A control pulse coding method and device for a controllable commutator valve control system

Abstract

The present invention relates to the field of direct current transmission technology, and specifically provides a control pulse encoding method and device for a controllable phase-commutation converter valve control system, including: obtaining trigger control timing information of a controllable phase-commutation converter; generating trigger signals of various components of the controllable phase-commutation converter based on the trigger control timing information; encoding the trigger signals of various components of the controllable phase-commutation converter based on the types of various components of the controllable phase-commutation converter; wherein the types of components include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT. The technical solution provided by the present invention can realize synchronous trigger control of multi-stage thyristors and fully controlled power devices of a controllable phase-commutation converter valve.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current transmission, and in particular to a control pulse encoding method and device for a controllable phase-changing converter valve control system. Background Art

[0002] At present, line commutated converterbased high voltage direct current (LCC-HVDC) has the advantages of large transmission capacity, long distance, high efficiency, low loss and small footprint, and has been widely used around the world. Due to the small area and high load density of a certain regional power grid, a large receiving-end power grid interconnected by AC and DC is formed, which has the risk of multiple DC continuous commutation failures and lockouts. With the access of new DC, the proportion of local renewable energy will continue to increase, the inertia and anti-disturbance capabilities of the AC system will further decrease, and the power grid will face greater system risks.

[0003] In order to solve the problem of continuous locking of multi-infeed DC systems, fundamentally eliminate the long-term threat of commutation failure, continuously improve the AC fault ride-through capability of DC transmission systems and the reactive voltage support capability of AC systems, and reduce the risk of commutation failure, the primary goal is to reduce the risk of commutation failure. The controllable line commutated converter (CLCC) maintains the 6-pulse bridge structure of the traditional line commutated converter (LCC), and reconstructs the commutation valves that constitute each bridge arm based on the idea of ​​half-controlled thyristor devices and fully controlled IGBT devices to form a hybrid converter. This converter makes full use of the technical characteristics of thyristor devices with large capacity, low loss and strong IGBT turn-off capability, taking advantage of their strengths and making up for their weaknesses. It not only inherits the advantages of good economy of traditional LCC converters, but also fundamentally avoids the occurrence of commutation failure.

[0004] The controllable phase-commutation converter valve is based on the design concept of hybrid connection of full-controlled and semi-controlled devices. First, the current is transferred through the fully controlled device, and after the thyristor shutdown capability is restored, the fully controlled device is used to shut down the current to quickly complete the phase change between the bridge arms. The controllable grid phase-commutation converter mainly includes two operating modes: conventional commutation and controllable commutation. When an AC fault occurs, the controllable grid phase-commutation converter can actively shut down the bridge arm current to achieve forced commutation, while providing a certain amount of reactive power support, which completely solves the problem of phase-commutation failure in multi-input DC systems, which is conducive to improving the safe and stable operation level of the power grid and improving the power acceptance capacity of the multi-DC feed-in receiving end power grid.

[0005] Valve base electronics (VBE), also known as valve control system, is the "brain" of the converter valve and plays a key role in the AC / DC power conversion function of the converter valve. The valve control system is the intermediate link between the upper control and protection system and the lower thyristor and IGBT valve. By receiving the control command of the upper control and protection system, it realizes the synchronous triggering of multi-level thyristors and IGBTs, and monitors each thyristor and IGBT level in the converter valve in real time to realize the control and protection strategy of the converter valve. Its reliability directly affects the safe and stable operation of the converter valve and even the entire DC transmission project. However, in the previous LCC system, VBE only controls the triggering of thyristors. In the CLCC topology, VBE requires the synchronous triggering of thyristors and IGBTs under operating conditions with many control and protection objects and high synchronization requirements, which can realize both LCC mode control and CLCC mode control. The valve control system (VBE) of the controllable phase-commutated converter valve is responsible for the triggering and monitoring of all thyristors and IGBTs in the CLCC converter valve. Therefore, the conventional VBE control pulse coding method can no longer meet the control and protection requirements of the controllable phase-commutated converter valve. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the present invention proposes a control pulse encoding method and device for a controllable phase-changing valve control system.

[0007] In a first aspect, a control pulse encoding method of a controllable phase-commutation valve control system is provided, wherein the control pulse encoding method of the controllable phase-commutation valve control system comprises:

[0008] Acquiring trigger control timing information of a controllable commutation converter;

[0009] Generate a trigger signal for each device of the controllable commutation converter based on the trigger control timing information;

[0010] Encoding a trigger signal of each component of the controllable commutated converter based on the type of each component of the controllable commutated converter;

[0011] The device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT.

[0012] Preferably, the generating of the trigger signal of each device of the controllable commutation converter based on the trigger control timing information includes:

[0013] When the main branch thyristor is in the on state in the trigger control timing information, an optical modulation signal of a first preset frequency is generated, and when the main branch thyristor is in the off state in the trigger control timing information, no optical modulation signal is generated;

[0014] When the main branch IGBT is in the on state in the trigger control timing information, a light modulation signal of a second preset frequency is generated; when the main branch IGBT is in the off state in the trigger control timing information, a light modulation signal of a first preset frequency is generated;

[0015] When the auxiliary branch thyristor in the trigger control timing information is in the on state, a light modulation signal of a second preset frequency is generated; when the auxiliary branch thyristor in the trigger control timing information is in the off state, a light modulation signal of a first preset frequency is generated;

[0016] When the auxiliary branch IGBT in the trigger control timing information is in the on state, an optical modulation signal of a second preset frequency is generated; when the auxiliary branch IGBT in the trigger control timing information is in the off state, an optical modulation signal of a first preset frequency is generated.

[0017] Furthermore, the optical modulation signal is generated by optical modulation.

[0018] Furthermore, the first preset frequency is 1 MHz, and the second preset frequency is 10 MHz.

[0019] Preferably, encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter includes:

[0020] For the main branch thyristors, encoding is performed in the form of optical pulses;

[0021] For the main branch IGBT, optical communication coding is used for encoding;

[0022] For the auxiliary branch thyristors, encoding is performed in the form of optical pulses;

[0023] For the auxiliary branch IGBT, optical communication coding is used for encoding.

[0024] Preferably, two downstream communication optical fibers and one upstream communication optical fiber are added between the pole control system and the valve control system.

[0025] Furthermore, one of the two downstream communication optical fibers is used to send a converter valve operation mode permission position signal and a trigger delay angle signal in a high-voltage direct current transmission technology to the valve control system, and the other downstream communication optical fiber is used to send a no-load pressurization signal to the valve control system;

[0026] The 1 uplink communication optical fiber is used to report the working mode of the converter valve to the pole controller.

[0027] Further, one of the two downstream communication optical fibers adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs;

[0028] The other one of the two downstream communication optical fibers adopts an optical modulation signal, 1MHz represents a no-load pressurization mode, and 10kHz represents a non-no-load pressurization mode;

[0029] The one uplink communication optical fiber adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs.

[0030] Furthermore, the converter valve operation modes include: LCC operation mode and CLCC operation mode.

[0031] In a second aspect, a control pulse encoding device of a controllable phase-changing valve control system is provided, wherein the control pulse encoding device of the controllable phase-changing valve control system comprises:

[0032] An acquisition module, used for acquiring trigger control timing information of a controllable commutation converter;

[0033] A generating module, used for generating a trigger signal of each device of the controllable commutation converter based on the trigger control timing information;

[0034] An encoding module, used for encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter;

[0035] The device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT.

[0036] In a third aspect, a computer device is provided, comprising: one or more processors;

[0037] The processor is configured to execute one or more programs;

[0038] When the one or more programs are executed by the one or more processors, the control pulse encoding method of the controllable phase-commutating valve control system is implemented.

[0039] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, the control pulse encoding method of the controllable phase-changing valve control system is implemented.

[0040] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0041] The present invention provides a control pulse encoding method and device for a controllable phase-commutation converter valve control system, including: obtaining trigger control timing information of a controllable phase-commutation converter; generating trigger signals of various devices of the controllable phase-commutation converter based on the trigger control timing information; encoding the trigger signals of various devices of the controllable phase-commutation converter based on the types of various devices of the controllable phase-commutation converter; wherein the device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT. The technical solution provided by the present invention can realize synchronous trigger control of multi-stage thyristors and fully controlled power devices of a controllable phase-commutation converter valve, can effectively support the operation of a controllable phase-commutation converter valve, and is also widely applicable to converter valve structures of different topologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a schematic flow chart of the main steps of a control pulse encoding method of a controllable phase-commutation valve control system according to an embodiment of the present invention;

[0043] Figure 2 Schematic diagram of the main structure of the valve control system of the embodiment of the present invention;

[0044] Figure 3 It is an interface signal diagram between the valve control system and the pole control of an embodiment of the present invention;

[0045] Figure 4 It is a flow chart of trigger signal generation of various components of the controllable commutation converter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] As disclosed in the background technology, at present, the line commutated converter based high voltage direct current (LCC-HVDC) has the advantages of large transmission capacity, long distance, high efficiency, low loss and small footprint, and has been widely used worldwide. Due to the small area and high load density of a certain regional power grid, a large receiving-end power grid interconnected by AC and DC is formed, and there is a risk of multiple DC continuous commutation failures and lockouts. With the access of new DC, the proportion of local new energy will continue to increase, and the inertia and anti-disturbance capabilities of the AC system will further decrease, and the power grid will face greater system risks.

[0049] In order to solve the problem of continuous locking of multi-infeed DC systems, fundamentally eliminate the long-term threat of commutation failure, continuously improve the AC fault ride-through capability of DC transmission systems and the reactive voltage support capability of AC systems, and reduce the risk of commutation failure, the primary goal is to reduce the risk of commutation failure. The controllable line commutated converter (CLCC) maintains the 6-pulse bridge structure of the traditional line commutated converter (LCC), and reconstructs the commutation valves that constitute each bridge arm based on the idea of ​​half-controlled thyristor devices and fully controlled IGBT devices to form a hybrid converter. This converter makes full use of the technical characteristics of thyristor devices with large capacity, low loss and strong IGBT turn-off capability, taking advantage of their strengths and making up for their weaknesses. It not only inherits the advantages of good economy of traditional LCC converters, but also fundamentally avoids the occurrence of commutation failure.

[0050] The controllable phase-commutation converter valve is based on the design concept of hybrid connection of full-controlled and semi-controlled devices. First, the current is transferred through the fully controlled device, and after the thyristor shutdown capability is restored, the fully controlled device is used to shut down the current to quickly complete the phase change between the bridge arms. The controllable grid phase-commutation converter mainly includes two operating modes: conventional commutation and controllable commutation. When an AC fault occurs, the controllable grid phase-commutation converter can actively shut down the bridge arm current to achieve forced commutation, while providing a certain amount of reactive power support, which completely solves the problem of phase-commutation failure in multi-input DC systems, which is conducive to improving the safe and stable operation level of the power grid and improving the power acceptance capacity of the multi-DC feed-in receiving end power grid.

[0051] Valve base electronics (VBE), also known as valve control system, is the "brain" of the converter valve and plays a key role in the AC / DC power conversion function of the converter valve. The valve control system is the intermediate link between the upper control and protection system and the lower thyristor and IGBT valve. By receiving the control command of the upper control and protection system, it realizes the synchronous triggering of multi-level thyristors and IGBTs, and monitors each thyristor and IGBT level in the converter valve in real time to realize the control and protection strategy of the converter valve. Its reliability directly affects the safe and stable operation of the converter valve and even the entire DC transmission project. However, in the previous LCC system, VBE only controls the triggering of thyristors. In the CLCC topology, VBE requires the synchronous triggering of thyristors and IGBTs under operating conditions with many control and protection objects and high synchronization requirements, which can realize both LCC mode control and CLCC mode control. The valve control system (VBE) of the controllable phase-commutated converter valve is responsible for the triggering and monitoring of all thyristors and IGBTs in the CLCC converter valve. Therefore, the conventional VBE control pulse coding method can no longer meet the control and protection requirements of the controllable phase-commutated converter valve.

[0052] In order to improve the above problems, the present invention provides a control pulse encoding method and device for a controllable phase-commutation converter valve control system, including: obtaining the trigger control timing information of the controllable phase-commutation converter; generating the trigger signal of each device of the controllable phase-commutation converter based on the trigger control timing information; encoding the trigger signal of each device of the controllable phase-commutation converter based on the device type of the controllable phase-commutation converter; wherein the device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT. The technical solution provided by the present invention can realize the synchronous trigger control of the multi-stage thyristor and the fully controlled power device of the controllable phase-commutation converter valve, can effectively support the operation of the controllable phase-commutation converter valve, and is also widely applicable to the converter valve structure of different topologies.

[0053] The above scheme is described in detail below.

[0054] Example 1

[0055] See attached Figure 1 , Figure 1 FIG. 1 is a flow chart showing the main steps of a control pulse encoding method for a controllable phase-commutation valve control system according to an embodiment of the present invention. Figure 1 As shown, the control pulse encoding method of the controllable phase-commutation valve control system in the embodiment of the present invention mainly includes the following steps:

[0056] Step S101: Acquire trigger control timing information of a controllable commutation converter;

[0057] Step S102: generating a trigger signal for each device of the controllable commutation converter based on the trigger control timing information;

[0058] Step S103: encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter;

[0059] The device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT.

[0060] Conventional valve control systems such as Figure 2 As shown, including:

[0061] CCP: Control and protection device for two series-connected converters per pole in UHV DC projects, including an interface for signal acquisition and command issuance.

[0062] Centralized control unit: used to send the control instructions related to the controllable commutation function issued by the CCP to the trigger monitoring unit.

[0063] Trigger monitoring unit: Based on the control instructions, it controls the on and off of the thyristors and fully controlled power devices on the main branch and auxiliary branch of the controllable commutation valve to achieve natural commutation or forced commutation.

[0064] Collection unit: used to collect the AC side system voltage and the secondary side current of the converter transformer, and send the collected data to the centralized control unit after aggregation and processing.

[0065] Recording unit: used for automatic recording, timed recording and fault recording.

[0066] Its main functions include:

[0067] 1) Communication with DC control and protection device: After receiving the CP (Control Pulse) signal from the DC control and protection system and sending it to the converter valve, VBE feeds back the FP (Feedback Pulse) signal to the pole control system CCP as a detection signal for the pole control system to judge valve mis-triggering and pulse loss. When it is judged that the valve margin exceeds the limit, VBE sends a trip request to the DC control and protection system.

[0068] 2) Communicate with the high-voltage trigger monitoring board: The VBE device triggers and monitors each high-voltage trigger detection board through optical fiber. According to the feedback signal of each TTM (thyristor triggering and monitoring unit) of the converter valve, it determines whether the TTM working power supply is normal, whether the thyristor stage is subjected to forward voltage, and whether the thyristor overvoltage protection is activated. These signals are aggregated and processed, and uploaded to SCADA (Supervisory Control And Data Acquisition) through the bus.

[0069] 3) Thyristor valve protection: VBE takes comprehensive protection measures for thyristor valves according to the monitoring information returned by TTM. When the converter valve trips due to fault, VBE sends a request trip signal. When the pole control system receives the VBE master system trip, it switches the VBE system. If it detects that the slave system also trips, it trips. If the VBE single system is running and a trip is requested, it will trip.

[0070] 4) VBE self-test protection: VBE has a complete self-test function. The VBE self-test content includes the optical channel sent from the pole control system to VBE, the communication system between VBE and TTM, the internal interconnection system of the VBE cabinet, and each circuit board of VBE (including the control board and the power board). VBE self-test protection is divided into two levels: the first is that the fault that does not affect the operation of the converter valve only uploads the fault type and location to the SCADA system through the bus; the second is that the fault that affects the operation of the converter valve is uploaded to the pole control system through the VBE_OK (VBE available signal) optical cable, and the fault type and location are uploaded to the SCADA system through the bus; the pole control system determines the A and B master and slave systems according to the VBE status uploaded by the VBE_OK optical cable. When the VBE dual system is running, if the VBE_OK optical cable of the master system sends a VBE_OK signal, the pole control system switches from master to slave; if the VBE_OK optical cable of the slave system sends a VBE_OK signal, the master system is still maintained, and the slave system VBE cannot continue to be used. When the VBE single system is running, the VBE_OK optical cable of the system sends the VBE_OK signal, and the pole control system locks the converter valve. VBE uploads the fault type and location to the SCADA system through the bus.

[0071] 5) Lightning arrester protection: VBE is connected to each valve lightning arrester by optical fiber. The optical pulse signal generated when the lightning arrester is activated is sent to the lightning arrester monitor in the VBE cabinet through optical fiber, and the number of lightning arrester actions is uploaded to the SCADA system through the bus.

[0072] 6) Valve tower leakage protection: The leakage detector and VBE leakage monitor installed at the bottom of the valve tower jointly complete the monitoring of valve tower leakage. The VBE leakage monitor sends a certain frequency of light pulses to the leakage detector in real time. When the valve tower is not leaking, the light path of the leakage detector is unobstructed, and the light pulses sent are returned to the VBE leakage monitor. When the valve tower is leaking, the light path of the leakage detector is blocked, and the light pulses sent cannot return to the VBE leakage monitor, which is counted as a leakage. The number of light pulses that cannot be returned is recorded within a certain period of time to determine the level of leakage. The valve tower leakage alarm is uploaded to the SCADA system through the bus.

[0073] 7) VBE recording function: VBE recording function is divided into automatic recording and manual recording, which is completed by VBE recording chassis. It can realize real-time recording of various signals and is used to test the feedback signal of high-voltage trigger monitoring board and the interface signal of VBE and pole control system.

[0074] However, VBE directly forwards and executes the control pulse (CP) sent by CCP, which cannot realize the synchronous triggering control of the multi-stage thyristor of the controllable phase-commutated converter valve and the fully controlled power device IGBT. Therefore, for the above functions, the technical solution provided by the present invention can also generate the trigger signal of each device of the controllable phase-commutated converter based on the trigger control timing information, specifically including:

[0075] When the main branch thyristor is in the on state in the trigger control timing information, an optical modulation signal of a first preset frequency is generated, and when the main branch thyristor is in the off state in the trigger control timing information, no optical modulation signal is generated;

[0076] When the main branch IGBT is in the on state in the trigger control timing information, a light modulation signal of a second preset frequency is generated; when the main branch IGBT is in the off state in the trigger control timing information, a light modulation signal of a first preset frequency is generated;

[0077] When the auxiliary branch thyristor in the trigger control timing information is in the on state, a light modulation signal of a second preset frequency is generated; when the auxiliary branch thyristor in the trigger control timing information is in the off state, a light modulation signal of a first preset frequency is generated;

[0078] When the auxiliary branch IGBT in the trigger control timing information is in the on state, an optical modulation signal of a second preset frequency is generated; when the auxiliary branch IGBT in the trigger control timing information is in the off state, an optical modulation signal of a first preset frequency is generated.

[0079] In one embodiment, the optical modulation signal is generated by optical modulation.

[0080] In one embodiment, the first preset frequency is 1 MHz, and the second preset frequency is 10 MHz.

[0081] In a specific embodiment, Figure 3 As shown in the figure, according to the general secondary interface specification requirements of the UHV DC project converter station equipment, the CCP sends a trigger signal to the VBE converter valve, and each converter has 12 CP signals. That is, the centralized control unit in the VBE that is directly connected to the CCP only receives the control pulse signals of 12 bridge arms. However, since each bridge arm of the controllable phase-changing converter valve is composed of a main branch and an auxiliary branch in parallel, and both the main branch and the auxiliary branch include multi-stage thyristor stages and fully controlled power devices IGBT, the above components need to be synchronously triggered, controlled, reported, and protected from faults to support the operation of the controllable phase-changing converter valve. Therefore, for the 12 control pulse signals (CP) sent by the CCP, control pulse encoding needs to be performed inside the VBE, and each CP signal is divided into CP11, CP12, CP13, and CP14, which trigger and control the main branch thyristor valve, the main branch IGBT valve, the auxiliary branch IGBT valve, and the auxiliary branch thyristor valve, respectively.

[0082] In this embodiment, encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter includes:

[0083] For the main branch thyristors, encoding is performed in the form of optical pulses;

[0084] For the main branch IGBT, optical communication coding is used for encoding;

[0085] For the auxiliary branch thyristors, encoding is performed in the form of optical pulses;

[0086] For the auxiliary branch IGBT, optical communication coding is used for encoding.

[0087] In this embodiment, two downlink communication optical fibers and one uplink communication optical fiber are added between the pole control and the valve control system. Figure 4 shown.

[0088] In one embodiment, one of the two downstream communication optical fibers is used to send a converter valve operation mode permission signal and a trigger delay angle signal in a high-voltage direct current transmission technology to the valve control system, and the other downstream communication optical fiber is used to send a no-load pressurization signal (OLT) to the valve control system;

[0089] The 1 uplink communication optical fiber is used to report the working mode of the converter valve to the pole controller.

[0090] In one embodiment, one of the two downstream communication optical fibers adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs;

[0091] The other one of the two downstream communication optical fibers adopts an optical modulation signal, 1MHz represents a no-load pressurization mode, and 10kHz represents a non-no-load pressurization mode;

[0092] The one uplink communication optical fiber adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs.

[0093] In one embodiment, the converter valve operation mode includes: an LCC operation mode and a CLCC operation mode.

[0094] Example 2

[0095] Based on the same inventive concept, the present invention also provides a control pulse encoding device of a controllable phase-changing valve control system, and the control pulse encoding device of the controllable phase-changing valve control system comprises:

[0096] An acquisition module, used for acquiring trigger control timing information of a controllable commutation converter;

[0097] A generating module, used for generating a trigger signal of each device of the controllable commutation converter based on the trigger control timing information;

[0098] An encoding module, used for encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter;

[0099] The device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT.

[0100] Preferably, the generating of the trigger signal of each device of the controllable commutation converter based on the trigger control timing information includes:

[0101] When the main branch thyristor is in the on state in the trigger control timing information, an optical modulation signal of a first preset frequency is generated, and when the main branch thyristor is in the off state in the trigger control timing information, no optical modulation signal is generated;

[0102] When the main branch IGBT is in the on state in the trigger control timing information, a light modulation signal of a second preset frequency is generated; when the main branch IGBT is in the off state in the trigger control timing information, a light modulation signal of a first preset frequency is generated;

[0103] When the auxiliary branch thyristor in the trigger control timing information is in the on state, a light modulation signal of a second preset frequency is generated; when the auxiliary branch thyristor in the trigger control timing information is in the off state, a light modulation signal of a first preset frequency is generated;

[0104] When the auxiliary branch IGBT in the trigger control timing information is in the on state, an optical modulation signal of a second preset frequency is generated; when the auxiliary branch IGBT in the trigger control timing information is in the off state, an optical modulation signal of a first preset frequency is generated.

[0105] Furthermore, the optical modulation signal is generated by optical modulation.

[0106] Furthermore, the first preset frequency is 1 MHz, and the second preset frequency is 10 MHz.

[0107] Preferably, encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter includes:

[0108] For the main branch thyristors, encoding is performed in the form of optical pulses;

[0109] For the main branch IGBT, optical communication coding is used for encoding;

[0110] For the auxiliary branch thyristors, encoding is performed in the form of optical pulses;

[0111] For the auxiliary branch IGBT, optical communication coding is used for encoding.

[0112] Preferably, two downstream communication optical fibers and one upstream communication optical fiber are added between the pole control system and the valve control system.

[0113] Furthermore, one of the two downstream communication optical fibers is used to send a converter valve operation mode permission position signal and a trigger delay angle signal in a high-voltage direct current transmission technology to the valve control system, and the other downstream communication optical fiber is used to send a no-load pressurization signal to the valve control system;

[0114] The 1 uplink communication optical fiber is used to report the working mode of the converter valve to the pole controller.

[0115] Further, one of the two downstream communication optical fibers adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs;

[0116] The other one of the two downstream communication optical fibers adopts an optical modulation signal, 1MHz represents a no-load pressurization mode, and 10kHz represents a non-no-load pressurization mode;

[0117] The one uplink communication optical fiber adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs.

[0118] Furthermore, the converter valve operation modes include: LCC operation mode and CLCC operation mode.

[0119] Example 3

[0120] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the control pulse encoding method of a controllable phase-changing valve control system in the above embodiment.

[0121] Example 4

[0122] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a control pulse encoding method of a controllable phase-commutated valve control system in the above embodiment.

[0123] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0124] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0125] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0126] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control pulse encoding method for a controllable phase-commutation valve control system, characterized in that: The method comprises: Acquiring trigger control timing information of a controllable commutation converter; Generate a trigger signal for each device of the controllable commutation converter based on the trigger control timing information; Encoding a trigger signal of each component of the controllable commutated converter based on the type of each component of the controllable commutated converter; Wherein, the device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT; The generating of the trigger signal of each device of the controllable commutation converter based on the trigger control timing information comprises: When the main branch thyristor is in the on state in the trigger control timing information, an optical modulation signal of a first preset frequency is generated, and when the main branch thyristor is in the off state in the trigger control timing information, no optical modulation signal is generated; When the main branch IGBT is in the on state in the trigger control timing information, a light modulation signal of a second preset frequency is generated; when the main branch IGBT is in the off state in the trigger control timing information, a light modulation signal of a first preset frequency is generated; When the auxiliary branch thyristor in the trigger control timing information is in the on state, a light modulation signal of a second preset frequency is generated; when the auxiliary branch thyristor in the trigger control timing information is in the off state, a light modulation signal of a first preset frequency is generated; When the auxiliary branch IGBT in the trigger control timing information is in the on state, an optical modulation signal of a second preset frequency is generated; when the auxiliary branch IGBT in the trigger control timing information is in the off state, an optical modulation signal of a first preset frequency is generated.

2. The method according to claim 1, characterized in that The optical modulation signal is generated by optical modulation.

3. The method according to claim 1, characterized in that The first preset frequency is 1 MHz, and the second preset frequency is 10 MHz.

4. The method according to claim 1, characterized in that The step of encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter comprises: For the main branch thyristors, encoding is performed in the form of optical pulses; For the main branch IGBT, optical communication coding is used for encoding; For the auxiliary branch thyristors, encoding is performed in the form of optical pulses; For the auxiliary branch IGBT, optical communication coding is used for encoding.

5. The method according to claim 1, characterized in that Two downstream communication optical fibers and one upstream communication optical fiber are newly added between the pole control and the valve control system.

6. The method according to claim 5, characterized in that One of the two downstream communication optical fibers is used to send a converter valve operation mode permission position signal and a trigger delay angle signal in high-voltage direct current transmission technology to the valve control system, and the other downstream communication optical fiber is used to send a no-load pressurization signal to the valve control system; The 1 uplink communication optical fiber is used to report the working mode of the converter valve to the pole controller.

7. The method according to claim 6, characterized in that One of the two downstream communication optical fibers adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs; The other one of the two downstream communication optical fibers adopts an optical modulation signal, 1MHz represents a no-load pressurization mode, and 10kHz represents a non-no-load pressurization mode; The one uplink communication optical fiber adopts the IEC60044-8 communication protocol, with a communication rate of 10 Mbps, 1 Block, and a communication cycle of 100 μs.

8. The method according to claim 6, characterized in that The converter valve operation modes include: LCC operation mode and CLCC operation mode.

9. A device for controlling pulse encoding method of a controllable phase-commutation valve control system according to any one of claims 1 to 8, characterized in that: The device comprises: An acquisition module, used for acquiring trigger control timing information of a controllable commutation converter; A generating module, used for generating a trigger signal of each device of the controllable commutation converter based on the trigger control timing information; An encoding module, used for encoding the trigger signal of each component of the controllable commutation converter based on the type of each component of the controllable commutation converter; The device types include: main branch thyristor, main branch IGBT, auxiliary branch thyristor and auxiliary branch IGBT.

10. A computer device, characterized in that: include: one or more processors; The processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the control pulse encoding method of the controllable phase-commutated converter valve control system as described in any one of claims 1 to 8 is implemented.

11. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the control pulse encoding method of the controllable phase-changing valve control system as described in any one of claims 1 to 8 is implemented.

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