A full-closed-loop test platform and method for a high-voltage direct current transmission valve control system

Abstract

The present invention relates to the field of power automation technology, and particularly to a full-closed-loop test platform and method for a high-voltage direct current (HVDC) valve control system. The test platform includes a control and protection system, an HVDC thyristor-level equivalent simulation device, and a 12-pulse DC back-to-back physical dynamic model device that are interconnected to form a closed loop and are used to connect multiple thyristor trigger monitoring units of the HVDC valve control system to be tested. It can perform full-closed-loop tests on the HVDC valve control system and can comprehensively test the functions and reliability of the HVDC valve control system to be tested under the full engineering configuration of software and hardware. This system can achieve tests in various situations and solve the problem of single test scenarios in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of power automation, and particularly to a full-closed loop test platform and method for a high-voltage direct current (HVDC) transmission valve control system. Background Art

[0002] The valve control system is the "brain" of the HVDC converter valve and plays a key role in the AC / DC power conversion function of the converter valve. The valve control system monitors each thyristor stage in the converter valve in real time to implement the control and protection strategy of the converter valve. Its reliability directly affects the safe and stable operation of the converter valve and even the entire HVDC transmission project.

[0003] The HVDC transmission valve control system mainly includes multiple thyristor trigger monitoring units (TTMs) and valve base electronics (VBEs), which are the core devices for controlling the HVDC transmission valve control system, as Figure 1 shown. Among them, the thyristor trigger monitoring unit (TTM) serves as the underlying control and protection unit of the converter valve, mainly completing the functions of triggering, monitoring, and protecting the thyristor. The valve base electronics (VBE) is the intermediate link connecting the upper control and protection system and the underlying thyristor trigger monitoring unit, used to receive the control commands of the upper control and protection system and achieve the synchronous triggering of multiple-stage thyristors and the information interaction of multiple information states. As mentioned above, the HVDC transmission valve control system not only has complex functions itself, but also has a large number of signal interfaces and very complex logic. The development of the interface and function equivalence is its difficulty.

[0004] Currently, the methods commonly used by domestic valve control system manufacturers to verify the functions and reliability of valve control systems are as Figure 2 shown. Specifically:

[0005] The HVDC transmission valve control system is tested by using a discrete test method, that is, the VBE is verified for its functions and interfaces with the DC control and protection system using a digital simulation platform, but the TTM link is missing, and it is not a complete valve control system closed-loop test platform. The interface functions between the valve base electronics (VBE) and the thyristor trigger monitoring unit (TTM) are completed through an independent test platform, and it is an open-loop test system, which cannot completely simulate various working conditions and interface characteristics of the valve control system. In addition, limited by the test capabilities of the test platform, the current test method uses digital simulation equipment to simulate the converter valve, and can only achieve functional tests under the simplified configuration of the valve control system. The software and hardware configurations of the valve control system participating in the test are quite different from those in the actual project, and they are all simplified versions, having defects such as being unable to achieve tests under the software and hardware configurations of the valve control system project and incomplete simulation of working conditions. That is to say, the existing test platform valve control system project has low equivalence and cannot fully simulate the software, hardware, and interface logic of the valve control system. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a full-closed-loop test platform and method for a high-voltage direct current (HVDC) valve control system in view of the deficiencies of the prior art.

[0007] The technical solution of a full-closed-loop test platform for a high-voltage direct current valve control system of the present invention is as follows:

[0008] It includes: a control and protection system, an HVDC thyristor-level equivalent simulation device, and a 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the HVDC valve control system to be tested;

[0009] The HVDC thyristor-level equivalent simulation device is used to: equivalently simulate the working state of the valve base electronic equipment of the HVDC valve control system to be tested, obtain the operation parameter data of the valve base electronic equipment, generate a control signal according to the operation parameter data of the valve base electronic equipment, and output the control signal to the 12-pulse DC back-to-back physical dynamic model device;

[0010] The 12-pulse DC back-to-back physical dynamic model device is used to: control the operation of all thyristor trigger monitoring units according to the control signal, and obtain the operation parameter data of all thyristor trigger monitoring units;

[0011] The control and protection system is used to: obtain and, based on the operation parameter data of the valve base electronic equipment and the operation parameter data of all thyristor trigger monitoring units, obtain the test result of the HVDC valve control system to be tested.

[0012] The beneficial effects of a full-closed-loop test platform for a high-voltage direct current valve control system of the present invention are as follows:

[0013] The working state of the valve base electronic equipment of the HVDC valve control system to be tested can be equivalently simulated by the HVDC thyristor-level equivalent simulation device, and by connecting multiple thyristor trigger monitoring units of the HVDC valve control system to be tested to the 12-pulse DC back-to-back physical dynamic model device, the valve base electronic equipment and all thyristor trigger monitoring units can be tested simultaneously, that is, a full-closed-loop test of the HVDC valve control system can be carried out, and the functions and reliability under the full engineering configuration of the software and hardware of the HVDC valve control system to be tested can be comprehensively tested, solving the problems that the existing test platform based on a digital simulation system cannot accurately simulate the transient and steady-state characteristics of the converter valve and the signal interface.

[0014] The technical solution of a full-closed-loop test method for a high-voltage direct current valve control system of the present invention is as follows:

[0015] The high-voltage DC transmission thyristor-level equivalent simulation device equivalently simulates the working state of the valve base electronic equipment of the to-be-tested high-voltage DC transmission valve control system, obtains the operation parameter data of the valve base electronic equipment, generates a control signal according to the operation parameter data of the valve base electronic equipment, and outputs the control signal to the 12-pulse DC back-to-back physical dynamic model device;

[0016] The 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the to-be-tested high-voltage DC transmission valve control system controls the operation of all thyristor trigger monitoring units according to the control signal, and obtains the operation parameter data of all thyristor trigger monitoring units;

[0017] The control and protection system obtains and, based on the operation parameter data of the valve base electronic equipment and the operation parameter data of all thyristor trigger monitoring units, obtains the test result of the to-be-tested high-voltage DC transmission valve control system.

[0018] The beneficial effects of a full-closed-loop test method for a high-voltage DC transmission valve control system of the present invention are as follows:

[0019] The high-voltage DC transmission thyristor-level equivalent simulation device can equivalently simulate the working state of the valve base electronic equipment of the to-be-tested high-voltage DC transmission valve control system, and connect multiple thyristor trigger monitoring units of the to-be-tested high-voltage DC transmission valve control system to the 12-pulse DC back-to-back physical dynamic model device, enabling simultaneous testing of the valve base electronic equipment and all thyristor trigger monitoring units, that is, enabling a full-closed-loop test of the high-voltage DC transmission valve control system, and being able to comprehensively test the functions and reliability under the full engineering configuration of the software and hardware of the to-be-tested high-voltage DC transmission valve control system, solving the problems that the existing test platform based on the digital simulation system cannot accurately simulate the transient and steady-state characteristics of the converter valve and the signal interface. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0021] Figure 1 It is a structural schematic diagram of a high-voltage DC transmission valve control system.

[0022] Figure 2 It is a schematic diagram of the principle of a test platform for a traditional high-voltage DC transmission valve control system.

[0023] Figure 3It is a schematic structural diagram of a full-closed-loop test platform for a high-voltage DC transmission valve control system according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic structural diagram of a 12-pulse DC back-to-back physical dynamic model device;

[0025] Figure 5 It is a schematic structural diagram of a physical model of a single 12-pulse converter valve;

[0026] Figure 6 It is a schematic structural diagram of a high-voltage DC transmission thyristor-level equivalent simulation device;

[0027] Figure 7 It is the voltage waveform at both ends of a single valve of the rectifier;

[0028] Figure 8 It is the current waveform of a single valve of the rectifier;

[0029] Figure 9 It is the voltage waveform at both ends of a single valve of the inverter;

[0030] Figure 10 It is the current waveform of a single valve of the inverter;

[0031] Figure 11 It is the principle of the hardware-in-the-loop test of the thyristor trigger monitoring unit.

[0032] Figure 12 It is a schematic flow diagram of a full-closed-loop test method for a high-voltage DC transmission valve control system according to an embodiment of the present invention; Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0034] As Figure 3 shown, a full-closed-loop test platform for a high-voltage DC transmission valve control system according to an embodiment of the present application includes: a control and protection system, a high-voltage DC transmission thyristor-level equivalent simulation device, and a 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the high-voltage DC transmission valve control system to be tested, which are connected to each other to form a closed loop;

[0035] Among them, the control and protection system can specifically be a processor, a server or a chip. The high-voltage direct current (HVDC) thyristor-level equivalent simulation device can adopt the HVDC thyristor-level equivalent simulation device in the patent application with the application number "201510724793.6" and the theme name "An HVDC Thyristor-Level Equivalent Simulation Device".

[0036] The HVDC thyristor-level equivalent simulation device is used for: equivalently simulating the working state of the valve base electronics of the to-be-tested HVDC valve control system, obtaining the operation parameter data of the valve base electronics, generating a control signal according to the operation parameter data of the valve base electronics, and outputting the control signal to the 12-pulse DC back-to-back physical dynamic model device;

[0037] The 12-pulse DC back-to-back physical dynamic model device is used for: controlling the operation of all thyristor trigger monitoring units according to the control signal, and obtaining the operation parameter data of all thyristor trigger monitoring units;

[0038] The control and protection system is used for: obtaining and based on the operation parameter data of the valve base electronics and the operation parameter data of all thyristor trigger monitoring units, obtaining the test result of the to-be-tested HVDC valve control system. Specifically:

[0039] The control and protection system obtains and based on the operation parameter data of the valve base electronics and the operation parameter data of all thyristor trigger monitoring units, and compares them with the pre-stored correct operation parameter data of the valve base electronics and the operation parameter data of all thyristor trigger monitoring units. If there is an inconsistent situation, the test result is that there is a problem with the to-be-tested HVDC valve control system, and the location where the problem occurs can be marked in detail, such as the specific location of the valve base electronics or the specific location of the thyristor trigger monitoring unit.

[0040] Preferably, in the above technical solution, the control and protection system is further used for: sending a first abnormal operation instruction to the HVDC thyristor-level equivalent simulation device;

[0041] The HVDC thyristor-level equivalent simulation device is further used for: generating a first abnormal operation control signal according to the first abnormal operation instruction, controlling the operation of the valve base electronics according to the first abnormal operation control signal, obtaining the abnormal operation parameter data of the valve base electronics, and sending it to the control and protection system;

[0042] The control and protection system is further used for: obtaining and based on the abnormal operation parameter data of the valve base electronics, obtaining the abnormal test result of the valve base electronics.

[0043] Specifically, some first abnormal operation instructions are used to detect whether the valve base electronic equipment can normally detect or process the abnormal operation control signals corresponding to these first abnormal operation instructions. By comparing with the pre-stored abnormal operation parameter data of the correct valve base electronic equipment (these parameter data are numerical data recording abnormalities), if they are inconsistent, the abnormal test result of the valve base electronic equipment is that the valve base electronic equipment cannot normally detect abnormal situations. If they are consistent, it indicates that the abnormal test result of the valve base electronic equipment is that the valve base electronic equipment can normally detect abnormal situations.

[0044] Among them, the first abnormal operation instructions can be set according to the actual situation. This instruction can be an instruction for controlling the conduction of thyristors or a protection action instruction, or a control instruction for communication parameters, etc.

[0045] Preferably, in the above technical solution, the control and protection system is further configured to: send a second abnormal operation instruction to the high-voltage DC transmission thyristor-level equivalent simulation device;

[0046] The high-voltage DC transmission thyristor-level equivalent simulation device is further configured to: generate a second abnormal operation control signal according to the second abnormal operation instruction, and send the second abnormal operation control signal to the 12-pulse DC back-to-back physical dynamic model device; the second abnormal operation instruction usually can also adopt a control instruction related to thyristor conduction.

[0047] The 12-pulse DC back-to-back physical dynamic model device is further configured to: control the operation of all thyristor trigger monitoring units according to the second abnormal operation control signal, obtain the abnormal operation parameter data of all thyristor trigger monitoring units, and send them to the control and protection system;

[0048] The control and protection system is further configured to: obtain and obtain the abnormal test results of all thyristor trigger monitoring units according to the abnormal operation parameter data of all thyristor trigger monitoring units.

[0049] Specifically, some second abnormal operation instructions are used to detect whether all thyristor trigger monitoring units can normally detect or process the abnormal operation control signals corresponding to these second abnormal operation instructions. By comparing with the pre-stored correct abnormal operation parameter data of all thyristor trigger monitoring units, if they are inconsistent, the abnormal test result of all thyristor trigger monitoring units is that all thyristor trigger monitoring units cannot normally detect abnormal situations. If they are consistent, it indicates that the abnormal test result of all thyristor trigger monitoring units is that all thyristor trigger monitoring units can normally detect abnormal situations.

[0050] Among them, the second abnormal operation instructions can be set according to the actual situation.

[0051] Preferably, in the above technical solution, it further includes a Supervisory Control and Data Acquisition (SCADA) system. The control and protection system performs data interaction with the high-voltage direct current (HVDC) thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device through the Supervisory Control and Data Acquisition (SCADA) system. Specifically:

[0052] 1) The control and protection system sends instructions through the Supervisory Control and Data Acquisition (SCADA) system to equivalently simulate the working state of the valve base electronics of the to-be-tested HVDC valve control system; the working state usually includes normal state, abnormal state, fault state, etc.

[0053] 2) The control and protection system obtains the operation parameter data of the valve base electronics and the operation parameter data of all thyristor trigger monitoring units through the Supervisory Control and Data Acquisition (SCADA) system. The parameter data can usually be triggered by an instruction of "thyristor-level overvoltage protection action";

[0054] 3) The control and protection system sends the first abnormal operation instruction to the HVDC thyristor-level equivalent simulation device through the Supervisory Control and Data Acquisition (SCADA) system;

[0055] 4) The control and protection system collects the abnormal operation parameter data of the valve base electronics, such as the numerical data of relevant abnormal operations, through the Supervisory Control and Data Acquisition (SCADA) system and sends it to the control and protection system;

[0056] 5) The control and protection system sends the second abnormal operation instruction to the HVDC thyristor-level equivalent simulation device through the Supervisory Control and Data Acquisition (SCADA) system;

[0057] 6) The control and protection system collects the abnormal operation parameter data of all thyristor trigger monitoring units through the Supervisory Control and Data Acquisition (SCADA) system and sends it to the control and protection system.

[0058] Among them, the control and protection system obtains the specific structure data of the valve base electronics of the to-be-tested HVDC valve control system through the PROFIBUS fieldbus standard of automation technology, and sends the specific structure data to the HVDC thyristor-level equivalent simulation device through the Supervisory Control and Data Acquisition (SCADA) system, so that the HVDC thyristor-level equivalent simulation device can equivalently simulate the working state of the valve base electronics of the to-be-tested HVDC valve control system.

[0059] Among them, the control and protection system specifically obtains the specific structure data of the valve base electronics of the to-be-tested HVDC valve control system through multiplexed control optical signals.

[0060] Figure 3The telemetry data is: the operation parameter data of all thyristor trigger monitoring units and the abnormal operation parameter data of all thyristor trigger monitoring units. The telecontrol data can be: the control and protection system can also directly send commands to the 12-pulse DC back-to-back physical dynamic model device to obtain the operation parameter data of all thyristor trigger monitoring units and the abnormal operation parameter data of all thyristor trigger monitoring units.

[0061] Preferably, in the above technical solution, the control and protection system is used to: add the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units to the test results of the high-voltage DC transmission valve control system to be tested.

[0062] As Figure 3 shown, a full-closed-loop test platform for a high-voltage DC transmission valve control system of the present application includes a 12-pulse DC back-to-back physical dynamic model device, a single-valve thyristor stage equivalent device, i.e., a high-voltage DC transmission thyristor stage equivalent simulation device, and a control and protection system. Among them, the control and protection system includes a DC control and protection system and a background monitoring system SCADA, i.e., a data acquisition and monitoring control system SCADA. The test objects are the VBE and multiple TTMs of the high-voltage DC transmission valve control system. These test equipment and test objects are organically combined to simulate the basic operating conditions of an actual DC transmission project, enabling the test objects to operate under operating conditions equivalent to those of the actual project, and comprehensively verifying their various functions and performances.

[0063] As the control and monitoring system of this test platform, the control and protection system realizes functions such as starting, stopping, and simulating various working conditions of the test platform, and is the brain of the entire test platform. The control and protection system can monitor and control the switching equipment in the 12-pulse DC back-to-back physical dynamic model device through telemetry and telecontrol data, and at the same time control and monitor the DC converter valves in the 12-pulse DC back-to-back physical dynamic model device through the VBE and TTM.

[0064] The 12-pulse DC back-to-back physical dynamic model device simulates the operating conditions of an actual DC transmission project, including steady-state and transient conditions. It is also the actual controlled object of the test objects VBE and TTM, so it can make the controlled object operate under the same conditions as the actual project, achieving the purpose of verifying all functions and performances of the controlled object.

[0065] The test objects VBE and TTM, as the interface equipment between the control and protection system and the 12-pulse DC back-to-back physical dynamic model device, assist the control and protection system in realizing the DC converter valve equipment in the 12-pulse DC back-to-back physical dynamic model device.

[0066] The single - valve thyristor equivalent device, i.e., the high - voltage direct - current (HVDC) thyristor - level equivalent simulation device, serves as the interface device between the test object VBE and the test object TTM. It configures the interface signals between the two according to the number of interface signals in the actual project, making the two test objects equivalent to the actual operating conditions and improving the test integrity.

[0067] Among them, the 12 - pulse DC back - to - back physical dynamic model device consists of two 12 - pulse converter valve physical models and adopts a ring topology, as Figure 4 shown. When the single converter valve in the 12 - pulse converter valve physical model is actually used in the project, it is composed of 60 to 80 thyristors in series and is simulated by a single thyristor level, as Figure 5 shown. On the premise of ensuring equivalent electrical characteristics, it meets the cost and safety requirements. And the electrical circuit of each thyristor level is the same as that of the actual project, including thyristors, DC voltage - sharing resistors, damping resistors, and damping capacitors, etc. Its electrical and control characteristics are equivalent to those of the actual project, and it can be compatible with the thyristor trigger monitoring unit of the test object to realize the hardware - in - the - loop test of the thyristor trigger monitoring unit. Specifically:

[0068] As Figure 4 shown, in addition to the two 12 - pulse converter valve physical models, in order to equivalently simulate the complete operating characteristics of the DC transmission project, it also includes converter transformers, voltage regulators, disconnectors, circuit breakers, and related measuring devices. And in order to realize flexible configuration of test items, disconnectors (Q31 and Q32) and resistive loads are configured between the two converter valve models.

[0069] This 12 - pulse DC back - to - back physical dynamic model device includes two operation and test modes:

[0070] 1) Double 12 - pulse converter valve HVDC operation mode: Q31 is closed, Q32 is open, Q11 is closed, Q12 is closed, Q21 is closed, Q22 is closed;

[0071] 2) Single 12 - pulse converter valve rectification operation mode: Q32 is closed, Q31 is open, Q11 is closed (or open), Q12 is closed (or open), Q21 is open (or closed), Q22 is open (or closed).

[0072] The 12 - pulse DC back - to - back physical dynamic model device is equivalent to the electrical characteristics of the actual project's high - voltage direct - current transmission system, simulates the actual operating conditions of the thyristor trigger monitoring unit TTM and the valve - base electronics device VBE of the test object, and realizes the hardware - in - the - loop test of the thyristor trigger monitoring unit TTM and the valve - base electronics device VBE under the full - project configuration.

[0073] Among them, the high - voltage direct - current thyristor - level equivalent simulation device is used to simulate the operating states of any one level, multiple levels, or all thyristor levels in a single valve. The structure is specifically as Figure 6As shown, the high-voltage DC transmission thyristor-level equivalent simulation device receives the communication signal of a single thyristor-level, replicates this signal within the device, and achieves the same number of signals as in the actual project. It mainly consists of an optical signal receiver, an optical signal transmitter, an optical signal replication and distribution module, and an optical signal merging module. For the specific working process, refer to the high-voltage DC transmission thyristor-level equivalent simulation device in the patent application with the application number "201510724793.6" and the subject name "A High-voltage DC Transmission Thyristor-level Equivalent Simulation Device", which will not be elaborated here.

[0074] Among them, the DC control and protection system mainly consists of a main control chassis, an analog quantity acquisition chassis, and a digital input / output chassis, which is used to simulate the DC control and protection system of the actual project, connect with the valve base electronic equipment of the test object, and achieve the simulation of the control and monitoring functions of the valve base electronic equipment, enabling the valve base electronic equipment to be tested in the full-project configuration and improving the test equivalence. The main control chassis realizes functions such as control and protection strategies and communication with the valve base electronic equipment. The analog quantity acquisition chassis realizes the function of collecting the operating electrical quantities of the 12-pulse physical model. The digital input / output chassis realizes the control and monitoring functions of the circuit breakers and disconnectors of the physical model. The working process of the DC control and protection system is well-known to those skilled in the art and will not be elaborated here.

[0075] Among them, the background monitoring system is an integral converter valve operation monitoring system with high visualization and convenient operation. The specific data for monitoring are: the operating status of the thyristor trigger monitoring unit of the test object, the operating status of the valve base electronic equipment of the test object, the 12-pulse DC back-to-back physical dynamic model device, the simulation of converter valve faults, the control of test start and stop, the emergency shutdown control of the test platform, etc.

[0076] The startup process of a full-closed-loop test platform for a high-voltage DC transmission valve control system of this application is as follows:

[0077] The startup of the test platform adopts the method of simulating the startup of a back-to-back DC transmission project. First, adjust the voltage regulators on both the rectifier and inverter sides (such as Figure 2 ) to the lowest gear (the lowest voltage gear of the transformer valve side voltage), then open switch Q32 and close Q31. After that, first close the rectifier side switches Q11, Q12 and the inverter side switches Q21, Q22, observe whether the output voltage of the voltage regulator is the lowest, then close Q13, Q14 and Q23, Q24 to charge the converter transformers on both sides, and observe whether the output voltage of the converter transformers conforms to the turns ratio after the charging is completed. Then adjust the voltage regulators on both sides to the system rated voltage (for example, 400VDC). At this time, all converter valves are blocked, and all 24 TTM boards in the system are in the power-taking state. After the TTM power-taking is complete, all TTMs establish communication with the VBE. At this time, it can be observed through the background whether the RFO signal of the VBE is normal. If it is normal, it indicates that the system already has the unlocking condition.

[0078] The unlocking command of the rectifier side is remotely issued from the SCADA background. At this time, the operator observes whether the rated voltage of the DC bus is stably established. After confirmation, the unlocking command of the inverter side can be issued. After the rectifier and inverter sides are normally unlocked, it can be confirmed from the profibus message uploaded by the VBE that all thyristor levels are operating without faults. At this time, the test platform has the test conditions to support various test items of the VBE, and the test can be carried out. The following uses two test examples to illustrate the test items. Specifically:

[0079] 1) Overvoltage protection test of the thyristor level of the VBE: The specific method is to use the background SCADA to remotely control the equivalent equipment of the single-valve thyristor level, specify a certain valve, such as valve 3. The communication code reported by the xth path (or any multiple paths, etc., and so on) of the thyristor level to the VBE during the test is "thyristor level overvoltage protection action". Then the operator can observe the profibus message output by the VBE during the test process to determine whether the VBE function is normal. When the number of thyristor levels reporting "thyristor level overvoltage protection action" monitored by the VBE exceeds the redundancy setting of the VBE system, the VBE reports "valve x thyristor level overvoltage protection action exceeds redundancy".

[0080] 2) Fault monitoring test of the thyristor level of the VBE: The principle of this test is designed according to the characteristics of the LCC type converter valve. The trigger monitoring board (TTM) of the thyristor level needs to obtain energy from the thyristor level to work. When the thyristor on the thyristor level breaks down, the thyristor level is equivalent to a short circuit, and then the TTM cannot obtain energy. At this time, the optical fiber communication emitted by the TTM to the VBE will have no light. At this time, the VBE cannot detect the optical signal from the TTM. After several power frequency cycles like this, the VBE will consider that the thyristor level is damaged and perform corresponding relevant actions.

[0081] According to the above principle, the specific method of this test is to use the background SCADA to remotely control the equivalent equipment of the single-valve thyristor level, specify a certain valve, such as valve 3 (attached Figure 2 or Figure 4 Y2 valve in it), where the xth path (or any multiple paths, etc., and so on) of the thyristor level interrupts the communication optical signal reported to the VBE during the test, inducing the VBE to consider that the thyristor level is damaged. The operator can observe the profibus message output by the VBE during the test process to determine whether the VBE function is normal. When the number of thyristor levels reporting "thyristor level fault" monitored by the VBE exceeds the redundancy setting of the VBE system, the VBE reports "valve x thyristor level fault exceeds redundancy".

[0082] In another embodiment, it includes: a 12-pulse DC back-to-back physical dynamic model device, a high-voltage DC transmission thyristor level equivalent simulation device, a DC control and protection system, and a background monitoring system; specifically:

[0083] 1) 12 - pulse DC back - to - back physical dynamic model device:

[0084] A 12 - pulse DC back - to - back physical dynamic model device is designed. Innovatively, a low - voltage physical model is used to equivalently simulate the electrical characteristics of the high - voltage DC transmission system in actual projects. The 12 - pulse DC back - to - back physical model consists of two 12 - pulse converters with a single thyristor simulating two valves in a converter valve, 2 transformers, 2 voltage regulators, and multiple circuit breakers and disconnectors. Among them, the converter valve is simulated by a single thyristor stage, and it is compatible with the actual thyristor trigger monitoring unit, realizing the hardware - in - the - loop test of the thyristor trigger monitoring unit for the first time. This model adopts a ring - shaped electrical topology, enabling the rectifier side and the inverter side of the back - to - back DC transmission system to use the same AC bus, forming a circulating current for the active power required by the test platform, reducing the active power dependence on the laboratory power supply, and improving the operation safety of the test platform.

[0085] 2) High - voltage DC transmission thyristor - stage equivalent simulation equipment:

[0086] A single - valve thyristor - stage equivalent equipment is developed, which can flexibly simulate the operating states of any one, multiple, or all thyristor stages in a single valve by the operating state of a single - stage thyristor, overcoming the defects that the pure digital simulation system cannot simulate the true physical transient and steady - state characteristics of the converter valve thyristor stage and the incomplete signals, and can achieve full equivalence of the VBE interface and working conditions with actual projects.

[0087] 3) Background monitoring system:

[0088] A highly visual and easy - to - operate integrated converter valve operation monitoring system is developed, which can intuitively reflect the operating conditions of each thyristor stage in the converter valve, real - time monitor the operating state of the measured valve control system and test results, and has characteristics such as perfect functions, powerful performance, fast data response speed, and strong information processing ability.

[0089] 4) Full - condition dynamic simulation test method:

[0090] A full - condition dynamic simulation test method for the valve control system is proposed. Using real DC control protection and background monitoring as the upper - layer control system, it can realize real - time monitoring of thousands of thyristors in the valve control system under full - engineering configuration and comprehensive assessment of the converter valve control protection strategy in the laboratory environment, achieving full equivalence of functions and interfaces among the valve control system, DC control protection system, background monitoring system, and converter valve, fully verifying various functions and reliability of the valve control system, and obtaining the optimal test evaluation conclusion.

[0091] In the embodiment of the present invention, a brand - new 12 - pulse DC back - to - back physical dynamic model device is designed, as Figure 4As shown, it can cooperate with the VBE, TTM, and control and protection systems to complete relevant valve control tests. The back-to-back DC system is based on the transient and steady-state characteristics of the DC transmission system required for the full-closed-loop test of the equivalent valve control system of the low-voltage physical model. It can operate either as a complete DC system or in the form of a single rectifier with a load. The system parameters are shown in Table 1 below, and the voltage and current waveforms of the converter valve are as Figure 7 , 8 , 9, and 10 shown.

[0092] Table 1:

[0093] Serial number Parameter name Symbol Value Unit 1 DC voltage on the rectifier side Udr 420 V 2 DC voltage on the inverter side Udi 380 V 3 DC current Id 40 A 4 Trigger angle on the rectifier side α 15 Power frequency electrical angle 5 Turn-off angle on the inverter side γ 17 Power frequency electrical angle 6 Leakage reactance of converter transformer X 0.18 pu 7 Number of 6-pulse series connections N 2 pcs 8 Line load resistance R 1 Ω 9 No-load line voltage of converter transformer on the rectifier side Ur 166 V 10 No-load line voltage of converter transformer on the inverter side Ui 152 V 11 Capacity of converter transformer on the rectifier side Sr 9400 VA 12 Capacity of converter transformer on the inverter side Si 8619 VA

[0094] The 12-pulse DC back-to-back physical dynamic model device consists of multiple physical objects, including: 2 12-pulse converter valves with a single thyristor forming a single valve, 4 on-load tap-changing transformers, 2 voltage regulators, multiple circuit breakers and disconnectors, a busbar, and multiple voltage and current measuring devices. This physical model adopts a unique ring-shaped electrical topology, enabling the rectifier side and the inverter side of the back-to-back DC transmission system to use the same electrical busbar, and this busbar is connected to the power supply of the laboratory. The advantage of this electrical topology is that it enables active power to form commutation in the ring-shaped electrical loop, reducing the active power dependence on the laboratory power supply and the impact on the laboratory power supply.

[0095] A single converter valve in the 12-pulse DC back-to-back physical dynamic model device consists of a single thyristor, and at the same time, a thyristor damping and voltage equalizing circuit with the same parameters as those on the engineering site is configured, resulting in full compatibility with the interface function of the thyristor trigger monitoring unit for engineering use and enabling the hardware-in-the-loop test of the thyristor trigger monitoring unit of the test object, as Figure 11 shown.

[0096] In the embodiment of the present invention, a high-voltage DC transmission thyristor-level equivalent simulation device is developed, which can flexibly simulate the operating states of any one, multiple, or all thyristor levels in a single valve by the operating state of a single thyristor level, overcoming the defects of the pure digital simulation system that cannot simulate the true physical transient and steady-state characteristics of the converter valve thyristor level and the incomplete signals, and realizing that the VBE interface and working conditions of the test object are completely equivalent to those of the actual project.

[0097] In the embodiment of the present invention, a set of converter valve operation monitoring data processing platform is developed, which can intuitively reflect the operating conditions of each thyristor level in the converter valve, real-time monitor the operating state and test results of the measured valve control system, and can meet the requirements of the operator to retrieve, monitor, and operate the operating states of each thyristor level of the converter valve and the measured valve control system at any time.

[0098] In an embodiment of the present invention, a full-condition dynamic simulation test method for a valve control system is proposed. By using real DC control protection and background monitoring as the upper control system, it can realize real-time monitoring of thousands of thyristors in the valve control system under full engineering configuration and comprehensive assessment of the control and protection strategies of the converter valve in a laboratory environment. It realizes the full equivalence of functions and interfaces among the valve control system, the DC control protection system, the background monitoring system, and the converter valve, fully verifies various functions and reliability of the high-voltage DC transmission valve control system, and reaches the optimal test evaluation conclusion.

[0099] A high-voltage DC transmission thyristor-level equivalent simulation device of the present application includes a 12-pulse DC back-to-back physical dynamic model device, a high-voltage DC transmission thyristor-level equivalent simulation device, a DC control protection system, a background monitoring system, and a valve control system under test (VBE and TTM), etc. Through this test platform, for the first time, the functions and reliability of the valve control system under full engineering configuration of software and hardware are comprehensively tested, solving the defect that the traditional test platform based on the digital simulation system cannot simulate the massive signal interfaces and operating conditions of the valve control system, resulting in the inability to implement the hardware-in-the-loop test under the full engineering configuration of the valve control system, and further improving the reliability of the high-voltage DC converter valve control system and even the DC transmission project. In view of the characteristics of the valve control system test platform, such as complex structure, testing method, interface configuration, and large communication data volume, the present invention proposes a test method for the functions and reliability of the high-voltage DC converter valve control system, completes the design of the test platform, and breaks through technical difficulties such as research on test interfaces and functional equivalence and development of key equipment.

[0100] As Figure 12 shown, a full-closed-loop test method for a high-voltage DC transmission valve control system according to an embodiment of the present invention includes:

[0101] S1. The high-voltage DC transmission thyristor-level equivalent simulation device equivalently simulates the working state of the valve base electronics of the high-voltage DC transmission valve control system under test, obtains the operation parameter data of the valve base electronics, generates a control signal according to the operation parameter data of the valve base electronics, and outputs the control signal to the 12-pulse DC back-to-back physical dynamic model device;

[0102] S2. The 12-pulse DC back-to-back physical dynamic model device connected to multiple thyristor trigger monitoring units of the high-voltage DC transmission valve control system under test controls the operation of all thyristor trigger monitoring units according to the control signal, and obtains the operation parameter data of all thyristor trigger monitoring units;

[0103] S3. The control protection system obtains and obtains the test result of the high-voltage DC transmission valve control system under test according to the operation parameter data of the valve base electronics and the operation parameter data of all thyristor trigger monitoring units.

[0104] Preferably, in the above technical solution, it further includes:

[0105] S10. The control and protection system sends a first abnormal operation instruction to the HVDC thyristor-level equivalent simulation device;

[0106] S11. The HVDC thyristor-level equivalent simulation device generates a first abnormal operation control signal according to the first abnormal operation instruction, and controls the operation of the valve base electronic equipment according to the first abnormal operation control signal to obtain the abnormal operation parameter data of the valve base electronic equipment, and sends it to the control and protection system;

[0107] S12. The control and protection system also acquires and obtains the abnormal test result of the valve base electronic equipment according to the abnormal operation parameter data of the valve base electronic equipment.

[0108] Preferably, in the above technical solution, it further includes:

[0109] S20. The control and protection system sends a second abnormal operation instruction to the HVDC thyristor-level equivalent simulation device;

[0110] S21. The HVDC thyristor-level equivalent simulation device generates a second abnormal operation control signal according to the second abnormal operation instruction, and sends the second abnormal operation control signal to the 12-pulse DC back-to-back physical dynamic model device;

[0111] S22. The 12-pulse DC back-to-back physical dynamic model device controls the operation of all thyristor trigger monitoring units according to the second abnormal operation control signal to obtain the abnormal operation parameter data of all thyristor trigger monitoring units, and sends it to the control and protection system;

[0112] S23. The control and protection system acquires and obtains the abnormal test result of all thyristor trigger monitoring units according to the abnormal operation parameter data of all thyristor trigger monitoring units.

[0113] Preferably, in the above technical solution, the process of the control and protection system performing data interaction with the HVDC thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device includes:

[0114] The control and protection system performs data interaction with the HVDC thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device through the data acquisition and monitoring control system.

[0115] Preferably, in the above technical solution, it further includes:

[0116] S4. The control and protection system adds the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units to the test results of the high-voltage DC transmission valve control system to be tested.

[0117] In the above embodiments, although the steps are numbered as S1, S2, etc., these are only specific embodiments given in this application. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, and this is also within the protection scope of the present invention. It can be understood that in some embodiments, it may include some or all of the above embodiments.

[0118] In the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0119] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0120] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A full-closed-loop test platform for a high-voltage direct current transmission valve control system, characterized in that, Including: A control and protection system, a high-voltage direct current (HVDC) thyristor-level equivalent simulation device, and a 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the to-be-tested HVDC valve control system are interconnected to form a closed loop. The 12-pulse DC back-to-back physical dynamic model device consists of two 12-pulse converter valve physical models and adopts a ring topology. An isolator switch and a resistive load are configured between the two 12-pulse converter valve physical models. The HVDC thyristor-level equivalent simulation device is used for: equivalently simulating the operating state of the valve base electronics of the to-be-tested HVDC valve control system, obtaining the operating parameter data of the valve base electronics, generating a control signal according to the operating parameter data of the valve base electronics, and outputting the control signal to the 12-pulse DC back-to-back physical dynamic model device. The 12-pulse DC back-to-back physical dynamic model device is used for: controlling the operation of all thyristor trigger monitoring units according to the control signal and obtaining the operating parameter data of all thyristor trigger monitoring units. The control and protection system is used for: acquiring and obtaining the test result of the to-be-tested HVDC valve control system according to the operating parameter data of the valve base electronics and the operating parameter data of all thyristor trigger monitoring units.

2. The full-closed-loop test platform for a high-voltage DC transmission valve control system according to claim 1, characterized in that, The control and protection system is further used for: sending a first abnormal operation instruction to the HVDC thyristor-level equivalent simulation device. The HVDC thyristor-level equivalent simulation device is further used for: generating a first abnormal operation control signal according to the first abnormal operation instruction, controlling the operation of the valve base electronics according to the first abnormal operation control signal, obtaining the abnormal operating parameter data of the valve base electronics, and sending it to the control and protection system. The control and protection system is further used for: acquiring and obtaining the abnormal test result of the valve base electronics according to the abnormal operating parameter data of the valve base electronics.

3. The full-closed-loop test platform for a high-voltage DC transmission valve control system according to claim 2, wherein The control and protection system is further used for: sending a second abnormal operation instruction to the HVDC thyristor-level equivalent simulation device. The HVDC thyristor-level equivalent simulation device is further used for: generating a second abnormal operation control signal according to the second abnormal operation instruction and sending the second abnormal operation control signal to the 12-pulse DC back-to-back physical dynamic model device. The 12-pulse DC back-to-back physical dynamic model device is further used for: controlling the operation of all thyristor trigger monitoring units according to the second abnormal operation control signal, obtaining the abnormal operating parameter data of all thyristor trigger monitoring units, and sending it to the control and protection system. The control and protection system is further used for: acquiring and obtaining the abnormal test result of all thyristor trigger monitoring units according to the abnormal operating parameter data of all thyristor trigger monitoring units.

4. A full-closed-loop test platform for a high-voltage DC transmission valve control system according to any one of claims 1 to 3, characterized in that, It further includes a data acquisition and monitoring control system. The control and protection system performs data interaction with the HVDC thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device through the data acquisition and monitoring control system.

5. The full-closed-loop test platform for a high-voltage DC transmission valve control system according to claim 3, characterized in that, The control and protection system is used for: adding the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units to the test results of the high-voltage DC transmission valve control system to be tested.

6. A full-closed-loop test method for a high-voltage direct current transmission valve control system, characterized in that, It includes: The following devices that are interconnected to form a closed loop; The high-voltage DC transmission thyristor-level equivalent simulation device equivalently simulates the working state of the valve base electronic equipment of the high-voltage DC transmission valve control system to be tested, obtains the operation parameter data of the valve base electronic equipment, generates a control signal according to the operation parameter data of the valve base electronic equipment, and outputs the control signal to the 12-pulse DC back-to-back physical dynamic model device; The 12-pulse DC back-to-back physical dynamic model device consists of two 12-pulse converter valve physical models and adopts a ring topology. A disconnector and a resistive load are configured between the two 12-pulse converter valve physical models; The 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the high-voltage DC transmission valve control system to be tested controls the operation of all thyristor trigger monitoring units according to the control signal and obtains the operation parameter data of all thyristor trigger monitoring units; The control and protection system obtains and obtains the test results of the high-voltage DC transmission valve control system to be tested according to the operation parameter data of the valve base electronic equipment and the operation parameter data of all thyristor trigger monitoring units.

7. A full-closed-loop test method for a high-voltage DC transmission valve control system according to claim 6, characterized in that, It also includes: The control and protection system sends a first abnormal operation instruction to the high-voltage DC transmission thyristor-level equivalent simulation device; The high-voltage DC transmission thyristor-level equivalent simulation device generates a first abnormal operation control signal according to the first abnormal operation instruction, controls the operation of the valve base electronic equipment according to the first abnormal operation control signal, obtains the abnormal operation parameter data of the valve base electronic equipment, and sends it to the control and protection system; The control and protection system also obtains and obtains the abnormal test results of the valve base electronic equipment according to the abnormal operation parameter data of the valve base electronic equipment.

8. A full-closed-loop test method for a high-voltage DC transmission valve control system according to claim 7, characterized in that, It also includes: The control and protection system sends a second abnormal operation instruction to the high-voltage DC transmission thyristor-level equivalent simulation device; The high-voltage DC transmission thyristor-level equivalent simulation device generates a second abnormal operation control signal according to the second abnormal operation instruction and sends the second abnormal operation control signal to the 12-pulse DC back-to-back physical dynamic model device; The 12-pulse DC back-to-back physical dynamic model device controls the operation of all thyristor trigger monitoring units according to the second abnormal operation control signal, obtains the abnormal operation parameter data of all thyristor trigger monitoring units, and sends it to the control and protection system; The control and protection system obtains and obtains the abnormal test results of all thyristor trigger monitoring units according to the abnormal operation parameter data of all thyristor trigger monitoring units.

9. A full-closed-loop test method for a high-voltage DC transmission valve control system according to any one of claims 6 to 8, characterized in that, The process of data interaction between the control and protection system and the high-voltage DC transmission thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device includes: The control and protection system performs data interaction with the high-voltage direct current (HVDC) thyristor-level equivalent simulation device and the 12-pulse DC back-to-back physical dynamic model device through the data acquisition and monitoring control system.

10. A full-closed-loop test method for a high-voltage direct current transmission valve control system according to claim 8, characterized in that It further includes: The control and protection system adds the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units to the test results of the to-be-tested HVDC valve control system.

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