Fault test platform and fault test method for network construction type converter valve

Abstract

The invention relates to a fault test platform and a fault test method for a network construction type converter valve, and the platform stores a plurality of fault test types of the network construction type converter valve through a fault test system, and can efficiently, conveniently and accurately simulate a plurality of faults of a valve control system and a valve module. Simulation software is prevented from being adopted to simulate fault testing of the network-building type converter valve, so that the problem that off-line simulation cannot accurately simulate real-time operation characteristics of the network-building type converter valve is solved, the central control board system carries out jitter elimination processing by utilizing a multi-level fault jitter elimination algorithm on the basis of the fault testing data to obtain the fault testing data after jitter elimination, and the fault testing efficiency is improved. And based on the fault test data after jitter elimination, generating setting information corresponding to the fault test data, so that the fault verification means of the super-capacitance type networking control protection device can be increased, and the simulation precision of the real-time operation characteristics of the super-capacitor in an actual networking system is improved. And complete verification of the overall control performance and function of the power system is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a fault testing platform and a fault testing method for a grid-type converter valve. Background Art

[0002] With the increasing penetration of renewable energy sources such as wind power and photovoltaics in power systems, power electronics equipment has become widely used. Consequently, power systems are transitioning from traditional systems dominated by synchronous generators to "double-high" power systems with a high proportion of both renewable energy and power electronics. This "double-high" power system has a low proportion of synchronous generators, resulting in low inertia and underdamping, making the voltage and frequency stability of the power system increasingly problematic. The converters in traditional power systems use grid-following control, which is unable to provide inertia and damping for the power system.

[0003] Therefore, the trend is to transform traditional grid-following control into grid-forming control. Grid-forming converters can simulate synchronous generators to provide inertia and damping for the power system, participate in regulating grid voltage and frequency, and achieve independent support for grid voltage.

[0004] However, for a single power grid in harsh environments such as high altitude and severe cold, the provision of instantaneous current when a power system failure occurs still faces severe challenges, and the stability of the power grid still needs to be strengthened. Therefore, the grid-side network control and protection device with supercapacitors will become an important technical means to solve this problem.

[0005] Grid-side supercapacitors provide stable voltage support and fast current output for the entire power system. Supercapacitors are characterized by high overload, rapid response, and strong active power support. Furthermore, the system, which is located on the DC side of the grid control and protection device, contains numerous power electronic devices and a complex structure. Currently, verification of its control strategies and protection algorithms primarily relies on software simulation, which cannot accurately simulate the real-time operating characteristics of actual supercapacitor grid control and protection devices, hindering the complete verification of the power system's overall control performance and functionality. Summary of the Invention

[0006] In order to solve the existing problems of the prior art, the present invention provides a fault testing platform for a network-type converter valve, the fault testing platform comprising: a central control board system, a fault testing system and a valve control system, the central control board system being communicatively connected to the valve control system and the fault testing system respectively;

[0007] The fault testing system is used to store multiple fault test types of the networked converter valve and generate and send fault test data based on each fault test type;

[0008] The central control board system is configured to receive the fault test data, perform debounce processing on the fault test data using a multi-level fault debounce algorithm to obtain debounced fault test data, and generate setting information corresponding to the fault test data based on the debounced fault test data;

[0009] The valve control system is used to receive and display the setting information corresponding to the fault test data.

[0010] Optionally, the fault test data includes a plurality of differential signals;

[0011] The central control board system is specifically used to receive multiple differential signals, and based on the multiple differential signals, use a multi-level fault debouncing algorithm to perform debouncing processing to obtain multiple differential signals after debouncing; based on the multiple differential signals after debouncing, use a preset error formula to perform calculations to obtain error values; when the error value is less than a preset reference value, generate set information corresponding to the fault test data.

[0012] Optionally, the preset error formula satisfies the following formula:

[0013]

[0014] Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i are the differential signals after debounce, K p is the error gain coefficient.

[0015] Optionally, the fault testing platform further comprises: a protection system and a real-time digital simulation system, wherein the protection system is communicatively connected to the valve control system, and the central control board system is connected to the real-time digital simulation system via different communication interfaces;

[0016] The real-time digital simulation system is used to run the electrical simulation model of the networked converter valve, generate the fault simulation data and the expected received data corresponding to the fault simulation data, and send the fault simulation data and the expected received data to the central control board system;

[0017] The central control board system is configured to receive the fault simulation data and the expected reception data, and forward the fault simulation data to the valve control system; and is further configured to generate setting information corresponding to the fault simulation data based on the expected reception data and the protection exit data generated by the protection system;

[0018] The valve control system is used to calibrate the fault simulation data, obtain the calibrated fault simulation data, and send the calibrated fault simulation data to the protection system; and is also used to receive and display the setting information corresponding to the fault simulation data;

[0019] The protection system is used to process the calibrated fault simulation data using a protection formula and a protection exit formula to generate protection exit data corresponding to the fault simulation data.

[0020] Optionally, the protection system includes a plurality of protection chassis and a plurality of three-out-of-two chassis, and each protection chassis is communicatively connected to a corresponding three-out-of-two chassis;

[0021] Each of the protection chassis is configured to process the calibrated fault simulation data using a protection formula to obtain a plurality of action export data, and send the plurality of action export data to a two-out-of-three chassis corresponding to the protection chassis;

[0022] Each of the three-out-of-two chassis is used to process the multiple action export data using a protection export formula to obtain protection export data corresponding to the fault simulation data, and send the protection export data to the central control board system through the valve control chassis.

[0023] Optionally, the central control board system is specifically used to: based on the protection exit data generated by the protection system, compare the protection exit data with the expected received data; if the protection exit data is consistent with the expected received data, generate setting information corresponding to the fault simulation data.

[0024] Optionally, the valve control system includes a valve control chassis, a communication management chassis and a valve control host computer, and the valve control chassis is communicatively connected to the valve control host computer via the communication management chassis;

[0025] The valve control chassis is configured to forward the setting information corresponding to the fault test data to the valve control host computer via the communication management chassis upon receiving the setting information corresponding to the fault test data;

[0026] The valve control host computer is used to display the setting information corresponding to the fault test data.

[0027] Optionally, the central control board system is further configured to obtain a fault simulation command signal and communication test data, and when the fault simulation command signal is at a high level, delay a preset time length from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time length, generate and send a set message indicating that the simulation is successful;

[0028] The valve control system is further configured to receive and display the setting information indicating successful simulation of the flag.

[0029] Optionally, the valve control system is also used to obtain a fault simulation command signal and communication test data. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

[0030] Based on the same inventive concept, the present invention further provides a fault testing method for a network-type converter valve, which is applied to the above-mentioned fault testing platform. The fault testing method includes:

[0031] Based on the fault test system in the fault test platform, multiple fault test types of the networked converter valve are stored, and fault test data is generated based on each fault test type;

[0032] Based on the fault test data, the central control board system in the fault test platform uses a multi-level fault debounce algorithm to perform debounce processing to obtain the debounced fault test data, and based on the debounced fault test data, generates setting information corresponding to the fault test data;

[0033] The valve control system in the fault test platform displays setting information corresponding to the fault test data.

[0034] Optionally, the fault test data includes a plurality of differential signals;

[0035] The generating, based on the debounced fault test data, setting information corresponding to the fault test data includes:

[0036] Based on the multiple differential signals after debounce, a preset error formula is used to calculate and obtain an error value;

[0037] When the error value is smaller than a preset reference value, setting information corresponding to the fault test data is generated.

[0038] Optionally, the preset error formula satisfies the following formula:

[0039]

[0040] Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i They are the differential signals after debounce, K p is the error gain coefficient.

[0041] Optionally, the fault testing method further includes:

[0042] Based on the real-time digital simulation system in the fault testing platform, running the electrical simulation model of the networked converter valve to generate the fault simulation data and the expected received data corresponding to the fault simulation data;

[0043] Based on the valve control system, calibrating the fault simulation data to obtain calibrated fault simulation data;

[0044] Based on the protection system in the fault test platform, according to the calibrated fault simulation data, the protection formula and the protection exit formula are used to process and generate protection exit data corresponding to the fault simulation data;

[0045] Based on the central control board system, generating setting information corresponding to the fault simulation data according to the expected received data and the protection exit data generated by the protection system;

[0046] Based on the valve control system, setting information corresponding to the fault simulation data is displayed.

[0047] Optionally, processing the calibrated fault simulation data using a protection formula and a protection exit formula to generate protection exit data corresponding to the fault simulation data includes:

[0048] According to the calibrated fault simulation data, the protection formula is used to process it and obtain multiple action output data;

[0049] The protection exit formula is used to process the plurality of action exit data to obtain protection exit data corresponding to the fault simulation data.

[0050] Optionally, the generating, according to the expected received data and the protection exit data generated by the protection system, setting information corresponding to the fault simulation data includes:

[0051] According to the protection exit data generated by the protection system, the protection exit data is compared with the expected received data. If the protection exit data is consistent with the expected received data, setting information corresponding to the fault simulation data is generated.

[0052] Optionally, the fault testing method further includes:

[0053] Based on the central control board system, a fault simulation command signal and communication test data are obtained, and when the fault simulation command signal is at a high level, a preset time length is delayed from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time length, a set information indicating that the simulation is successful is generated;

[0054] Based on the valve control system, setting information indicating successful simulation of the flag is displayed.

[0055] Optionally, the fault testing method further includes:

[0056] Based on the valve control system, a fault simulation command signal and communication test data are obtained. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] The present invention provides a fault testing platform and method for a meshed-type converter valve. The fault testing platform for the meshed-type converter valve stores multiple fault test types of the meshed-type converter valve through a fault testing system, and can efficiently, conveniently and accurately simulate various faults occurring in the valve control system and valve module, avoiding the use of simulation software to simulate the fault test of the meshed-type converter valve, thereby eliminating the problem that offline simulation cannot accurately simulate the real-time operating characteristics of the meshed-type converter valve, and generating fault test data according to the fault test type. The central control board system uses a multi-level fault debouncing algorithm to debouncing the fault test data based on the fault test data to obtain the debouncing fault test data. Based on the debouncing fault test data, the central control board system generates setting information corresponding to the fault test data, which can increase the fault verification means of the supercapacitor meshed control and protection device, improve the simulation accuracy of the real-time operating characteristics of the supercapacitor in the actual meshed system, and is conducive to complete verification of the overall control performance and function of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A block diagram of a fault testing platform for a networked converter valve provided by the present invention;

[0060] Figure 2 A schematic diagram of an operation interface of a fault simulation host computer provided by the present invention;

[0061] Figure 3 A block diagram of a fault testing platform for a networked converter valve provided by the present invention;

[0062] Figure 4 This is a diagram of the electrical simulation model of an ultra-capacitive grid-connected converter valve provided by the present invention;

[0063] Figure 5 A schematic diagram of a fault simulation in which a RTDS system sends fault information provided by the present invention;

[0064] Figure 6A block diagram of a communication fault information flow provided by the present invention;

[0065] Figure 7 A process diagram of a communication fault provided by the present invention;

[0066] Figure 8 A schematic structural diagram of a fault testing platform for a network-type converter valve provided by the present invention. DETAILED DESCRIPTION

[0067] Example 1:

[0068] Figure 1 The block diagram of a fault testing platform for a networked converter valve provided by the present invention is as follows: Figure 1 As shown, the fault test platform includes: a central control board system, a fault test system and a valve control system, and the central control board system is communicatively connected to the valve control system and the fault test system respectively; the fault test system is used to store multiple fault test types of the network-type flow control valve, and generate and send fault test data based on each fault test type; the central control board system is used to receive the fault test data, and based on the fault test data, use a multi-level fault debouncing algorithm to perform debouncing processing to obtain the debouncing fault test data, and generate setting information corresponding to the fault test data based on the debouncing fault test data; the valve control system is used to receive and display the setting information corresponding to the fault test data.

[0069] Among them, the fault test system may include: a fault test host computer, a network switch and a valve control fault simulation chassis. The fault test host computer can also be called a fault simulation host computer. The central control board system may include: an AURORA adapter box including an MMC (Modular Multilevel Converter) and an overcapacity AURORA adapter box. The valve control system can also be called a valve control system of an overcapacity type network control and protection device, which includes three parts: a valve control chassis, a communication management chassis and a valve control host computer. The setting information may include setting and clearing. Setting means setting the current state to 1, and clearing means setting the current state to 0. In some scenarios, the network-type converter valve can also be called an overcapacity type network control and protection device, and the fault test platform can also be called a fault simulation test platform.

[0070] It should be noted that the fault simulation host computer can be used to display Figure 2The host computer fault simulation interface of the supercapacitor network control and protection device shown includes an SM (submodule) fault selection interface and a supercapacitor module (CCU) fault selection interface (i.e., the MMC submodule fault type selection interface and the supercapacitor submodule fault type selection interface). It also includes an SM fault module selection and setup interface, a supercapacitor fault module selection and setup interface, and a network setup interface. The SM fault selection interface primarily includes the SM fault type, SM fault number, and SM network configuration. For example, the SM fault selection interface (i.e., the MMC submodule fault type selection interface) can include SM main body fault types, SM overvoltage protection types, overcurrent protection types, SM communication fault types, SM power supply types, and bypass types. The supercapacitor CCU fault selection interface primarily includes CCU unit main body fault types and supercapacitor CCU protection fault types. For example, the fault selection interface of the super-capacity CCU (i.e., the super-capacity submodule fault type selection interface) may include: CCU single fault, CCU circuit breaker fault, CCU fuse fault, and SM body fault type, SM overvoltage protection type, overcurrent protection type, SM communication fault type, SM power supply type, and bypass type, etc.

[0071] The fault testing platform of the present invention has strong advantages in terms of fault test types, test fault combinations, test functions, etc. It can test 80 types of faults, including sub-module faults and over-capacity CCU faults, and can also create protection faults. The fault test is relatively comprehensive.

[0072] The fault test host computer sends multiple fault test types to the super-capacity AURORA transfer box or the MMC's AURORA transfer box through the network switch and the communication management chassis. The super-capacity AURORA transfer box or the MMC's AURORA transfer box generates setting information corresponding to the fault test data based on the fault test data, and sends it to the valve control system, and the setting information is displayed on the valve control host computer.

[0073] The information flow of the RTDS (Real-Time Digital Simulator)-based super-capacitor grid-type converter valve fault simulation test platform (i.e., the grid-type converter valve fault test platform) will interact between the above-mentioned chassis. The fault simulation interface chassis (i.e., the valve control chassis) is equipped with a host computer operation interface, which covers all submodule faults in both branches, submodule shunt capacitor faults, submodule protection faults, and submodule communication faults.

[0074] Signals sent from the fault simulation host computer directly act on the IP core in the AURORA adapter box via switch communication. The IP's basic operating process involves performing tasks such as direct and cross-communication with the valve-controlled chassis and adjacent IPs. This allows for the reception and decoding of downlink commands, encoding and transmission of uplink data, simulating the operating logic of submodule components such as the power supply, overvoltage and undervoltage protection circuits, and bypass switches, outputting the submodule's physical status, and implementing fault simulation based on fault simulation commands.

[0075] Optionally, the fault test data includes multiple differential signals; the central control board system is specifically used to receive multiple differential signals, and based on the multiple differential signals, use a multi-level fault debouncing algorithm to perform debouncing processing to obtain multiple differential signals after debouncing; based on the multiple differential signals after debouncing, use a preset error formula to perform calculation to obtain an error value; when the error value is less than a preset reference value, generate the setting information corresponding to the fault test data.

[0076] It should be noted that the preset error formula satisfies the following formula:

[0077]

[0078] Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i They are the differential signals after debounce, K p is the error gain coefficient.

[0079] For example, start the fault simulation host computer, which is connected to the valve control fault simulation chassis through a network switch. According to the factory test requirements, set the corresponding fault type in the fault simulation host computer software, set the faults one by one or in combination, and reliably and accurately simulate various faults that may occur in the actual operation of the valve control system and valve module, thereby verifying the control strategy of the valve control system and the fault response capability of the valve module. Simulate the failure of the submodule by setting the fault on the fault simulation host computer. Take the abnormal power supply of branch 1 module 5 as an example. The specific operation is as follows:

[0080] Start the fault simulation host computer operation interface, click "SM submodule selection setting interface", and select the serial number of the fault module;

[0081] Click "SM Submodule Fault Type Selection Interface", select "Power Supply Abnormality" in "SM Power Type", and generate Pow i _Err_Tx0 and Pow i _Err_Tx1 two differential signals and one Pow i_Err_Tx, determine whether to send the above fault signal in the "Network Settings" interface. i _Err_Tx0, Pow i _Err_Tx1 and Pow i _Err_Tx is transmitted to the MMC AURORA adapter box or the over-capacity AURORA adapter box through Ethernet. After receiving the fault signal, the IP core of the AURORA adapter box performs multi-level fault debounce processing, namely Pow i _Err_Rx0, Pow i _Err_Rx1 and Pow i _Err_Rx.

[0082]

[0083] Among them, fon() function is used to calculate the transmission error value of the fault signal, Kp is the error gain coefficient, ERR i Also represents the signal transmission error value, x i ,y i , z i Pow i _Err_Rx0, Pow i _Err_Rx1、Pow i _Err_Rx.

[0084] When the calculated value ERR i <Engineering reference value ERR ref (ie preset reference value), the reference value here can be 0.1, it is considered that the fault simulation parameters are set successfully, and Pow is set. i _Err_Flag.

[0085] Pow i _Err_Flag is sent to the MMC valve control chassis or super-capacity valve control chassis through high-speed optical fiber, and the fault information of the submodule is finally displayed on the valve control host computer. i _Err_Flag equal to 1 indicates that the fault is set successfully.

[0086] Figure 3 The block diagram of a fault testing platform for a networked converter valve provided by the present invention is as follows: Figure 3As shown, the fault test platform also includes: a protection system and a real-time digital simulation system, the protection system is communicatively connected to the valve control system, and the central control board system is connected to the real-time digital simulation system through different communication interfaces; the real-time digital simulation system is used to run the electrical simulation model of the networked converter valve, generate the fault simulation data and the expected received data corresponding to the fault simulation data, and send the fault simulation data and the expected received data to the central control board system; the central control board system is used to receive the fault simulation data and the expected received data, and forward the fault simulation data to the valve control system; and is also used to generate setting information corresponding to the fault simulation data based on the expected received data and the protection outlet data generated by the protection system; the valve control system is used to calibrate the fault simulation data to obtain the calibrated fault simulation data, and send the calibrated fault simulation data to the protection system; and is also used to receive and display the setting information corresponding to the fault simulation data; the protection system is used to process the calibrated fault simulation data using the protection formula and the protection outlet formula to generate the protection outlet data corresponding to the fault simulation data.

[0087] The RTDS system uses the NovaCor hardware simulation platform. Depending on the scale of the simulation model, a NovaCor unit and several GTFPGA units are configured. The NovaCor unit runs the simulation model, while the GTFPGA unit simulates the status of the valve modules. The protection system, also known as the protection system for the super-capacity network control and protection device, includes the AURORA protection adapter box, the MMC protection chassis, the super-capacity protection chassis, the MMC three-out-of-two chassis, and the super-capacity three-out-of-two chassis. The AURORA protection adapter box forwards and processes information such as submodule voltage and submodule bypass status sent by the GTFPGA. The MMC protection chassis responds to protection actions based on information from the AURORA protection chassis, while the three-out-of-two chassis responds to output actions based on information from the three protection sets. The super-capacity protection is handled in the same manner. The fault simulation platform of the super-capacity network control and protection device exchanges data using the Ethernet protocol of the super-capacity AURORA adapter box, which is relatively simple and convenient for screen configuration.

[0088] It should be noted that the fault testing platform provided by the present invention can not only test the faults of the super-capacitive grid-forming converter valve through the fault test data generated by the fault testing system, but also test the faults of the super-capacitive grid-forming converter valve through the fault simulation data generated by the real-time digital simulation system based on the electrical simulation model of the grid-forming converter valve. The electrical simulation model of the super-capacitive grid-forming converter valve adopts a modular multi-level converter (MMC) plus supercapacitor topology. The modular multi-level converter includes three phases and six bridge arms, and the two branches of the supercapacitor are connected in parallel on the DC side of the modular multi-level converter. The super-capacitive power topology (i.e., the modular multi-level converter plus supercapacitor topology) is a new topology in the field of grid-forming of power systems.

[0089] For example, Figure 4 As shown in the figure, an electrical simulation model of a supercapacitor grid-connected converter valve is established in RSCAD software, including a power supply, an MMC full-bridge converter, and a supercapacitor parallel branch. The MMC full-bridge converter includes a submodule phase unit, and a submodule (SM) phase unit includes six bridge arms. Each bridge arm includes several submodule units, and each submodule unit adopts a full-bridge structure. Each supercapacitor subunit (or supercapacitor unit) in the supercapacitor branch (i.e., supercapacitor parallel branch) includes a submodule body and a parallel supercapacitor CCU. The electrical simulation model of the supercapacitor grid-connected converter valve includes the following features:

[0090] 1) The left half of the simulation model of the super-capacitive grid-connected converter valve adopts a modular multilevel converter topology. The number of submodules (SMs) in each bridge arm is flexibly configured according to the voltage level requirements. The upper and lower bridge arms constitute the SM phase unit. The number of bridge arm submodules must be coordinated with the number of GTPGA units in the RTDS system.

[0091] 2) The simulation model connects two supercapacitor branches in parallel on the DC side. Each supercapacitor unit consists of a submodule and a supercapacitor, connected to the module and capacitor via a circuit breaker and fuse. When the supercapacitor three-out-of-two chassis determines that the current arm current and module voltage have exceeded the limit or returned to below the set value, the supercapacitor can trip or reset according to the operating conditions.

[0092] The fault testing platform also includes: a computer system, which is used to establish and compile the electrical simulation model of the super-capacity network control and protection device, that is, the computer (or computer system) establishes and compiles the electrical simulation model of the super-capacity network converter valve through RSCARD software; the RTDS system is used to run the compiled electrical simulation model of the super-capacity network control and protection device, that is, to simulate the real converter valve; the central control board system is used to forward and process RTDS data, and at the same time send fault status information to the valve module to simulate the fault of the real sub-module. The IP core of the chassis core board is embedded with all the fault interfaces of the sub-modules, which is used to set and clear various fault information of the sub-modules, thereby simulating various types of faults that may occur in the valve module during actual operation. The sub-module information in the RTDS simulation model will be transmitted to the IP core in the fault simulation interface chassis for use. The valve control chassis of the valve control system of the super-capacity network control and protection device, the core board of the valve control device adopts the FPGA (Field Programmable Gate Array) + ARM (Advanced RISCMachine) processing architecture, including the MMC valve control chassis and the super-capacity valve control chassis. Each chassis contains two core boards and several interface boards. The core board is used to process the core algorithm and interact with the RTDS model. The interface board is used to exchange information with the IP core in the interface chassis and pass it to the core board.

[0093] The valve control system of the super-capacity network control and protection device is the control system of the converter valve, which is used to realize the operation control of the valve module in the electrical simulation model of the super-capacity network control and protection device; the protection system is used to realize the action protection of the converter valve; the central control board system is the software control system that manages the sub-modules in the converter valve, and each sub-module has a corresponding central control board.

[0094] The present invention provides a test platform for a super-capacitive grid-connected converter valve based on RTDS. The super-capacitive grid-connected converter valve is tested using the aforementioned fault simulation test platform for the super-capacitive grid-connected converter valve based on RTDS. The method comprises: setting an operating mode of a super-capacitive grid-connected control and protection device and configuring corresponding power supplies and loads in RTDS software; the RTDS system sends electrical quantities and switch quantities to a fault simulation interface chassis according to an electrical simulation model of the super-capacitive grid-connected control and protection device; the fault simulation interface chassis can receive fault information from the RTDS, SM communication fault information, SM main body fault information, protection fault information, and fault information sent by a fault simulation host computer; its peripheral modules and IP core send control instructions based on the received electrical quantities and switch quantities to generate corresponding fault signals; and the operating status of the super-capacitive grid-connected control and protection device system can be viewed through a monitoring interface in the valve control chassis host computer and the RTDS simulation model.

[0095] Optionally, the protection system includes multiple protection chassis and multiple three-out-of-two chassis, and each protection chassis is communicatively connected to the corresponding three-out-of-two chassis; each of the protection chassis is used to process the calibrated fault simulation data using a protection formula to obtain multiple action export data, and send the multiple action export data to the three-out-of-two chassis corresponding to the protection chassis; each of the three-out-of-two chassis is used to process the multiple action export data using a protection export formula to obtain protection export data corresponding to the fault simulation data, and send the protection export data to the central control board system through the valve control chassis.

[0096] Optionally, the central control board system is specifically used to: based on the protection exit data generated by the protection system, compare the protection exit data with the expected received data; if the protection exit data is consistent with the expected received data, generate setting information corresponding to the fault simulation data.

[0097] For example, the fault comes from the RTDS model. The IP core inside the AURORA adapter box is used to determine whether the fault has occurred. The fault handling process is as follows: Figure 5 As shown, taking the hardware overcurrent as an example, the specific steps are as follows:

[0098] When the RTDS system is operating normally, the current of the converter valve overcapacity branch submodule is C through the RSCAD simulation model. si , simulate the fault current, and at the same time the RTDS system gives the expected receiving reference value (i.e. expected receiving data) Z of the fault simulation ref_C_si ; Submodule current C si and the expected receiving reference value Z ref_C_si The current value of the submodule is sent to the supercapacitor's AURORA transfer box through the GTFPGA. The IP core is the physical model of the simulated submodule. The current value of the submodule is sent to the supercapacitor valve-controlled chassis (i.e., the valve-controlled chassis); after receiving the fault current, the valve-controlled chassis performs calibration processing to obtain C si_0 The current value will be sent to the over-capacity protection chassis; there are three over-capacity protection chassis, and the current reference value in any protection chassis is C ref , the three protection chassis core boards make corresponding actions according to the protection formula export Fc1 i , Fc2 i , Fc3 i ; Take two out of three chassis to receive the action outlets of three protection chassis, and get the protection outlet mark Fc according to the protection outlet formula i The valve control chassis sends the signal to the central control board system; the central control board system receives the fault simulation signal and records it as R_Fc i , compare R_Fc i and the expected receiving reference value Z ref_C_siAre the two consistent? If they are consistent, the return value T_Fc is generated. i , true value 1, otherwise 0; the over-capacity valve-controlled chassis receives the above return value T_Fc i After processing, it is sent to the communication management chassis, and the fault simulation results are displayed on the valve control host computer.

[0099] The above process is the method for setting branch fault current through the RTDS system.

[0100] Optionally, the valve control system includes a valve control chassis, a communication management chassis and a valve control host computer, and the valve control chassis is communicatively connected to the valve control host computer through the communication management chassis; the valve control chassis is used to forward the setting information corresponding to the fault test data to the valve control host computer through the communication management chassis when receiving the setting information corresponding to the fault test data; the valve control host computer is used to display the setting information corresponding to the fault test data.

[0101] It should be noted that the valve control host computer of the valve control system of the super-capacity network control and protection device is used to display key information of the entire valve control system and valve protection system and to implement some parameter setting functions.

[0102] The fault simulation platform and method in the present invention are a fault simulation test platform (i.e., a fault test platform) and method applied to a grid-type converter valve (i.e., an overcapacity grid-type converter valve); the test platform for the overcapacity grid-type converter valve is composed of a model computer, an RTDS system, a valve control system, a protection system, and a fault simulation host computer system; the fault simulation test platform, the RTDS system is coordinated by the NovaCor chassis and the GTFPGA; the valve control system adopts the configuration of the MMC aurora transfer box, the overcapacity AURORA transfer box, the MMC valve control chassis, the overcapacity valve control chassis, and the valve control host computer; the protection system adopts the configuration of the aurora transfer box, the MMC protection chassis, the overcapacity protection chassis, the MMC three-out-of-two chassis, and the overcapacity three-out-of-two chassis; the MMC aurora transfer box and the overcapacity AURORA transfer box are provided with independent fault interfaces, and the fault The simulation host computer can transmit fault signals through this interface; the electrical simulation model of the super-capacity grid-type converter valve consists of three phase units of MMC and two independent super-capacity branches; the voltage level and module quantity of each MMC phase unit module in the electrical simulation model of the super-capacity grid-type converter valve are configurable, determined according to the MMC control strategy, the super-capacity unit in the super-capacity branch is composed of the sub-module body and supercapacitor in parallel in a certain way, and the number of super-capacity units in each branch can be dynamically adjusted according to the super-capacity control strategy; the fault simulation host computer interface of the grid-type converter valve fault simulation test platform generally has the simulated fault types of the MMC bridge arm sub-module and the super-capacity branch sub-module; the fault simulation test platform fault types include module body faults, communication faults, protection faults and combination faults; the validity of the fault simulation signal sent by the fault simulation host computer is judged by the formula fon(). Protection-type fault simulation information (i.e., fault simulation data) can be generated through the RTDS simulation model and cooperated with the protection system to generate fault simulation signals; communication-type fault simulation information is tested through variable frames.

[0103] Optionally, the central control board system is further configured to obtain a fault simulation command signal and communication test data, and when the fault simulation command signal is at a high level, delay a preset time length from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time length, generate and send a set message indicating that the simulation is successful;

[0104] The valve control system is further configured to receive and display the setting information indicating successful simulation of the flag.

[0105] Optionally, the valve control system is also used to obtain a fault simulation command signal and communication test data. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

[0106] It should be noted that the fault testing platform provided by the present invention can also be used to test communication faults generated by the platform, that is, a fault simulation command signal and communication test data are sent to the valve control system through the protection system or the central control board system, and the valve control system detects whether a communication fault occurs based on the acquired fault simulation command signal and communication test data, or a fault simulation command signal and communication test data are sent to the central control board system through the fault testing system, RTDS system or protection system, and the central control board system detects whether a communication fault occurs based on the acquired fault simulation command signal and communication test data.

[0107] For example, the fault is generated by the peripheral module of the interface chassis, and the IP core judges the fault. The central control board system sends the data of the valve control chassis, and the simplified process is as follows: Figure 6 As shown in the figure, this flowchart is applicable to communication timeout, communication check error, communication disconnection, etc. Taking the sending valve control communication timeout as an example, the specific steps are as follows:

[0108] Communication-related timing processing Figure 7 As shown in the figure, ① is the fault simulation command parameter, ② is the optical fiber communication before the fault simulation processing, and ③ is the optical fiber communication after the fault processing;

[0109] Signal ① is the fault enable signal, signal ② is sent by the central control board IP core output interface OP_OUT, and signal ③ is sent to the valve control.

[0110] When a frame header is detected, if fault simulation command signal ① is high, a delay of m bits is applied from the time the frame header is detected, ensuring that signal ③ remains high when the frame header should be transmitted. Signal ③ is delayed by n bits compared to signal ② to allow time for the fault simulation logic to detect the frame header. Parameters m, n, and z must be designed based on the specific project; otherwise, the variable frame method may not achieve the desired effect. z can represent multiple frames of data, and CRC represents a cyclic redundancy check.

[0111] After the fault is enabled, if the above process detects the frame header timeout, the timeout flag Time_Out is set to 1, otherwise the flag is 0, indicating that the fault simulation has failed.

[0112] The overall framework of the fault simulation test platform for super-capacitive network control and protection devices:

[0113] like Figure 8As shown, the fault simulation test platform of the super-capacitive network control and protection device based on RTDS in the embodiment of the present invention includes a computer installed with the power system auxiliary design tool RSCAD software, a real-time digital simulator RTDS system, a valve control system of the super-capacitive network control and protection device, a protection system and a fault simulation host computer. RSCAD software is used to establish an electrical simulation model of the super-capacitive network control and protection device. The computer has an Ethernet network port with a correctly installed driver for communication between RSCAD software and the RTDS system; the RTDS system is used to run the compiled electrical simulation model of the super-capacitive network control and protection device, using Ethernet to achieve high-speed communication. The processor is the hardware simulation platform NovaCor, and is also equipped with several high-speed computing units GTFPGA; the protection system is equipped with a protection AURORA adapter box, an MMC protection chassis, a super-capacitive protection chassis, an MMC three-out-of-two chassis and a super-capacitive three-out-of-two chassis in terms of hardware, mainly to realize the simulation and correct operation of the protection function of the valve control device. The valve control device of the super-capacitive network control and protection device is a physical controller used to realize the operation control of the valve control device. The valve control device of the super-capacity network control and protection device is equipped with a core board and several interface boards for processing valve control logic and receiving sub-module information; MMC's AURORA adapter box and super-capacity AURORA adapter box are used to process RTDS module information. At the same time, the fault simulation host computer is connected to the fault simulation chassis (i.e., valve control fault simulation chassis) through the network switch. The host computer can comprehensively, accurately and targetedly create faults in the valve module and valve control system.

[0114] The test platform and method for the RTDS-based networked converter valve in the embodiment of the present invention are carried out in the following steps:

[0115] S1, the computer, RTDS system, valve control device of super-capacity network control and protection device, fault simulation host computer Figure 1 The test platform for the entire networking system was established in this way. RSCAD simulation software communicates with NovaCor simulation hardware equipment via Ethernet protocol. The protection system and valve control system also communicate with NovaCor and GTFPGA respectively via Ethernet protocol. NovaCor and GTFPGA are connected via optical fiber.

[0116] S2. After establishing the test platform, the control mode M and the active power P and reactive power Q are set in the RSCAD simulation model according to the control requirements.

[0117] S3, start the RTDS system, valve control chassis, protection chassis, fault simulation chassis, run the RTDS simulation system, and the RTDS system sends the submodule voltage U to the protection transfer box and valve control transfer box i , current signal I i and switch status S i wait.

[0118] S4, start the valve control device, the valve control device according to the preset control strategy NLM and the received voltage U i , current signal I i and switch status S i Send pulse control instruction MV i , monitor the modulation effect of the control strategy in RSCAD software.

[0119] Among them, steps S1-S4 are the test process common to all fault testing methods.

[0120] In summary:

[0121] The present invention proposes a fault simulation test platform and method for a super-capacitive grid-connected flow control valve based on RTDS, and a fault simulation platform and method for a super-capacitive grid-connected control and protection device, which are new fault testing platforms and methods in the field of grid-connected flow control. The fault simulation test platform includes a computer system, an RTDS system, a valve control system, a protection system, and a central control board system of the super-capacitive grid-connected control and protection device. The super-capacitive grid-connected control and protection device constructed in the test platform can effectively express the electrical characteristics of the super-capacitive grid-connected flow control valve and achieve the expected control effect. The fault simulation test platform constructed based on the RTDS system, the protection system, and the valve control system can efficiently, conveniently, and accurately simulate various faults that may occur in the valve control system and valve module, thereby increasing the fault verification means for the super-capacitive grid-connected control and protection device.

[0122] Example 2:

[0123] Based on the same inventive concept, the present invention further provides a fault testing method for a network-type converter valve, which is applied to the above-mentioned fault testing platform. The fault testing method includes:

[0124] Based on the fault test system in the fault test platform, multiple fault test types of the networked converter valve are stored, and fault test data is generated based on each fault test type;

[0125] Based on the fault test data, the central control board system in the fault test platform uses a multi-level fault debounce algorithm to perform debounce processing to obtain the debounced fault test data, and based on the debounced fault test data, generates setting information corresponding to the fault test data;

[0126] The valve control system in the fault test platform displays setting information corresponding to the fault test data.

[0127] Optionally, the fault test data includes a plurality of differential signals;

[0128] The generating, based on the debounced fault test data, setting information corresponding to the fault test data includes:

[0129] Based on the multiple differential signals after debounce, a preset error formula is used to calculate and obtain an error value;

[0130] When the error value is smaller than a preset reference value, setting information corresponding to the fault test data is generated.

[0131] Optionally, the preset error formula satisfies the following formula:

[0132]

[0133] Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i are the differential signals after debounce, K p is the error gain coefficient.

[0134] Optionally, the fault testing method further includes:

[0135] Based on the real-time digital simulation system in the fault testing platform, running the electrical simulation model of the networked converter valve to generate the fault simulation data and the expected received data corresponding to the fault simulation data;

[0136] Based on the valve control system, calibrating the fault simulation data to obtain calibrated fault simulation data;

[0137] Based on the protection system in the fault test platform, according to the calibrated fault simulation data, the protection formula and the protection exit formula are used to process and generate protection exit data corresponding to the fault simulation data;

[0138] Based on the central control board system, generating setting information corresponding to the fault simulation data according to the expected received data and the protection exit data generated by the protection system;

[0139] Based on the valve control system, setting information corresponding to the fault simulation data is displayed.

[0140] It should be noted that in some scenarios, the fault testing method provided by the present invention can not only generate fault test data through the fault testing system in the fault testing platform to test the network type converter valve, but also generate fault simulation data by implementing a digital simulation system to test the network type converter valve, thereby improving the practicality of the fault testing method.

[0141] Optionally, processing the calibrated fault simulation data using a protection formula and a protection exit formula to generate protection exit data corresponding to the fault simulation data includes:

[0142] According to the calibrated fault simulation data, the protection formula is used to process it and obtain multiple action output data;

[0143] The protection exit formula is used to process the plurality of action exit data to obtain protection exit data corresponding to the fault simulation data.

[0144] Optionally, the generating, according to the expected received data and the protection exit data generated by the protection system, setting information corresponding to the fault simulation data includes:

[0145] According to the protection exit data generated by the protection system, the protection exit data is compared with the expected received data. If the protection exit data is consistent with the expected received data, setting information corresponding to the fault simulation data is generated.

[0146] Optionally, the fault testing method further includes:

[0147] Based on the central control board system, a fault simulation command signal and communication test data are obtained, and when the fault simulation command signal is at a high level, a preset time length is delayed from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time length, a set information indicating that the simulation is successful is generated;

[0148] Based on the valve control system, setting information indicating successful simulation of the flag is displayed.

[0149] Optionally, the fault testing method further includes:

[0150] Based on the valve control system, a fault simulation command signal and communication test data are obtained. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

[0151] It should be noted that the fault testing method provided by the present invention can also detect communication failures of the fault testing platform through the central control board system and the valve control system, thereby avoiding errors in the testing of the networked converter valve caused by communication failures of the fault testing platform.

[0152] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A fault testing platform for a network-type converter valve, characterized in that: The fault testing platform includes: a central control board system, a fault testing system and a valve control system, wherein the central control board system is respectively connected to the valve control system and the fault testing system for communication; The fault testing system is used to store multiple fault test types of the networked converter valve and generate and send fault test data based on each fault test type; The central control board system is configured to receive the fault test data, perform debounce processing on the fault test data using a multi-level fault debounce algorithm to obtain debounced fault test data, and generate setting information corresponding to the fault test data based on the debounced fault test data; The valve control system is used to receive and display the setting information corresponding to the fault test data.

2. The fault testing platform according to claim 1, characterized in that: The fault test data includes a plurality of differential signals; The central control board system is specifically used to receive multiple differential signals, and based on the multiple differential signals, use a multi-level fault debouncing algorithm to perform debouncing processing to obtain multiple differential signals after debouncing; based on the multiple differential signals after debouncing, use a preset error formula to perform calculations to obtain error values; when the error value is less than a preset reference value, generate set information corresponding to the fault test data.

3. The fault testing platform according to claim 2, characterized in that: The preset error formula satisfies the following formula: Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i are the differential signals after debounce, K p is the error gain coefficient.

4. The fault testing platform according to claim 1, characterized in that: The fault testing platform further includes: a protection system and a real-time digital simulation system, wherein the protection system is communicatively connected to the valve control system, and the central control board system is connected to the real-time digital simulation system via different communication interfaces; The real-time digital simulation system is used to run the electrical simulation model of the networked converter valve, generate the fault simulation data and the expected received data corresponding to the fault simulation data, and send the fault simulation data and the expected received data to the central control board system; The central control board system is configured to receive the fault simulation data and the expected reception data, and forward the fault simulation data to the valve control system; and is further configured to generate setting information corresponding to the fault simulation data based on the expected reception data and the protection exit data generated by the protection system; The valve control system is used to calibrate the fault simulation data, obtain the calibrated fault simulation data, and send the calibrated fault simulation data to the protection system; and is also used to receive and display the setting information corresponding to the fault simulation data; The protection system is used to process the calibrated fault simulation data using a protection formula and a protection exit formula to generate protection exit data corresponding to the fault simulation data.

5. The fault testing platform according to claim 4, characterized in that: The protection system includes a plurality of protection chassis and a plurality of three-out-of-two chassis, each protection chassis being communicatively connected to a corresponding three-out-of-two chassis; Each of the protection chassis is configured to process the calibrated fault simulation data using a protection formula to obtain a plurality of action export data, and send the plurality of action export data to a two-out-of-three chassis corresponding to the protection chassis; Each of the three-out-of-two chassis is used to process the multiple action export data using a protection export formula to obtain protection export data corresponding to the fault simulation data, and send the protection export data to the central control board system through the valve control chassis.

6. The fault testing platform according to claim 4, characterized in that: The central control board system is specifically used to: compare the protection export data generated by the protection system with the expected received data, and if the protection export data is consistent with the expected received data, generate setting information corresponding to the fault simulation data.

7. The fault testing platform according to claim 1, characterized in that: The valve control system includes a valve control chassis, a communication management chassis and a valve control host computer, and the valve control chassis is communicatively connected to the valve control host computer through the communication management chassis; The valve control chassis is configured to forward the setting information corresponding to the fault test data to the valve control host computer via the communication management chassis upon receiving the setting information corresponding to the fault test data; The valve control host computer is used to display the setting information corresponding to the fault test data.

8. The fault testing platform according to claim 1, characterized in that: The central control board system is further configured to obtain a fault simulation command signal and communication test data, and when the fault simulation command signal is at a high level, delay a preset time period from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time period, generate and send a set message indicating that the simulation is successful; The valve control system is further configured to receive and display the setting information indicating successful simulation of the flag.

9. The fault testing platform according to claim 1, characterized in that: The valve control system is also used to obtain a fault simulation command signal and communication test data. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

10. A fault testing method for a network-type converter valve, characterized in that: Applied to the fault testing platform according to any one of claims 1 to 9 above, the fault testing method comprises: Based on the fault test system in the fault test platform, multiple fault test types of the networked converter valve are stored, and fault test data is generated based on each fault test type; Based on the fault test data, the central control board system in the fault test platform uses a multi-level fault debounce algorithm to perform debounce processing to obtain the debounced fault test data, and based on the debounced fault test data, generates setting information corresponding to the fault test data; The valve control system in the fault test platform displays setting information corresponding to the fault test data.

11. The method according to claim 10, characterized in that The fault test data includes a plurality of differential signals; The generating, based on the debounced fault test data, setting information corresponding to the fault test data includes: Based on the multiple differential signals after debounce, a preset error formula is used to calculate and obtain an error value; When the error value is smaller than a preset reference value, setting information corresponding to the fault test data is generated.

12. The method according to claim 11, characterized in that The preset error formula satisfies the following formula: Among them, ERR i is the error value, fon() is the function of fault signal transmission error, x i ,y i , z i are the differential signals after debounce, K p is the error gain coefficient.

13. The method according to claim 10, characterized in that The fault testing method further includes: Based on the real-time digital simulation system in the fault testing platform, running the electrical simulation model of the networked converter valve to generate the fault simulation data and the expected received data corresponding to the fault simulation data; Based on the valve control system, calibrating the fault simulation data to obtain calibrated fault simulation data; Based on the protection system in the fault test platform, according to the calibrated fault simulation data, the protection formula and the protection exit formula are used to process and generate protection exit data corresponding to the fault simulation data; Based on the central control board system, generating setting information corresponding to the fault simulation data according to the expected received data and the protection exit data generated by the protection system; Based on the valve control system, setting information corresponding to the fault simulation data is displayed.

14. The method according to claim 10, characterized in that The method of processing the calibrated fault simulation data using a protection formula and a protection exit formula to generate protection exit data corresponding to the fault simulation data includes: According to the calibrated fault simulation data, the protection formula is used to process it and obtain multiple action output data; The protection exit formula is used to process the plurality of action exit data to obtain protection exit data corresponding to the fault simulation data.

15. The method according to claim 13, characterized in that The generating, according to the expected received data and the protection exit data generated by the protection system, setting information corresponding to the fault simulation data includes: According to the protection exit data generated by the protection system, the protection exit data is compared with the expected received data. If the protection exit data is consistent with the expected received data, setting information corresponding to the fault simulation data is generated.

16. The method according to claim 10, characterized in that The fault testing method further includes: Based on the central control board system, a fault simulation command signal and communication test data are obtained, and when the fault simulation command signal is at a high level, a preset time length is delayed from the detection of a frame header of the communication test data, and if the frame header of the communication test data is not redetected within the preset time length, a set information indicating that the simulation is successful is generated; Based on the valve control system, setting information indicating successful simulation of the flag is displayed.

17. The method according to claim 10, wherein: The fault testing method further includes: Based on the valve control system, a fault simulation command signal and communication test data are obtained. When the fault simulation command signal is at a high level, a preset time length is delayed from the detection of the frame header of the communication test data. If the frame header of the communication test data is not redetected within the preset time length, a setting information indicating that the simulation is successful is generated and displayed.

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