A fault testing platform and fault testing method for a mesh-type converter valve

Abstract

The application relates to a fault test platform and a fault test method of a network-constructed converter valve, wherein the fault test platform stores a plurality of fault test types of the network-constructed converter valve through a fault test system, can efficiently, conveniently and accurately simulate various faults of a valve control system and a valve module, avoids simulating the fault test of the network-constructed converter valve by using simulation software, eliminates the real-time operation characteristics of the network-constructed converter valve which cannot be accurately simulated by offline simulation, the central control board system carries out de-bouncing processing by using a multi-level fault de-bouncing algorithm based on the fault test data, obtains de-bounced fault test data, generates setting information corresponding to the fault test data based on the de-bounced fault test data, can increase the fault verification means of the super-capacitor network-constructed control protection device, improve the simulation accuracy of the real-time operation characteristics of the super-capacitor in the actual network-constructed system, and is beneficial to making a complete verification on the overall control performance and function of the power system.

Description

Technical Field

[0001] This invention relates to the field of power system technology, specifically to a fault testing platform and fault testing method for a grid-type converter valve. Background Technology

[0002] With the increasing penetration of renewable energy sources such as wind and solar power in the power system, power electronic equipment is being widely used. Therefore, the power system is transforming from a traditional system dominated by synchronous generators to a "dual-high" power system with a high proportion of new energy and a high proportion of power electronic equipment. The "dual-high" power system has a relatively low proportion of synchronous generators, leading to low inertia and underdamping problems, and making voltage and frequency stability issues increasingly prominent. Converters in traditional power systems use grid-following control, which cannot provide inertia and damping for the power system.

[0003] Therefore, transforming traditional grid-following control into grid-building control has become a trend. Grid-building converters can simulate synchronous generators to provide inertia and damping for the power system, participate in the regulation of 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 extreme cold, the supply of instantaneous current during power system failures still faces severe challenges, and the stability of the power grid still needs to be strengthened. Therefore, grid control and protection devices with supercapacitors on the grid side will become an important technical means to solve this problem.

[0005] The grid-side supercapacitor configuration provides stable voltage support and rapid current output for the entire power system. Supercapacitors possess characteristics such as high overload capacity, rapid response, and strong active power support. Furthermore, their presence on the DC side of the grid control and protection device results in numerous and complex power electronic devices. Currently, the verification of their control strategies and protection algorithms primarily relies on software simulation, which cannot accurately simulate the real-time operating characteristics of actual supercapacitor-based grid control and protection devices. This hinders a comprehensive verification of the overall control performance and functionality of the power system. Summary of the Invention

[0006] To address the existing problems in the prior art, the present invention provides a fault testing platform for a grid-type converter valve. 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 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 for the network-type converter valve, and to generate and send fault test data based on each fault test type.

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

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

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

[0013]

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

[0015] Optionally, 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 through different communication interfaces;

[0016] The real-time digital simulation system is used to run the electrical simulation model of the network-type 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 used to receive the fault simulation data and the expected received data, and forward the fault simulation data to the valve control system; it is also used to generate setting information corresponding to the fault simulation data based on the expected received data and the protection output data generated by the protection system.

[0018] The valve control system is used to calibrate the fault simulation data to obtain calibrated fault simulation data and send the calibrated fault simulation data to the protection system; it 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 protection formulas and protection output formulas to generate protection output data corresponding to the fault simulation data.

[0020] Optionally, the protection system includes multiple protection enclosures and multiple 3-out-of-2 enclosures, with each protection enclosure being communicatively connected to a corresponding 3-out-of-2 enclosure;

[0021] Each of the protection enclosures is used to process the calibrated fault simulation data using a protection formula to obtain multiple action output data, and then send the multiple action output data to the three-out-of-two enclosure corresponding to the protection enclosure.

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

[0023] Optionally, the central control board system is specifically used to: compare the protection output data generated by the protection system with the expected received data; if the protection output data and the expected received data are consistent, generate the 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, wherein the valve control chassis is communicatively connected to the valve control host computer through the communication management chassis;

[0025] The valve control chassis is used to forward the set information corresponding to the fault test data to the valve control host computer through the communication management chassis when the set information corresponding to the fault test data is received.

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

[0027] Optionally, the central control board system is also used to acquire fault simulation command signals and communication test data. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and sent.

[0028] The valve control system is also used to receive and display the setting information of the flag simulation being successful.

[0029] Optionally, the valve control system is further configured to acquire fault simulation command signals and communication test data. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and displayed.

[0030] Based on the same inventive concept, this invention also provides a fault testing method for a network-type converter valve, applied to the aforementioned fault testing platform, wherein the fault testing method includes:

[0031] Based on the fault testing system in the fault testing platform, multiple fault test types of the network-type 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 debouncing algorithm to perform debouncing processing to obtain debouncing fault test data. Based on the debouncing fault test data, the corresponding setting information of the fault test data is generated.

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

[0034] Optionally, the fault test data includes multiple differential signals;

[0035] The step of generating position information corresponding to the fault test data based on the debouncing fault test data includes:

[0036] Based on multiple differential signals after debouncing, the error value is calculated using a preset error formula;

[0037] When the error value is less than the preset reference value, the 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 x is the error value, fon() is a function of the fault signal transmission error, and x i y i , z i These are the differential signals after debouncing, K p This 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 test platform, the electrical simulation model of the network-type converter valve is run to generate the fault simulation data and the expected received data corresponding to the fault simulation data.

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

[0044] Based on the protection system in the fault test platform, the protection output data corresponding to the fault simulation data is generated by processing the calibrated fault simulation data using protection formulas and protection output formulas.

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

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

[0047] Optionally, the step of processing the calibrated fault simulation data using protection formulas and protection output formulas to generate protection output data corresponding to the fault simulation data includes:

[0048] Based on the calibrated fault simulation data, the protection formula is used to process the data to obtain multiple action output data.

[0049] Based on the multiple action exit data, the protection exit formula is used to process the data to obtain the protection exit data corresponding to the fault simulation data.

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

[0051] Based on the protection output data generated by the protection system, the protection output data is compared with the expected received data. If the protection output data and the expected received data are consistent, the 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, fault simulation command signals and communication test data are acquired. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated.

[0054] Based on the valve control system, the system displays the setting information of the flag simulation as successful.

[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 acquired. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and displayed.

[0057] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0058] This invention provides a fault testing platform and method for a grid-type converter valve. The fault testing platform stores multiple fault test types for the grid-type converter valve through a fault testing system, enabling efficient, convenient, and accurate simulation of various faults in the valve control system and valve modules. This avoids the need for simulation software to simulate fault tests of the grid-type converter valve, thus eliminating the inability of offline simulation to accurately simulate the real-time operating characteristics of the grid-type converter valve. Based on the fault test type, fault test data is generated. The central control board system uses a multi-level fault debouncing algorithm to debouncing the fault test data, obtaining debouncing fault test data. Based on the debouncing fault test data, corresponding position information is generated. This enhances the fault verification methods for supercapacitor-type grid control and protection devices, improves the simulation accuracy of the real-time operating characteristics of supercapacitors in actual grid systems, and facilitates comprehensive verification of the overall control performance and functions of the power system. Attached Figure Description

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

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

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

[0062] Figure 4 An architecture diagram of an electrical simulation model of a supercapacitive grid converter valve provided by the present invention;

[0063] Figure 5 This invention provides a fault simulation diagram of an RTDS system transmitting fault information.

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

[0065] Figure 7 A process diagram illustrating the generation of communication-related faults provided by this invention;

[0066] Figure 8 This is a schematic diagram of the structure of a fault testing platform for a mesh-type converter valve provided by the present invention. Detailed Implementation

[0067] Example 1:

[0068] Figure 1 A block diagram of a fault testing platform for a mesh-type converter valve provided by the present invention is shown below. Figure 1 As shown, the fault testing platform includes a central control board system, a fault testing system, and a valve control system. The central control board system is communicatively connected to the valve control system and the fault testing system. The fault testing system is used to store multiple fault test types for the network-type converter 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, perform debouncing processing using a multi-level fault debouncing algorithm based on the fault test data to obtain 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] The fault testing system can include: a fault testing host computer, a network switch, and a valve-controlled fault simulation chassis. The fault testing host computer can also be called a fault simulation host computer. The central control board system can include: an AURORA adapter box for MMC (Modular Multilevel Converter) and an overcapacity AURORA adapter box. The valve control system can also be called the valve control system of an overcapacity network control and protection device, and includes three parts: a valve control chassis, a communication management chassis, and a valve control host computer. Setting information can 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 network control and protection device, and the fault testing platform can also be called a fault simulation testing platform.

[0070] It should be noted that the fault simulation host computer can be used to display, for example... Figure 2The host computer fault simulation interface of the supercapacitor-type network control and protection device shown includes fault selection interfaces for SM (Submodule) and supercapacitor modules (CCU) (i.e., MMC submodule fault type selection interface and supercapacitor submodule fault type selection interface), as well as SM fault module selection and setting interfaces, supercapacitor fault module selection and setting interfaces, and network setting interfaces. The SM fault selection interface mainly includes SM fault type, SM fault number, SM network configuration, etc.; for example, the SM fault selection interface (i.e., MMC submodule fault type selection interface) can include SM body fault type, SM overvoltage protection type, overcurrent protection type, SM communication fault type, SM power supply type, and bypass type, etc. The supercapacitor CCU fault selection interface mainly includes CCU unit body fault type and supercapacitor CCU protection fault type, etc. For example, the fault selection interface of the overcapacity CCU (i.e., the fault type selection interface of the overcapacity submodule) may include: CCU individual fault, CCU circuit breaker fault, CCU fuse fault, and SM body fault, SM overvoltage protection, overcurrent protection, SM communication fault, SM power supply and bypass, etc.

[0071] The fault testing platform of this invention has strong advantages in terms of fault test types, fault test combinations, and test functions. It can test 80 types of faults, including faults of sub-modules and faults of overcapacity CCUs. It can also generate protection-type faults, making the fault testing more comprehensive.

[0072] The fault test host computer sends multiple fault test types to the AURORA adapter box of the supercapacitor or the AURORA adapter box of the MMC through the network switch and communication management chassis. Based on the fault test data, the AURORA adapter box of the supercapacitor or the AURORA adapter box of the MMC generates the setting information corresponding to the fault test data and sends it to the valve control system. The setting information is then displayed on the valve control host computer.

[0073] The information flow of the fault simulation test platform for supercapacitive network converter valves based on RTDS (Real-Time Digital Simulator) (i.e., the fault test platform for network converter valves) will interact between the aforementioned chassis. The fault simulation interface chassis (i.e., the valve control chassis) is equipped with a host computer operation interface, which covers faults in all submodules of the two branches, parallel capacitor faults in submodules, protection faults in submodules, and communication faults in submodules.

[0074] The signals sent by the fault simulation host computer directly affect the IP cores in the AURORA adapter box through the switch communication. The basic process of IP operation is as follows: to realize direct communication and cross communication with the valve control chassis and adjacent IPs, thereby realizing the reception and decoding of downlink commands, the encoding and transmission of uplink data, simulating the working logic of related power supplies, over and undervoltage protection circuits, bypass switches and other components in the simulation submodule, outputting the physical status of the submodule, and realizing fault simulation according to 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, perform debouncing processing based on the multiple differential signals using a multi-level fault debouncing algorithm, and obtain multiple debouncing differential signals; calculate the error value based on the multiple debouncing differential signals using a preset error formula; and generate the set information corresponding to the fault test data when the error value is less than a preset reference value.

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

[0077]

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

[0079] For example, the fault simulation host computer is started. Connected to the valve control fault simulation chassis via a network switch, the corresponding fault types are set in the host computer software according to factory test requirements. Faults are set one by one or in combination to reliably and accurately simulate various faults that may occur in the actual operation of the valve control system and valve modules, thereby verifying the control strategy of the valve control system and the fault response capability of the valve modules. The fault simulation host computer simulates a submodule fault by setting faults. Taking the abnormal power supply of module 5 in branch 1 as an example, the specific operation is as follows:

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

[0081] Click on the "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 iIn the "Network Settings" interface, determine whether to send the aforementioned fault signal (_Err_Tx). Furthermore, the fault signal Pow... i _Err_Tx0、Pow i _Err_Tx1 and Pow i The _Err_Tx signal is transmitted via Ethernet to the MMC's AURORA adapter box or an overcapacitated AURORA adapter box. Upon receiving this fault signal, the IP core of the AURORA adapter box performs multi-level fault debouncing processing, i.e., Pow... i _Err_Rx0、Pow i _Err_Rx1 and Pow i _Err_Rx.

[0082]

[0083] The fon() function calculates the transmission error value of the fault signal, Kp represents the error gain coefficient, and ERR... i It 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 When using the preset reference value (i.e., 0.1), the fault simulation parameters are considered successfully set, and the Pow bit is set. i _Err_Flag.

[0085] Pow i The _Err_Flag is transmitted via high-speed fiber optic cable to the MMC valve control chassis or overcapacity valve control chassis. Ultimately, the fault information of this submodule is displayed on the valve control host computer. i A value of 1 for _Err_Flag indicates that the fault has been set successfully.

[0086] Figure 3 A block diagram of a fault testing platform for a mesh-type converter valve provided by the present invention is shown below. Figure 3As shown, the fault testing platform further 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 network-type 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. It is also used to generate the setting information corresponding to the fault simulation data based on the expected received data and the protection output data generated by the protection system. The valve control system is used to calibrate the fault simulation data to obtain calibrated fault simulation data, and send the calibrated fault simulation data to the protection system. It 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 protection formulas and protection output formulas to generate the protection output data corresponding to the fault simulation data.

[0087] The RTDS system utilizes the NovaCor hardware simulation platform. Based on the order of magnitude of the simulation models, it is configured with one NovaCor unit and several GTFPGA units. NovaCor runs the simulation models, while the GTFPGA simulates the states of the simulation valve modules. The protection system, also known as the protection system for the supercapacitive network control protection device, includes a protection AURORA adapter box, an MMC protection chassis, a supercapacitive protection chassis, a MMC 3-out-of-2 chassis, and a supercapacitive 3-out-of-2 chassis. The protection AURORA adapter box forwards and processes information such as submodule voltage and submodule bypass status sent by the GTFPGA. The MMC protection chassis provides protection actions based on the information from the protection AURORA chassis, and the 3-out-of-2 chassis provides exit behavior based on information from the three sets of protections. The supercapacitive protection processing method is the same. The fault simulation platform for the supercapacitive network control protection device interacts with data via the Ethernet protocol of the supercapacitive AURORA adapter box, which is relatively simple and easy to configure.

[0088] It should be noted that the fault testing platform provided by this invention can not only test the faults of the supercapacitive grid-connected converter valve using fault test data generated by the fault testing system, but also test the faults of the supercapacitive grid-connected converter valve using fault simulation data generated by the real-time digital simulation system based on the electrical simulation model of the grid-connected converter valve. The electrical simulation model of the supercapacitive grid-connected converter valve adopts a modular multilevel converter (MMC) plus supercapacitor topology. The modular multilevel converter contains three phases and six arms, and the two branches of the supercapacitor are connected in parallel on the DC side of the modular multilevel converter. The supercapacitive power topology (i.e., the modular multilevel converter plus supercapacitor topology) is a novel topology in the field of power system grid construction.

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

[0090] 1) The simulation model of the supercapacitive grid converter valve adopts a modular multilevel converter topology on the left. The number of sub-modules (SM) 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 sub-modules must be used in conjunction with the number of GTPGA units in the RTDS system.

[0091] 2) The simulation model has two supercapacitor branches connected in parallel on the DC side. Each supercapacitor unit includes a submodule body and a supercapacitor. The module body and the capacitor are connected through a circuit breaker and a fuse. When the supercapacitor 3-out-of-2 chassis determines that the current bridge arm current and module voltage values ​​have exceeded the limit or returned to below the set value, the supercapacitor can trip or reset according to the action conditions.

[0092] The fault testing platform also includes: a computer system used to build and compile the electrical simulation model of the supercapacitive network control and protection device, i.e., the computer (or computer system) uses RSCARD software to build and compile the electrical simulation model of the supercapacitive network converter valve; an RTDS system used to run the compiled electrical simulation model of the supercapacitive network control and protection device, i.e., simulating the real converter valve; and a central control board system used to forward and process RTDS data and simultaneously send fault status information to the valve module to simulate faults occurring in the real submodule. The IP core of the chassis core board embeds all the fault interfaces of the submodules, used to set and clear various fault information of the submodules, thereby simulating various types of faults that the valve module may encounter in actual operation. The submodule information in the RTDS simulation model is transmitted to the IP core in the fault simulation interface chassis for use. The valve control system of the supercapacitive network control and protection device has a valve control chassis. The core board of the valve control device adopts an FPGA (Field Programmable Gate Array) + ARM (Advanced Reduced Instruction Set Machine) processing architecture. It includes an MMC valve control chassis and a supercapacitive valve control chassis. Each chassis contains two core boards and several interface boards. The core boards are used to process the core algorithms and interact with the RTDS model. The interface boards are used to interact with the IP cores in the interface chassis and transmit information to the core boards.

[0093] The valve control system of the supercapacitive grid 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 supercapacitive grid control and protection device; the protection system is used to realize the action protection of the converter valve; the central control board system is a software control system that manages the sub-modules in the converter valve, and each sub-module has a corresponding central control board.

[0094] This invention provides a test platform for an overcapacitance network converter valve based on RTDS. The platform uses the aforementioned fault simulation test platform for overcapacitance network converter valves based on RTDS to test the valve. The method includes: setting the operating mode of the overcapacitance network control and protection device and configuring the corresponding power supply and load in the RTDS software; the RTDS system sending electrical and switching quantities to the fault simulation interface chassis according to the electrical simulation model of the overcapacitance network control and protection device; the fault simulation interface chassis receiving fault information from RTDS, SM communication fault information, SM body fault information, protection fault information, and fault information issued by the fault simulation host computer; its peripheral modules and IP cores issuing control commands to generate corresponding fault signals based on the received electrical and switching quantities; and the system operating status of the overcapacitance network control and protection device being observed through the host computer of the valve control chassis and the monitoring interface in the RTDS simulation model.

[0095] Optionally, the protection system includes multiple protection enclosures and multiple 3-out-of-2 enclosures, with each protection enclosure communicatively connected to a corresponding 3-out-of-2 enclosure. Each protection enclosure is used to process calibrated fault simulation data using a protection formula to obtain multiple action output data, and then send the multiple action output data to the corresponding 3-out-of-2 enclosure. Each 3-out-of-2 enclosure is used to process the multiple action output data using a protection output formula to obtain protection output data corresponding to the fault simulation data, and then send the protection output data to the central control board system through the valve control enclosure.

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

[0097] For example, the fault originates from the RTDS model. The fault is determined by the IP cores inside the AURORA adapter box. The fault handling process is as follows: Figure 5 As shown, taking a hardware overcurrent circuit as an example, the specific steps are as follows:

[0098] During normal operation of the RTDS system, the current of the overcapacity branch submodule of the converter valve, generated by the RSCAD simulation model, is C. si Simulates fault current, and the RTDS system simultaneously provides the expected received reference value (i.e., expected received data) Z for the fault simulation. ref_C_si Submodule current C si And expected received reference value Z ref_C_si The current value is sent via GTFPGA to the AURORA adapter box of the supercapacitor. The IP core is the physical model of the analog submodule. The current value of the submodule is sent to the supercapacitor valve control chassis (i.e., the valve control chassis). After receiving the fault current, the valve control chassis performs calibration processing to obtain C. si_0 This current value will be sent to the overcapacity protection enclosure; there are three overcapacity protection enclosures, and the current reference value in any one of them is C. ref The three protection chassis core boards perform corresponding actions according to the protection formula, output Fc1 i Fc2 i Fc3 i The three-out-of-two chassis receives the action outputs of three protection chassis, and obtains the protection output flag Fc according to the protection output formula. i The valve control unit sends this signal to the central control board system; the central control board system receives this fault simulation signal and records it as R_Fc. i Compare R_Fc i And expected received reference value Z ref_C_siCheck if the two are consistent; if they are consistent, then generate a return value T_Fc. i The true value is 1, otherwise it is 0; the overcapacity valve control chassis receives the above return value T_Fc. i After processing, the data 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 of setting the 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. 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 set information corresponding to the fault test data to the valve control host computer through the communication management chassis when it receives the set information corresponding to the fault test data. The valve control host computer is used to display the set 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 supercapacitive network control and protection device is used to display key information of the entire valve control system and valve protection system and to realize some parameter setting functions.

[0102] The fault simulation platform and method in this invention are applied to a fault simulation test platform (i.e., fault test platform) for network converter valves (i.e., overcapacity network converter valves). The test platform for overcapacity network converter valves consists of a model computer, an RTDS system, a valve control system, a protection system, and a fault simulation host computer system. The RTDS system in the fault simulation test platform is coordinated by a NovaCor chassis and a GTFPGA. The valve control system uses an MMC Aurora adapter box, an overcapacity AURORA adapter box, an MMC valve control chassis, an overcapacity valve control chassis, and a valve control host computer. The protection system uses an Aurora adapter box, an MMC protection chassis, an overcapacity protection chassis, an MMC three-out-of-two chassis, and an overcapacity three-out-of-two chassis. The MMC Aurora adapter box and the overcapacity AURORA adapter box are equipped with independent fault interfaces. The simulation host computer can transmit fault signals through this interface; the electrical simulation model of the supercapacitive grid converter valve consists of three phase units of the MMC and two independent supercapacitive branches; the voltage level and number of modules of each MMC phase unit module in the electrical simulation model of the supercapacitive grid converter valve are configurable and determined according to the MMC control strategy. The supercapacitive unit in the supercapacitive branch is composed of the sub-module body and the supercapacitor connected in parallel in a certain way, and the number of supercapacitive units in each branch can be dynamically adjusted according to the supercapacitive control strategy; the fault simulation host computer interface of the grid converter valve fault simulation test platform generally has the simulated fault types of the MMC bridge arm sub-module and the sub-module of the supercapacitive branch; the fault types of the fault simulation test platform include module body faults, communication faults, protection faults and combined faults; the validity of the fault simulation signal issued by the fault simulation host computer is judged by the formula fon(). Fault simulation information (i.e., fault simulation data) for protection can be generated through RTDS simulation models and used in conjunction with protection systems to generate fault simulation signals; fault simulation information for communication is tested using variable frames.

[0103] Optionally, the central control board system is also used to acquire fault simulation command signals and communication test data. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and sent.

[0104] The valve control system is also used to receive and display the setting information of the flag simulation being successful.

[0105] Optionally, the valve control system is further configured to acquire fault simulation command signals and communication test data. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and displayed.

[0106] It should be noted that the fault testing platform provided by this invention can also be used to test communication faults generated by the platform. That is, the protection system or the central control board system sends fault simulation command signals and communication test data to the valve control system. The valve control system detects whether a communication fault has occurred based on the acquired fault simulation command signals and communication test data. Alternatively, the fault testing system, the RTDS system, or the protection system sends fault simulation command signals and communication test data to the central control board system. The central control board system detects whether a communication fault has occurred based on the acquired fault simulation command signals and communication test data.

[0107] For example, a communication-related fault is generated through the peripheral module of the interface chassis, and the IP core determines the fault. The central control board system sends data to the valve control chassis, and its simplified process is as follows: Figure 6 As shown, this flowchart is applicable to communication timeouts, communication checksum errors, and communication disconnections. Taking a timeout in valve-controlled communication as an example, the specific steps are as follows:

[0108] Timing processing of communication classes, such as Figure 7 As shown, ① represents the fault simulation command parameters, ② represents the fiber optic communication before fault simulation processing, and ③ represents the fiber optic communication after fault processing.

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

[0110] When a frame header is detected, if the fault simulation command signal ① is high at this time, then a delay of m bits is made from the time the frame header is detected, so that ③ remains high when the frame header should be transmitted. The delay of ③ compared to ② by n bits allows time for the frame header to be detected in the fault simulation logic. The parameters m, n, and z must be designed according to the specific project; otherwise, the variable frame method may not achieve the intended effect. z can be multiple frames of data, and CRC can be a cyclic redundancy check.

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

[0112] Overall framework of the fault simulation test platform for supercapacitive grid control and protection devices:

[0113] like Figure 8As shown, the fault simulation test platform for the supercapacitive grid-connected control and protection device based on RTDS in this embodiment of the invention includes a computer equipped with the power system auxiliary design tool RSCAD software, a real-time digital simulator (RTDS) system, a valve control system, a protection system, and a fault simulation host computer for the supercapacitive grid-connected control and protection device. The RSCAD software is used to establish the electrical simulation model of the supercapacitive grid-connected control and protection device. The computer has an Ethernet port with correctly installed drivers for communication between the RSCAD software and the RTDS system. The RTDS system runs the compiled electrical simulation model of the supercapacitive grid-connected control and protection device, using Ethernet for high-speed communication. The processor is the NovaCor hardware simulation platform, and it is also configured with several high-speed computing units (GTFPGA). The protection system is configured with a protection AURORA adapter box, an MMC protection chassis, a supercapacitive protection chassis, a MMC three-out-of-two chassis, and a supercapacitive three-out-of-two chassis, mainly to simulate and correctly operate the protection function of the valve control device. The valve control device of the supercapacitive grid-connected 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 supercapacitive network control and protection device is equipped with a core board and several interface boards for processing valve control logic and receiving submodule information; the MMC AURORA adapter box and the supercapacitive 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 a network switch. This host computer can comprehensively, accurately and purposefully generate faults in valve modules and valve control systems.

[0114] The test platform and method for the grid-connected converter valve based on RTDS in this embodiment of the invention are carried out according to the following steps:

[0115] S1, the computer, RTDS system, valve control device of the supercapacitive network control and protection device, and fault simulation host computer are arranged according to Figure 1 A test platform for the entire network system was established using this method. The RSCAD simulation software communicates with the NovaCor simulation hardware via Ethernet protocol. The protection system and valve control system communicate with NovaCor and GTFPGA respectively via Ethernet protocol. NovaCor and GTFPGA are connected via optical fiber.

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

[0117] S3: Start the RTDS system, valve control chassis, protection chassis, and fault simulation chassis; run the RTDS simulation system; the RTDS system sends submodule voltage U to the protection transfer box and valve control transfer box. i Current signal I i and switch state S i wait.

[0118] S4, activate the valve control device. The valve control device operates according to the preset control strategy NLM and the received voltage U. i Current signal I i and switch state S i Send pulse control command MV i The modulation effect of the control strategy is monitored in RSCAD software.

[0119] Steps S1-S4 are common to all fault testing methods.

[0120] In summary:

[0121] This invention proposes a fault simulation test platform and method for supercapacitive network converter valves based on RTDS, as well as a fault simulation platform and method for supercapacitive network control and protection devices. This represents a novel fault testing platform and method in the field of network 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 for the supercapacitive network control and protection device. The supercapacitive network control and protection device built on this test platform can effectively represent the electrical characteristics of the supercapacitive network converter valve and achieve the expected control effect. The fault simulation test platform, built based on the RTDS system, protection system, and valve control system, can efficiently, conveniently, and accurately simulate various faults occurring in the valve control system and valve modules, increasing the fault verification methods for supercapacitive network control and protection devices.

[0122] Example 2:

[0123] Based on the same inventive concept, this invention also provides a fault testing method for a network-type converter valve, applied to the aforementioned fault testing platform, wherein the fault testing method includes:

[0124] Based on the fault testing system in the fault testing platform, multiple fault test types of the network-type 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 debouncing algorithm to perform debouncing processing to obtain debouncing fault test data. Based on the debouncing fault test data, the corresponding setting information of the fault test data is generated.

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

[0127] Optionally, the fault test data includes multiple differential signals;

[0128] The step of generating position information corresponding to the fault test data based on the debouncing fault test data includes:

[0129] Based on multiple differential signals after debouncing, the error value is calculated using a preset error formula;

[0130] When the error value is less than the preset reference value, the 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 x is the error value, fon() is a function of the fault signal transmission error, and x i y i , z i These are the differential signals after debouncing, K p This 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 test platform, the electrical simulation model of the network-type converter valve is run to generate the fault simulation data and the expected received data corresponding to the fault simulation data.

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

[0137] Based on the protection system in the fault test platform, the protection output data corresponding to the fault simulation data is generated by processing the calibrated fault simulation data using protection formulas and protection output formulas.

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

[0139] Based on the valve control system, the 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 this invention can not only generate fault test data through the fault test system in the fault test platform to test the network-type converter valve, but also generate fault simulation data through the implementation of a digital simulation system to test the network-type converter valve, thereby improving the practicality of the fault testing method.

[0141] Optionally, the step of processing the calibrated fault simulation data using protection formulas and protection output formulas to generate protection output data corresponding to the fault simulation data includes:

[0142] Based on the calibrated fault simulation data, the protection formula is used to process the data to obtain multiple action output data.

[0143] Based on the multiple action exit data, the protection exit formula is used to process the data to obtain the protection exit data corresponding to the fault simulation data.

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

[0145] Based on the protection output data generated by the protection system, the protection output data is compared with the expected received data. If the protection output data and the expected received data are consistent, the 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, fault simulation command signals and communication test data are acquired. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated.

[0148] Based on the valve control system, the system displays the setting information of the flag simulation as successful.

[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 acquired. When the fault simulation command signal is high, a preset time delay is set from the detection of the frame header of the communication test data. If the frame header of the communication test data is not detected again within the preset time, a setting information indicating successful simulation is generated and displayed.

[0151] It should be noted that the fault testing method provided by the present invention can also detect communication faults of the fault testing platform through the central control board system and the valve control system, so as to avoid errors in the testing of the grid-type converter valve caused by communication faults 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 within the scope of the claims of the present invention pending approval.

Claims

1. A fault testing platform for a network-forming converter valve, characterized in that The fault test platform comprises a central control board system, a fault test system and a valve control system, the central control board system is in communication connection with the valve control system and the fault test system respectively; The fault test system is configured to store a plurality of fault test types of the network-constructed thyristor 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 de-bouncing processing on the fault test data based on a multi-level fault de-bouncing algorithm to obtain de-bounced fault test data, and generate setting information corresponding to the fault test data based on the de-bounced fault test data; The valve control system is configured to receive and display the setting information corresponding to the fault test data; The central control board system is specifically configured to receive a plurality of differential signals, perform de-bouncing processing on the plurality of differential signals based on the plurality of differential signals by using a multi-level fault de-bouncing algorithm to obtain de-bounced differential signals, calculate an error value based on the de-bounced differential signals by using a preset error formula, and generate the setting information corresponding to the fault test data when the error value is less than a preset reference value, wherein the fault test data comprises the plurality of differential signals; The preset error formula satisfies the following formula: wherein, ERR i is an error value, fon() is a function of the fault signal transmission error, x i ，y i ，z i are respectively a de-bounced differential signal, K p is an error gain coefficient.

2. The fault testing platform of claim 1, wherein, The fault test platform further comprises a protection system and a real-time digital simulation system, the protection system is in communication connection with the valve control system, and the central control board system is connected with the real-time digital simulation system through different communication interfaces; The real-time digital simulation system is configured to run an electrical simulation model of the network-constructed thyristor valve, generate fault simulation data and expected receiving data corresponding to the fault simulation data, and send the fault simulation data and the expected receiving data to the central control board system; The central control board system is configured to receive the fault simulation data and the expected receiving data, forward the fault simulation data to the valve control system, and generate setting information corresponding to the fault simulation data based on the expected receiving data and protection export data generated by the protection system; The valve control system is configured to calibrate the fault simulation data to obtain calibrated fault simulation data, send the calibrated fault simulation data to the protection system, and receive and display the setting information corresponding to the fault simulation data; The protection system is configured to process the calibrated fault simulation data by using a protection formula and a protection export formula to generate protection export data corresponding to the fault simulation data.

3. The fault testing platform of claim 2, wherein, The protection system comprises a plurality of protection cabinets and a plurality of two-out-of-three cabinets, each protection cabinet is in communication connection with a corresponding two-out-of-three cabinet; Each protection cabinet is configured to process the calibrated fault simulation data by using a protection formula to obtain a plurality of action export data, and send the plurality of action export data to the two-out-of-three cabinet corresponding to the protection cabinet. Each of the three-to-two cabinets is configured to process, based on the plurality of action outlet data, using a protection outlet formula to obtain protection outlet data corresponding to the fault simulation data, and transmit the protection outlet data to the central control panel system through the valve control cabinet.

4. The fault testing platform of claim 2, wherein, The central control panel system is specifically configured to: based on the protection outlet data generated by the protection system, compare the protection outlet data with the expected receiving data, and if the protection outlet data is consistent with the expected receiving data, generate setting information corresponding to the fault simulation data.

5. The fault testing platform of claim 1, wherein, The valve control system includes a valve control cabinet, a communication management cabinet, and a valve control upper computer, and the valve control cabinet is in communication connection with the valve control upper computer through the communication management cabinet; The valve control cabinet is configured to, when receiving the setting information corresponding to the fault test data, forward the setting information corresponding to the fault test data to the valve control upper computer through the communication management cabinet; The valve control upper computer is configured to display the setting information corresponding to the fault test data.

6. The fault test platform of claim 1, wherein The central control panel system is further configured to acquire a fault simulation command signal and communication test data, and when the fault simulation command signal is at a high level, delay for a preset time period from detecting a frame header of the communication test data, and if the frame header of the communication test data is not re-detected within the preset time period, generate and send setting information indicating a successful simulation; The valve control system is further configured to receive and display the setting information indicating a successful simulation.

7. The fault test platform of claim 1, wherein The valve control system is further configured to acquire a fault simulation command signal and communication test data, and when the fault simulation command signal is at a high level, delay for a preset time period from detecting a frame header of the communication test data, and if the frame header of the communication test data is not re-detected within the preset time period, generate and display setting information indicating a successful simulation.

8. A method of testing a network-forming converter valve for faults, characterized in that The fault test method is applied to the fault test platform of any one of claims 1-7, and the fault test method comprises: Based on the fault test system in the fault test platform, a plurality of fault test types of a networked thyristor valve are stored, and based on each fault test type, fault test data is generated; Based on the central control panel system in the fault test platform, based on the fault test data, a multi-level fault de-bouncing algorithm is used for de-bouncing processing to obtain de-bounced fault test data, and based on the de-bounced fault test data, setting information corresponding to the fault test data is generated; Based on the valve control system in the fault test platform, the setting information corresponding to the fault test data is displayed; The generation of the setting information corresponding to the fault test data based on the de-bounced fault test data comprises: Based on the de-bounced plurality of differential signals, a preset error formula is used for calculation to obtain an error value; When the error value is less than a preset reference value, the setting information corresponding to the fault test data is generated, and the fault test data includes a plurality of differential signals; The preset error formula satisfies the following formula: wherein, ERR i is an error value, fon() is a function of the fault signal transmission error, x i ，y i ，z i are respectively a de-bounced differential signal, K p is an error gain coefficient.

9. The method of claim 8, wherein, The fault test method further comprises: Based on the real-time digital simulation system in the fault test platform, running the electrical simulation model of the network-forming converter valve to generate the fault simulation data and the expected receiving 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, processing the calibrated fault simulation data by using the protection formula and the protection export formula to generate the protection export data corresponding to the fault simulation data; Based on the central control board system, generating the setting information corresponding to the fault simulation data according to the expected receiving data and the protection export data generated by the protection system; Based on the valve control system, displaying the setting information corresponding to the fault simulation data.

10. The method of claim 8, wherein, The processing of the calibrated fault simulation data by using the protection formula and the protection export formula to generate the protection export data corresponding to the fault simulation data comprises: Processing the calibrated fault simulation data by using the protection formula to obtain a plurality of action export data; Processing the plurality of action export data by using the protection export formula to obtain the protection export data corresponding to the fault simulation data.

11. The method of claim 10, wherein, The generation of the setting information corresponding to the fault simulation data according to the expected receiving data and the protection export data generated by the protection system comprises: Comparing the protection export data with the expected receiving data according to the protection export data generated by the protection system, and if the protection export data is consistent with the expected receiving data, generating the setting information corresponding to the fault simulation data.

12. The method of claim 8, wherein, The fault test method further comprises: Based on the central control board system, acquiring the fault simulation command signal and the communication test data, and when the fault simulation command signal is at a high level, delaying for a preset time length from detecting the frame header of the communication test data, and if the frame header of the communication test data is not re-detected within the preset time length, generating the setting information indicating the simulation success; Based on the valve control system, displaying the setting information indicating the simulation success.

13. The method of claim 8, wherein, The fault test method further comprises: Based on the valve control system, acquiring the fault simulation command signal and the communication test data, and when the fault simulation command signal is at a high level, delaying for a preset time length from detecting the frame header of the communication test data, and if the frame header of the communication test data is not re-detected within the preset time length, generating and displaying the setting information indicating the simulation success.

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