signal, and send the action command to the aforementioned smart terminal; Step S204: Control the aforementioned smart electronic device to receive and execute the action command transmitted by the aforementioned smart terminal, and send the action status of the aforementioned smart electronic device to the aforementioned smart terminal; Step S205: If the action status of all the aforementioned smart electronic devices meets expectations, determine that the digital substation has passed the commissioning.

[0139] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A commissioning method for a digital substation, characterized in that, A digital substation includes instrument transformers, merging units, intelligent terminals, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and monitoring and control devices. The merging unit is used to synchronously merge the signals collected by the instrument transformers. The intelligent terminal is used to enable communication between the primary equipment and the secondary equipment. The method includes: The control and debugging software generates a simulation signal corresponding to the acquisition signal of the current transformer, and sends the simulation signal to the merging unit; The merging unit processes the simulation signal to obtain a first digital simulation signal, and sends the first digital simulation signal to the corresponding protection device or the measurement and control device. The control device or the measurement and control device generates a corresponding action command based on the first digital simulation signal and sends the action command to the smart terminal; The system controls the intelligent electronic device to receive and execute the action instructions transmitted by the intelligent terminal, and sends the action status of the intelligent electronic device to the intelligent terminal. If the operating status of all the intelligent electronic devices meets expectations, the digital substation is deemed to have passed commissioning.

2. The method according to claim 1, characterized in that, When debugging the main transformer differential protection, the control debugging software generates a simulation signal corresponding to the acquired signal of the instrument transformer and sends the simulation signal to the merging unit, including: The debugging software is controlled to generate high-voltage side current simulation signals, medium-voltage side current simulation signals and low-voltage side current simulation signals of the main transformer, and the high-voltage side current simulation signals, the medium-voltage side current simulation signals and the low-voltage side current simulation signals are sent to the corresponding merging units; The first digital simulation signal obtained by controlling the merging unit to process the simulation signal, and sending the first digital simulation signal to the corresponding protection device or the measurement and control device, includes: Each of the merging units is controlled to process the high-voltage side current simulation signal, the medium-voltage side current simulation signal, and the low-voltage side current simulation signal to obtain three first digital simulation signals, and the three first digital simulation signals are sent to the corresponding protection devices respectively; Controlling the protection device or the measurement and control device to generate a corresponding action command based on the first digital simulation signal, and sending the action command to the smart terminal, includes: When the current corresponding to the target digital simulation signal is greater than the predetermined current, the protection device corresponding to the target digital simulation signal generates a circuit breaker command and sends the circuit breaker command to the smart terminal. The target digital simulation signal is any one of the first digital simulation signals. Controlling the intelligent electronic device to receive and execute the action command transmitted by the intelligent terminal, and sending the action status and location information of the intelligent electronic device to the intelligent terminal, includes: The circuit breaker controlling the main transformer receives and executes the circuit breaker command transmitted by the smart terminal, and sends the circuit breaker's circuit breaker status and location information to the smart terminal.

3. The method according to claim 1, characterized in that, The current transformer includes an electronic current transformer. Control and debugging software generates a simulation signal corresponding to the acquired signal of the current transformer and sends the simulation signal to the merging unit, including: The control and debugging software generates a second digital simulation signal corresponding to the digital signal of the electronic instrument transformer, and transmits the second digital simulation signal to the digital terminal via a wireless network; The digital terminal is controlled to send the second digital simulation signal to the corresponding merging unit via a wired network.

4. The method according to claim 1, characterized in that, The current transformer includes an electromagnetic current transformer. Control and debugging software generates a simulation signal corresponding to the acquired signal of the current transformer and sends the simulation signal to the merging unit, including: The control and debugging software generates a third digital simulation signal corresponding to the analog signal of the electromagnetic transformer, and transmits the third digital simulation signal to the analog terminal via a wireless network; The analog terminal is controlled to send the third digital simulation signal to the power amplifier to convert it into an analog signal. The power amplifier is controlled to send the simulated signal to the corresponding merging unit via a cable.

5. The method according to claim 1, characterized in that, The first digital simulation signal obtained by controlling the merging unit to process the simulation signal includes: The merging unit is controlled to process digital simulation signals and / or analog simulation signals to obtain the first digital simulation signal in IEC61850-9-2 frame format.

6. The method according to claim 1, characterized in that, The control and debugging software generates simulation signals corresponding to the acquired signals of the current transformer, including: The debugging software is controlled to generate a simulation circuit for the digital substation. The simulation circuit is subjected to steady-state and transient simulations to generate the simulation signal corresponding to the acquisition signal of the current transformer.

7. The method according to any one of claims 1 to 6, characterized in that, The debugging system includes a simulation platform and a wireless host. The debugging software runs on the simulation platform. The wireless host is wirelessly connected to multiple analog and digital terminals. After the debugging software generates the simulation signal corresponding to the acquired signal of the current transformer, the method further includes: The wireless host is controlled to receive the simulation signal corresponding to the acquisition signal of the current transformer generated by the simulation platform through a wired network; The wireless host is controlled to distribute the simulated signal to the corresponding analog terminal and the digital terminal under the same clock through the IEEE 1588 time synchronization function.

8. A commissioning device for a digital substation, characterized in that, A digital substation includes instrument transformers, merging units, intelligent terminals, primary equipment, and secondary equipment. The primary equipment includes intelligent electronic devices, and the secondary equipment includes protection devices and monitoring and control devices. The merging unit is used to synchronously merge the signals collected by the instrument transformers. The intelligent terminal is used to enable communication between the primary equipment and the secondary equipment. The device includes: The first control unit is used to control the debugging software to generate a simulation signal corresponding to the acquisition signal of the current transformer, and send the simulation signal to the merging unit; The second control unit is used to control the merging unit to process the simulation signal to obtain the first digital simulation signal, and send the first digital simulation signal to the corresponding protection device or the measurement and control device. The third control unit is used to control the protection device or the measurement and control device to generate corresponding action commands based on the first digital simulation signal, and send the action commands to the smart terminal; The fourth control unit is used to control the intelligent electronic device to receive and execute the action instructions transmitted by the intelligent terminal, and to send the action status of the intelligent electronic device to the intelligent terminal; The fifth control unit is used to determine that the digital substation has passed commissioning if the operating states of all the intelligent electronic devices meet expectations.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1 to 7.

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