A converter valve thyristor-level interface equivalent device and method

Abstract

The present invention provides a thyristor-level interface equivalent device and method for a converter valve, comprising: a valve-base electronic device VBE trigger monitoring board, a DC converter valve thyristor-level equivalent circuit, and a monitoring unit TTM board; the DC converter valve thyristor-level equivalent circuit is connected to the valve-base electronic device VBE trigger monitoring board and the monitoring unit TTM board, respectively; the DC converter valve thyristor-level equivalent circuit includes a thyristor-level damping and voltage-sharing circuit equivalent unit and a converter valve thyristor-level interface equivalent unit. The technical solution provided by the present invention equates the DC converter valve thyristor-level interface to a thyristor-level damping and voltage-sharing circuit equivalent unit and a converter valve thyristor-level interface equivalent unit, solving the problem of incomplete working condition simulation and insufficient testing caused by the current valve control test platform using digital simulation equipment to simulate the converter valve.

Description

Technical Field

[0001] The present invention belongs to the field of power electronics, and in particular relates to a thyristor-level interface equivalent device and method for a converter valve. Background Art

[0002] The valve control system (VCS) is a core component of HVDC converter valves, used to monitor and protect thyristors, and to collect and process data. Using a VCS test platform not only shortens VCS commissioning time in DC systems and reduces unplanned converter station downtime due to VCS issues, thus creating greater economic benefits, but also improves VCS reliability, reduces equipment maintenance and hardware replacement due to failures, and lowers equipment operation and hardware and software maintenance costs.

[0003] Existing valve-controlled test platforms typically use digital simulation platforms to verify the interface functionality between the valve-based electronics (VBE) and the thyristor triggering and monitoring unit (TTM). While this method is flexible, convenient, and low-cost, simulating the TTM with an optoelectronic conversion interface device presents several drawbacks: First, the lack of a crucial TTM device prevents 1:1 testing of all thyristor-level interfaces, making it difficult to accurately test the bit error rate and transmission capacity of the VBE communication software. Second, the interface functionality between the VBE and TTM is performed using a separate, open-loop test platform, which cannot fully replicate the various VBE operating conditions and interface characteristics. Third, the current test platform uses digital simulation equipment to simulate the converter valve, enabling only functional testing of a simplified valve-controlled system configuration. Fourth, the VBE hardware and software configurations used in the tests differ significantly from those in actual projects, making it impossible to test the VBE system's engineering hardware and software configuration. Consequently, incomplete operating simulation can easily lead to problems during on-site system commissioning or after project commissioning. Consequently, existing test platforms have low VBE system engineering equivalence and cannot fully simulate the hardware, software, and interface logic of an actual VBE system. Summary of the Invention

[0004] To address the problem that current test platforms use digital simulation equipment to simulate converter valves, resulting in incomplete working condition simulation and insufficient testing, the present invention proposes a converter valve thyristor-level interface equivalent device and method, which achieves the purpose of verifying the functions and reliability of all data channels under the VBE system engineering configuration, making the VBE software and hardware function and reliability testing more comprehensive.

[0005] The present invention provides a converter valve thyristor-level interface equivalent device, comprising: a valve base electronic device VBE trigger monitoring board, a DC converter valve thyristor-level equivalent circuit and a monitoring unit TTM board;

[0006] The DC converter valve thyristor-level equivalent circuit is respectively connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board;

[0007] The DC converter valve thyristor-level equivalent circuit comprises a thyristor-level damping and voltage-sharing loop equivalent unit and a converter valve thyristor-level interface equivalent unit.

[0008] The thyristor damping and voltage-sharing circuit equivalent unit comprises a damping circuit and a voltage-sharing circuit connected in series.

[0009] The damping circuit includes damping resistors R1 and R2 connected in parallel and a damping capacitor Rc and a damping resistor Rf connected in series;

[0010] The damping capacitor Rc is connected in series with the damping resistor Rf and then connected in parallel with the damping resistors R1 and R2.

[0011] The voltage balancing circuit includes voltage balancing resistors R3 and R4 connected in series.

[0012] The converter valve thyristor level interface equivalent unit includes: a main control board, a monitoring unit TTM interface equivalent board, a power supply board, a backboard and a light board;

[0013] The signals between the main control board, the monitoring unit TTM equivalent board, and the light board are connected through the backplane;

[0014] The power supply board is connected to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board respectively.

[0015] The main control board includes: DSP chip, FPGA chip, transceiver optical fiber for communicating with the control and protection system according to the HDLC protocol, HDLC hot standby channel, monitoring unit TTM trigger and feedback signal channel, monitoring unit TTM trigger and feedback signal hot standby channel and redundant cold standby channel.

[0016] The TTM interface equivalent board of the monitoring unit includes: an FPGA chip, a backplane communication encoding and decoding module, a valve base electronic device VBE feedback signal encoding module, a valve base electronic device VBE trigger signal decoding module, a peer / local monitoring module, a synchronization state machine module, and an optical fiber channel that corresponds 1:1 to the trigger and receiving channels of the valve base electronic device VBE trigger monitoring board;

[0017] The power supply board supplies power to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board.

[0018] The present invention provides a converter valve thyristor-level interface equivalent method, comprising:

[0019] The thyristor-level equivalent circuit of the DC converter valve is connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board respectively;

[0020] The thyristor-level damping and voltage-sharing circuit equivalent unit of the thyristor-level equivalent circuit of the DC converter valve provides a working power supply for the monitoring unit TTM board and provides thyristor voltage measurement sampling for the monitoring unit TTM board, simulating the actual operating conditions of the monitoring unit TTM board;

[0021] The converter valve thyristor-level interface equivalent unit of the DC converter valve thyristor-level equivalent circuit is used to represent the working conditions and interface characteristics of the equivalent valve-based electronic equipment VBE.

[0022] The power supply board of the converter valve thyristor level interface equivalent unit supplies power to the main control board of the converter valve thyristor level interface equivalent unit, the monitoring unit TTM interface equivalent board and the light board;

[0023] The main control board analyzes the converter valve fault condition simulation instructions issued by the control and protection system and reports the monitoring message of the thyristor trigger signal of the valve control system;

[0024] The TTM interface equivalent board of the monitoring unit multiplexes the optical signals returned by the monitoring unit TTM board and transmits them to the valve base electronics VBE trigger monitoring board and the cascaded converter valve thyristor-level interface equivalent device. It identifies the trigger optical fiber signal from the valve base electronics VBE trigger monitoring board and indicates the trigger signal status via the light board of the converter valve thyristor-level interface equivalent unit. The DC converter valve thyristor-level equivalent system mainly includes the thyristor-level damping and voltage-sharing circuit equivalent system and the converter valve thyristor-level interface equivalent system.

[0025] Compared with the closest existing technology, the technical solution provided by the present invention has the following beneficial effects:

[0026] The technical solution provided by the present invention equates the DC converter valve thyristor-level interface to a thyristor-level damping and voltage-sharing circuit equivalent unit and a converter valve thyristor-level interface equivalent unit, solving the problem of incomplete operating condition simulation and insufficient testing caused by the existing valve control test platform using digital simulation equipment to simulate the converter valve.

[0027] The technical solution provided by the present invention is that the TTM interface equivalent board of the monitoring unit in the converter valve thyristor stage interface equivalent unit achieves a 1:1 correspondence in quantity and function between the trigger monitoring optical signal channel and the VBE trigger monitoring optical signal channel, enabling testing of any one or more thyristor stages of the converter valve, and helping to verify the rationality of the VBE software and hardware design and the effectiveness and compatibility of the VBE interface.

[0028] The technical solution provided by the present invention uses the HDLC protocol to parse the on-site fault condition simulation instructions issued by the control and protection system through the main control board in the converter valve thyristor-level interface equivalent unit. This enables accurate simulation and rapid location of converter valve fault conditions, allowing for timely resolution of converter valve on-site faults and improving the efficiency of VBE on-site commissioning and after-sales service in DC transmission projects.

[0029] The technical solution provided by the present invention realizes the verification and design finalization of VBE function upgrade through cascade expansion of equivalent devices of the converter valve interface.

[0030] The technical solution provided by the present invention realizes the simulation of the actual operating conditions of the TTM board through the thyristor-level damping and voltage-sharing circuit equivalent unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of an equivalent device for a thyristor-stage interface of a converter valve according to the present invention;

[0032] Figure 2 Schematic diagram of a full closed-loop test platform based on a DC control and protection system and a DC back-to-back physical dynamic model according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of an equivalent damping circuit according to an embodiment of the present invention;

[0034] Figure 4 External schematic diagram of the equivalent device of the thyristor stage interface of the converter valve according to the embodiment of the present invention;

[0035] Figure 5 Schematic diagram of the equivalent device principle of the thyristor-level interface of the converter valve according to the embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings:

[0037] Example 1

[0038] like Figure 1 As shown, the present invention provides a converter valve thyristor-level interface equivalent device, comprising: a valve base electronic device VBE trigger monitoring board, a DC converter valve thyristor-level equivalent circuit and a monitoring unit TTM board;

[0039] The DC converter valve thyristor-level equivalent circuit is respectively connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board;

[0040] The DC converter valve thyristor-level equivalent circuit comprises a thyristor-level damping and voltage-sharing loop equivalent unit and a converter valve thyristor-level interface equivalent unit.

[0041] The thyristor damping and voltage-sharing circuit equivalent unit comprises a damping circuit and a voltage-sharing circuit connected in series.

[0042] The damping circuit includes damping resistors R1 and R2 connected in parallel and a damping capacitor Rc and a damping resistor Rf connected in series;

[0043] The damping capacitor Rc is connected in series with the damping resistor Rf and then connected in parallel with the damping resistors R1 and R2.

[0044] The voltage balancing circuit includes voltage balancing resistors R3 and R4 connected in series.

[0045] The converter valve thyristor level interface equivalent unit includes a main control board, a monitoring unit TTM interface equivalent board, a power supply board, a backboard and a light board;

[0046] The signals between the main control board, the monitoring unit TTM equivalent board, and the light board are connected through the backplane;

[0047] The power supply board is connected to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board respectively.

[0048] The main control board includes: DSP chip, FPGA chip, transceiver optical fiber for communicating with the control and protection system according to the HDLC protocol, HDLC hot standby channel, monitoring unit TTM trigger and feedback signal channel, monitoring unit TTM trigger and feedback signal hot standby channel and redundant cold standby channel.

[0049] The TTM interface equivalent board of the monitoring unit includes: an FPGA chip, a backplane communication encoding and decoding module, a valve base electronic device VBE feedback signal encoding module, a valve base electronic device VBE trigger signal decoding module, a peer / local monitoring module, a synchronization state machine module, and an optical fiber channel that corresponds 1:1 to the trigger and receiving channels of the valve base electronic device VBE trigger monitoring board;

[0050] The power supply board supplies power to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board.

[0051] Example 2

[0052] Based on the same concept, the present invention provides a method for equivalent interface of a thyristor stage of a converter valve, comprising:

[0053] The thyristor-level equivalent circuit of the DC converter valve is connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board respectively;

[0054] The thyristor-level damping and voltage-sharing circuit equivalent unit of the thyristor-level equivalent circuit of the DC converter valve provides a working power supply for the monitoring unit TTM board and provides thyristor voltage measurement sampling for the monitoring unit TTM board, simulating the actual operating conditions of the monitoring unit TTM board;

[0055] The converter valve thyristor-level interface equivalent unit of the DC converter valve thyristor-level equivalent circuit is used to represent the working conditions and interface characteristics of the equivalent valve-based electronic equipment VBE.

[0056] The power supply board of the converter valve thyristor level interface equivalent unit supplies power to the main control board of the converter valve thyristor level interface equivalent unit, the monitoring unit TTM interface equivalent board and the light board;

[0057] The main control board analyzes the converter valve fault condition simulation instructions issued by the control and protection system and reports the monitoring message of the thyristor trigger signal of the valve control system;

[0058] The monitoring unit TTM interface equivalent board performs optical splitting and multiplexing of the optical signal returned by the monitoring unit TTM board and sends it to the valve base electronic device VBE trigger monitoring board and the cascaded converter valve thyristor level interface equivalent device respectively, identifies the trigger optical fiber signal of the valve base electronic device VBE trigger monitoring board and indicates the trigger signal status through the light board of the converter valve thyristor level interface equivalent unit.

[0059] Example 3:

[0060] The present invention proposes a thyristor interface equivalent device for converter valves, which together with a small back-to-back 12-pulse DC converter valve, a DC control and protection system, a background monitoring system, etc. can form a new full-closed-loop test platform based on a DC control and protection system and a DC back-to-back physical dynamic model. Figure 2 The figure shows a schematic diagram of a fully closed-loop test platform based on a DC control and protection system and a DC back-to-back physical dynamic model, comprising an upper-level control system consisting of DC control and protection and background monitoring, a converter valve valve control simulation test platform for simulating small back-to-back 12-pulse DC converter valves, a converter valve thyristor interface equivalent device provided by the present invention, and a test product VBE. The fully closed-loop test platform based on the DC control and protection system and the DC back-to-back physical dynamic model can achieve 1:1 real-time monitoring of thousands of thyristors in the valve control system and comprehensive assessment of the converter valve control and protection strategy in a laboratory environment, achieving full equivalence of functions and interfaces between the valve control system and the DC control and protection system, background monitoring system, and converter valves.

[0061] Example 4:

[0062] The DC converter valve thyristor level equivalent circuit provided by the present invention mainly includes a thyristor level damping and voltage-sharing circuit equivalent unit and a converter valve thyristor level interface equivalent circuit. Figure 3 As shown in Figure 1, the equivalent circuit of the thyristor damping and voltage-sharing circuit consists of voltage-sharing resistors R3 and R4, damping resistors R1, R2, and Rf, and a damping capacitor Rc. The damping circuit provides operating power to the TTM, limiting the reverse recovery overshoot voltage during thyristor turn-off, enabling the valve to withstand stress under both normal and abnormal load conditions. The voltage-sharing circuit provides the TTM with thyristor voltage measurement and sampling, simulating its actual operating conditions.

[0063] Figure 4 The external schematic diagram of the equivalent device of the thyristor stage interface of the converter valve is as follows: Figure 4As shown in the figure, the converter valve thyristor-stage interface equivalent unit consists of a main control board, six TTM interface equivalent boards, a power supply board, a backplane, and a light board. The converter valve thyristor-stage interface equivalent unit can flexibly simulate the operating state of any one, multiple, or even all thyristor stages in the converter valve, based on the operating state of a single thyristor. This overcomes the limitations of purely digital simulation systems, which cannot simulate the actual physical transient characteristics of the converter valve thyristor stage and have incomplete signal integrity. It achieves complete equivalence between the VBE interface and operating conditions and actual engineering.

[0064] The main control board, based on a DSP+FPGA multi-processor coordinated control hardware architecture, features a configuration software-based integrated converter valve operation monitoring and thyristor-level status configuration system. It communicates with the control and maintenance system via a pair of transceiver optical fibers using the HDLC protocol. It interprets converter valve fault condition simulation instructions issued by the control and maintenance system and reports thyristor trigger signal monitoring messages to the valve control system. Channels numbered F01 and D01 on the main control board are responsible for HDLC communication with the control and maintenance system. Channels numbered F02 and D02 serve as HDLC hot standby channels. Channels numbered F03 and D03 serve as TTM board trigger and reporting signal channels, respectively. Channels numbered F04 and D04 serve as hot standby channels for TTM board trigger and reporting signals. Channels numbered F05, D05, F06, and D06 serve as redundant cold standby channels.

[0065] The TTM interface equivalent board is designed based on a single-chip high-performance FPGA architecture, and includes a backplane communication encoding and decoding module, a VBE feedback signal encoding module, a VBE trigger signal decoding module, a peer / local monitoring module, and a synchronization state machine module. On the one hand, the TTM board feedback optical signal is optically split and multiplexed and then sent to the VBE trigger monitoring board and the cascaded single-valve thyristor-level interface equivalent device respectively; on the other hand, the trigger optical fiber signal of the VBE trigger monitoring board is identified and the trigger signal status is indicated by sound and light (light board). The optical fiber channels on the TTM interface equivalent board are numbered Dxx for receiving channels and Fxx for transmitting channels, which correspond to the trigger and receiving channels of the VBE trigger monitoring board respectively. Figure 4 As shown, the optical fiber transceiver channels of the TTM interface equivalent board from left to right are numbered 01 to 18 as a group, with a total of 4 groups corresponding to 4 valve modules (the number of thyristors in each valve module is ≤18).

[0066] Example 5

[0067] like Figure 5The schematic diagram of the converter valve thyristor-stage interface equivalent device is shown. The power board provides +5V voltage to the main control board, TTM interface equivalent board, and light board. Various signals between the main control board, TTM interface equivalent board, and light board are connected via the backplane. Furthermore, a converter valve thyristor-stage interface equivalent system can be constructed from 12×N 72-stage equivalent devices, where N represents the number of cascaded converter valve thyristor-stage interface equivalent devices, to simulate the 12-pulsation converter valve thyristor-stage trigger monitoring signals for DC transmission projects. The trigger monitoring optical signal channels of the converter valve thyristor-stage interface equivalent system correspond exactly 1:1 in number and function to those of the VBE. The interface equivalent system allows for simultaneous simulation of 72×N×12 thyristor stages (N≥1).

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading this application, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the application.

Claims

1. A converter valve thyristor level interface equivalent device, characterized in that: include: Valve base electronic equipment VBE trigger monitoring board, DC converter valve thyristor stage equivalent circuit and monitoring unit TTM board; The DC converter valve thyristor-level equivalent circuit is respectively connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board; The DC converter valve thyristor-level equivalent circuit includes a thyristor-level damping and voltage-sharing loop equivalent unit and a converter valve thyristor-level interface equivalent unit; The thyristor-level damping and voltage-sharing circuit equivalent unit comprises a damping circuit and a voltage-sharing circuit connected in series; The damping circuit includes damping resistors R1 and R2 connected in parallel and a damping capacitor Rc and a damping resistor Rf connected in series; The damping capacitor Rc is connected in series with the damping resistor Rf and then connected in parallel with the damping resistors R1 and R2; The damping circuit provides the TTM with working power, limits the reverse recovery overshoot voltage when the thyristor is turned off, and enables the valve to withstand stress under normal and abnormal load conditions. The voltage equalization circuit provides the TTM with thyristor voltage measurement sampling to simulate the actual operating conditions of the TTM. The converter valve thyristor level interface equivalent unit includes a main control board, a monitoring unit TTM interface equivalent board, a power supply board, a backboard and a light board; The monitoring unit TTM interface equivalent board includes: FPGA chip, backplane communication encoding and decoding module, valve base electronic equipment VBE feedback signal encoding module, valve base electronic equipment VBE trigger signal decoding module, peer / local monitoring module, synchronization state machine module and optical fiber channel corresponding 1:1 to the trigger and receiving channel of the valve base electronic equipment VBE trigger monitoring board.

2. The converter valve thyristor stage interface equivalent device according to claim 1, characterized in that: The voltage balancing circuit includes voltage balancing resistors R3 and R4 connected in series.

3. The converter valve thyristor stage interface equivalent device according to claim 1, characterized in that: The signals between the main control board, the monitoring unit TTM equivalent board, and the light board are connected through the backplane; The power supply board is connected to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board respectively.

4. The converter valve thyristor stage interface equivalent device according to claim 3, characterized in that: The main control board includes: DSP chip, FPGA chip, transceiver optical fiber for communicating with the control and protection system according to the HDLC protocol, HDLC hot standby channel, monitoring unit TTM trigger and feedback signal channel, monitoring unit TTM trigger and feedback signal hot standby channel and redundant cold standby channel.

5. The converter valve thyristor stage interface equivalent device according to claim 3, characterized in that: The power supply board supplies power to the main control board, the monitoring unit TTM interface equivalent board, the backboard and the light board.

6. A converter valve thyristor level interface equivalent method, characterized in that: include: The thyristor-level equivalent circuit of the DC converter valve is connected to the valve base electronic equipment VBE trigger monitoring board and the monitoring unit TTM board respectively; The thyristor-level damping and voltage-sharing circuit equivalent unit of the thyristor-level equivalent circuit of the DC converter valve provides a working power supply for the monitoring unit TTM board and provides thyristor voltage measurement sampling for the monitoring unit TTM board, simulating the actual operating conditions of the monitoring unit TTM board; The converter valve thyristor-level interface equivalent unit of the DC converter valve thyristor-level equivalent circuit is used to represent the working conditions and interface characteristics of the equivalent valve-based electronic equipment VBE; The thyristor-level damping and voltage-sharing circuit equivalent unit comprises a damping circuit and a voltage-sharing circuit connected in series; The damping circuit includes damping resistors R1 and R2 connected in parallel and a damping capacitor Rc and a damping resistor Rf connected in series; The damping capacitor Rc is connected in series with the damping resistor Rf and then connected in parallel with the damping resistors R1 and R2; The damping circuit provides the TTM with working power, limits the reverse recovery overshoot voltage when the thyristor is turned off, and enables the valve to withstand stress under normal and abnormal load conditions. The voltage equalization circuit provides the TTM with thyristor voltage measurement sampling to simulate the actual operating conditions of the TTM. The converter valve thyristor level interface equivalent unit includes a main control board, a monitoring unit TTM interface equivalent board, a power supply board, a backboard and a light board; The monitoring unit TTM interface equivalent board includes: FPGA chip, backplane communication encoding and decoding module, valve base electronic equipment VBE feedback signal encoding module, valve base electronic equipment VBE trigger signal decoding module, peer / local monitoring module, synchronization state machine module and optical fiber channel corresponding 1:1 to the trigger and receiving channel of the valve base electronic equipment VBE trigger monitoring board.

7. The converter valve thyristor level interface equivalent method according to claim 6, characterized in that: The power supply board of the converter valve thyristor level interface equivalent unit supplies power to the main control board of the converter valve thyristor level interface equivalent unit, the monitoring unit TTM interface equivalent board and the light board; The main control board analyzes the converter valve fault condition simulation instructions issued by the control and protection system and reports the monitoring message of the thyristor trigger signal of the valve control system; The monitoring unit TTM interface equivalent board processes the optical signal returned by the monitoring unit TTM board through optical splitting and multiplexing and sends it to the valve base electronic device VBE trigger monitoring board and the cascaded converter valve thyristor level interface equivalent device respectively, identifies the trigger optical fiber signal of the valve base electronic device VBE trigger monitoring board and indicates the trigger signal status through the light board of the converter valve thyristor level interface equivalent unit.

Images