A topological structure of a controllable phase-changing valve control system and its operation method

Abstract

The present invention relates to the technical field of ultra-high voltage direct current transmission, and specifically provides a topological structure of a controllable phase-changing commutation valve control system and an operation method thereof, including: the topological structure includes: a main branch trigger monitoring chassis and an auxiliary branch trigger monitoring chassis; the main branch trigger monitoring chassis is used to complete optical signal interaction with the main branch of CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis; the auxiliary branch trigger monitoring chassis is used to complete optical signal interaction with the auxiliary branch of CLCC based on the trigger signal corresponding to the auxiliary branch. The technical solution provided by the present invention realizes the synchronous triggering and time-sharing shutdown functions of thyristors and IGBTs, and is compatible with the valve control systems of LCC and CLCC.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high voltage direct current transmission, and in particular to a topological structure of a controllable phase-changing converter valve control system and an operation method thereof. Background Art

[0002] With the large-scale grid connection of new energy and the access of interactive devices such as electric vehicles and distributed energy, the power system will feature a high proportion of new energy and a high proportion of power electronics. The frequency regulation capability of the system will be significantly reduced and the anti-disturbance capability will be further weakened. At the same time, due to the gradual increase in UHV DC projects, the DC landing points will become more dense.

[0003] At present, multiple DC transmission and receiving end groups with dense landing points have been formed. The continued growth of the number of UHV DC landing points has formed a more dense multi-feed DC system for the power grid, the coupling between stations is closer, and the multi-station chain commutation failure fault will be more serious. By then, the impact intensity and impact range of multiple DC commutation failures will be greater, and the safe and stable operation of large cross-regional power grids will face severe challenges. Commutation failures urgently need a more thorough solution.

[0004] In order to maintain the advantages of low loss, high reliability and economy of traditional line commutated converter (LCC) while avoiding the risk of commutation failure, a new type of controllable line commutated converter (CLCC) topology with controllable shutdown capability is proposed. Since its advent, high-voltage direct current technology based on CLCC has rapidly attracted widespread attention.

[0005] The valve control system (VBE) is the core control device for the converter valve to achieve AC-DC power conversion. Its basic function is to control and protect the converter valve. At the same time, the VBE itself should have a complete self-test function. VBE is the lowest-level control and protection device of the converter valve. Its operating reliability directly affects the operating stability of the entire DC transmission line. The complexity of the operation of the DC transmission converter valve determines the difficulty of VBE design.

[0006] In the previous LCC system, the valve control system only controls the triggering of thyristors. In the CLCC topology, the valve control system cannot achieve synchronous triggering of thyristors and IGBTs under operating conditions with many control and protection objects and high synchronization requirements. Summary of the invention

[0007] In order to overcome the above-mentioned defects, the present invention proposes a topological structure of a controllable phase-changing valve control system and an operation method thereof.

[0008] In a first aspect, a topology structure of a controllable phase-changing valve control system is provided, wherein the topology structure of the valve control system comprises:

[0009] Main branch trigger monitoring chassis and auxiliary branch trigger monitoring chassis;

[0010] The main branch trigger monitoring chassis is used to complete the optical signal interaction for the main branch of the CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis;

[0011] The auxiliary branch trigger monitoring chassis is used to complete the optical signal interaction for the auxiliary branch of the CLCC based on the received trigger signal corresponding to the auxiliary branch.

[0012] Preferably, the main branch trigger monitoring chassis comprises: a first main control board, a plurality of first trigger monitoring boards and a first power supply board;

[0013] The first main control board is used to complete status reporting and analog instruction sending according to the HDLC protocol through a pair of transceiver optical fibers and a protocol conversion device;

[0014] The first trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT;

[0015] The first power supply board is used to supply power to the main branch trigger monitoring chassis.

[0016] Furthermore, the number of the plurality of first trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the main branch of the CLCC.

[0017] Furthermore, each first trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT. Each first trigger monitoring board triggers and reports the thyristor by encoding through sending and receiving two optical fibers, or triggers and collects the status of the IGBT by sending and receiving two optical fibers using Manchester code communication.

[0018] Preferably, the auxiliary branch trigger monitoring chassis comprises: a second main control board, a plurality of second trigger monitoring boards and a second power supply board;

[0019] The second main control board is used to send the received trigger signal to the second trigger monitoring board through the backplane;

[0020] The second trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT;

[0021] The second power supply board is used to supply power to the auxiliary branch trigger monitoring chassis.

[0022] Furthermore, the number of the plurality of second trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the auxiliary branches of the CLCC.

[0023] Furthermore, each second trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT. Each second trigger monitoring board triggers and reports the thyristor by encoding through sending and receiving two optical fibers, or triggers and collects the status of the IGBT by sending and receiving two optical fibers using Manchester code communication.

[0024] Preferably, the topological structure includes: a communication control chassis, a collection chassis and a recording chassis;

[0025] The communication control chassis is used to exchange information with the pole control system and send the received trigger signal to the main branch trigger monitoring chassis;

[0026] The acquisition chassis is used to collect AC voltage and current;

[0027] The recording box is used for recording on-site signals.

[0028] Preferably, the topology structure includes: a receiving optical fiber for receiving a trigger angle / commutation gear position signal sent by the pole control and a sending optical fiber for informing the pole control of the operating mode of the current topology structure of the valve control system.

[0029] Furthermore, the operation modes include: LCC operation mode and CLCC operation mode.

[0030] In a second aspect, an operation method based on the topological structure of the controllable phase-changing valve control system is provided, the method comprising:

[0031] When the CLCC is in rectification operation or inverter operation and does not need to resist commutation failure, the topology structure of the valve control system controls the IGBT of the main branch of the CLCC to be locked, controls the bypass thyristor valve in parallel with the IGBT to be triggered and turned on, controls the thyristor of the main branch to be triggered and turned on, and controls the thyristor and IGBT in the auxiliary branch of the CLCC to be locked.

[0032] Preferably, the triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch is obtained by inversely calculating the following formula:

[0033] 200A=I d -E*[cosα- cos(α+wt)] / (2 1 / 2 X u )

[0034] In the above formula, A is the unit of current, I dis the DC current, E is the bridge arm voltage, α is the current angle at the current moment, w is the current angular velocity at the current moment, t is the triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch, X u is the virtual impedance of the bridge arm.

[0035] In a third aspect, an operation method based on the topological structure of the controllable phase-changing valve control system is provided, the method comprising:

[0036] When the IGBT of the main branch and the auxiliary branch of CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and no AC fault occurs in CLCC, for a single valve in the on state, when the switching current of the single valve is less than the set value, the IGBT in the main branch of the single valve is turned off, the thyristor and IGBT in the auxiliary branch are turned on, and the IGBT in the auxiliary branch is turned off after a preset time delay.

[0037] In a fourth aspect, an operation method based on the topological structure of the controllable phase-changing valve control system is provided, the method comprising:

[0038] When the IGBT of the main branch and the auxiliary branch of the CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and an AC fault occurs in the CLCC, the IGBT of the main branch is turned off, and the thyristor and IGBT in the auxiliary branch are turned on. After the thyristor of the main branch is restored, the IGBT of the auxiliary branch is turned off.

[0039] In a fifth aspect, a computer device is provided, comprising: one or more processors;

[0040] The processor is configured to execute one or more programs;

[0041] When the one or more programs are executed by the one or more processors, the operation method of the topological structure of the controllable phase-changing valve control system is implemented.

[0042] In a sixth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, an operating method of the topological structure of the controllable phase-changing valve control system is implemented.

[0043] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0044] The present invention provides a topological structure of a controllable phase-changing valve control system and an operation method thereof, including: the topological structure includes: a main branch trigger monitoring chassis and an auxiliary branch trigger monitoring chassis; the main branch trigger monitoring chassis is used to complete optical signal interaction with the main branch of CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis; the auxiliary branch trigger monitoring chassis is used to complete optical signal interaction with the auxiliary branch of CLCC based on the trigger signal corresponding to the received auxiliary branch. The technical solution provided by the present invention realizes the synchronous triggering and time-sharing shutdown functions of thyristors and IGBTs, is compatible with the valve control systems of LCC and CLCC, effectively solves the problem of phase-changing failure caused by the fault of the receiving end AC system, eliminates the threat of phase-changing failure to the safe and stable operation of the large power grid, reduces the shutdown and power outage losses caused by converter failures, and improves the safe and stable operation level of the large power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a topological structure block diagram of a controllable phase-changing valve control system according to an embodiment of the present invention;

[0046] Figure 2 is a block diagram of a CLCC topology structure according to an embodiment of the present invention;

[0047] Figure 3 It is a topological structure block diagram of the main branch trigger monitoring chassis of an embodiment of the present invention;

[0048] Figure 4 It is a topological structure block diagram of the auxiliary branch trigger monitoring chassis according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0050] 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.

[0051] As disclosed in the background technology, with the large-scale grid connection of new energy and the large-scale access of interactive devices such as electric vehicles and distributed energy, the power system will show the characteristics of a high proportion of new energy and a high proportion of power electronics, the system frequency regulation capability will be significantly reduced, and the anti-disturbance capability will be further weakened; at the same time, due to the gradual increase in UHV DC projects, the DC landing points will become more dense.

[0052] At present, multiple DC transmission and receiving end groups with dense landing points have been formed. The continued growth of the number of UHV DC landing points has formed a more dense multi-feed DC system for the power grid, the coupling between stations is closer, and the multi-station chain commutation failure fault will be more serious. By then, the impact intensity and impact range of multiple DC commutation failures will be greater, and the safe and stable operation of large cross-regional power grids will face severe challenges. Commutation failures urgently need a more thorough solution.

[0053] In order to maintain the advantages of low loss, high reliability and economy of traditional line commutated converter (LCC) while avoiding the risk of commutation failure, a new type of controllable line commutated converter (CLCC) topology with controllable shutdown capability is proposed. Since its advent, high-voltage direct current technology based on CLCC has rapidly attracted widespread attention.

[0054] The valve control system (VBE) is the core control device for the converter valve to achieve AC-DC power conversion. Its basic function is to control and protect the converter valve. At the same time, the VBE itself should have a complete self-test function. VBE is the lowest-level control and protection device of the converter valve. Its operating reliability directly affects the operating stability of the entire DC transmission line. The complexity of the operation of the DC transmission converter valve determines the difficulty of VBE design.

[0055] In the previous LCC system, the valve control system only controls the triggering of thyristors. In the CLCC topology, the valve control system cannot achieve synchronous triggering of thyristors and IGBTs under operating conditions with many control and protection objects and high synchronization requirements.

[0056] Specifically, the number of thyristors and IGBTs contained in a single converter valve varies according to the transmission capacity of the DC transmission project. The valve control system design needs to adapt to the different primary circuit configuration requirements of different projects. The 12-pulse converter in the current controllable phase-commutated DC converter station contains thousands of thyristors and IGBTs. The valve control system not only encodes the converter valve trigger control command sent by the DC station pole control system and sends it to each thyristor and IGBT on the valve side through optical fiber, but also needs to complete the real-time monitoring and fault location of the operating status of each thyristor and IGBT, and transmit it to the SCADA system after real-time summary. Since it is necessary to complete the reception, summary, judgment, and processing of various operating states of all device levels (including thyristors and IGBTs) in real time, the amount of information that the valve control system needs to process is huge.

[0057] During the normal operation of the converter valve, the triggering of all thyristors and IGBTs in each single valve must maintain a high degree of consistency. Inconsistent triggering time will directly lead to uneven voltage distribution of devices in the valve, increasing the risk of overvoltage breakdown of the device. The valve control system sends trigger code pulses to the single valves that need to be turned on among the 12 single valves at different times, and maintains the correctness and consistency of the trigger code pulses under system switching and other working conditions. The control and protection interface signals and converter valve trigger pulse code signals processed by the valve control system are required to be accurate in microseconds and have high real-time performance.

[0058] The valve control system of the UHV DC transmission project adopts a dual redundant design, which requires the redundant valve control system to have a high degree of operation process consistency and high-speed information exchange capabilities while completing a large amount of signal processing work.

[0059] In order to improve the above problems, the present invention provides a topological structure of a controllable phase-changing valve control system and its operation method, including: the topological structure includes: a main branch trigger monitoring chassis and an auxiliary branch trigger monitoring chassis; the main branch trigger monitoring chassis is used to complete the optical signal interaction with the main branch of CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis; the auxiliary branch trigger monitoring chassis is used to complete the optical signal interaction with the auxiliary branch of CLCC based on the trigger signal corresponding to the auxiliary branch. The technical solution provided by the present invention realizes the synchronous triggering and time-sharing shutdown functions of thyristors and IGBTs, is compatible with the valve control systems of LCC and CLCC, effectively solves the problem of phase-changing failure caused by the fault of the receiving end AC system, eliminates the threat of phase-changing failure to the safe and stable operation of the large power grid, reduces the shutdown and power outage losses caused by converter failures, and improves the safe and stable operation level of the large power grid.

[0060] The above scheme is described in detail below.

[0061] Example 1

[0062] See attached Figure 1 , Figure 1 FIG. 1 is a topological structure block diagram of a valve control system according to an embodiment of the present invention. Figure 1 As shown, the topological structure of the controllable phase-changing valve control system in the embodiment of the present invention mainly includes: a main branch trigger monitoring chassis and an auxiliary branch trigger monitoring chassis;

[0063] The main branch trigger monitoring chassis is used to complete the optical signal interaction for the main branch of the CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis;

[0064] The auxiliary branch trigger monitoring chassis is used to complete the optical signal interaction for the auxiliary branch of the CLCC based on the received trigger signal corresponding to the auxiliary branch.

[0065] The topological structure also includes: a communication control chassis, a collection chassis and a wave recording chassis;

[0066] The communication control chassis is used to exchange information with the pole control system and send the received trigger signal to the main branch trigger monitoring chassis;

[0067] The acquisition chassis is used to collect AC voltage and current;

[0068] The recording box is used for recording on-site signals.

[0069] In this embodiment, the main branch trigger monitoring chassis includes: a first main control board, a plurality of first trigger monitoring boards and a first power supply board;

[0070] The first main control board is used to complete status reporting and analog instruction sending according to the HDLC protocol through a pair of transceiver optical fibers and a protocol conversion device;

[0071] The first trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT;

[0072] The first power supply board is used to supply power to the main branch trigger monitoring chassis.

[0073] The number of the plurality of first trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the main branch of the CLCC.

[0074] In one embodiment, each first trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT, and each first trigger monitoring board triggers and reports the thyristor by encoding through sending and receiving two optical fibers, or triggers and collects the status of the IGBT by Manchester code communication through sending and receiving two optical fibers.

[0075] In this embodiment, the auxiliary branch trigger monitoring chassis includes: a second main control board, a plurality of second trigger monitoring boards and a second power supply board;

[0076] The second main control board is used to send the received trigger signal to the second trigger monitoring board through the backplane;

[0077] The second trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT;

[0078] The second power supply board is used to supply power to the auxiliary branch trigger monitoring chassis.

[0079] In one embodiment, the number of the plurality of second trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the auxiliary branches of the CLCC.

[0080] In one embodiment, each second trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT, and each second trigger monitoring board triggers and reports the thyristor by encoding through sending and receiving two optical fibers, or triggers and collects the status of the IGBT by sending and receiving two optical fibers using Manchester code communication.

[0081] In this embodiment, the topology structure includes: a receiving optical fiber for receiving a trigger angle / commutation gear position signal sent by the pole control and a sending optical fiber for informing the pole control of the operating mode of the current topology structure of the valve control system.

[0082] In one embodiment, the operation modes include: LCC operation mode and CLCC operation mode.

[0083] In a specific embodiment, Figure 2 Taking the CLCC topology structure shown as an example, the CLCC topology structure is composed of a single valve V1-V6, and the single valve is composed of a main branch and an auxiliary branch connected in parallel. The main branch includes a thyristor valve V11 and an IGBT valve V12 connected in series, and the auxiliary branch includes a plurality of thyristors V14 and a plurality of IGBTs V13 connected in series.

[0084] In such Figure 2 In the application scenario shown, the main branch triggers the monitoring chassis, such as Figure 3 As shown, it includes: responsible for triggering and monitoring all thyristors and IGBTs in the main branch, and forwarding the signals received from the communication control chassis to the auxiliary branch trigger monitoring chassis. It includes 2 main control boards, 7 trigger monitoring boards, and 2 power boards. The main control board communicates with the protocol conversion device through a pair of transceiver optical fibers in accordance with the HDLC protocol to complete the status reporting and analog instruction issuance. Trigger monitoring boards 1 to 5 are responsible for completing the optical signal interaction of the main branch V11 thyristor; trigger monitoring board 6 is responsible for completing the optical signal interaction of the bypass thyristor of the main branch V12; trigger monitoring board 7 is responsible for completing the Manchester coded signal interaction of the low-voltage IGBT V12 of the main branch.

[0085] The auxiliary branch triggers the monitoring chassis, such as Figure 4As shown, it includes: responsible for the trigger monitoring of the auxiliary branch thyristor and IGBT. It includes 2 main control boards, 10 trigger monitoring boards, and 2 power boards. The main control board receives the trigger signal and control signal forwarded by the main branch trigger monitoring chassis to generate the final trigger signal and send it to the trigger monitoring board through the backplane. Trigger monitoring boards 1 to 5 are responsible for completing the optical signal interaction of the auxiliary branch V14 thyristor; trigger monitoring boards 6 to 10 are responsible for completing the optical signal interaction of the auxiliary branch V13-IGBT.

[0086] Example 2

[0087] The present invention provides an operation method based on the topological structure of the controllable phase-changing valve control system, the method comprising:

[0088] When the CLCC is in rectification operation or inverter operation and does not need to resist commutation failure, the topology structure of the valve control system controls the IGBT of the main branch of the CLCC to be locked, controls the bypass thyristor valve in parallel with the IGBT to be triggered and turned on, controls the thyristor of the main branch to be triggered and turned on, and controls the thyristor and IGBT in the auxiliary branch of the CLCC to be locked.

[0089] Preferably, the triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch is obtained by inversely calculating the following formula:

[0090] 200A=I d -E*[cosα- cos(α+wt)] / (2 1 / 2 X u )

[0091] In the above formula, A is the unit of current, I d is the DC current, E is the bridge arm voltage, α is the current angle at the current moment, w is the current angular velocity at the current moment, t is the triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch, X u is the virtual impedance of the bridge arm.

[0092] Example 3

[0093] The present invention provides an operation method based on the topological structure of the controllable phase-changing valve control system, the method comprising:

[0094] When the IGBT of the main branch and the auxiliary branch of CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and no AC fault occurs in CLCC, for a single valve in the on state, when the switching current of the single valve is less than the set value, the IGBT in the main branch of the single valve is turned off, the thyristor and IGBT in the auxiliary branch are turned on, and the IGBT in the auxiliary branch is turned off after a preset time delay.

[0095] Example 4

[0096] The present invention provides an operation method based on the topological structure of the controllable phase-changing valve control system, the method comprising:

[0097] When the IGBT of the main branch and the auxiliary branch of the CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and an AC fault occurs in the CLCC, the IGBT of the main branch is turned off, and the thyristor and IGBT in the auxiliary branch are turned on. After the thyristor of the main branch is restored, the IGBT of the auxiliary branch is turned off.

[0098] Example 5

[0099] 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 operation method of the topological structure of the controllable phase-changing valve control system in the above embodiment.

[0100] Example 6

[0101] 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 the operation method of the topological structure of a controllable phase-changing valve control system in the above embodiment.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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 topological structure of a controllable phase-changing valve control system, characterized in that: The topological structure includes: a main branch trigger monitoring chassis and an auxiliary branch trigger monitoring chassis; The main branch trigger monitoring chassis is used to complete the optical signal interaction for the main branch of the CLCC based on the trigger signal corresponding to the main branch in the received trigger signal, and forward the trigger signal corresponding to the auxiliary branch in the received trigger signal to the auxiliary branch trigger monitoring chassis; The auxiliary branch trigger monitoring chassis is used to complete the optical signal interaction for the auxiliary branch of the CLCC based on the received trigger signal corresponding to the auxiliary branch; The main branch trigger monitoring chassis comprises: a first main control board, a plurality of first trigger monitoring boards and a first power supply board; The first main control board is used to complete status reporting and analog instruction sending according to the HDLC protocol through a pair of transceiver optical fibers and a protocol conversion device; The first trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT; The first power supply card is used to supply power to the main branch trigger monitoring chassis; The auxiliary branch trigger monitoring chassis includes: a second main control board, a plurality of second trigger monitoring boards and a second power supply board; The second main control board is used to send the received trigger signal to the second trigger monitoring board through the backplane; The second trigger monitoring board is used to complete the optical signal interaction of the thyristor or the Manchester coded signal interaction of the IGBT; The second power supply board is used to supply power to the auxiliary branch trigger monitoring chassis; Based on the operating method of the topological structure of the controllable phase-changing valve control system, the method comprises: When the CLCC is in rectification operation or inverter operation and does not need to resist commutation failure, the topology structure of the valve control system controls the IGBT of the main branch of the CLCC to be locked, controls the bypass thyristor valve connected in parallel with the IGBT to be triggered and turned on, controls the thyristor of the main branch to be triggered and turned on, and controls the thyristor and IGBT in the auxiliary branch of the CLCC to be locked; The triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch is obtained by inversely calculating the following formula: 200A=I d -E*[cosα- cos(α+wt)] / (2 1 / 2 X u ) In the above formula, A is the unit of current, I d is the DC current, E is the bridge arm voltage, α is the current angle at the current moment, w is the current angular velocity at the current moment, t is the triggering conduction time of the bypass thyristor connected in parallel with the IGBT and the thyristor of the main branch, X u is the virtual impedance of the bridge arm.

2. The topological structure according to claim 1, characterized in that: The number of the plurality of first trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the main branch of the CLCC.

3. The topological structure according to claim 2, characterized in that: Each first trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT. Each first trigger monitoring board triggers and reports the thyristor by encoding through two optical fibers, or triggers and collects the status of the IGBT by Manchester code communication through two optical fibers.

4. The topological structure according to claim 1, characterized in that: The number of the plurality of second trigger monitoring boards is equal to the sum of the number of thyristors and the number of IGBTs in the auxiliary branches of the CLCC.

5. The topological structure according to claim 4, characterized in that: Each second trigger monitoring board corresponds to a first-level thyristor or a first-level IGBT. Each second trigger monitoring board triggers and reports the thyristor by encoding through two optical fibers, or triggers and collects the status of the IGBT by Manchester code communication through two optical fibers.

6. The topological structure according to claim 1, characterized in that: The topological structure includes: a communication control chassis, a collection chassis and a wave recording chassis; The communication control chassis is used to exchange information with the pole control system and send the received trigger signal to the main branch trigger monitoring chassis; The acquisition chassis is used to collect AC voltage and current; The recording box is used for recording on-site signals.

7. The topological structure according to claim 1, characterized in that: The topological structure includes: a receiving optical fiber for receiving a trigger angle / commutation gear position signal sent by the pole control and a sending optical fiber for informing the pole control of the operation mode of the current topological structure of the valve control system.

8. The topological structure according to claim 7, characterized in that: The operation modes include: LCC operation mode and CLCC operation mode.

9. An operating method based on the topological structure of the controllable phase-changing valve control system according to any one of claims 1 to 8, characterized in that: The method comprises: When the IGBT of the main branch and the auxiliary branch of CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and no AC fault occurs in CLCC, for a single valve in the on state, when the switching current of the single valve is less than the set value, the IGBT in the main branch of the single valve is turned off, the thyristor and IGBT in the auxiliary branch are turned on, and the IGBT in the auxiliary branch is turned off after a preset time delay.

10. An operating method based on the topological structure of the controllable phase-changing valve control system according to any one of claims 1 to 8, characterized in that: The method comprises: When the IGBT of the main branch and the auxiliary branch of the CLCC are put into operation, the bypass thyristor in parallel with the IGBT in the main branch is locked and an AC fault occurs in the CLCC, the IGBT of the main branch is turned off, and the thyristor and IGBT in the auxiliary branch are turned on. After the thyristor of the main branch is restored, the IGBT of the auxiliary branch is turned off.

11. 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 operating method of the topological structure of the controllable phase-switching valve control system as claimed in any one of claims 9 and 10 is implemented.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the operating method of the topological structure of the controllable phase-changing valve control system as claimed in any one of claims 9 and 10 is implemented.

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