Converter valve control system, converter valve control system with adjustable optical channel and optical channel adjusting method of converter valve control system

Abstract

The invention belongs to the technical field of direct current transmission converter valve control, and particularly relates to a converter valve control system, an optical channel adjustable converter valve control system and an optical channel adjusting method of the converter valve control system. Comprising a valve control system and an optical splitter, the input end of the optical splitter is used for connecting any path of output ends of a trigger interface unit in a converter valve assembly, and the output end of the optical splitter is connected with an optical channel detection signal receiving unit of the valve control system. And when the fact that the waveform of the signal received by the optical channel detection signal receiving unit is distorted due to the fact that the optical power exceeds the limit is judged, the waveform of the signal received by the optical channel detection signal receiving unit returns to normal by adjusting the splitting number of the optical splitter in the optical channel. Return waveform distortion of an optical channel detection signal caused by over-limit of optical power can be avoided, the system structure is similar to that of a converter valve control system in the prior art, and transformation can be carried out under the condition that normal operation of the converter valve control system is not affected.

Description

Technical Field

[0001] This invention belongs to the field of DC transmission converter valve control technology, specifically relating to a converter valve control system, an optical channel adjustable converter valve control system, and an optical channel adjustment method for the converter valve control system. Background Technology

[0002] Ultra-high voltage direct current (UHVDC) transmission refers to direct current transmission at voltage levels of ±800kV and above, and related technologies. In recent years, UHVDC technology has developed rapidly, and several UHVDC transmission projects have been built and put into operation in China, greatly alleviating the problem of power shortage in the country.

[0003] The converter valve is a core component of DC power transmission, while the converter valve control equipment is the control and monitoring unit for this equipment. The stability and reliability of the control equipment directly determine the availability of the DC system. The converter valve control equipment and the converter valve assembly transmit information via optical signals to control thyristor triggering. The performance of the optical communication circuit determines the reliable triggering of the thyristors, thus affecting the stability of the DC system.

[0004] Chinese invention patent application CN118869066A proposes a method for optical channel detection in a fully redundant valve control system. This method requires the optical channel detection loop of the converter valve control system to cyclically monitor the trigger signal emitted by the laser diode. In existing technologies, the optical signal is directly fed back to the optical receiving module after being split by a beam splitter. However, this method suffers from drawbacks such as the risk of optical power overload and poor dynamic adjustment capability of optical power. For example, in a current operating converter station in China, a screen refresh issue occurred regarding the generation / disappearance of optical channel fault events. The root cause was that the optical receiving module received optical power exceeding a threshold, causing waveform distortion. Therefore, without changing the existing valve control and fiber optic environment, it is necessary to add an optical loop for the entire optical channel detection to increase attenuation in order to meet the target requirements.

[0005] To achieve optical signal attenuation, Chinese invention patent CN119758530B proposes a method for attenuating optical signals using an adjustable fiber optic attenuator. This method controls attenuation through mechanical spacers, relies on additional components, and is complex to adjust. Chinese utility model patent CN222653134U proposes a multi-channel, high-precision electrically controlled attenuator. However, this electrically controlled attenuator is complex to manufacture and cannot meet the needs of rapid retrofitting without altering the existing valve control and fiber optic environment. Summary of the Invention

[0006] The purpose of this invention is to provide a converter valve control system, an adjustable optical channel converter valve control system, and an optical channel adjustment method for the converter valve control system, in order to solve the technical problem in the prior art where the optical power of the optical channel detection signal exceeds the limit, resulting in waveform distortion.

[0007] To solve the above-mentioned technical problems, the present invention provides a converter valve control system, including n sets of valve control systems, and also including 1 k-splitter, where k>n; The input end of the 1-k splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly. The n optical channels of the output end of the 1-k splitter are respectively connected to the optical channel detection signal receiving units of n valve control systems. The number of beams splitting k of the 1k beam splitter is within a certain range. The method for determining the range is as follows: The minimum optical power attenuation range of the 1k splitter is obtained by subtracting the sensitivity limit of the optical channel detection signal receiving unit in the valve control system from the optical power of the laser emitting module, and then subtracting the total optical power attenuation from the laser emitting module to the 1k splitter along the optical channel detection signal propagation path. This determines the range of values ​​for the splitting number k of the 1k splitter. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit.

[0008] Furthermore, in the valve control system, the output end of the laser emitting unit is connected to the input end of the trigger interface unit in the converter valve assembly via an input optical fiber, and the input end of the 1k splitter is connected to the output end of the trigger interface unit in the converter valve assembly via an output optical fiber. The core diameter of the output optical fiber is smaller than that of the input optical fiber.

[0009] Furthermore, n=2, the two valve control systems include a master valve control system and a slave valve control system. The laser emitting unit of the master valve control system or the slave valve control system sends a laser signal to the converter valve, so that the trigger interface unit in the converter valve assembly that receives the signal sends an optical channel detection signal to the 1-k splitter through the corresponding optical channel. The master valve control system and the slave valve control system obtain the feedback pulse corresponding to the optical channel detection signal from the 1-k splitter through their respective optical channel detection signal receiving units, and then determine the status of the corresponding trigger interface unit to complete the detection of the channel.

[0010] The beneficial effects of this invention are as follows: This invention utilizes the optical power emitted by the laser emitting module of the valve control system, subtracts the upper limit of the sensitivity of the optical channel detection signal receiving unit in the valve control system, and then subtracts the optical power attenuation of the optical channel detection signal propagation path to obtain the minimum optical power attenuation of the 1k splitter. This allows the determination of the minimum number of splits of the 1k splitter. By setting a splitter with a number greater than the minimum number of splits, the optical power of the optical channel detection signal can be attenuated to below the maximum sensitivity of the receiving unit, thus avoiding distortion caused by exceeding the optical power limit.

[0011] To address the aforementioned technical problems, the present invention also provides a converter valve control system with adjustable optical channels, including a valve control system and an adjustable beam splitter. The input end of the adjustable beam splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly, and the output end of the adjustable beam splitter is connected to the optical channel detection signal receiving unit of the valve control system. The main control unit of the valve control system is used to restore the signal waveform received by the optical channel detection signal receiving unit to normal by adjusting the number of beams split by the adjustable beam splitter when the optical power exceeds the limit and causes the signal waveform received by the optical channel detection signal receiving unit to be distorted.

[0012] Furthermore, methods for adjusting the number of beams splitted by the adjustable beam splitter to restore the signal waveform received by the optical channel detection signal receiving unit to normal include: The optical power emitted by the laser emitting module of the valve control system is subtracted from the sensitivity limit of the optical channel detection signal receiving unit in the valve control system, and then the total optical power attenuation along the optical channel detection signal propagation path from the laser emitting module to the adjustable beam splitter. This yields the range of optical power attenuation of the adjustable beam splitter, and then the range of the number of beams split by the adjustable beam splitter is calculated. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit. Adjusting the electrical signal of the adjustable beam splitter controls the rotation of the optical switch so that the number of beams split by the adjustable beam splitter is within the specified range, thereby restoring the signal waveform received by the optical channel detection signal receiving unit to normal.

[0013] Furthermore, when the main control unit of the valve control system detects that the signal waveform received by the optical channel detection signal receiving unit is distorted, it further determines whether the input optical power exceeds the set optical power saturation threshold. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted. The set optical power saturation threshold is set according to the upper limit of the sensitivity of the optical channel detection signal receiving unit in the valve control system.

[0014] Furthermore, in the valve control system, the output end of the laser emitting unit is connected to the input end of the trigger interface unit in the converter valve assembly via an input optical fiber, and the input end of the adjustable beam splitter is connected to the output end of the trigger interface unit in the converter valve assembly via an output optical fiber. The core diameter of the output optical fiber is smaller than that of the input optical fiber.

[0015] Furthermore, there are two valve control systems, including a master valve control system and a slave valve control system. The laser emitting unit of the master valve control system or the slave valve control system sends a laser signal to the converter valve, so that the trigger interface unit in the converter valve assembly that receives the signal sends an optical channel detection signal to the adjustable beam splitter through the corresponding optical channel. The master valve control system and the slave valve control system obtain the feedback pulse corresponding to the optical channel detection signal from the adjustable beam splitter through their respective optical channel detection signal receiving units, and then determine the status of the corresponding trigger interface unit to complete the detection of the channel.

[0016] The beneficial effects of this invention are as follows: This invention sets up an adjustable beam splitter in the converter valve control system. When the beam splitter is adjusted to different numbers, the attenuation of the optical signal is different. Based on this adjustable beam splitter, when the optical power exceeds the limit and causes the detection signal to be distorted, it is only necessary to increase the beam splitter number to increase the attenuation and reduce the optical power of the optical channel detection signal to below the maximum sensitivity of the receiving unit, thereby avoiding distortion caused by the optical power exceeding the limit.

[0017] To address the aforementioned technical problems, the present invention also provides a method for adjusting the optical channel of a converter valve control system, comprising: When the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted, the number of beams split by the beam splitter in the optical channel is adjusted to restore the signal waveform received by the optical channel detection signal receiving unit to normal. The converter valve control system includes a valve control system and a beam splitter. The input of the beam splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly, and the output of the beam splitter is connected to the optical channel detection signal receiving unit of the valve control system.

[0018] Furthermore, methods for adjusting the number of beams splitted by the beam splitter to restore the signal waveform received by the optical channel detection signal receiving unit to normal include: The optical power of the laser emitted by the laser emitting module of the valve control system is subtracted from the sensitivity limit of the optical channel detection signal receiving unit in the valve control system, and then the total optical power attenuation from the laser emitting module to the beam splitter along the optical channel detection signal propagation path is subtracted to obtain the range of optical power attenuation of the beam splitter. Then, the range of the number of beams split by the beam splitter can be calculated. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit. Adjusting the electrical signal of the beam splitter controls the rotation of the optical switch to bring the number of beams split by the beam splitter within the specified range, thereby restoring the signal waveform received by the optical channel detection signal receiving unit to normal.

[0019] Furthermore, the method for determining whether the distortion of the signal waveform received by the optical channel detection signal receiving unit is caused by excessive optical power includes: Step 1: Perform distortion detection on the signal waveform received by the optical channel detection signal receiving unit. If distortion occurs, proceed to Step 2; otherwise, end the entire process. Step 2: Determine whether the input optical power exceeds the set optical power saturation threshold. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted. Otherwise, the entire process ends.

[0020] The beneficial effects of this invention are as follows: when the beam splitter is adjusted to different splitting numbers, the attenuation of the optical signal is different. Based on this, when the optical power exceeds the limit and causes the detection signal to be distorted, it is only necessary to increase the splitting number of the beam splitter to increase the attenuation and reduce the optical power of the optical channel detection signal to below the maximum sensitivity of the receiving unit, thereby avoiding distortion caused by the optical power exceeding the limit. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the converter valve control system structure of the present invention; Figure 2 This describes the optical channel connection relationship between the input optical fiber, the output optical fiber, and the 1-to-8 optical splitter of the present invention. Figure 3 This is a schematic diagram of the adjustable beam splitter of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] Implementation method of converter valve control system: The converter valve control system of the present invention will be described below in conjunction with a DC retrofit project.

[0024] This invention discloses a converter valve control system, comprising a valve control system and a 1-K splitter, for controlling the converter valve. The converter valve components include a trigger interface unit and a thyristor. Its specific structure is as follows... Figure 1 As shown.

[0025] In this embodiment, the laser emitting unit is a laser diode, and its output end is connected to the input end of the trigger interface unit through the input optical fiber OPT-1, with an output power of 30dBm.

[0026] In this embodiment, the trigger interface unit is an N×M beam splitter, where N=6 and M=21. After passing through the 6×21 beam splitter, the laser signal is evenly divided into 21 paths. One path is input to a 1k beam splitter, and a portion of the laser signal from the remaining 20 paths is used as a thyristor trigger signal to enter the thyristor stage TCE to control the thyristor triggering. The values ​​of N and M are determined by the number of thyristors.

[0027] A valve control system can control multiple valve assemblies simultaneously. For ease of explanation, Figure 1 The diagram shows only one converter valve assembly, corresponding to only one 1-k splitter. In actual use, the number of 1-k splitters should equal the number of valve assemblies.

[0028] In this embodiment, a redundant design is adopted. Therefore, the valve control system includes valve control system A and valve control system B. Each valve control system includes a master control unit, a laser emitting unit, and an optical channel signal detection unit. Valve control system A is the master valve control system, and valve control system B is the slave valve control system. In other embodiments, the master valve control system and the slave control system can be interchanged. During normal operation of the converter valve, the laser emitting unit of the master valve control system or the slave valve control system generates a corresponding laser signal and sends it to the converter valve assembly. The trigger interface unit that receives the signal sends an optical channel detection signal to the 1-diode-k beam splitter through the corresponding optical channel. The master valve control system A directly obtains the response pulse corresponding to the optical channel detection signal from the 1-diode-k beam splitter through its receiving unit or through the data interaction channel between the master and slave valve control systems, and judges the status of the corresponding trigger interface unit to complete the detection of the channel. This allows for direct and accurate location of the trigger interface unit of the faulty converter valve group. Simultaneously, valve control system B can also directly acquire, or through the data exchange channel between the master and slave valve control systems, the feedback pulse corresponding to the optical channel detection signal from the 1-k splitter, and determine the status of the corresponding trigger interface unit. Both valve control systems operate with one system emitting lasers and both capable of detecting the optical channel.

[0029] Before the modification, since the valve control system included a main valve control system A and a slave valve control system B, in order to input the optical channel detection signal into the two valve control systems respectively, a 1-to-2 splitter was set up to input the optical channel detection signal emitted by the trigger receiving unit into the optical channel detection signal receiving units of the main valve control system A and the slave valve control system B respectively.

[0030] The parameters of the 1-to-2 beam splitter are: 1-to-2-200 / 230 beam splitter (3dB ≤ insertion loss ≤ 4dB). The laser diode output power is 30dBm. The parameters of the N×M beam splitter in the converter valve assembly are: 6×21-200 / 230 beam splitter (15.5dB ≤ insertion loss ≤ 18dB). The upper limit of the sensitivity of the optical channel detection signal receiving module is 1dBm.

[0031] During optical channel detection, the optical signal with an output power of 30dBm from the laser diode undergoes a first attenuation (between 15.5dB and 18dB) after passing through an N×M beam splitter in the converter valve assembly. It then experiences a second attenuation (between 1 and 2 beam splitters), with an attenuation range of 3dB and 4dB. After attenuation, the optical power of the optical channel detection signal is between 8dBm and 11.5dBm, exceeding the sensitivity limit of the optical channel detection signal receiving module by 1dBm. This poses a risk of signal exceeding the limit, potentially causing distortion in the return pulse waveform of the optical channel detection signal.

[0032] The valve control system for the converter valve according to the present invention is modified as follows: The structure of the converter valve control system remains unchanged before and after the modification, and is still as follows. Figure 1 As shown, the 1-to-2 beam splitter is modified into a 1-to-k beam splitter, where k > 2. In other embodiments, k is greater than the number of valve control systems, n. After beam splitting, n of the k optical paths are used to connect to the optical channel detection signal receiving units of n valve control systems respectively, while the remaining optical paths only serve a beam splitting function and are not used. By inputting the optical signal into more channels, the optical power in each channel is reduced. After beam splitting, only two beam splitting channels output light sources through optical fibers. One of them is connected to the optical channel detection signal receiving module of the main valve control system A through an optical fiber, and the other is connected to the optical channel detection signal receiving module of the slave valve control system B through an optical fiber, as shown. Figure 2 As shown.

[0033] In this embodiment, the optical aperture at the output end of the trigger unit is smaller than the optical fiber aperture at the input end of the trigger unit. This mismatch in optical fiber aperture attenuates the optical signal, preventing the optical signal power from exceeding limits and avoiding optical signal distortion. Specifically, as shown... Figure 2 As shown, the core diameter of the input fiber OPT-1 is 200μm, and the core diameter of the output fiber OPT-2 is 62.5μm. The difference in cross-sectional area between the two can achieve a basic attenuation of 10.1–12.0dB.

[0034] In this embodiment, the k-value of the 1k beam splitter can be estimated based on the optical power of the laser emitted by the laser emitting unit, the upper limit of the sensitivity of the optical channel detection signal receiving module, and the attenuation of the optical channel, as shown in the following example: The laser emitting unit emits a laser with a power of 30 dBm. Subtracting the upper limit of sensitivity (1 dBm) of the optical channel detection signal receiving module, the overall attenuation of the optical channel should be greater than 29 dB. Subtracting the attenuation of the N×M beam splitter (approximately 15.5 dB to 18 dB), the attenuation of the 1-k beam splitter should be greater than 13.5 dB. Alternatively, the laser emitting unit emits a laser with a power of 30 dBm. Subtracting the lower limit of sensitivity (-28 dBm) of the optical channel detection signal receiving module, the overall attenuation of the optical channel should be less than 58 dB. Subtracting the attenuation of the N×M beam splitter (approximately 15.5 dB to 18 dB), the attenuation of the 1-k beam splitter should be less than 40 dB. In summary, the attenuation of the 1-k beam splitter should be between 13.5 and 40 dB.

[0035] Based on the attenuation principle of beam splitters and engineering experience in this field, doubling the number of beams results in an attenuation of optical power of about 3dB. For example, a 1-to-2 split results in an attenuation of 3dB, a 1-to-4 split results in an attenuation of 6dB, and a 1-to-8 split results in an attenuation of 9dB.

[0036] In this embodiment, the core diameter of the input fiber (output fiber OPT2) of the optical splitter is adjusted to create a core diameter mismatch between the input and output fibers, resulting in a certain amount of attenuation. Specifically, the attenuation caused by the core diameter mismatch between the input fiber OPT-1 and the output fiber OPT-2 is approximately 10.1~12.0dB. In this embodiment, k is chosen to be equal to 8, and the core diameter mismatch of the optical splitter causes an attenuation of 10dB, resulting in an attenuation of 19dB for a 1-to-k optical splitter. Therefore, a 1-to-8-62.5 / 125 optical splitter (with 2 channels enabled) is selected. The application effect after the modification is as follows: the 1-to-8-62.5 / 125 optical splitter (with 2 channels enabled) has an attenuation of 19dB; the optical power of the optical receiving module is approximately -5.5dBm, meeting the requirements; the waveform of the optical receiving unit is stable and distortion-free; and the fault alarm rate is 0.

[0037] In summary, the converter valve control system of the present invention has the characteristics of simple structure, and its overall structure is similar to that of the converter valve control system in the prior art. Therefore, it can be modified in the case of DC power transmission projects without interruption of operation, transforming the existing converter valve control system into the converter valve control system of the present invention that can adaptively adjust the optical channel. It can be compatible with laser emitting units with different optical powers. By adaptively adjusting the optical channel, the optical power is attenuated, preventing the optical power of the optical channel detection signal from exceeding the limit, and the distortion rate of the returned waveform of the optical channel detection signal is reduced to zero.

[0038] Implementation method of optical channel adjustable converter valve control system: The difference between this implementation method and the implementation method of the converter valve control system is that the 1-k splitter is an adjustable splitter, and its structure is as follows: Figure 3As shown, the rotation of the rotary optical switch can be controlled by an electrical signal to adjust the number of beams, k. This adjustable beam splitter is existing technology, and its specific structure will not be described in detail.

[0039] Furthermore, the main control unit of the valve control system of the present invention is also used to control the rotating optical switch by controlling the electrical signal of the adjustable 1k splitter according to the feedback pulse waveform of the optical channel detection signal. The main control unit of the valve control system includes a processor, which, when executing a computer program, can implement an adaptive adjustment method for the optical channel, the specific method of which is as follows: Step 1: Perform distortion detection on the signal waveform received by the optical channel detection signal receiving unit. If distortion occurs, proceed to Step 2; otherwise, terminate the entire process.

[0040] Step 2: Determine if the input optical power exceeds the set optical power saturation threshold. The set optical power saturation threshold is based on the upper limit of the sensitivity of the optical channel detection signal receiving module. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted, and Step 3 is executed; otherwise, the entire process ends.

[0041] Step 3: Based on the set optical power saturation threshold, the optical power of the laser emitted by the laser emitting module, and the attenuation of the optical channel, calculate the minimum number of beams splitting k1 of the 1-k beam splitter. Based on the calculation result, adjust the electrical signal of the 1-k beam splitter to control the rotating optical switch so that k > k1. This achieves adaptive adjustment of the optical channel.

[0042] The optical channel adjustable converter valve control system of the present invention has the characteristics of simple structure, and its overall structure is similar to that of the converter valve control system in the prior art. Therefore, it can be modified in the case of DC power transmission projects without interruption of operation, and the existing converter valve control system can be transformed into the converter valve control system of the present invention that can adaptively adjust the optical channel. It can be compatible with laser emitting units with different optical powers. By adaptively adjusting the optical channel, the optical power is attenuated, preventing the optical power of the optical channel detection signal from exceeding the limit, and the distortion rate of the return waveform of the optical channel detection signal is reduced to zero.

[0043] Implementation method of optical channel adjustment in converter valve control system: The optical channel adjustment method of the converter valve control system of the present invention includes the following steps: Step 1: Perform distortion detection on the signal waveform received by the optical channel detection signal receiving unit. If distortion occurs, proceed to Step 2; otherwise, terminate the entire process.

[0044] Step 2: Determine if the input optical power exceeds the set optical power saturation threshold. The set optical power saturation threshold is based on the upper limit of the sensitivity of the optical channel detection signal receiving module. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted, and Step 3 is executed; otherwise, the entire process ends.

[0045] Step 3: Based on the set optical power saturation threshold, the optical power of the laser emitted by the laser emitting module, and the attenuation of the optical channel, calculate the minimum number of beams splitting k1 of the 1-k beam splitter. Based on the calculation result, adjust the electrical signal of the 1-k beam splitter to control the rotating optical switch so that k > k1. This achieves adaptive adjustment of the optical channel.

[0046] The optical channel adjustable converter valve control system of the present invention has the characteristics of simple structure, and its overall structure is similar to that of the converter valve control system in the prior art. Therefore, it can be modified in the case of DC power transmission projects without interruption of operation, and the existing converter valve control system can be transformed into the converter valve control system of the present invention that can adaptively adjust the optical channel. It can be compatible with laser emitting units with different optical powers. By adaptively adjusting the optical channel, the optical power is attenuated, preventing the optical power of the optical channel detection signal from exceeding the limit, and the distortion rate of the return waveform of the optical channel detection signal is reduced to zero.

Claims

1. A converter valve control system, comprising n sets of valve control systems, characterized in that, It also includes a 1-k splitter, where k > n; The input of the 1-k splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly. The n optical channels of the output of the 1-k splitter are respectively connected to the optical channel detection signal receiving units of n valve control systems. The number of beams splitting k of the 1k beam splitter is within a certain range. The method for determining the range is as follows: The minimum optical power attenuation range of the 1k splitter is obtained by subtracting the sensitivity limit of the optical channel detection signal receiving unit in the valve control system from the optical power of the laser emitting module, and then subtracting the total optical power attenuation from the laser emitting module to the 1k splitter along the optical channel detection signal propagation path. This determines the range of values ​​for the splitting number k of the 1k splitter. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit.

2. The converter valve control system according to claim 1, characterized in that, In the valve control system, the output end of the laser emitting unit is connected to the input end of the trigger interface unit in the converter valve assembly via an input optical fiber. The input end of the 1k splitter is connected to the output end of the trigger interface unit in the converter valve assembly via an output optical fiber. The core diameter of the output optical fiber is smaller than that of the input optical fiber.

3. The converter valve control system according to claim 1 or 2, characterized in that, With n=2, the two valve control systems include a master valve control system and a slave valve control system. The laser emitting unit of the master or slave valve control system sends a laser signal to the converter valve, so that the trigger interface unit in the converter valve assembly that receives the signal sends an optical channel detection signal to the 1-k splitter through the corresponding optical channel. The master and slave valve control systems obtain the feedback pulse corresponding to the optical channel detection signal from the 1-k splitter through their respective optical channel detection signal receiving units, and then determine the status of the corresponding trigger interface unit to complete the detection of the channel.

4. A converter valve control system with adjustable optical channel, comprising a valve control system, characterized in that, It also includes an adjustable beam splitter. The input end of the adjustable beam splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly, and the output end of the adjustable beam splitter is connected to the optical channel detection signal receiving unit of the valve control system. The main control unit of the valve control system is used to restore the signal waveform received by the optical channel detection signal receiving unit to normal by adjusting the number of beams split by the adjustable beam splitter when the optical power exceeds the limit and causes the signal waveform received by the optical channel detection signal receiving unit to be distorted.

5. The optical channel adjustable converter valve control system according to claim 4, characterized in that, Methods for adjusting the splitting number of the adjustable beam splitter to restore the signal waveform received by the optical channel detection signal receiving unit to normal include: The optical power emitted by the laser emitting module of the valve control system is subtracted from the sensitivity limit of the optical channel detection signal receiving unit in the valve control system, and then the total optical power attenuation along the optical channel detection signal propagation path from the laser emitting module to the adjustable beam splitter. This yields the range of optical power attenuation of the adjustable beam splitter, and then the range of the number of beams split by the adjustable beam splitter is calculated. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit. Adjusting the electrical signal of the adjustable beam splitter controls the rotation of the optical switch so that the number of beams split by the adjustable beam splitter is within the specified range, thereby restoring the signal waveform received by the optical channel detection signal receiving unit to normal.

6. The optical channel adjustable converter valve control system according to claim 4, characterized in that, When the main control unit of the valve control system detects that the signal waveform received by the optical channel detection signal receiving unit is distorted, it further determines whether the input optical power exceeds the set optical power saturation threshold. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted. The set optical power saturation threshold is set according to the upper limit of the sensitivity of the optical channel detection signal receiving unit in the valve control system.

7. The optical channel adjustable converter valve control system according to any one of claims 4-6, characterized in that, In the valve control system, the output end of the laser emitting unit is connected to the input end of the trigger interface unit in the converter valve assembly via an input optical fiber. The input end of the adjustable beam splitter is connected to the output end of the trigger interface unit in the converter valve assembly via an output optical fiber. The core diameter of the output optical fiber is smaller than that of the input optical fiber.

8. The optical channel adjustable converter valve control system according to any one of claims 4-6, characterized in that, There are two valve control systems: a master valve control system and a slave valve control system. The laser emitting unit of the master or slave valve control system sends a laser signal to the converter valve, so that the trigger interface unit in the converter valve assembly that receives the signal sends an optical channel detection signal to the adjustable beam splitter through the corresponding optical channel. The master and slave valve control systems obtain the feedback pulse corresponding to the optical channel detection signal from the adjustable beam splitter through their respective optical channel detection signal receiving units, and then determine the status of the corresponding trigger interface unit to complete the detection of the channel.

9. A method for adjusting the optical channel in a converter valve control system, characterized in that, include: When it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted, the number of beams split by the beam splitter in the optical channel is adjusted to restore the signal waveform received by the optical channel detection signal receiving unit to normal. The converter valve control system includes a valve control system and a beam splitter. The input of the beam splitter is used to connect to any one of the outputs of the trigger interface unit in the converter valve assembly, and the output of the beam splitter is connected to the optical channel detection signal receiving unit of the valve control system.

10. The optical channel adjustment method for the converter valve control system according to claim 9, characterized in that, Methods for adjusting the number of beams splitter to restore the signal waveform received by the optical channel detection signal receiving unit to normal include: The optical power of the laser emitted by the laser emitting module of the valve control system is subtracted from the sensitivity limit of the optical channel detection signal receiving unit in the valve control system, and then the total optical power attenuation from the laser emitting module to the beam splitter along the optical channel detection signal propagation path is subtracted to obtain the range of optical power attenuation of the beam splitter. Then, the range of the number of beams split by the beam splitter can be calculated. The sensitivity limit includes an upper sensitivity limit and a lower sensitivity limit. Adjusting the electrical signal of the beam splitter controls the rotation of the optical switch to bring the number of beams split by the beam splitter within the specified range, thereby restoring the signal waveform received by the optical channel detection signal receiving unit to normal.

11. The optical channel adjustment method for the converter valve control system according to claim 9, characterized in that, Methods for determining whether optical power exceeding the limit causes distortion of the signal waveform received by the optical channel detection signal receiving unit include: Step 1: Perform distortion detection on the signal waveform received by the optical channel detection signal receiving unit. If distortion occurs, proceed to Step 2; otherwise, end the entire process. Step 2: Determine whether the input optical power exceeds the set optical power saturation threshold. If the input optical power exceeds the set optical power saturation threshold, it is determined that the optical power exceeds the limit, causing the signal waveform received by the optical channel detection signal receiving unit to be distorted. Otherwise, the entire process ends.

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