CN114647227A - Full closed loop test platform and method for high-voltage direct-current transmission valve control system - Google Patents

Abstract

The invention relates to the technical field of power automation, in particular to a full closed-loop test platform and a full closed-loop test method for a high-voltage direct-current transmission valve control system. The test platform includes: the 12-pulse direct-current back-to-back physical dynamic model device is used for connecting a plurality of thyristor trigger monitoring units of the high-voltage direct-current transmission valve control system to be tested, can perform full closed-loop test on the high-voltage direct-current transmission valve control system, and can realize comprehensive test on the function and reliability of the high-voltage direct-current transmission valve control system to be tested under the full-engineering configuration of software and hardware. The system can realize the test under various conditions, and solves the problem of single test scene in the prior art.

Description

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

technical field

The invention relates to the technical field of electric power automation, in particular to a fully closed-loop test platform and method for a high-voltage direct current transmission valve control system.

Background technique

The valve control system is the "brain" of the DC transmission 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 realize 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.

The HVDC valve control system mainly includes multiple thyristor trigger monitoring units (TTM) and valve base electronic equipment (VBE), which is the core equipment for HVDC valve control system control, as shown in Figure 1. Among them, the thyristor trigger monitoring unit (TTM) is the bottom control and protection unit of the converter valve, which mainly completes the triggering, monitoring and protection functions of the thyristor. The valve base electronic equipment (VBE) is the link between the upper layer control and protection system and the bottom layer thyristor trigger monitoring unit The intermediate link is used to receive the control commands of the upper-level control and protection system, and realize the synchronous triggering of the multi-level thyristor and the information exchange of the multi-information state. As mentioned above, the HVDC valve control system not only has complex functions, but also has a large number of signal interfaces and complex logic. The development of its interfaces and functional equivalence is its difficulty.

At present, the valve control system functions and reliability verification methods commonly used by domestic valve control system manufacturers are shown in Figure 2. specifically:

The HVDC valve control system is tested by the discrete test method, that is, the VBE uses a digital simulation platform to verify its function and the interface with the DC control and protection system, but it lacks the TTM link and is not a complete valve control system closed-loop test platform. The interface function between the valve base electronic equipment (VBE) and the thyristor trigger monitoring unit (TTM) is completed through an independent test platform, and it is an open-loop test system, which cannot complete various working conditions and interface characteristics of the equivalent valve control system . In addition, limited by the test capacity of the test platform, the current test method uses digital simulation equipment to simulate the converter valve, which can only realize the functional test under the simplified configuration of the valve control system. It is a simplified version, and there are defects such as inability to realize the test under the software and hardware configuration of valve control system engineering and incomplete simulation of working conditions. That is to say, the valve control system engineering of the existing test platform has low equivalence and cannot fully simulate the software, hardware and interface logic of the valve control system.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a fully closed-loop test platform and method for the valve control system of high-voltage direct current power transmission in view of the deficiencies of the prior art.

The technical scheme of a fully closed-loop test platform for a high-voltage direct current transmission valve control system of the present invention is as follows:

Including: control and protection system, HVDC thyristor-level equivalent simulation equipment, and a 12-pulse DC back-to-back physical dynamic model device used to connect multiple thyristor trigger monitoring units of the HVDC valve control system to be tested;

The HVDC thyristor-level equivalent simulation device is used for: equivalently simulating the working state of the valve-based electronic device of the HVDC valve control system to be tested, obtaining the operating parameter data of the valve-based electronic device, and according to the The operating parameter data of the valve base electronic equipment generates a control signal, 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 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;

The control and protection system is used to obtain and obtain the test result of the valve control system of the HVDC power transmission 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.

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

Through the HVDC thyristor-level equivalent simulation equipment, the working state of the valve-based electronic equipment of the HVDC valve control system to be tested can be simulated equivalently, and the multiple thyristors of the HVDC valve control system to be tested can be triggered by the monitoring unit. Connected to the 12-pulse DC back-to-back physical dynamic model device, it can test the valve-based electronic equipment and all thyristor trigger monitoring units at the same time, that is, it can perform a full closed-loop test of the HVDC valve control system, and can realize the HVDC transmission to be tested. The function and reliability of the valve control system under the fully-engineered configuration of hardware and software are fully tested to solve the problem that the existing test platform based on the digital simulation system cannot accurately simulate the transient steady state characteristics and signal interface of the converter valve.

The technical scheme of a fully closed-loop test method for a high-voltage direct current transmission valve control system of the present invention is as follows:

The HVDC thyristor-level equivalent simulation equipment equivalently simulates the working state of the valve-based electronic equipment of the HVDC valve control system to be tested, obtains the operating parameter data of the valve-based electronic equipment, and according to the valve-based electronic equipment The operating parameter data generates a control signal, and outputs the control signal to the 12-pulse DC back-to-back physical dynamic model device;

A 12-pulse DC back-to-back physical dynamic model device for connecting multiple thyristor trigger monitoring units of the HVDC transmission valve control system to be tested, controls the operation of all thyristor trigger monitoring units according to the control signal, and obtains all thyristor trigger monitoring units. Operating parameter data;

The control and protection system obtains and obtains the test result of the valve control system of the HVDC transmission to be tested according to the operation parameter data of the valve base electronic equipment and the operation parameter data of all the thyristor trigger monitoring units.

The beneficial effects of the fully closed-loop test method for a HVDC power transmission valve control system of the present invention are as follows:

Through the HVDC thyristor-level equivalent simulation equipment, the working state of the valve-based electronic equipment of the HVDC valve control system to be tested can be simulated equivalently, and the multiple thyristors of the HVDC valve control system to be tested can be triggered by the monitoring unit. Connected to the 12-pulse DC back-to-back physical dynamic model device, it can test the valve-based electronic equipment and all thyristor trigger monitoring units at the same time, that is, it can perform a full closed-loop test of the HVDC valve control system, and can realize the HVDC transmission to be tested. The function and reliability of the valve control system under the fully-engineered configuration of hardware and software are fully tested to solve the problem that the existing test platform based on the digital simulation system cannot accurately simulate the transient steady state characteristics and signal interface of the converter valve.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings that are used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

FIG. 1 is a schematic structural diagram of a valve control system for HVDC transmission.

Figure 2 is a schematic diagram of the test platform of the traditional HVDC valve control system.

3 is a schematic structural diagram of a fully closed-loop test platform for a valve control system for HVDC power transmission according to an embodiment of the present invention;

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

FIG. 5 is a schematic structural diagram of a physical model of a single 12-pulse converter valve;

FIG. 6 is a schematic structural diagram of a thyristor-level equivalent analog device for HVDC power transmission;

Figure 7 is the voltage waveform across the single valve of the rectifier;

Figure 8 is the current waveform of the rectifier single valve;

Figure 9 is the voltage waveform across the inverter single valve;

Figure 10 is the current waveform of the inverter single valve;

Figure 11 shows the hardware-in-the-loop test principle of the thyristor trigger monitoring unit.

12 is a schematic flowchart of a fully closed-loop test method for a HVDC valve control system according to an embodiment of the present invention;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 3 , a fully closed-loop test platform for a HVDC transmission valve control system according to an embodiment of the present application includes: a control and protection system, a HVDC thyristor-level equivalent simulation device, and a HVDC transmission valve for connecting to be tested. Multiple thyristors of the control system trigger the 12-pulse DC back-to-back physical dynamic model device of the monitoring unit, which are connected to each other to form a closed loop;

Among them, the control and protection system can be specifically a processor, a server or a chip, and the equivalent analog equipment of the high-voltage DC transmission thyristor level can be used in the application number "201510724793.6" and the subject name is "A high-voltage DC transmission thyristor-level equivalent analog equipment". The HVDC thyristor-level equivalent analog device.

The HVDC thyristor-level equivalent simulation device is used for: equivalently simulating the working state of the valve-based electronic device of the HVDC valve control system to be tested, obtaining the operating parameter data of the valve-based electronic device, and according to the The operating parameter data of the valve base electronic equipment generates a control signal, 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 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;

The control and protection system is used to obtain and obtain the test result of the valve control system of the HVDC power transmission 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. specifically:

The control and protection system obtains and triggers the operation parameter data of all thyristor monitoring units according to the operating parameter data of the valve base electronic equipment, and stores the correct operating parameter data of the valve base electronic equipment and all thyristors to trigger the operation of the monitoring unit. Compare the parameter data. If there is any inconsistency, the test result is that there is a problem with the HVDC transmission valve control system to be tested, and the location of the problem can be marked in detail, such as the specific location of the valve base electronic equipment or the thyristor triggering monitoring unit specific location.

Preferably, in the above technical solution, the control and protection system is further configured to: send a first abnormal operation command to the HVDC thyristor-level equivalent analog device;

The HVDC thyristor-level equivalent simulation device is further configured to: generate a first abnormal operation control signal according to the first abnormal operation instruction, and control the operation of the valve-based electronic device according to the first abnormal operation control signal , obtain the abnormal operation parameter data of the valve base electronic equipment, and send it to the control and protection system;

The control and protection system is further configured to: acquire and obtain abnormal test results of the valve-based electronic device according to abnormal operation parameter data of the valve-based electronic device.

Specifically, some first abnormal operation instructions are used to detect that the valve base electronic equipment can normally find or process the abnormal operation control signals corresponding to these first abnormal operation instructions, and the abnormal operation parameter data corresponding to the pre-stored correct valve base electronic equipment (these The parameter data is the abnormal numerical data) for comparison. If they are inconsistent, the abnormal test result of the valve-based electronic equipment is: the valve-based electronic equipment cannot detect the abnormal situation normally. If they are consistent, it means that the valve-based electronic equipment is abnormal. The test results are: the valve-based electronic equipment can detect abnormal conditions normally.

Wherein, the first abnormal operation instruction can be set according to the actual situation. The instruction may be an instruction to control the conduction or protection action of the thyristor, or may be a control instruction of communication parameters, or the like.

Preferably, in the above technical solution, the control and protection system is further configured to: send a second abnormal operation command to the HVDC thyristor-level equivalent analog 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 a 12-pulse DC back-to-back physical dynamic Model device; the second abnormal operation command can usually also use the control command related to the conduction of the thyristor.

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

The control and protection system is also used for: acquiring and obtaining abnormal test results of all thyristor triggering monitoring units according to abnormal operation parameter data of all thyristor triggering monitoring units.

Specifically, some second abnormal operation instructions are used to detect that all the thyristor trigger monitoring units can normally find or process the abnormal operation control signals corresponding to these second abnormal operation instructions, and the abnormal operation parameter data of all the thyristor trigger monitoring units that are correctly stored in advance can be detected or processed normally. For comparison, if they are inconsistent, the abnormal test results of all thyristor trigger monitoring units are: all thyristor trigger monitoring units cannot detect abnormal conditions normally. If they are consistent, the abnormal test results of all thyristor trigger monitoring units are: all thyristors The trigger monitoring unit can normally detect abnormal conditions.

Wherein, the second abnormal operation instruction can be set according to the actual situation.

Preferably, in the above technical solution, a data acquisition and supervisory control system (SCADA) is also included, and the control protection system, through the data acquisition and supervisory control system, is equivalent to the high-voltage direct current transmission thyristor-level analog equipment and The 12-pulse DC back-to-back physical dynamic model device performs data interaction, specifically:

1) The control and protection system sends instructions through the data acquisition and monitoring control system to equivalently simulate the working state of the valve-based electronic equipment of the HVDC valve control system to be tested; the working state usually includes a normal state or an abnormal state, fault status, etc.

2) The control and protection system obtains the operating parameter data of the valve base electronic equipment and the operating parameter data of all thyristor trigger monitoring units through the data acquisition and monitoring control system. The parameter data can usually be realized by the command of "thyristor-level overvoltage protection action" trigger;

3) The control and protection system sends the first abnormal operation instruction to the HVDC thyristor-level equivalent analog equipment through the data acquisition and monitoring control system;

4) The control and protection system collects abnormal operation parameter data of the valve base electronic equipment, such as relevant abnormal operation numerical data, through the data acquisition and monitoring control system, and sends it to the control and protection system;

5) The control and protection system sends the second abnormal operation instruction to the HVDC thyristor-level equivalent analog equipment through the data acquisition and monitoring control system;

6) The control and protection system passes through the data acquisition and monitoring control system, and all thyristors trigger the abnormal operation parameter data of the monitoring unit and send it to the control and protection system.

Among them, the control and protection system obtains the specific structure data of the valve-based electronic equipment of the HVDC valve control system to be tested through the field bus standard PROFIBUS of automation technology, and sends the specific structure data to the HVDC transmission through the data acquisition and monitoring control system SCADA. The thyristor-level equivalent simulation device is used for the HVDC thyristor-level equivalent simulation device to equivalently simulate the working state of the valve-based electronic device of the HVDC valve control system to be tested.

The control and protection system specifically obtains the specific structural data of the valve-based electronic equipment of the valve control system of the HVDC power transmission to be tested through multiple control optical signals.

The telemetry in Figure 3 is: the operating parameter data of all thyristor trigger monitoring units and the abnormal operation parameter data of all thyristor trigger monitoring units. The telemetry can be: the control and protection system can also be directly sent to the 12-pulse DC back-to-back physical dynamic model device command to obtain the operation parameter data of all thyristor trigger monitoring units and the abnormal operation parameter data of all thyristor trigger monitoring units.

Preferably, in the above technical solution, the control and protection system is used to: add the abnormal test results of the valve-based electronic equipment and the abnormal test results of all the thyristor trigger monitoring units to the high-voltage direct current transmission to be tested. In the test results of the valve control system.

As shown in FIG. 3 , a fully closed-loop test platform for a HVDC transmission valve control system of the present application includes a 12-pulse DC back-to-back physical dynamic model device, a single-valve thyristor-level equivalent equipment, that is, a HVDC thyristor-level equivalent simulation equipment, control Protection System. Among them, the control and protection system includes the DC control and protection system and the background monitoring system SCADA, that is, the data acquisition and monitoring and control system SCADA. The tested objects are the VBE and multiple TTMs of the HVDC valve control system. These test equipment and the tested objects are organic Combined, the basic operating conditions of the actual HVDC transmission project are simulated, so that the tested product runs under the operating conditions equivalent to the actual project, and its various functions and performances are fully verified.

As the control and monitoring system of the test platform, the control and protection system realizes the functions of starting, stopping, and simulating various working conditions for the test platform, and is the brain of the entire test platform. The control and protection system can monitor and control the switchgear in the 12-pulse DC back-to-back physical dynamic model device through remote measurement and remote control, and control and monitor the DC converter valve in the 12-pulse DC back-to-back physical dynamic model device through VBE and TTM.

The 12-pulse DC back-to-back physical dynamic model device simulates the operating conditions of actual DC transmission projects, including steady-state and transient conditions. It is also the actual controlled object of the tested product VBE and TTM, so the controlled object can be run under the same working conditions as the actual project to achieve the purpose of verifying all functions and performance of the controlled object.

The tested VBE and TTM are used as the interface equipment between the control and protection system and the 12-pulse DC back-to-back physical dynamic model device to assist the control and protection system to realize the DC converter valve equipment in the 12-pulse DC back-to-back physical dynamic model device.

The single-valve thyristor equivalent equipment, that is, the HVDC thyristor-level equivalent analog equipment, is used as the interface device between the tested product VBE and the tested product TTM, and the interface signals between the two are configured according to the number of interface signals in the actual project, so that the The two tested samples are equivalent to the actual operating conditions, improving the test integrity.

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 shown in Figure 4. Among them, the single converter valve in the physical model of the 12-pulse converter valve is composed of 60 to 80 thyristors in series in actual use in the project, and is simulated by a single thyristor, as shown in Figure 5. Under the premise of ensuring equivalent electrical characteristics, it meets the requirements of cost and safety requirements. And each thyristor-level electrical circuit is the same as the actual project, including thyristor, DC balancing resistor, damping resistor and damping capacitor, etc. Its electrical and control characteristics are equivalent to the actual project, and it can be compatible with the thyristor trigger monitoring unit of the tested product to realize the thyristor. Trigger a hardware-in-the-loop test of the monitoring unit. specifically:

As shown in Figure 4, in addition to the two physical models of the 12-pulse converter valve, in order to be equivalent to the complete operating characteristics of the DC transmission project, it also includes converter transformers, voltage regulators, isolation switches, circuit breakers and related measurement devices. And in order to realize the flexible configuration of the test project, an isolation switch (Q31 and Q32) and a resistive load are configured between the two converter valve models.

This 12-pulse DC back-to-back physical dynamic model setup includes two operating and test modes:

1) HVDC operation mode of double 12-pulse converter valve: Q31 is closed, Q32 is open, Q11 is closed, Q12 is closed, Q21 is closed, and Q22 is closed;

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

The 12-pulse DC back-to-back physical dynamic model device is equivalent to the electrical characteristics of the HVDC transmission system of the actual project, simulates the actual operating conditions of the thyristor trigger monitoring unit TTM and the valve base electronic equipment VBE, and realizes the thyristor trigger monitoring unit TTM and valve base electronics. Hardware-in-the-loop test under the full engineering configuration of the equipment VBE.

Among them, the HVDC thyristor-level equivalent simulation equipment is used to simulate the operation state of any level, multi-level or even all thyristor levels in a single valve. The specific structure is shown in Figure 6. The HVDC thyristor-level equivalent analog equipment receives the communication signal of a single thyristor-level and replicates the signal in the device content to achieve the same number as the actual engineering signal. It is mainly composed of an optical signal receiver, an optical signal transmitter, an optical signal duplication and distribution module and an optical signal combining module. For the specific working process, refer to the HVDC thyristor-level equivalent analog device in the application number "201510724793.6" and the subject title "A HVDC Thyristor-level Equivalent Analog Device", which will not be repeated here.

Among them, the DC control and protection system is mainly composed of the main control chassis, the analog value acquisition chassis and the switch value transceiver chassis. It is used to simulate the DC control and protection system of the actual project, and is connected with the valve-based electronic equipment of the tested product to realize the valve-based electronic equipment. The simulation of control and monitoring functions enables the valve base electronic equipment to be tested under the full engineering configuration to improve the test equivalence. The main control chassis realizes the functions of control and protection strategy and communication with the valve base electronic equipment, the analog acquisition chassis realizes the operation electrical data acquisition function of the 12-pulse physical model, and the switch transceiver chassis realizes the circuit breaker and isolation switch control and monitoring functions of the physical model. , the working process of the DC control and protection system is known to those skilled in the art, and will not be repeated here.

Among them, the background monitoring system is an integral converter valve operation monitoring system with a high degree of visualization and easy operation. The specific data used for monitoring are: the operating status of the test thyristor trigger monitoring unit, the operating status of the test valve base electronic equipment, 12-pulse DC back-to-back physical dynamic model device, simulated converter valve failure, test start and stop control, test platform emergency shutdown control, etc.

The start-up process of a fully closed-loop test platform for a HVDC transmission valve control system of the present application is as follows:

The startup of the test platform adopts the method of simulating the startup of the back-to-back DC transmission project. First, adjust the voltage regulators on both sides of the rectifier and inverter (as shown in Figure 2) to the lowest gear (the lowest voltage gear on the transformer valve side), and then switch Q32 separately. , close Q31, then 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 After charging, observe whether the output voltage of the converter transformer conforms to the transformation ratio, and then adjust the voltage regulators on both sides to the rated voltage of the system (for example, 400VDC). At this time, all converter valves are locked, and all 24 TTM boards in the system In the state of energy acquisition, all TTMs will establish communication with the VBE when the TTM is fully energized. At this time, it is possible to observe whether the RFO signal of the VBE is normal through the background, and if it is normal, it indicates that the system has been unlocked.

The rectifier side unlock command is remotely issued from the SCADA background. At this time, the operator observes whether the rated voltage of the DC bus is stable and established. After confirming that it is normal, the inverter side unlock command can be issued. After the rectifier and inverter sides are unlocked normally, they can be uploaded from the VBE. The profibus message confirms that all thyristors are running without failure. At this time, the test platform has the test conditions to support various test items of VBE, and the test can be carried out. The following two test examples are used to illustrate the test items, specifically:

1) VBE thyristor-level overvoltage protection test: The specific method is to use the background SCADA remote control single-valve thyristor-level equivalent equipment to designate a certain valve, such as valve 3, where the xth (or any multiple channels, etc.) and so on ) The communication code reported by the thyristor level to the VBE during the test is "thyristor level overvoltage protection action", then the operator can judge whether the VBE function is normal by observing the profibus message output by the VBE during the test process. When the number of thyristor stages of "thyristor-level overvoltage protection action" exceeds the VBE system redundancy setting, the VBE will report "Valve x thyristor-level overvoltage protection action is super redundant".

2) The thyristor level fault monitoring test of VBE: The principle of this test is designed according to the characteristics of the LCC type converter valve. The thyristor level trigger monitoring board (TTM) needs to take energy from the thyristor level to work, when the thyristor on the thyristor level After a breakdown fault occurs, the thyristor stage is equivalent to a short circuit, and the TTM cannot get energy. At this time, the optical fiber communication transmitted by the TTM to the VBE will have no light. At this time, the VBE cannot monitor the optical signal from the TTM. After the frequency cycle, the VBE considers that the thyristor stage is damaged and performs corresponding actions.

According to the above principles, the specific method of this experiment is to use the background SCADA remote control single-valve thyristor-level equivalent equipment to designate a certain valve, such as valve 3 (Figure 2 or the Y2 valve in Figure 4), where the xth path (or any Multi-channel, etc.) The thyristor stage interrupts the communication optical signal reported to the VBE during the test process, which induces the VBE to think that the thyristor stage is damaged, and the operator observes the profibus message output by the VBE during the test process to determine whether the VBE function is Normally, when the VBE detects that the number of thyristor stages that report "Thyristor-level fault" exceeds the VBE system redundancy setting, the VBE reports "Valve x thyristor-level fault super-redundant".

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

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

The 12-pulse DC back-to-back physical dynamic model device is designed, and the low-voltage physical physical model is innovatively used to be equivalent to the electrical characteristics of the actual engineering HVDC transmission system. The 12-pulse DC back-to-back physical model is used to simulate two converter valves by a single thyristor. It consists of 12-pulse converter, 2 transformers, 2 voltage regulators and multiple circuit breakers and isolating switches. Among them, the converter valve is simulated by a single thyristor, and is compatible with the actual thyristor trigger monitoring unit. The hardware-in-the-loop test of the thyristor trigger monitoring unit is realized for the first time. This model adopts a ring electrical topology, so that the rectifier side and inverter side of the back-to-back DC transmission system use the same AC bus, so that the active power required by the test platform can form a circulating current, reduce the active power dependence on the laboratory power supply, and improve the operation safety of the test platform. .

2) HVDC thyristor-level equivalent analog equipment:

A single-valve thyristor-level equivalent device has been developed, which can flexibly simulate the operation state of any one, multi-stage or even all thyristor stages in a single valve by the operation state of the single-stage thyristor, which overcomes the inability of pure digital simulation system to simulate the converter valve thyristor stage. Real physical transient and steady state characteristics and imperfect signal defects can realize VBE interface and working conditions that are completely equivalent to actual engineering.

3) Background monitoring system:

A set of integrated converter valve operation monitoring system with high degree of visualization and easy operation has been developed, which can intuitively reflect the operating conditions of each thyristor stage in the converter valve, and monitor the operating state and test results of the valve control system under test in real time. It has the characteristics of complete functions, powerful performance, fast data response and strong information processing capabilities.

4) Dynamic test method for all working conditions:

A dynamic model test method for valve control system under all working conditions is proposed, using real DC control protection and background monitoring as the upper control system, which can realize real-time monitoring of thousand-level thyristor of valve control system under full engineering configuration in laboratory environment The comprehensive assessment of the control and protection strategy of the converter valve has realized that the functions and interfaces between the valve control system and the DC control protection system, the background monitoring system, and the converter valve are fully equivalent, so that the various functions and reliability of the valve control system can be achieved. It has been fully verified and reached the optimal experimental evaluation conclusion.

In the embodiment of the present invention, a brand new 12-pulse DC back-to-back physical dynamic model device is designed, as shown in Figure 4, which can cooperate with VBE, TTM and control and protection system 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-controlled system based on the low-voltage physical model. It can be operated either as a complete DC system or as a single rectifier with load. The system parameters are as follows: 1, the voltage and current waveforms of the converter valve are shown in Figures 7, 8, 9 and 10.

Table 1:

serial number parameter name symbol value unit 1 rectifier side DC voltage Udr 420 V 2 Inverter side DC voltage Udi 380 V 3 DC Id 40 A 4 Rectifier side firing angle alpha 15 Power frequency electrical angle 5 Inverter side turn-off angle γ 17 Power frequency electrical angle 6 commutation leakage reactance X 0.18 pu 7 6 number of pulsating series N 2 indivual 8 Line load resistance R 1 Ω 9 Rectifier side commutation to no-load line voltage Ur 166 V 10 Inverter side commutation to no-load line voltage UI 152 V 11 Rectifier side commutation capacity Sr 9400 VA 12 Inverter side commutation capacity Si 8619 VA

The 12-pulse DC back-to-back physical dynamic model device is composed of multiple physical objects, including: 2 12-pulse converter valves with a single valve formed by a single thyristor, 4 on-load voltage regulator transformers, 2 voltage regulators, and multiple circuit breakers It consists of a disconnector, a busbar and multiple voltage and current measuring devices. This physical model adopts a unique ring electrical topology, so that the rectifier side and inverter side of the back-to-back DC transmission system use the same electrical bus, and this bus is connected to the power supply of the laboratory. The advantage of this electrical topology is to make the active power form commutation in the annular electrical circuit, reduce the active power dependence on the laboratory power supply, and reduce the impact on the laboratory power supply.

The single converter valve in the 12-pulse DC back-to-back physical dynamic model device is composed of a thyristor, and it is also equipped with a thyristor damping and voltage equalizing circuit with the same parameters as the engineering site, so that it is fully compatible with the engineering thyristor trigger monitoring unit interface function, which can realize The hardware-in-the-loop test of the thyristor-triggered monitoring unit under test is shown in Figure 11.

In the embodiment of the present invention, a high-voltage direct current transmission thyristor-level equivalent simulation device is developed, which can flexibly simulate the operation state of any stage, multi-stage or even all thyristor stages in a single valve by the operation state of a single-stage thyristor, which overcomes the problem of pure digital simulation. The system cannot simulate the real physical transient and steady state characteristics of the thyristor level of the converter valve and the defects of incomplete signals, so that the VBE interface and working conditions of the tested product are completely equivalent to the actual engineering.

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 stage in the converter valve, and monitor the operating state and test results of the valve control system under test in real time. It can meet the requirements of the operator to call, monitor and operate the operation status of each thyristor stage of the converter valve and the valve control system under test at any time.

In the embodiment of the present invention, a dynamic mode test method for a valve control system under all working conditions is proposed, which adopts the real DC control protection and background monitoring as the upper-layer control system, which can realize the valve control under the full engineering configuration in the laboratory environment. Real-time monitoring of 1000-level thyristors in the system and comprehensive assessment of converter valve control and protection strategies have realized that the functions and interfaces between valve control system and DC control and protection system, background monitoring system and converter valve are fully equivalent, making the HVDC transmission valve fully equivalent. Various functions and reliability of the control system have been fully verified, and the optimal test evaluation conclusion has been reached.

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 and protection system, a background monitoring system and a valve control system for the tested product (VBE and TTM) etc. Through this test platform, it is the first time to realize the comprehensive test of the function and reliability of the valve control system under the full engineering configuration of software and hardware, solving the problem 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 realize the valve control system. The hardware-in-the-loop test defect under the full-engineering configuration of the control system will further improve the reliability of the HVDC converter valve control system and even the HVDC transmission project. In view of the characteristics of valve control system test platform structure, test method, complex interface configuration and huge amount of communication data, the present invention proposes a function and reliability test method for the valve control system of the high-voltage DC converter valve, completes the test platform design, and breaks through the test. Technical difficulties such as interface and functional equivalence research and key equipment development.

As shown in FIG. 12 , a fully closed-loop test method for a HVDC power transmission valve control system according to an embodiment of the present invention includes:

S1, the HVDC thyristor-level equivalent simulation equipment equivalently simulates the working state of the valve-based electronic equipment of the HVDC valve control system to be tested, and obtains the operating parameter data of the valve-based electronic equipment, and according to the valve-based electronic equipment The operating parameter data of the equipment generates a control signal, and outputs the control signal to the 12-pulse DC back-to-back physical dynamic model device;

S2, a 12-pulse DC back-to-back physical dynamic model device used to connect multiple thyristor trigger monitoring units of the HVDC transmission valve control system to be tested, control the operation of all thyristor trigger monitoring units according to the control signal, and obtain all thyristor trigger monitoring units unit operating parameter data;

S3. The control and protection system acquires and obtains the test result of the valve control system of the HVDC power transmission 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.

Preferably, in the above technical solution, it also includes:

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

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-based electronic device according to the first abnormal operation control signal, and obtains The abnormal operation parameter data of the valve-based electronic equipment is sent to the control and protection system;

S12. The control and protection system further acquires and obtains an abnormal test result of the valve-based electronic device according to the abnormal operation parameter data of the valve-based electronic device.

Preferably, in the above technical solution, it also includes:

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

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 a 12-pulse DC back-to-back physical dynamic model device ;

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, obtains abnormal operation parameter data of all thyristor trigger monitoring units, and sends them to the control and protection system;

S23. The control and protection system acquires and obtains abnormal test results of all thyristor trigger monitoring units according to abnormal operation parameter data of all thyristor trigger monitoring units.

Preferably, in the above technical solution, the control and protection system performs data interaction with the HVDC thyristor-level equivalent simulation equipment and the 12-pulse DC back-to-back physical dynamic model device, including:

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

Preferably, in the above technical solution, it also includes:

S4. The control and protection system adds the abnormal test results of the valve-based electronic equipment and the abnormal test results of all the thyristor trigger monitoring units to the test results of the HVDC valve control system to be tested.

In the above embodiments, although the steps are numbered S1, S2, etc., they 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. Within the protection scope of the present invention, it can be understood that in some embodiments, some or all of the above-mentioned embodiments may be included.

In the present invention, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. The utility model provides a full closed loop test platform of high voltage direct current transmission valve accuse system which characterized in that includes: the system comprises a control protection system, high-voltage direct-current transmission thyristor-level equivalent simulation equipment and 12-pulse direct-current back-to-back physical dynamic model devices, wherein the 12-pulse direct-current back-to-back physical dynamic model devices are used for connecting a plurality of thyristor trigger monitoring units of a high-voltage direct-current transmission valve control system to be tested and are connected with each other to form a closed loop;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment is used for: equivalently simulating the working state of valve base electronic equipment of the high-voltage direct-current transmission valve control system to be tested to obtain the operating parameter data of the valve base electronic equipment, generating a control signal according to the operating parameter data of the valve base electronic equipment, and outputting the control signal to the 12-pulse direct-current back-to-back physical dynamic model device;

the 12 pulsating direct current back-to-back physical dynamic model device is used for: controlling all thyristor trigger monitoring units to operate according to the control signal to obtain operating parameter data of all thyristor trigger monitoring units;

the control protection system is used for: and obtaining a test result of the high-voltage direct-current 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.

2. The fully closed loop test platform of the HVDC transmission valve control system according to claim 1, wherein the control protection system is further configured to: sending a first abnormal operation instruction to the high-voltage direct-current transmission thyristor-level equivalent simulation equipment;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment is further used for: generating a first abnormal operation control signal according to the first abnormal operation instruction, controlling the valve base electronic equipment to operate according to the first abnormal operation control signal to obtain abnormal operation parameter data of the valve base electronic equipment, and sending the abnormal operation parameter data to the control protection system;

the control protection system is further configured to: and obtaining an abnormal test result of the valve base electronic equipment according to the abnormal operation parameter data of the valve base electronic equipment.

3. The fully closed loop test platform of the HVDC transmission valve control system according to claim 2, wherein the control protection system is further configured to: sending a second abnormal operation instruction to the high-voltage direct-current transmission thyristor-level equivalent simulation equipment;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment 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 a 12-pulse direct-current back-to-back physical dynamic model device;

the 12 pulsating direct current back-to-back physical dynamic model device is further used for: controlling all thyristor trigger monitoring units to operate according to the second abnormal operation control signal to obtain abnormal operation parameter data of all thyristor trigger monitoring units, and sending the abnormal operation parameter data to the control protection system;

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

4. The full closed loop test platform of the HVDC valve control system according to any one of claims 1 to 3, further comprising a data acquisition and monitoring control system, wherein the control 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 of a HVDC transmission valve control system of claim 3, wherein the control protection system is configured to: and adding the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units into the test results of the high-voltage direct-current transmission valve control system to be tested.

6. A full closed loop test method of a high-voltage direct current transmission valve control system is characterized by comprising the following steps: the following devices which are connected with each other to form a closed loop;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment equivalently simulates the working state of valve base electronic equipment of a high-voltage direct-current transmission valve control system to be tested to obtain 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 pulsating direct-current back-to-back physical dynamic model device;

the 12-pulse direct-current back-to-back physical dynamic model device is used for connecting the thyristor trigger monitoring units of the high-voltage direct-current transmission valve control system to be tested, and controls all the thyristor trigger monitoring units to operate according to the control signal to obtain the operation parameter data of all the thyristor trigger monitoring units;

and the control protection system obtains and obtains a test result of the high-voltage direct-current 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. The full closed-loop test method for the HVDC valve control system according to claim 6, further comprising:

the control protection system sends a first abnormal operation instruction to the high-voltage direct-current transmission thyristor-level equivalent simulation equipment;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment generates a first abnormal operation control signal according to the first abnormal operation instruction, controls the valve base electronic equipment to operate according to the first abnormal operation control signal, obtains abnormal operation parameter data of the valve base electronic equipment, and sends the abnormal operation parameter data to the control protection system;

and the control protection system also acquires and obtains an abnormal test result of the valve base electronic equipment according to the abnormal operation parameter data of the valve base electronic equipment.

8. The full closed-loop test method for the HVDC valve control system according to claim 7, further comprising:

the control protection system sends a second abnormal operation instruction to the high-voltage direct-current transmission thyristor-level equivalent simulation equipment;

the high-voltage direct-current transmission thyristor-level equivalent simulation equipment generates a second abnormal operation control signal according to the second abnormal operation instruction, and sends the second abnormal operation control signal to a 12-pulse direct-current back-to-back physical dynamic model device;

the 12 pulsating direct current back-to-back physical dynamic model device controls all thyristor trigger monitoring units to operate according to the second abnormal operation control signal, obtains abnormal operation parameter data of all thyristor trigger monitoring units, and sends the abnormal operation parameter data to the control protection system;

and the control protection system acquires and obtains abnormal test results of all thyristor trigger monitoring units according to the abnormal operation parameter data of all thyristor trigger monitoring units.

9. The full closed-loop test method for the HVDC valve control system according to any one of claims 6 to 8, wherein the process of the control 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:

and the control protection system performs data interaction with the high-voltage direct-current transmission thyristor-level equivalent simulation equipment and the 12 pulsating direct-current back-to-back physical dynamic model device through the data acquisition and monitoring control system.

10. The full closed-loop test method for the valve control system of the high-voltage direct current transmission according to claim 8, further comprising:

and the control protection system adds the abnormal test results of the valve base electronic equipment and the abnormal test results of all thyristor trigger monitoring units into the test results of the high-voltage direct-current transmission valve control system to be tested.

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