Valve control device, optical channel polling detection method and converter valve control system

Abstract

The invention relates to a valve control device, an optical channel polling detection method and a converter valve control system. The valve control device comprises a control module, and the control module comprises a control unit, a receiving unit and a plurality of transmitting units. Under the condition that a preset inspection condition is met, the control unit sends an inspection triggering electric signal to each transmitting unit in a time-sharing manner according to a triggering instruction sent by the direct-current power transmission system, and each transmitting unit converts the inspection triggering electric signal into an inspection triggering optical signal and sends the inspection triggering optical signal to the converter valve by utilizing a preset optical channel; the converter valve is indicated to send a re-inspection optical signal to the receiving unit; optical channels between different transmitting units and the converter valve are different; the receiving unit converts the received re-inspection optical signal into a re-inspection electric signal and sends the re-inspection electric signal to the control panel; furthermore, the control unit correspondingly determines the inspection result of each optical channel according to the re-inspection electric signal and each trigger inspection electric signal, so that the optical channel with the fault can be accurately positioned.

Description

Technical Field

[0001] The present application relates to the technical field of converter valve control, and in particular to a valve control device, an optical channel patrol detection method, and a converter valve control system. Background Art

[0002] In a DC transmission system, the AC-DC converter primarily consists of a converter valve, typically composed of dozens of thyristors connected in series. Each thyristor typically requires a matching card that receives pulse information from the valve control system to trigger the thyristor. The valve control system includes two redundant configurations. During normal operation, only one redundant configuration operates, while the other receives data and performs calculations, but does not participate in thyristor control. During normal operation of the converter valve, the optical path within the valve control system must be inspected to ensure its integrity.

[0003] However, the current inspection method can only perform qualitative detection on the optical channel in the valve control system and cannot accurately determine the fault point. Summary of the Invention

[0004] Based on this, it is necessary to provide a valve control device, an optical channel patrol detection method and a converter valve control system that can accurately determine the fault point in order to address the above technical problems.

[0005] In a first aspect, the present application provides a valve control device, comprising a control module, wherein the control module comprises a control unit, a receiving unit, and a plurality of transmitting units; the control unit is respectively connected to a DC power transmission system, each of the transmitting units, and the receiving unit, and the transmitting unit and the receiving unit are also respectively connected to a converter valve; wherein,

[0006] The control unit is configured to send a trigger inspection electrical signal to each of the transmitting units in a time-sharing manner according to a trigger instruction sent by the DC power transmission system when a preset inspection condition is met;

[0007] Each of the transmitting units is configured to convert the trigger inspection electrical signal into a trigger inspection optical signal, and transmit the trigger inspection optical signal to the converter valve via a preset optical channel, thereby instructing the converter valve to transmit a return inspection optical signal to the receiving unit; different transmitting units have different optical channels with the converter valve;

[0008] The receiving unit is used to convert the received return detection optical signal into a return detection electrical signal, and send the return detection electrical signal to the control unit;

[0009] The control unit is further configured to determine the inspection result of each of the optical channels according to the return inspection electrical signal and each of the trigger inspection electrical signals.

[0010] In one embodiment, the trigger inspection electrical signal includes a trigger electrical signal and an inspection electrical signal; the trigger inspection optical signal includes a trigger optical signal and an inspection optical signal; the return inspection optical signal includes a return inspection trigger optical signal and a return inspection test optical signal; the return inspection electrical signal includes a return inspection trigger electrical signal and a return inspection test electrical signal;

[0011] The control unit is further configured to send the trigger electrical signal and the inspection electrical signal to the same transmitting unit in a time-sharing manner;

[0012] The transmitting unit is further configured to convert the trigger electrical signal into a trigger optical signal, and convert the patrol electrical signal into a patrol optical signal, and transmit the trigger optical signal and the patrol optical signal to the converter valve in a time-sharing manner using corresponding optical channels, so as to instruct the converter valve to generate the return-check trigger optical signal according to the trigger optical signal, and to generate the return-check test optical signal according to the patrol optical signal;

[0013] The receiving unit is further configured to convert the received backcheck trigger optical signal into the backcheck trigger electrical signal, convert the received backcheck test optical signal into the backcheck test optical signal, and send the backcheck trigger electrical signal and the backcheck test electrical signal to the control unit.

[0014] In one embodiment, the control module includes a master control module and a slave control module; wherein,

[0015] The control unit in the master control module is also connected to the control unit in the slave control module, and the control unit in the master control module is further configured to send inspection information to the slave control module according to the trigger instruction when a preset inspection condition is met;

[0016] The control unit in the slave control module is further configured to send a trigger inspection electrical signal to each of the transmitting units in the slave control module in a time-sharing manner according to the inspection information, and to send the inspection results of each of the optical channels in the slave control module to the master control module; wherein,

[0017] The main control module and the slave control module send the inspection triggering electrical signal at different times.

[0018] In one embodiment, the control unit in the main control module is further configured to generate an alarm message when the inspection result indicates that one of the optical channels is abnormal;

[0019] The main control module is further configured to generate the alarm information and shut down the valve control function of the main control module when the inspection results of the optical channels in the main control module are all abnormal.

[0020] In one embodiment, the control module is further configured to record an inspection identifier of an optical channel corresponding to a target transmitting unit; the target transmitting unit refers to the transmitting unit to which the control module currently sends the trigger inspection electrical signal.

[0021] In one embodiment, the control unit is further configured to receive a modulation signal sent by the DC transmission system, determine whether the modulation signal satisfies a preset inspection condition, and generate a corresponding judgment result. When the judgment result is to initiate an inspection, the control unit sends a trigger inspection electrical signal to each of the transmitting units in a time-sharing manner according to a trigger instruction sent by the DC transmission system.

[0022] In one embodiment, the modulation signal includes an AC voltage signal, an operation status signal, and a bypass pair status signal;

[0023] The control unit is also used to determine that the judgment result is to start the inspection when the frequency of the bypass pair status signal is a first preset value and the frequency of the AC voltage signal is a second preset value, or when the frequency of the bypass pair status signal is a first preset value, the frequency of the AC voltage signal is a third preset value, and the frequency of the operating status signal is a fourth preset value.

[0024] In a second aspect, the present application further provides an optical channel patrol detection method, which is applied to the valve control device provided in any of the above embodiments, and the method includes:

[0025] When the preset inspection conditions are met, the control unit sends a trigger inspection electrical signal to each transmitting unit in a time-sharing manner according to the trigger instruction sent by the DC transmission system;

[0026] The trigger inspection electrical signal is converted into a trigger inspection optical signal by each of the transmitting units, and the trigger inspection optical signal is sent to the converter valve via a preset optical channel, thereby instructing the converter valve to send a return inspection optical signal to the receiving unit; different optical channels are used between different transmitting units and the converter valve;

[0027] converting the received return detection optical signal into a return detection electrical signal by the receiving unit, and sending the return detection electrical signal to the control unit;

[0028] The control unit determines the inspection result of each optical channel according to the return inspection optical signal and each trigger inspection electrical signal.

[0029] In a third aspect, the present application also provides a converter valve control system, comprising a converter valve and a valve control device provided in any one of the above embodiments.

[0030] In one embodiment, the converter valve includes a trigger electronic board and a thyristor;

[0031] The trigger electronic board is respectively connected to the thyristor, the transmitting unit in the valve control device, and the receiving unit;

[0032] The transmitting unit is further used to send a trigger light signal to the trigger electronic board;

[0033] The trigger electronic board is used to convert the trigger light signal into a conduction electrical signal, and transmit the conduction electrical signal to the thyristor to turn on the thyristor.

[0034] In the aforementioned valve control device, optical channel patrol detection method, and converter valve control system, the valve control device includes a control module. The control module comprises a control unit, a receiving unit, and multiple transmitting units. When preset patrol conditions are met, the control unit, in response to a trigger instruction sent by the DC transmission system, time-sharingly sends a trigger patrol electrical signal to each transmitting unit. Each transmitting unit converts the trigger patrol electrical signal into a trigger patrol optical signal and transmits the trigger patrol optical signal to the converter valve via a preset optical channel, instructing the converter valve to send a return detection optical signal to the receiving unit. The receiving unit converts the received return detection optical signal into a return detection electrical signal and transmits the return detection electrical signal to the control board. The control unit is further configured to determine the patrol result of each optical channel based on the return detection electrical signal and each trigger patrol electrical signal, thereby accurately detecting whether each optical channel is functioning properly. Furthermore, by sending the trigger patrol electrical signal to each transmitting unit in a time-sharing manner and determining the patrol result of the corresponding optical channel in real time based on the return detection electrical signal and the trigger patrol electrical signal, the abnormality can be accurately located. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 Schematic diagram of the structure of a valve control device in one embodiment;

[0037] Figure 2 A schematic structural diagram of a valve control device in another embodiment;

[0038] Figure 3 A logic block diagram of preset inspection conditions in one embodiment;

[0039] Figure 4 1 is a flow chart of an optical channel patrol detection method according to an embodiment;

[0040] Figure 5 FIG. 4 is a timing diagram of an optical channel patrol detection method in an embodiment. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0042] In one embodiment, Figure 1 As shown, the present application provides a valve control device, including a control module. The control module includes a control unit 102, a receiving unit 106, and multiple transmitting units 104. The control unit 102 is connected to the DC transmission system, each transmitting unit 104, and the receiving unit 106. The transmitting unit 104 and the receiving unit 106 are also connected to the converter valve 108.

[0043] The control unit 102 is configured to transmit a trigger inspection electrical signal to each transmitting unit 104 in a time-sharing manner, based on a trigger instruction sent by the DC power transmission system, when a preset inspection condition is met. The preset inspection condition indicates that the DC power transmission system is in a state where no bypass pair is switched on and the system is in an operating state, or that the DC power transmission system is in a state where no bypass pair is switched on and the system is in a state where the system is not unlocked after charging.

[0044] The control unit 102 sends the same trigger inspection signal to each transmitting unit 104. For example, the control unit 102 may first send the trigger inspection signal to the first transmitting unit 104 in a preset order, and then, after a period of time, send the trigger inspection signal to the next transmitting unit 104, until the trigger inspection signal has been sent to all transmitting units 104. Furthermore, after sending the trigger inspection signal to the transmitting units 104, the control unit 102 may wait for a period of time and then continue to send the trigger inspection signal to the first transmitting unit 104 in a preset order to start a new round of inspection testing.

[0045] Each transmitting unit 104 is configured to convert the trigger inspection electrical signal into a trigger inspection optical signal. The trigger inspection optical signal is then transmitted to the converter valve 108 via a pre-set optical channel, instructing the converter valve 108 to transmit a return inspection optical signal to the receiving unit 106. Different transmitting units 104 have different optical channels with the converter valves 108. The optical channel refers to the optical fiber connection between the transmitting unit 104 and the converter valve 108. Upon receiving the trigger inspection optical signal, the converter valve 108 can directly transmit the trigger inspection optical signal as the return inspection optical signal to the receiving unit 106 without performing any processing on the trigger inspection optical signal.

[0046] The receiving unit 106 is configured to convert the received return detection optical signal into a return detection electrical signal and send the return detection electrical signal to the control board.

[0047] The control unit 102 is further configured to determine the inspection result for each optical channel based on the return check signal and each triggered inspection signal. For each optical channel, the control unit 102 may determine that the inspection result for the current optical channel is normal if the return check signal and the triggered inspection signal are consistent. The control unit 102 may also determine that the inspection result for the current optical channel is abnormal if the return check signal is empty or the received return check signal and the triggered inspection signal are inconsistent. An empty return check signal indicates that the receiving unit 106 has not received the return check optical signal.

[0048] In an embodiment of the present application, the valve control device includes a control module. The control module includes a control unit 102, a receiving unit 106, and multiple transmitting units 104. Specifically, when preset inspection conditions are met, the control unit 102 sends a trigger inspection electrical signal to each transmitting unit 104 in a time-sharing manner according to a trigger instruction sent by the DC transmission system. Each transmitting unit 104 converts the trigger inspection electrical signal into a trigger inspection optical signal and sends the trigger inspection optical signal to the converter valve 108 via a preset optical channel, thereby instructing the converter valve 108 to send a return inspection optical signal to the receiving unit 106. The receiving unit 106 converts the received return inspection optical signal into a return inspection electrical signal and sends the return inspection electrical signal to the control board. The control unit 102 is also used to determine the inspection result of each optical channel based on the return inspection electrical signal and each trigger inspection electrical signal, thereby accurately detecting whether each optical channel is normal. In addition, the control module sends a trigger inspection signal to each transmitting unit 104 in a time-sharing manner, and determines the inspection result of the corresponding optical channel in real time based on the return inspection signal and the trigger inspection signal, so as to accurately locate which optical channel has an abnormality.

[0049] In one embodiment, the trigger inspection electrical signal includes a trigger electrical signal and a inspection electrical signal, the trigger inspection optical signal includes a trigger optical signal and a inspection optical signal, the return inspection optical signal includes a return inspection trigger optical signal and a return inspection test optical signal, and the return inspection electrical signal includes a return inspection trigger electrical signal and a return inspection test electrical signal. The trigger electrical signal and the inspection electrical signal have different pulse widths or voltages. For example, the trigger electrical signal can be a double pulse signal with a pulse width and interval of 10 microseconds, and the inspection electrical signal can be a double pulse signal with a pulse width and interval of 15 microseconds. After the trigger electrical signal is converted into a trigger optical signal by the transmitting unit 104, it can be transmitted to the thyristor in the converter valve 108 to control the conduction of the thyristor. After the inspection electrical signal is converted into a trigger optical signal, it will not be transmitted to the thyristor.

[0050] like Figure 1As shown, the control unit 102 is further configured to time-share the sending of a trigger signal and a patrol signal to the same transmitting unit 104. The control unit 102 may first send the trigger signal to the transmitting unit 104, and then, after a period of time, send the patrol signal to the transmitting unit 104. Furthermore, the control unit 102 sends the patrol signal to the current transmitting unit 104 before sending the trigger signal to the next transmitting unit 104.

[0051] The transmitting unit 104 is further configured to convert the trigger electrical signal into a trigger optical signal, and convert the inspection electrical signal into a inspection optical signal, and to use the corresponding optical channel to send the trigger optical signal and the inspection optical signal to the converter valve 108 in a time-sharing manner, so as to instruct the converter valve 108 to generate a return-check trigger optical signal according to the trigger optical signal, and to generate a return-check test optical signal according to the inspection optical signal.

[0052] The receiving unit 106 is further configured to convert the received backcheck trigger optical signal into a backcheck trigger electrical signal, convert the received backcheck test optical signal into a backcheck test optical signal, and send the backcheck trigger electrical signal and the backcheck test electrical signal to the control unit 102 .

[0053] In this embodiment, the control unit 102 sends a trigger electrical signal and a patrol electrical signal to the same transmitting unit 104 in a time-sharing manner. The trigger electrical signal and the patrol electrical signal are different. The transmitting unit 104 converts the trigger electrical signal and the patrol electrical signal into different trigger optical signals and patrol optical signals to send to the converter valve 108. This can prevent the converter valve 108 from transmitting the patrol optical signal to the thyristor, causing abnormal conduction of the thyristor.

[0054] In one embodiment, Figure 2 As shown, the control module includes a master control module 210 and a slave control module 220. The master control module 210 and the slave control module 220 respectively include a control unit, a receiving unit and a plurality of transmitting units.

[0055] The control unit 212 in the master control module is connected to the control unit 222 in the slave control module. The control unit 212 in the master control module is also used to send inspection information to the slave control module 220 according to the trigger instruction when the preset inspection conditions are met. The inspection information includes the information that triggers the inspection electrical signal and the inspection order of each transmitting unit.

[0056] The control unit 222 in the slave control module is further configured to send a trigger inspection electrical signal to each transmitting unit 224 in the slave control module in a time-sharing manner according to the inspection information, and to send the inspection results of each optical channel in the slave control module 220 to the master control module 210 .

[0057] The main control module 210 and the slave control module 220 send the inspection triggering electrical signal at different times.

[0058] For example, the master control module 210 may first send a trigger inspection electrical signal to each transmitting unit 214 in the master control module in a time-sharing manner. After the inspection of each optical channel in the master control module 210 is completed, the master control module 210 sends inspection information to the slave control module 220. The control unit 222 in the slave control module sends a trigger inspection electrical signal to each transmitting unit 224 in the slave control module in a time-sharing manner to perform an inspection of each optical channel in the slave control module 220.

[0059] When controlling the converter valve, the main control module 210 generally controls the converter valve 230. If the main control module 210 experiences an abnormality, the slave control module 220 controls the converter valve 230. Therefore, it is necessary to inspect each optical channel in the slave control module 220 to ensure that each optical channel can properly transmit the trigger optical signal. Furthermore, if the main control module 210 is functioning normally, the trigger optical signal sent by the control unit in the slave control module 220 to the converter valve 230 will not be transmitted to the thyristor in the converter valve 230.

[0060] Furthermore, the control unit 212 in the main control module is also used to generate an alarm message when the inspection result shows that there is an abnormality in one optical channel, so as to prompt the operation and maintenance personnel which optical channel has the abnormality.

[0061] The master control module 210 is further configured to generate an alarm and disable the valve control function of the master control module 210 if all inspection results of the optical channels in the master control module 210 are abnormal. After the valve control function of the master control module 210 is disabled, the valve control function of the slave control module 220 is enabled, and the slave control module 220 controls the conduction of the thyristors in the converter valve 230.

[0062] In one embodiment, Figure 1 As shown, the control module is also configured to record the inspection identifier of the optical channel corresponding to the target transmitting unit. The target transmitting unit is the transmitting unit 104 to which the control module is currently sending the inspection trigger signal. Based on the inspection identifier, the control module can determine whether the inspection trigger signal has been sent to all transmitting units 104. If an optical channel is found to be abnormal, the control module can display the inspection identifier of that optical channel to enable maintenance personnel to quickly locate the abnormal optical channel.

[0063] In one embodiment, the control unit is further configured to receive a modulation signal sent by a DC transmission system, determine whether the modulation signal satisfies a preset inspection condition, and generate a corresponding judgment result. When the judgment result is to initiate an inspection, a trigger inspection electrical signal is sent to each transmitting unit in a time-sharing manner according to a trigger instruction sent by the DC transmission system.

[0064] The modulation signal includes an AC voltage signal, an operation status signal and a bypass pair status signal;

[0065] The control unit is also used to determine that the judgment result is to start the inspection when the frequency of the bypass status signal is a first preset value and the frequency of the AC voltage signal is a second preset value, or when the frequency of the bypass status signal is a first preset value, the frequency of the AC voltage signal is a third preset value, and the frequency of the operating status signal is a fourth preset value.

[0066] like Figure 3 As shown, BPPO=10kHz indicates that the frequency of the bypass pair status signal is the first preset value, VLOTAGE=1MHz indicates that the frequency of the AC voltage signal is the second preset value, VLOTAGE=10kHz indicates that the frequency of the AC voltage signal is the third preset value, and DEBLOCK=1MHz indicates that the frequency of the operating status signal is the fourth preset value.

[0067] Based on the same inventive concept, the present application also provides an optical channel patrol detection method, which is applied to the valve control device provided in any of the above embodiments, such as Figure 4 As shown, the optical channel patrol detection method includes steps S402-S408.

[0068] S402 : When a preset inspection condition is met, the control unit sends a trigger inspection electrical signal to each transmitting unit in a time-sharing manner according to a trigger instruction sent by the DC power transmission system.

[0069] S404: Convert the trigger inspection electrical signal into a trigger inspection optical signal through each transmitting unit, and send the trigger inspection optical signal to the converter valve via a preset optical channel to instruct the converter valve to send a return inspection optical signal to the receiving unit; different transmitting units have different optical channels with the converter valve.

[0070] S406 , converting the received return detection optical signal into a return detection electrical signal through the receiving unit, and sending the return detection electrical signal to the control unit.

[0071] S408 , determining the inspection result of each optical channel respectively according to the return inspection optical signal and each triggered inspection electrical signal through the control unit.

[0072] The detailed description of the above steps S402-S408 can be found in the above description of the valve control device, which will not be repeated here.

[0073] In an embodiment of the present application, when preset inspection conditions are met, the control unit sends a trigger inspection electrical signal to each transmitting unit in a time-sharing manner according to a trigger instruction sent by the DC transmission system. Each transmitting unit converts the trigger inspection electrical signal into a trigger inspection optical signal and uses a preset optical channel to send the trigger inspection optical signal to the converter valve to instruct the converter valve to send a return inspection optical signal to the receiving unit. The receiving unit converts the received return inspection optical signal into a return inspection electrical signal and sends the return inspection electrical signal to the control board. The control unit is also used to determine the inspection result of each optical channel based on the return inspection electrical signal and each trigger inspection electrical signal, thereby achieving accurate detection of whether each optical channel is normal. In addition, by sending the trigger inspection electrical signal to each transmitting unit in a time-sharing manner and determining the inspection result of the corresponding optical channel in real time based on the return inspection electrical signal and the trigger inspection electrical signal, it is possible to accurately locate which optical channel has an abnormality.

[0074] In order to better illustrate the process of using the valve control device to perform optical channel patrol detection, a more specific embodiment is given for illustration. Figure 2 As shown, the valve control device includes a master control module 210 and a slave control module 220 , and each control module includes two transmitting units.

[0075] like Figure 5 As shown, when the preset inspection conditions are met, the DC transmission system sends a trigger instruction to the control unit 212 of the main control module 210, and the control unit 212 sends a double-pulse trigger electrical signal with a width and interval of 10 microseconds to the first transmitting unit 214. After a certain delay, the control unit 212 opens the monitoring window and sends a double-pulse inspection electrical signal with a width and interval of 15 microseconds to the first transmitting unit 214. At the same time, the control unit 212 records the inspection flag of the current transmitting unit as 1. The control unit 212 determines whether the current optical channel is normal based on the return test electrical signal sent by the receiving unit 216. If the return test electrical signal is empty, or the return test electrical signal is inconsistent with the inspection electrical signal, the current optical channel is determined to be abnormal. After a certain delay, the control unit 212 sends the trigger electrical signal and the inspection electrical signal to the next transmitting unit 214 in a time-sharing manner until the inspection flag reaches 4.

[0076] When the number of abnormal optical channels is one, the control unit 212 only outputs an alarm and maintains VBEA_OK at 1 MHz. When both optical channels in the master control module 210 are abnormal, the control unit 212 outputs an alarm and sets VBEA_OK to 10 kHz, disabling the valve control function of the master control module 210 and enabling the valve control function of the slave control module 220. VBEA_OK = 1 MHz indicates that the valve control function of the master control module 210 is enabled, while VBEA_OK = 10 kHz indicates that the valve control function of the master control module 210 is disabled.

[0077] After a period of time, the inspection process of the four optical channels begins again.

[0078] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0079] In one embodiment, the present application further provides a converter valve control system, which includes a converter valve and a valve control device provided in any of the above embodiments.

[0080] In one embodiment, a converter valve includes a triggering electronic board and a thyristor. The triggering electronic board is connected to the thyristor, a transmitting unit in the valve control device, and a receiving unit. The transmitting unit is also configured to send a triggering optical signal to the triggering electronic board. The triggering electronic board converts the triggering optical signal into a conduction electrical signal and transmits the conduction electrical signal to the thyristor, thereby turning it on.

[0081] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0082] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A valve control device, characterized in that: It includes a control module, which includes a control unit, a receiving unit and multiple transmitting units; the control unit is connected to the DC power transmission system, each of the transmitting units and the receiving unit respectively, and the transmitting unit and the receiving unit are also connected to the converter valve respectively; wherein, The control unit is configured to send a trigger inspection electrical signal to each of the transmitting units in a time-sharing manner according to a trigger instruction sent by the DC power transmission system when a preset inspection condition is met; Each of the transmitting units is configured to convert the trigger inspection electrical signal into a trigger inspection optical signal, and transmit the trigger inspection optical signal to the converter valve via a preset optical channel, thereby instructing the converter valve to transmit a return inspection optical signal to the receiving unit; different transmitting units have different optical channels with the converter valve; The receiving unit is used to convert the received return detection optical signal into a return detection electrical signal, and send the return detection electrical signal to the control unit; The control unit is further configured to determine the inspection result of each of the optical channels according to the return inspection electrical signal and each of the trigger inspection electrical signals.

2. The valve control device according to claim 1, characterized in that: The trigger inspection electrical signal includes a trigger electrical signal and an inspection electrical signal; The trigger inspection optical signal includes a trigger optical signal and an inspection optical signal; the return inspection optical signal includes a return inspection trigger optical signal and a return inspection test optical signal; the return inspection electrical signal includes a return inspection trigger electrical signal and a return inspection test electrical signal; The control unit is further configured to send the trigger electrical signal and the inspection electrical signal to the same transmitting unit in a time-sharing manner; The transmitting unit is further configured to convert the trigger electrical signal into a trigger optical signal, and convert the patrol electrical signal into a patrol optical signal, and transmit the trigger optical signal and the patrol optical signal to the converter valve in a time-sharing manner using corresponding optical channels, so as to instruct the converter valve to generate the return-check trigger optical signal according to the trigger optical signal, and to generate the return-check test optical signal according to the patrol optical signal; The receiving unit is further configured to convert the received backcheck trigger optical signal into the backcheck trigger electrical signal, convert the received backcheck test optical signal into the backcheck test optical signal, and send the backcheck trigger electrical signal and the backcheck test electrical signal to the control unit.

3. The valve control device according to claim 1, characterized in that: The control module includes a master control module and a slave control module; wherein, The control unit in the master control module is also connected to the control unit in the slave control module, and the control unit in the master control module is further configured to send inspection information to the slave control module according to the trigger instruction when a preset inspection condition is met; The control unit in the slave control module is further configured to send a trigger inspection electrical signal to each of the transmitting units in the slave control module in a time-sharing manner according to the inspection information, and to send the inspection results of each of the optical channels in the slave control module to the master control module; wherein, The main control module and the slave control module send the inspection triggering electrical signal at different times.

4. The valve control device according to claim 3, characterized in that: The control unit in the main control module is further configured to generate an alarm message when the inspection result indicates that one of the optical channels is abnormal; The main control module is further configured to generate the alarm information and shut down the valve control function of the main control module when the inspection results of the optical channels in the main control module are all abnormal.

5. The valve control device according to any one of claims 1 to 4, characterized in that: The control module is further configured to record the inspection identification of the optical channel corresponding to the target transmitting unit; the target transmitting unit refers to the transmitting unit to which the control module currently sends the trigger inspection electrical signal.

6. The valve control device according to claim 1, characterized in that: The control unit is further configured to receive a modulation signal sent by the DC transmission system, determine whether the modulation signal satisfies a preset inspection condition, and generate a corresponding determination result. If the determination result indicates that an inspection is to be initiated, the control unit transmits a trigger inspection electrical signal to each of the transmitting units in a time-sharing manner according to a trigger instruction sent by the DC transmission system.

7. The valve control device according to claim 6, characterized in that: The modulation signal includes an AC voltage signal, an operation status signal and a bypass pair status signal; The control unit is also used to determine that the judgment result is to start the inspection when the frequency of the bypass pair status signal is a first preset value and the frequency of the AC voltage signal is a second preset value, or when the frequency of the bypass pair status signal is a first preset value, the frequency of the AC voltage signal is a third preset value, and the frequency of the operating status signal is a fourth preset value.

8. An optical channel patrol detection method, characterized in that: Applied to the valve control device according to any one of claims 1 to 7, the method comprises: When the preset inspection conditions are met, the control unit sends a trigger inspection electrical signal to each transmitting unit in a time-sharing manner according to the trigger instruction sent by the DC transmission system; The trigger inspection electrical signal is converted into a trigger inspection optical signal by each of the transmitting units, and the trigger inspection optical signal is sent to the converter valve via a preset optical channel, thereby instructing the converter valve to send a return inspection optical signal to the receiving unit; different optical channels are used between different transmitting units and the converter valve; converting the received return detection optical signal into a return detection electrical signal by the receiving unit, and sending the return detection electrical signal to the control unit; The control unit determines the inspection result of each optical channel according to the return inspection optical signal and each trigger inspection electrical signal.

9. A converter valve control system, characterized in that: It comprises a converter valve and a valve control device as claimed in any one of claims 1 to 8.

10. The converter valve control system according to claim 9, characterized in that: The converter valve includes a trigger electronic board and a thyristor; The trigger electronic board is respectively connected to the thyristor, the transmitting unit in the valve control device, and the receiving unit; The transmitting unit is further used to send a trigger light signal to the trigger electronic board; The trigger electronic board is used to convert the trigger light signal into a conduction electrical signal, and transmit the conduction electrical signal to the thyristor to turn on the thyristor.

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