Converter valve control equipment with redundancy configuration

Abstract

The invention relates to converter valve control equipment with redundancy configuration, and belongs to the field of direct current transmission converter valve control. The equipment comprises an interface device, the interface device is arranged between valve group units and a control system, the interface device comprises a plurality of interface boards, each interface board comprises a high-speed optical module channel and an optical receiving channel, and the optical receiving channel of each interface board is used for connecting thyristors of different valve group units so as to receive state information of the thyristors of the different valve group units. And the high-speed optical module channel is connected with an optical receiving plate of a control system and is used for sending the received thyristor state information to the control system. The problem that in the prior art, when a light receiving channel of a single-stage thyristor breaks down, receiving of state information of other thyristors is affected is solved.

Description

Technical Field

[0001] The present invention relates to a redundant configuration commutation valve control device, belonging to the field of DC transmission commutation valve control. Background Art

[0002] The commutation valve is the core key equipment of DC transmission. The commutation valve equipment generally consists of three or six valve towers. Each valve tower is composed of multiple valve group units, and each valve group unit is composed of multiple thyristor levels connected in series.

[0003] The state information of the thyristor level includes the thyristor short - circuit state, thyristor trigger state, thyristor protective action state, etc. In traditional commutation valve control devices, the main control system and the standby control system share a single optical receiving board to receive the state information of the thyristor level. When the optical receiving board fails, the two redundant systems of the commutation valve control device cannot receive the state information of the thyristor, resulting in the commutation valve equipment having to be shut down to replace the faulty optical receiving board.

[0004] The Chinese patent application publication document with publication number CN117579137A discloses a connection architecture for realizing redundant communication of the optical receiving channel of a commutation valve control device. The main system and the standby system are both independently configured with a processor board, a power supply board, an optical emission board, and an optical receiving board, achieving a full - redundant configuration of the commutation valve control device. In addition, the input ports of the optical multiplexing module of this architecture are connected to different thyristor control units, and the output ports of the optical multiplexing module are connected to the main control system and the standby system. Through the cross - redundant connection inside the optical multiplexing module, the redundant communication of the commutation valve control device is effectively realized.

[0005] However, the solution of this publication document requires the use of a relatively large number of optical wave multiplexing modules, and one optical wave multiplexing module is connected to two thyristor control units. When a fault occurs in the optical receiving channel of a certain level of thyristor in one thyristor control unit and the optical wave multiplexing module needs to be replaced, it will affect the reception of the state information of the other thyristor control unit, resulting in poor reliability of the commutation valve control device. Summary of the Invention

[0006] The purpose of the present invention is to provide a redundant configuration commutation valve control device to solve the problem that when a fault occurs in the optical receiving channel of a certain level of thyristor in one thyristor control unit in the prior art, it will affect the reception of the state information of other thyristors.

[0007] To achieve the above - mentioned purpose, the solution of the present invention includes: A redundant configuration converter valve control device of the present invention includes a control system. The control system is provided with an optical receiving board, and further includes an interface device. The interface device is used to be arranged between the valve group unit and the control system. The interface device includes a plurality of interface boards. The interface board includes a high-speed optical module channel and an optical receiving channel. The optical receiving channel of each interface board is connected to the thyristors of different valve group units to receive the status information of the thyristors of different valve group units. Each interface board is connected to the optical receiving board of the control system through the high-speed optical module channel, and is used to send the received thyristor status information to the control system.

[0008] Further, the number of interface boards is equal to the number of thyristor stages of each valve group unit. Each interface board is connected to the thyristors at the same position of each valve group unit, and the number of optical receiving channels on each interface board is equal to the number of valve group units.

[0009] Further, the control system includes a main control system and a standby control system. Both the main control system and the standby control system communicate with each valve group unit through the interface device.

[0010] Further, it further includes an optical distributor. The control signals sent by the control system are sent to the thyristors at all levels of the valve control unit through the optical distributor.

[0011] Further, the number of optical distributors is equal to the number of valve group units. Each optical distributor is correspondingly connected to the thyristors at all levels in a valve group unit.

[0012] Further, the thyristor status information is encoded according to the valve group unit position and the operating status of the thyristors. The format and length of the encoding are set according to the communication protocol, transmission rate, and error rate of the interface device and the control system.

[0013] Further, the operating status of the thyristors includes the thyristor short-circuit status, the thyristor trigger status, and the thyristor protective action status.

[0014] The beneficial effects of the present invention are as follows: As an improved invention, the converter valve control device of the present invention includes an interface device arranged between the control system and the valve bank unit. The interface device is mainly composed of a plurality of interface boards. The interface boards are provided with optical receiving channels and high-speed optical module channels. The optical receiving channels of the interface boards are used to connect the thyristors of different valve bank units to receive the thyristor stage status information of different valve bank units. In this way, when a single interface board fails and needs to be replaced, only the thyristors connected to this faulty interface board will be affected. For a valve bank unit, only a small number of thyristors will be affected, and the thyristors of the entire valve bank unit will not be affected, avoiding the situation where the DC system trips due to a problem with one interface board because all thyristors in the thyristor unit are transmitted through one interface board. The high-speed optical module channel is connected to the optical receiving board of the control system and is used to send the received thyristor status information to the control system. Therefore, the problem in the prior art that when a fault occurs in the optical receiving channel of a single-stage thyristor, it will affect the reception of the status information of other thyristors is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural block diagram of a redundant configuration converter valve control device; Figure 2 is a schematic diagram of the interface device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described in detail clearly and completely below with reference to the drawings and embodiments.

[0017] The concept of the present invention is that the device includes an interface device arranged between the control system and the valve bank unit. The interface device is mainly composed of a plurality of interface boards. The interface boards are used to connect the thyristors of different valve bank units through their optical receiving channels to receive the thyristor status information of different valve bank units. The high-speed optical module channels are used to send the received thyristor status information to the control system.

[0018] Device Embodiment: As Figure 1 shown, a redundant configuration converter valve control device mainly includes a control system, an optical distributor and an interface device. Among them, the interface device is arranged between the valve bank unit and the control system. The interface device includes a plurality of interface boards. Each interface board includes a high-speed optical module channel and an optical receiving channel. The optical receiving channel of each interface board is used to connect the thyristors of different valve bank units to receive the status information of the thyristors of different valve bank units. The high-speed optical module channel is connected to the control system and is used to send the received thyristor status information to each control system.

[0019] Specifically, the interface device of the present invention includes a plurality of interface boards and a power supply board. Among them, the interface boards adopt a modular design and are composed of high-speed optical module channels and optical receiving channels.

[0020] It is assumed that the converter valve in this embodiment includes m valve group units, and each valve group unit is provided with n levels of thyristors. The optical receiving channels of each interface board are connected to the thyristors of different valve group units. For the convenience of later maintenance and improvement of the system reliability, in this embodiment, the same interface board receives the back-check signals of the thyristors at the same position of different valve group units. For example, interface board 1 receives the thyristors at the 1st position of valve group unit 1, the thyristors at the 1st position of valve group unit 2,..., the thyristors at the 1st position of valve group unit m; interface board 2 receives the thyristors at the 2nd position of valve group unit 1, the thyristors at the 2nd position of valve group unit 2,..., the thyristors at the 2nd position of valve group unit m, and so on. Interface board n receives the thyristors at the nth position of valve group unit 1, the thyristors at the nth position of valve group unit 2,..., the thyristors at the nth position of valve group unit m. Therefore, the number of optical receiving channels of the interface board is determined according to the number of valve group units connected, and the number of interface boards is determined according to the number of thyristor levels of the valve group units connected. Such a design can ensure to the greatest extent that when a single interface board fails and needs to be replaced, only the thyristors connected to this faulty interface board will be affected. For a valve group unit, only one thyristor will be affected, and the thyristors of the entire valve group unit will not be affected, avoiding the situation that the DC system trips due to the excessive number of faulty thyristors in the whole system. Each thyristor at each level sends its own status information to the control system through the corresponding interface board.

[0021] In this embodiment, the status information of the thyristor level is also called the back-check signal. This status information is encoded according to the valve group unit position and the different operating states of the thyristor levels. The format and length of the encoding are set according to the communication protocol, transmission rate, bit error rate, etc. of the interface device and the control device. The operating states of the thyristors include the thyristor short-circuit state, the thyristor trigger state, and the thyristor protective action state, etc. By collecting the operating states of the thyristors and uploading them to the control device, the control device analyzes and determines the overall operating condition of the converter valve, and issues an alarm prompt or a tripping action for the operation of the converter valve in a timely manner to protect the primary equipment of the converter valve.

[0022] The high-speed optical module channel is used to forward the back-check signals received by the interface board to the optical receiving boards of the primary A control system and the standby B control system. The number of high-speed optical module channels can be flexibly designed. For the two control systems corresponding to different single valves, the data frame content transmitted by the high-speed optical module includes the status information of all thyristor levels connected to this interface board. Figure 2Schematic diagram of the interface device shown, where B5 - B16 are interface boards. The upper 4 channels of each interface board are high - speed optical module channels for connecting to the control systems corresponding to different single valves, and the lower part has multiple optical receiving channels for connecting the thyristors in the valve group units of different single valves. For example, in this embodiment, the optical receiving channels of the B5 interface board can receive the thyristor status information of the 1st position in all valve group units of the 1# single valve and the 2# single valve. These status information are then respectively forwarded by the high - speed optical module channels of the B5 interface board to the main A control system and the standby B control system corresponding to the 1# single valve and the 2# single valve. Figure 2 Among them, B1 and B21 are power supply boards for providing power to the interface device, and the remaining boards B2 - B4 and B17 - B20 are for subsequent expansion.

[0023] The control system in this embodiment adopts a redundant setting, including a main A control system and a standby B control system; both the main A control system and the standby B control system include a main control board, an optical emission board, an optical receiving board, and a processing board. Among them, the optical receiving boards of the control system correspond to different single valves (each single valve consists of multiple valve group units). For example, the 1# single valve is respectively connected to the 1st optical receiving board of the main A control system and the 1st optical receiving board of the standby B control system, and the 2# single valve is respectively connected to the 2nd optical receiving board of the main A control system and the 2nd optical receiving board of the standby B control system. The control system can be configured with multiple optical receiving boards according to requirements to achieve the control of multiple single valves; each optical emission board of the control system is provided with multiple optical emission channels for connecting different optical distributors, and each optical distributor corresponds to 1 valve group unit; the processing board generates control signals (trigger pulses) and status monitoring (status feedback) signals for the corresponding positions after comprehensive processing and analysis based on the received upper - level control signals and the status information of the thyristor stage of this single valve to control the operation of the entire converter valve; the main control board is used to determine when to send the control signals generated by the processing board and, according to the status monitoring signals generated by the processing board, to perform timely alarm processing on faulty thyristors to avoid the problem that the number of faulty thyristors in a single valve exceeds the limit, resulting in the entire valve malfunctioning and tripping. In this embodiment, when the main A control system of the converter valve fails, the original main system of the converter valve control device automatically switches to the standby system, and the original standby system also immediately automatically switches to the main system, and the normal operation of the DC transmission system is not affected during the system switching process.

[0024] To transmit the control signals to each valve group unit, the present invention also sets m optical distributors. Each optical distributor is respectively connected to the corresponding valve group unit. The control system sends the trigger pulses of the single valve to the thyristors at the corresponding positions through the optical emission board and the optical distributor. For example, the optical distributor 1 sends the trigger pulses to n thyristors in the valve group unit 1, and the optical distributor m sends the trigger pulses to n thyristors in the valve group unit m, as Figure 1As shown, the number of optical distributions is equal to the number of valve group units in a single valve, both being m.

Claims

1. A redundantly configured converter valve control device, comprising a control system, wherein the control system is provided with a light receiving board, characterized in that: It also includes an interface device, which is used to be arranged between the valve group unit and the control system. The interface device includes multiple interface boards, and the interface boards include a high-speed optical module channel and an optical receiving channel. The optical receiving channel of each interface board is connected to the thyristors of different valve group units to receive status information of the thyristors of different valve group units. Each interface board is connected to the optical receiving board of the control system through the high-speed optical module channel, and is used to send the received thyristor status information to the control system.

2. The redundantly configured converter valve control device according to claim 1, characterized in that: The number of the interface boards is equal to the number of thyristor stages of each valve group unit, each interface board is connected to the thyristors at the same position of each valve group unit, and the number of light receiving channels on each interface board is equal to the number of valve group units.

3. The redundantly configured converter valve control device according to claim 1, characterized in that: The control system comprises a main control system and a backup control system, and both the main control system and the backup control system communicate with each valve group unit through an interface device.

4. The redundantly configured converter valve control device according to claim 1, characterized in that: It also includes an optical distributor, through which the control signal issued by the control system is sent to the thyristors of each level of the valve control unit.

5. The redundantly configured converter valve control device according to claim 4, characterized in that: The number of the optical distributors is equal to the number of the valve group units, and each optical distributor is connected to a corresponding thyristor of each level in a valve group unit.

6. The redundantly configured converter valve control device according to claim 1, characterized in that: The thyristor status information is encoded according to the position of the valve group unit and the operating status of the thyristor, and the encoding format and length are set according to the communication protocol, transmission rate and bit error rate of the interface device and the control system.

7. The redundantly configured converter valve control device according to claim 6, characterized in that: The operating states of the thyristor include a thyristor short-circuit state, a thyristor triggering state and a thyristor protective action state.

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