Converter valve control system trigger recheck loop architecture and fault judgment method

Abstract

The invention belongs to the technical field of high-voltage direct-current power transmission, and discloses a converter valve control system trigger re-check loop architecture and a fault judgment method, and the architecture adopts at least two mutually redundant main control boards, a plurality of light emitting boards, a valve side MSC, a valve end thyristor and a light receiving board. Wherein the valve side MSC and the light receiving board form at least two mutually independent light signal triggering re-checking loops, and each main control board corresponds to at least two loops at the same time. By means of the independent design of the loops, an original common loop is eliminated, when an element in any loop breaks down, the fault is only limited in the loop, state detection of other loops is not affected, and therefore the situation that the valve control system misjudges the multi-channel fault is avoided. By adopting the architecture, the misjudgment risk caused by common loop element faults is effectively solved, and the system reliability is improved; the valve control dual systems can still be used when a single element breaks down, locking of the direct-current system is prevented, and the requirement for direct-current transmission stability is met.

Description

Technical Field

[0001] This invention belongs to the field of high voltage direct current transmission technology, specifically relating to a trigger feedback loop architecture and fault judgment method for a converter valve control system. Background Technology

[0002] In the field of high-voltage direct current (HVDC) transmission, HVDC has been widely used in power transmission due to its advantages such as long transmission distance, large capacity, and low loss. The converter valve, as a core primary device in this project, plays a crucial role in power transmission, and its normal operation is inseparable from the trigger control of the valve control system. The valve control system can not only precisely control the triggering and switching of each stage of thyristors, but also monitor the operating status of the thyristors in real time. Its operational stability is of great significance to the long-term, stable, and reliable operation of HVDC transmission. Currently, the valve control system uses two types of optical devices to send trigger signals: high-power and low-power. Valve control systems using high-power optical devices need to use the valve-side MSC to split several optical trigger signals into multiple channels to achieve optical intensity conversion. During this process, the stable operation of the optical trigger channel directly affects the stable operation of the converter valve; therefore, real-time monitoring of the optical trigger channel status is extremely necessary.

[0003] In the current optical trigger channel detection architecture, when the system is in unlocked operation, multiple high-power optical devices sequentially send inspection pulses every cycle. These pulses are then returned via the valve-side MSC to the optical receiving channel, allowing the valve control system to check the status of the optical trigger channels. However, whether it's a redundant valve control system on the optical transmitter board, optical receiver board, or a fully redundant valve control system, its trigger feedback loop architecture contains a common loop. For example, in a redundant valve control system on the optical receiver board, the common loop includes the valve-side MSC output channel, the trigger feedback fiber, and the optical receiver board's optical receiving channel; in a fully redundant valve control system, the common loop includes the valve-side MSC output channel and the trigger feedback fiber. If any component in the common loop fails, the valve control dual system will misjudge multiple optical trigger channel failures, leading to the unavailability of the valve control dual system and ultimately causing DC system lockout. This fails to meet the requirement that a single component failure should not lead to DC lockout.

[0004] It is evident that the trigger feedback loop architecture in the existing optical trigger channel detection architecture has a common loop. Failure of the common loop components can easily lead to misjudgment of the valve-controlled dual system, resulting in DC system lockout and failing to meet the stability requirements of DC power transmission. Summary of the Invention

[0005] This invention provides a trigger feedback loop architecture and fault diagnosis method for a converter valve control system. In this loop architecture, a fault in any component of the trigger feedback loop will not cause both valve control systems to become unusable, thus meeting the requirement that a single component fault will not cause DC blockage. It can quickly and accurately locate faults in the trigger feedback loop or actual faults in the optical trigger channel.

[0006] To achieve the above objectives, the present invention employs the following technical content: A trigger feedback loop architecture for a converter valve control system includes: At least two redundant main control boards, multiple optical transmitter boards, valve-side MSC, valve-end thyristors, and optical receiver boards; Each main control board is connected to each optical transmitter board and is used to control the optical transmitter board to send trigger signals; Each light-emitting plate is connected to the valve-side MSC; The valve-side MSC is connected to the optical receiver board, forming at least two optical signal triggering and feedback loops, and each optical signal triggering and feedback loop is independent of the others; each main control board corresponds to at least two optical signal triggering and feedback loops at the same time. The valve-side MSC is connected to the valve-end thyristor, forming an optical triggering channel; the valve-end thyristor is connected to the optical receiving board.

[0007] Furthermore, the trigger feedback loop architecture of the converter valve control system includes an on-board redundant valve control system and / or a fully redundant valve control system; Both the redundant valve control system and the fully redundant valve control system on the board include a first main control board and a second main control board. In the redundant valve control system on the board, the first main control board and the second main control board share a set of optical devices. In the fully redundant valve control system, the first main control board and the second main control board are each equipped with a set of optical devices; the optical devices include multiple optical emitting boards and optical receiving boards.

[0008] Furthermore, each valve segment of the redundant valve control system on the board includes a first main control board, a second main control board, three optical emitting boards, a 5×16 valve-side MSC, a valve-end thyristor, and an optical receiving board; The trigger pulses from the optical trigger channels of the three optical emitters are transmitted to the three input terminals of the valve-side MSC through trigger optical fibers; The output terminals 1 to 14 of the valve-side MSC are connected to the valve-side thyristor through an optical triggering channel to trigger the valve-side thyristor; The valve-end thyristor is connected to the optical receiver board; The output terminals 15 and 16 of the valve-side MSC are connected to the optical receiver board through two independent optical signal trigger feedback loops to detect the status of the optical trigger channel.

[0009] Furthermore, the output terminals 15 and 16 of the valve-side MSC are connected to the two optical receiver tubes of the optical receiver board through corresponding optical signal trigger feedback circuits.

[0010] Furthermore, in the redundant valve control system on the board, the trigger pulse of a single valve segment adopts a three-protection-two-redundancy design.

[0011] Furthermore, each valve segment of the fully redundant valve control system includes a first main control board, a second main control board, two sets of optical devices, a 5×16 valve-side MSC, and a valve-end thyristor. Each optical device consists of three optical emitting boards and one optical receiving board; The first main control board is connected to the three corresponding light emitting boards; The second main control board is connected to the corresponding three light emitting boards; In the optical emission boards corresponding to the first main control board and the optical emission boards corresponding to the second main control board, each optical emission board corresponding to the first main control board and each optical emission board corresponding to the second main control board form a trigger group, and each trigger group shares a 2×1 MSC. The three trigger groups are connected to the input terminals of the 5×16 valve-side MSC via 2×1 MSCs respectively; The output terminals 1 to 14 of the valve-side MSC are connected to the valve-side thyristor through an optical triggering channel to trigger the valve-side thyristor; The valve-end thyristor is connected to two optical receiving boards via 1×2MSC respectively; The output terminals 15 and 16 of the valve-side MSC are connected to two optical receiving boards respectively through 1×2 MSCs to detect the status of the optical trigger channel.

[0012] Furthermore, the output terminals 15 and 16 of the valve-side MSC are connected to the two optical receiver tubes of the optical receiver board via 1×2 MSCs, respectively.

[0013] Furthermore, in the fully redundant valve control system, the trigger pulse of a single valve segment adopts a three-protection-two-redundancy design.

[0014] A fault diagnosis method for a converter valve control system, based on the aforementioned trigger feedback loop architecture of a converter valve control system, includes: If the return detection signals of the corresponding optical signal trigger return detection loop of any optical transmitter board are all faulty, then the optical trigger channel corresponding to this optical transmitter board is determined to be in a faulty state, and an alarm signal is uploaded. When all return detection signals of the same main control board corresponding to only one trigger return detection loop are faulty, the current optical signal trigger return detection loop is determined to be in a faulty state, and an alarm signal is uploaded.

[0015] Furthermore, if only one optical signal triggers a fault in the back-detection circuit or the number of optical triggering channel faults is less than 2, then only an alarm signal is uploaded; otherwise, an alarm signal is uploaded and the valve control system is set to an unavailable state.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a trigger feedback loop architecture for a converter valve control system. This architecture employs at least two redundant main control boards, multiple optical transmitter boards, a valve-side MSC, valve-end thyristors, and an optical receiver board. The valve-side MSC and the optical receiver board form at least two independent optical signal trigger feedback loops, with each main control board corresponding to at least two loops simultaneously. Through independent loop design, the original common loop is eliminated. When a component in any loop fails, the fault is confined to that loop and does not affect the status detection of other loops, thus avoiding misjudgment of multi-channel faults by the valve control system. This architecture effectively solves the risk of misjudgment caused by common loop component failures, improving system reliability. Even with a single component failure, the valve control dual system remains usable, preventing DC system blockage and meeting the stability requirements of DC transmission.

[0017] Preferably, this invention supports a unified architecture design for both on-board redundancy and full redundancy valve control system configurations. By defining the configuration relationship between the main control board and optical devices, the independent loop scheme can flexibly adapt to different redundancy modes, retaining the resource-efficient advantages of on-board redundancy while also being compatible with the physical isolation characteristics of full redundancy, significantly improving the engineering applicability of the architecture.

[0018] Preferably, in this invention, for on-board redundant systems, the independent output terminal of the valve-side MSC is dedicated to constructing a dual-return detection loop. Under the condition of shared optical devices, fault isolation is achieved by utilizing a physically separated loop design, overcoming the bottleneck of misjudgment caused by signal sharing in traditional on-board redundant systems.

[0019] Preferably, in this invention, for a fully redundant system, dual main control boards are used to configure independent optical device groups, and physical isolation is achieved through a dedicated MSC. The two systems do not affect each other; even if all optical transmitter boards in one system fail, the other system can still independently perform triggering and detection, achieving true dual fault tolerance.

[0020] Preferably, in this invention, the optical signal triggers a point-to-point direct connection between the return detection circuit and the optical receiver tube, ensuring absolute isolation of the signal transmission paths of each circuit. This design completely avoids the risk of signal sharing, strengthens the independence of the status detection signal, and provides underlying hardware protection for accurate fault location.

[0021] Preferably, in this invention, a three-protection, two-redundancy mechanism is used to design the valve section trigger pulse. When some optical trigger channels malfunction, the fault tolerance capability of the thyristor trigger link is significantly improved, reducing the probability of system downtime due to channel failure from the source.

[0022] Preferably, in this invention, the end-to-end isolation of signals in each loop under a fully redundant architecture is ensured by independently mapping the output terminal of the valve-side MSC to the optical receiver. This design eliminates the possibility of signal sharing between redundant systems, ensures that the detection results of the two systems do not interfere with each other, and improves the confidence of fault diagnosis.

[0023] Preferably, in this invention, a three-protection-two-trigger redundancy mechanism is continued in the fully redundant system. The dual independent systems with channel-level redundancy design form a dual protection system, which can maintain the triggering function even if multiple channels fail within a single system, minimizing the overall system failure risk.

[0024] This invention also provides a fault diagnosis method for a converter valve control system. Based on the aforementioned trigger feedback loop architecture of the converter valve control system, this method firstly determines that the optical trigger channel of a single optical transmitter board is faulty when all independent feedback signals corresponding to that board report a fault, and an alarm is triggered. Secondly, if all feedback signals of a single trigger feedback loop corresponding to the same main control board are faulty, the optical signal trigger feedback loop is determined to be faulty and an alarm is triggered. This method achieves precise isolation of the fault range through loop independence—a single component fault only triggers a local alarm without affecting other loops, avoiding systemic misjudgments caused by common loop failures. This method effectively eliminates the risk of a comprehensive misjudgment of the valve control dual system caused by a common loop fault in the original architecture, ensuring that effective channel detection is maintained even when a single component fails, thereby preventing accidental blocking of the DC system and significantly improving the operational stability and reliability of the DC transmission system.

[0025] Preferably, in this invention, a graded fault handling mechanism is established to dynamically adjust the system state according to the scope of fault impact. Non-critical faults only trigger early warnings, while severe faults shut down the system, maximizing continuous system operation while ensuring safety, and fundamentally eliminating unnecessary DC blockage. Attached Figure Description

[0026] Figure 1 A schematic diagram of the control chassis for the on-board redundant valve control system provided in an embodiment of the present invention; Figure 2 A schematic diagram of a valve section trigger feedback loop provided in an embodiment of the present invention for a redundant valve control system on the board; Figure 3 A schematic diagram of the control chassis of a fully redundant valve control system provided in an embodiment of the present invention; Figure 4 A schematic diagram of a valve section trigger feedback loop provided in a fully redundant valve control system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the trigger feedback loop architecture of a converter valve control system provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the technical problems solved by the present invention, the technical solutions, and the beneficial effects clearer, the following specific embodiments provide a further detailed description of the present invention. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The technical terms involved in this invention are explained as follows: Valve control system: also known as valve-based electronic device (VBE), is a microprocessor-based, redundant, maintenance-free thyristor valve triggering and monitoring system. As an intermediate interface device between the control and protection system and the converter valve, it mainly realizes the thyristor triggering and status monitoring of the converter valve.

[0032] Optical splitter: also called optical splitter (MSC), is an optical fiber junction device with multiple input and multiple output terminals, commonly used for coupling, branching and distributing optical signals.

[0033] As mentioned in the background section, the current detection architecture for optical trigger channels works as follows: When the system is in unlocked operation, multiple high-power optical devices sequentially send a check pulse per cycle. This pulse is then fed back to the optical receiving channel via a return optical signal from the valve-side MSC, allowing the valve control system to check the status of the optical trigger channels. For redundant valve control systems on the optical transmitter and receiver boards, this trigger-and-check loop architecture includes a common loop: the valve-side MSC output channel, the trigger-and-check fiber, and the optical receiving channel on the receiver board. For fully redundant valve control systems, this trigger-and-check loop architecture includes a common loop: the valve-side MSC output channel and the trigger-and-check fiber. A failure in any component of the common loop will cause the dual valve control system to misjudge multiple optical trigger channel failures, rendering both systems unusable and causing DC system lockout, thus failing to meet the requirement that a single component failure should not lead to DC lockout. Therefore, for redundant valve control systems on the receiver board, this trigger-and-check loop architecture includes a common loop: the valve-side MSC output channel, the trigger-and-check fiber, and the optical receiving channel; for fully redundant valve control systems, this trigger-and-check loop architecture includes a common loop: the valve-side MSC output channel and the trigger-and-check fiber. If any component in the common circuit fails, the valve-controlled dual system will misjudge multiple optical trigger channel failures, rendering both valve-controlled dual systems unusable and causing DC system lockout. This fails to meet the requirement that a single component failure will not lead to DC lockout.

[0034] To address the aforementioned issues, this embodiment provides a trigger feedback loop architecture for a converter valve control system. This architecture encompasses on-board redundant valve control systems on the optical transmitter and receiver boards, as well as a fully redundant valve control system. A single component failure in the trigger feedback loop will not render both valve control systems unusable, meeting the requirement that a single component failure will not lead to DC blockage. It can quickly and accurately pinpoint whether the failure is in the trigger feedback loop or a genuine optical trigger channel failure. When only one trigger feedback loop fails or the number of genuine optical trigger channel failures does not reach a predetermined value, the valve control system only sends an alarm signal and will not be rendered unusable, thus improving the availability of the valve control system.

[0035] For example, such as Figure 5 As shown, this embodiment provides a trigger feedback loop architecture for a converter valve control system, including: at least two redundant main control boards, multiple optical transmitter boards, a valve-side MSC, a valve-end thyristor, and an optical receiver board; each main control board is connected to each optical transmitter board to control the optical transmitter board to send trigger signals; each optical transmitter board is connected to the valve-side MSC; the valve-side MSC is connected to the optical receiver board, forming at least two optical signal trigger feedback loops, each optical signal trigger feedback loop being independent of the others; each main control board simultaneously corresponds to at least two optical signal trigger feedback loops. The valve-side MSC is connected to the valve-end thyristor, forming an optical triggering channel; the valve-end thyristor is connected to the optical receiving board.

[0036] For the on-board redundant valve control system of optical transmitter and optical receiver, two optical signals output by the valve-side MSC are sent back to two optical receiver tubes of the optical receiver board of the valve control system via two trigger feedback optical fibers for optical trigger channel detection, so as to realize the complete redundancy design of the trigger feedback loop.

[0037] For a fully redundant valve control system, the valve-side MSC outputs two optical signals to two 1×2 MSCs on the valve control side. Each 1×2 MSC on the valve control side outputs two optical signals to the optical receiving channels of two optical receiving boards on the valve control side for optical trigger channel detection, thus achieving a fully redundant design of the trigger feedback loop.

[0038] The valve control system comprehensively detects the two optical signals returned by the MSC on the valve side to determine whether the fault is in the trigger feedback loop or the optical transmission channel itself. Based on the judgment result, the valve control system decides whether to set it to an unusable state.

[0039] The trigger-based feedback loop architecture will be further described below with reference to the accompanying drawings and specific implementation details of this embodiment: The architecture is illustrated using one valve segment of a 12-pulse converter valve as an example. The trigger feedback loop architecture of the converter valve control system is described using the smallest unit as follows: First, redundant valve control system on the board: The optical transmitter and receiver boards have redundant valve control systems. Taking a single valve section configuration as an example, the valve control system controls the chassis as follows: Figure 1 As shown. The main control board is a fully redundant design, i.e., system A and system B, with one board for system A and one board for system B in each chassis. The optical transmitter board and optical receiver board adopt an on-board redundancy design. In addition to the optical components, the power supply, interfaces and other components of the two systems are also redundantly configured.

[0040] For the on-board redundant valve control system of the optical transmitter and receiver boards, the specific trigger feedback loop architecture design is as follows: Figure 2 As shown, each valve segment is equipped with a 5×16 MSC. The trigger pulse of a single valve segment adopts a three-protect-two redundancy design. The trigger pulses of the optical trigger channels of three different optical emitting boards are transmitted to the three input terminals of the valve-side MSC through the trigger fiber. When the unlocked operation state is activated, the three optical trigger channels send an additional optical pulse sequentially after the rising edge of the CP signal each cycle, which is used by the valve control system to check the status of the optical emitting channels. The valve-side MSC outputs 16 optical signals. Output channels 1-14 can be used to trigger thyristors, and the optical signals of channels 15 and 16 are returned to the two optical receiving tubes of the valve control system optical receiving board through the trigger feedback fiber to detect the status of the optical trigger channels, forming a fully redundant design of the trigger feedback loop.

[0041] Second, a fully redundant valve control system: A fully redundant valve control system, taking a single valve section configuration as an example, has a control chassis such as... Figure 3 As shown in the diagram, the valve control systems A and B in this scheme are designed with separate chassis and screens, and each type of board can be replaced online.

[0042] For a fully redundant valve control system, the specific trigger feedback loop architecture is as follows: Figure 4 As shown. Each valve section is equipped with a 5×16 MSC. The trigger pulse of a single valve section adopts a three-protection-two-redundancy design. The trigger pulses generated by the trigger channels of different optical transmitter boards in the A and B dual systems are transmitted to the three input terminals of the valve-side MSC through three 2×1 MSCs and trigger optical fibers. When the operation is unlocked, the three optical trigger channels of the three optical transmitter boards of the duty system send an additional optical pulse sequentially after the rising edge of the CP signal every cycle, which is used by the valve control system to check the status of the optical transmitter channels. The valve-side MSC outputs 16 optical signals. Output channels 1-14 can be used to trigger thyristors. The optical signals of channels 15 and 16 are connected to the two optical receivers of the VCM dual system optical receiver board through trigger feedback optical fibers and two 1×2 optical splitters to detect the status of the optical trigger channels, forming a fully redundant design of the trigger feedback loop.

[0043] Based on the aforementioned trigger feedback loop architecture of the converter valve control system, this embodiment also provides a fault diagnosis method for the converter valve control system. The fault diagnosis method for the optical trigger channel and trigger feedback loop is the same for both on-board redundant and fully redundant valve control systems, as detailed below: Each optical receiver board is associated with three optical trigger channels. The optical receiver board detects and judges the two trigger return pulses received by the two optical tubes respectively, and sends the data of lost return pulses of the optical trigger channels to the main control board monitoring system. The main control board performs comprehensive judgment and processing on the read data.

[0044] The fault diagnosis method is as follows: Where 1 represents a fault in the trigger check signal, and 0 represents a normal trigger check signal.

[0045] A1 represents the return detection signal status of the first optical transmitter U1 tube returned by the optical receiver board 15 channels; B1 represents the return detection signal status of the first optical transmitter U1 tube returned by the 16 channels of the optical receiver board; A2 represents the return detection signal status of the second optical transmitter U1 tube returned by the optical receiver board 15 channel; B2 represents the return detection signal status of the second optical transmitter U1 tube returned by the 16th channel of the optical receiver board; A3 represents the status of the return signal from the 3rd optical transmitter U1 tube returned by the 15th channel of the optical receiver board; B3 represents the return signal status of the third optical transmitter U1 tube returned by the 16th channel of the optical receiver board.

[0046] First, when either A1 or B1 is 0, the optical trigger channel of the first optical transmitter board U1 is considered to be normal; only when A1 is 1 and B1 is also 1, the optical trigger channel of the first optical transmitter board U1 is considered to be actually faulty, and an alarm signal is uploaded. Second, when either A2 or B2 is 0, the optical trigger channel of the second optical transmitter board U1 is considered to be normal; only when A2 is 1 and B2 is also 1, the optical trigger channel of the second optical transmitter board U1 is considered to be actually faulty, and an alarm signal is uploaded. Third, when either A3 or B3 is 0, the optical trigger channel of the third optical transmitter board U1 is considered to be normal; only when A3 is 1 and B3 is also 1, the optical trigger channel of the third optical transmitter board U1 is considered to be actually faulty, and an alarm signal is uploaded. Fourth, when A1, A2, and A3 are all 1, it is determined that the first optical trigger feedback loop is faulty, and an alarm signal is uploaded; Fifth, when B1, B2, and B3 are all 1, the second optical trigger feedback loop is determined to be faulty, and an alarm signal is uploaded; Sixth, when only one trigger feedback loop fails or the number of optical trigger channel failures is less than two, only an alarm signal is uploaded, and the valve control system is not set to an unavailable state; the valve control system is only set to an unavailable state when two or more trigger channels fail in the same valve section.

[0047] Therefore, the trigger feedback loop architecture and method for a converter valve control system provided by this invention have the following advantages compared to existing trigger feedback loops: The valve control system trigger feedback loop scheme designed in this invention achieves a fully redundant design of the trigger feedback loop. The failure of any component in the trigger feedback loop will not cause both valve control systems to become unavailable, meeting the requirement that a single component failure will not lead to DC blockage. It can quickly and accurately locate whether the failure is in the trigger feedback loop or a real failure in the optical trigger channel. When only one trigger feedback loop fails or the number of real failures in the optical trigger channel does not reach a certain value, the valve control system only sends an alarm signal and will not be set to an unavailable state, thus improving the availability of the valve control system.

[0048] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A trigger feedback loop architecture for a converter valve control system, characterized in that, include: At least two redundant main control boards, multiple optical transmitter boards, valve-side MSC, valve-end thyristors, and optical receiver boards; Each main control board is connected to each optical transmitter board and is used to control the optical transmitter board to send trigger signals; Each light-emitting plate is connected to the valve-side MSC; The valve-side MSC is connected to the optical receiver board, forming at least two optical signal triggering and feedback loops, and each optical signal triggering and feedback loop is independent of the others; each main control board corresponds to at least two optical signal triggering and feedback loops at the same time. The valve-side MSC is connected to the valve-end thyristor, forming an optical triggering channel; the valve-end thyristor is connected to the optical receiving board.

2. The trigger feedback loop architecture of a converter valve control system according to claim 1, characterized in that, The converter valve control system trigger feedback loop architecture includes an on-board redundant valve control system or / and a fully redundant valve control system. Both the redundant valve control system and the fully redundant valve control system on the board include a first main control board and a second main control board. In the redundant valve control system on the board, the first main control board and the second main control board share a set of optical devices. In the fully redundant valve control system, the first main control board and the second main control board are each equipped with a set of optical devices; the optical devices include multiple optical emitting boards and optical receiving boards.

3. The trigger feedback loop architecture of a converter valve control system according to claim 2, characterized in that, Each valve segment of the redundant valve control system on the board includes a first main control board, a second main control board, three optical emitting boards, a 5×16 valve-side MSC, a valve-end thyristor, and an optical receiving board. The trigger pulses from the optical trigger channels of the three optical emitters are transmitted to the three input terminals of the valve-side MSC through trigger optical fibers; The output terminals 1 to 14 of the valve-side MSC are connected to the valve-side thyristor through an optical triggering channel to trigger the valve-side thyristor; The valve-end thyristor is connected to the optical receiver board; The output terminals 15 and 16 of the valve-side MSC are connected to the optical receiver board through two independent optical signal trigger feedback loops to detect the status of the optical trigger channel.

4. The trigger feedback loop architecture of a converter valve control system according to claim 3, characterized in that, The output terminals 15 and 16 of the valve-side MSC are connected to the two optical receiver tubes of the optical receiver board through corresponding optical signal trigger feedback circuits.

5. The trigger feedback loop architecture of a converter valve control system according to claim 3, characterized in that, In the redundant valve control system on the board, the trigger pulse of a single valve segment is designed with a three-protection-two-redundancy configuration.

6. The trigger feedback loop architecture of a converter valve control system according to claim 2, characterized in that, Each valve segment of the fully redundant valve control system includes a first main control board, a second main control board, two sets of optical devices, a 5×16 valve-side MSC, and a valve-end thyristor. Each optical device consists of three optical emitting boards and one optical receiving board; The first main control board is connected to the three corresponding light emitting boards; The second main control board is connected to the corresponding three light emitting boards; In the optical emission boards corresponding to the first main control board and the optical emission boards corresponding to the second main control board, each optical emission board corresponding to the first main control board and each optical emission board corresponding to the second main control board form a trigger group, and each trigger group shares a 2×1 MSC. The three trigger groups are connected to the input terminals of the 5×16 valve-side MSC via 2×1 MSCs respectively; The output terminals 1 to 14 of the valve-side MSC are connected to the valve-side thyristor through an optical triggering channel to trigger the valve-side thyristor; The valve-end thyristor is connected to two optical receiving boards via 1×2MSC respectively; The output terminals 15 and 16 of the valve-side MSC are connected to two optical receiving boards respectively through 1×2 MSCs to detect the status of the optical trigger channel.

7. The trigger feedback loop architecture of a converter valve control system according to claim 6, characterized in that, The output terminals 15 and 16 of the valve-side MSC are connected to the two optical receiver tubes of the optical receiver board through 1×2 MSCs, respectively.

8. The trigger feedback loop architecture of a converter valve control system according to claim 6, characterized in that, In the fully redundant valve control system, the trigger pulse of a single valve segment is designed with a three-protection-two-redundancy configuration.

9. A fault diagnosis method for a converter valve control system, characterized in that, A trigger feedback loop architecture for a converter valve control system according to any one of claims 1-8 includes: If the return detection signals of the corresponding optical signal trigger return detection loop of any optical transmitter board are all faulty, then the optical trigger channel corresponding to this optical transmitter board is determined to be in a faulty state, and an alarm signal is uploaded. When all return detection signals of the same main control board corresponding to only one trigger return detection loop are faulty, the current optical signal trigger return detection loop is determined to be in a faulty state, and an alarm signal is uploaded.

10. The fault diagnosis method for a converter valve control system according to claim 9, characterized in that, If only one optical signal triggers a fault in the back-detection circuit or the number of faults in the optical triggering channel is less than 2, then only an alarm signal is uploaded; otherwise, an alarm signal is uploaded and the valve control system is set to an unavailable state.

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