WO2023087946A1 - 换流器的换相控制方法、装置、电子设备及可读存储介质 - Google Patents

换流器的换相控制方法、装置、电子设备及可读存储介质 Download PDF

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WO2023087946A1
WO2023087946A1 PCT/CN2022/122633 CN2022122633W WO2023087946A1 WO 2023087946 A1 WO2023087946 A1 WO 2023087946A1 CN 2022122633 W CN2022122633 W CN 2022122633W WO 2023087946 A1 WO2023087946 A1 WO 2023087946A1
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Prior art keywords
converter
commutation
power
current
energy consumption
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PCT/CN2022/122633
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English (en)
French (fr)
Inventor
高冲
周行星
张静
杨俊�
盛财旺
贺冬珊
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国网智能电网研究院有限公司
国网上海市电力有限公司
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Publication of WO2023087946A1 publication Critical patent/WO2023087946A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • the present invention is based on a Chinese patent application with application number 202111353541.9 and a filing date of November 16, 2021, and claims the priority of this Chinese patent application.
  • the entire content of this Chinese patent application is hereby incorporated into the present invention by way of introduction.
  • the invention relates to the technical field of direct current transmission systems, and relates to a commutation control method, device, electronic equipment and a readable storage medium of a converter.
  • the thyristors used in the converters of the traditional line commutated converter high voltage direct current (LCC-HVDC) transmission system need to rely on the AC system to provide the commutation voltage, which is prone to commutation in the event of AC system failure Failure, resulting in a surge of DC current, and a rapid and large loss of DC transmission power.
  • the switching device IGBT used in the flexible DC transmission (Voltage Source Converter based High Voltage Direct Current Transmission, VSC-HVDC) has the ability of controllable switching, and its DC transmission basically does not have the problem of commutation failure.
  • a controllable commutation converter combining the advantages of LCC converter and VSC converter was proposed. Its topology is shown in Figure 1, each with 6 pulses
  • the converter bridge is composed of a main branch and an auxiliary branch connected in parallel.
  • the main branch 11 is composed of a conventional thyristor valve and a low-voltage IGBT valve in series
  • the auxiliary branch 12 is composed of a high-voltage low-current IGBT valve and a high-voltage low-current thyristor valve in series.
  • controllable commutation converter can realize the controllability of the bridge arm current no matter in the steady state or during the AC system failure, and solve the problem of commutation failure to the greatest extent.
  • the AC fault at the receiving end causes commutation failure
  • the transmission power of the entire HVDC system will still decrease, which will affect the operation stability of the HVDC system.
  • the embodiments of the present invention provide a commutation control method, device, electronic equipment and a readable storage medium of a converter, so as to avoid commutation failure caused by a failure of the AC system at the receiving end, which may affect the operation stability of the DC system. problem of impact.
  • an embodiment of the present invention provides a commutation control method of a converter, including: obtaining the commutation status of the converter; judging whether the commutation status is normal; when the commutation status is abnormal , controlling the converter to start the energy consumption mode, and adjusting the energy consumption parameter of the converter; wherein, the energy consumption parameter is used to maintain the transmission power in the direct current transmission system where the converter is located.
  • the judging whether the commutation state is normal includes at least one of the following: judging whether the receiving-end AC system corresponding to the converter is faulty; judging Whether the power parameter value of the AC system at the receiving end corresponding to the converter drops.
  • the adjusting the energy consumption parameters of the converter includes: obtaining the current power parameters of the direct current transmission system corresponding to the converter value; judging whether the current power parameter value is at the preset target value; when the current power parameter value is not at the preset target value, based on the difference between the current power parameter value and the preset target value The difference adjusts the energy consumption parameters of the converter.
  • the judging whether the current power parameter value reaches a preset target value includes: Judging whether the current DC power is at a preset target power; adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value includes: based on the The difference between the current direct current power and the preset target power adjusts the energy consumption power of the converter to maintain the transmission power of the direct current transmission system at a constant value.
  • the judging whether the current power parameter value reaches a preset target value includes: Judging whether the current DC voltage reaches a preset target voltage; adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value includes: based on the The difference between the current DC voltage and the preset target voltage adjusts the power consumption of the converter to maintain a constant DC voltage of the DC power transmission system.
  • the converter includes a phase commutation control valve, and when obtaining the corresponding Before the current power parameter value of the DC transmission system, it also includes: judging whether the commutation control valve is turned off; when the commutation control valve is turned off, obtaining the current value of the DC power transmission system corresponding to the converter Power parameter value.
  • the method further includes: when the commutation state is normal, acquiring the commutation switching sequence of the inverter; based on the commutation switching sequence The converter is controlled to perform active phase commutation.
  • an embodiment of the present invention provides a commutation control device for a converter, including: an acquisition module configured to acquire the commutation status of the converter; a judging module configured to judge whether the commutation status is normal; the adjustment module is configured to control the converter to start the energy consumption mode when the commutation state is abnormal, and adjust the energy consumption parameters of the converter; wherein the energy consumption parameters are used to maintain the The transmitted power in the DC transmission system where the converter is located.
  • an embodiment of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor are connected to each other in communication, the memory stores computer instructions, and the processor By executing the computer instructions, the commutation control method of the inverter described in the first aspect or any implementation manner of the first aspect is executed.
  • an embodiment of the present invention provides a computer-readable storage medium, the computer-readable storage medium stores computer instructions, and the computer instructions are used to make the computer execute the first aspect or any implementation of the first aspect.
  • FIG. 1 is a schematic diagram of a topology structure of a controllable commutation converter according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a method for controlling phase commutation of a converter according to an embodiment of the present invention
  • Fig. 3 is another schematic flowchart of a commutation control method of a converter according to an embodiment of the present invention.
  • Fig. 4 is another schematic flowchart of a commutation control method of a converter according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of timing between the main branch and the auxiliary branch when the energy consumption mode is activated according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a handover scenario between a main branch and an auxiliary branch according to an embodiment of the present invention
  • Fig. 7 is a schematic waveform diagram of the inverter output DC voltage and valve voltage before and after the energy consumption mode is started according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a closed-loop control scenario of transmission power according to an embodiment of the present invention.
  • Fig. 9 is a schematic diagram of a DC voltage closed-loop control scenario according to an embodiment of the present invention.
  • Fig. 10 is a schematic diagram of voltage/current waveforms of the converter valves on each side in the converter according to an embodiment of the present invention.
  • Fig. 11 is a schematic diagram of the phase commutation switching sequence of the main branch and the auxiliary branch when the energy consumption mode is not activated according to an embodiment of the present invention
  • Fig. 12 is a schematic diagram of an energy consumption mode not being activated when the AC system at the receiving end fails according to an embodiment of the present invention
  • Fig. 13 is a schematic diagram of an energy consumption mode initiated by a failure of the AC system at the receiving end according to an embodiment of the present invention
  • Fig. 14 is a schematic structural diagram of a commutation control device for a converter according to an embodiment of the present invention.
  • Fig. 15 is a schematic diagram of the hardware structure of the inverter according to the embodiment of the present invention.
  • the controllable commutation converter can combine the advantages of the LCC converter and the VSC converter, and it can realize the controllable bridge arm current no matter in the steady state or during the fault of the AC system, and solve the problem of commutation failure to the greatest extent .
  • the controllable commutation converter can avoid the commutation failure, the transmission power of the entire HVDC system will still decrease, which makes the operation stability of the HVDC system difficult. ensure.
  • the technical solution of the present invention detects the commutation state of the converter in real time, so that when the transmission power of the DC transmission system is abnormal, the energy consumption parameters of the converter can be adjusted in time to ensure that the transmission power of the DC transmission system is constant. value, to ensure the stable operation of the DC transmission system when it is disturbed by the AC system at the receiving end.
  • an embodiment of a commutation control method of an inverter is provided. It should be noted that the steps shown in the flow charts of the drawings can be implemented in a computer system such as a set of computer-executable instructions and, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.
  • a commutation control method of a converter which can be used in electronic equipment, such as a controllable commutation converter, etc.
  • a controllable commutation converter shown in Figure 1 as an example
  • the figure 2 is a schematic flowchart of a commutation control method for a converter according to an embodiment of the present invention, as shown in FIG. 2 , the process includes the following steps:
  • the commutation state is used to characterize the power supply of the DC transmission system during the commutation process of the converter.
  • the controllable commutation converter can detect the power transmission status of the DC transmission system during its commutation process in real time to determine the current commutation state.
  • the controllable commutation converter can determine whether its commutation state is normal through the power transmission situation of the DC transmission system. If the commutation state is abnormal, perform step S13; commutation.
  • the energy consumption mode is used to trigger the commutation operation in advance, and the energy consumption parameter is an operating parameter when the converter is in the energy consumption mode.
  • the controllable commutation converter can start the energy consumption mode to advance Trigger the commutation operation from the main branch to the auxiliary branch, and maintain the stable operation of the DC transmission system by adjusting the energy consumption parameters, while taking into account the successful commutation of the converter and the stable operation of the DC transmission system.
  • the controllable commutation converter operates in an inverter mode
  • the controllable commutation converter includes 6 converter bridge arms
  • each converter bridge arm includes a main branch and an auxiliary branch
  • the main branch is composed of A conventional thyristor valve and a low-voltage high-current IGBT valve are connected in series
  • the auxiliary branch is composed of a high-voltage low-current IGBT valve connected in series with a high-voltage low-current thyristor valve, as shown in Figure 1.
  • the switching timing between the main branch and the auxiliary branch As shown in Figure 5, the switching scene is shown in Figure 6.
  • the high-voltage and low-current IGBT valve is turned off, the DC current can pass through the high-voltage and low-current IGBT valve and the arrester MOV1.
  • the DC current (voltage) output by the controllable commutation converter is increased, and the excess DC power will be MOV1 is consumed, so the normal power transmission of the DC transmission system during the commutation process is maintained through the energy consumption mode.
  • the converter output DC voltage and valve voltage waveforms before and after the energy consumption mode is started are shown in Figure 7.
  • the commutation control method of the converter judges whether the commutation status is normal by obtaining the commutation status of the converter, and when the commutation status is abnormal, controls the converter to start the energy consumption mode to adjust the commutation status. Therefore, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, it is possible to maintain the transmission power in the DC transmission system where the converter is located by adjusting the energy consumption parameters of the converter, and avoid the AC power at the receiving end. The impact of system faults on the DC transmission system ensures that the DC transmission system is in a stable operating state.
  • FIG. 3 is a commutation control method of a converter according to an embodiment of the present invention.
  • a flowchart of the process, as shown in Figure 3, the process includes the following steps:
  • step S21 Obtain the commutation state of the converter.
  • step S11 in the above-mentioned embodiment.
  • the above step S22 includes at least one of the following: judging whether the AC system at the receiving end corresponding to the converter is faulty; judging whether the power parameter value of the AC system at the receiving end corresponding to the converter drops.
  • the receiving-end AC system refers to the regional power grid that is mainly receiving electricity at one end of the main grid.
  • the receiving-end AC system fails or the value of current parameters such as voltage and current drops, it will directly cause damage to the power transmission of the DC transmission system. Furthermore, it will bring adverse effects to the sending end system connected to the direct current transmission system. Therefore, when performing the commutation operation, it is necessary to detect at least one of the following indicators in real time: whether the receiving-end AC system corresponding to the converter fails, and whether the power parameter value of the receiving-end AC system corresponding to the converter drops.
  • determining whether the commutation state is normal includes at least one of the following: by judging whether the AC system at the receiving end corresponding to the converter is faulty; whether the power parameter value of the AC system at the receiving end is decline. Therefore, by determining the commutation state, it is possible to avoid commutation when the commutation state is abnormal, enable the energy consumption mode in time, and prevent the abnormal commutation state from affecting the stable operation of the direct current transmission system.
  • step S23 is executed; otherwise, the normal commutation operation is continued.
  • step S23 includes:
  • the commutation control valve is set on the auxiliary branch, and the IGBT valve shown in Figure 1 is the commutation control valve.
  • the controllable commutation converter can detect whether the commutation control valve is closed in real time. When it is detected that the commutation control valve is closed, step S232 is executed; otherwise, continue to detect the closed state of the commutation control valve.
  • the current power parameter value is used to represent the current operating state of the DC transmission system, which may include DC voltage, DC power, and of course DC current.
  • the power parameter is not specifically limited here, and those skilled in the art can Need to be sure.
  • the controllable commutation converter When the commutation control valve is turned off, it means that the controllable commutation converter is in the commutation operation in the energy consumption mode.
  • the The current power parameter value of the DC power transmission system corresponding to the converter can be detected in real time, so that the energy consumption parameter of the converter can be adjusted in time when the power parameter value of the DC power transmission system is abnormal.
  • the preset target value is the power parameter value when the DC transmission system is in stable operation.
  • the controllable commutation converter can compare the current power parameter value detected in real time with the preset target value to determine whether the current power parameter value is It is at the preset target value. If the current power parameter value is not at the preset target value, execute step S234; otherwise, maintain the working state of the inverter and detect the change of the current power parameter value in real time.
  • the energy consumption parameters are operating parameters when the converter is in the energy consumption mode, such as energy consumption power, energy consumption voltage, and the like.
  • the controllable commutation converter can calculate the difference between the current power parameter value and the preset target value, and adjust the energy consumption parameters of the converter according to the difference In order to make the power parameter value of the direct current transmission system reach the preset target value.
  • the above steps S232 to S234 may include:
  • the controllable commutation converter can detect the current DC power of the DC power transmission system corresponding to the converter in real time.
  • the DC power can be obtained by a power detection device installed on the DC transmission system side, or can be obtained by calculating the obtained current value and voltage value on the DC transmission system side, and of course can also be obtained by other methods, which are not specifically limited here.
  • the preset target power is the power value when the DC transmission system is in stable operation.
  • the controllable commutation converter can compare the current DC power detected in real time with the preset target power to determine whether the current DC power is at the preset target power.
  • Target power if the current DC power is not at the preset target power, perform step (3), otherwise maintain the working state of the converter and detect the change of the current DC power in real time.
  • the controllable commutation converter can adjust the energy consumption power of the controllable commutation converter in real time according to the difference between the real-time DC power value and the preset target power.
  • the preset target power is P0
  • the real-time DC power is P(t)
  • the controllable commutation converter takes the real-time DC power value and the preset target power as input quantities, and forms the maintenance by calculating the difference between them
  • the transmission power of the DC transmission system is under constant closed-loop control, as shown in Figure 8.
  • the above steps S232 to S234 may include:
  • the controllable commutation converter can detect the current DC voltage of the DC power transmission system corresponding to the converter in real time.
  • the direct current voltage can be obtained by a voltage detection device provided on the direct current transmission system side, such as a voltmeter, and of course can also be obtained by other means or other devices, which are not specifically limited here.
  • the preset target voltage is the voltage value when the DC transmission system is in stable operation.
  • the controllable commutation converter can compare the current DC voltage detected in real time with the preset target voltage to determine whether the current DC voltage is at the preset target voltage.
  • Target voltage if the current DC voltage is not at the preset target voltage, perform step (3), otherwise maintain the working state of the converter and detect the change of the current DC voltage in real time.
  • the controllable commutation converter can adjust the energy consumption of the controllable commutation converter in real time according to the difference between the real-time DC voltage and the preset target voltage, so that the DC voltage of the DC transmission system can be maintained at the preset target voltage, that is, Maintain its DC voltage at a constant value.
  • the preset target voltage is Ud0
  • the real-time DC voltage is Ud(t)
  • the controllable commutation converter takes the real-time DC voltage and the preset target voltage as input quantities, and forms the maintaining DC voltage by calculating the difference between them.
  • the DC voltage of the transmission system is in a constant value closed-loop control, as shown in Figure 9.
  • the commutation control method of the converter uses at least one of the following: judging whether the converter is faulty; judging whether the power parameter value of the DC system corresponding to the converter has dropped to determine whether the commutation state is normal, In this way, it is possible to ensure that the energy consumption mode is turned on in time, so as to prevent the abnormal commutation state from affecting the stable operation of the direct current transmission system.
  • the current power parameter value of the DC transmission system corresponding to the converter is obtained to monitor the commutation of the converter in real time
  • the power parameters corresponding to the DC transmission system during the process are convenient for determining the operating status of the DC transmission system during the commutation process.
  • FIG. 4 is a commutation control method of a converter according to an embodiment of the present invention.
  • a flowchart of the process, as shown in Figure 4, the process includes the following steps:
  • step S31 Obtain the commutation state of the converter.
  • step S11 in the above-mentioned embodiment.
  • step S32 judging whether the commutation state is normal.
  • step S12 foregoing embodiment.
  • step S33 When the commutation state is abnormal, control the converter to start the energy consumption mode, and adjust the energy consumption parameters of the converter.
  • control the converter to start the energy consumption mode, and adjust the energy consumption parameters of the converter.
  • the commutation switching sequence is the switching sequence of active commutation from the main branch to the auxiliary branch in the bridge arm converter valve.
  • the controllable commutation converter does not start the energy consumption mode, and the controllable commutation converter is in a normal commutation state.
  • Each converter valve in the controllable commutation converter is in the controllable off state, as shown in Figure 10, the voltage of the converter valves (V1, V3, V5, V2, V4, V6) on each side of the converter current waveform.
  • the controllable commutation converter can obtain the commutation switching timing of the main branch and the auxiliary branch in the converter valve, as shown in FIG. 11 .
  • the main branch and the auxiliary branch in the converter valve are controlled to perform normal commutation.
  • the commutation valves V1, V3, V5, V2, V4, V6 on each side of the adjacent phases with the same odd number or the same even number operate normally according to the commutation switching sequence.
  • Commutation such as V1, V3 commutation, V3, V5 commutation, and so on.
  • the rated DC power is 8000MW
  • the inverter side converter adopts a controllable commutated converter.
  • the commutation control method of the converter when the commutation status of the converter is normal, the commutation switching sequence of the converter is obtained, and the main branch and the auxiliary branch of the converter are controlled based on the commutation switching sequence. Active commutation between circuits, so that the converter performs active commutation according to the predetermined commutation switching sequence in the normal commutation state, and in some embodiments, the stable operation of the DC transmission system is guaranteed.
  • a commutation control device for a converter is also provided, and the device is configured to realize the above-mentioned embodiments and implementation modes.
  • the term "module” may realize at least one of: a combination of software and hardware of a predetermined function.
  • This embodiment provides a commutation control device for a converter, as shown in FIG. 14 , including:
  • the obtaining module 41 is configured to obtain the commutation state of the converter. For details, refer to the relevant descriptions of the corresponding steps in the above method embodiments.
  • the judging module 42 is configured to judge whether the commutation state is normal. For details, refer to the relevant descriptions of the corresponding steps in the above method embodiments.
  • the adjustment module 43 is configured to control the converter to start the energy consumption mode and adjust the energy consumption parameters of the converter when the commutation state is abnormal. For details, refer to the relevant descriptions of the corresponding steps in the above method embodiments.
  • the commutation control device of the converter provided in this embodiment judges whether the commutation status is normal by acquiring the commutation status of the converter. Therefore, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, it is possible to maintain the transmission power in the DC transmission system where the converter is located by adjusting the energy consumption parameters of the converter, and avoid the AC power at the receiving end.
  • the impact of system faults on the DC transmission system ensures that the DC transmission system is in a stable operating state.
  • the commutation control device of the converter in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC circuit that executes at least one of the following: one or more software or fixed program processors, memory and Other devices that can provide the above functions.
  • the judging module is at least configured as one of the following: judging whether the receiving-end AC system corresponding to the converter is faulty; judging the power parameters of the receiving-end AC system corresponding to the converter whether the value drops.
  • the adjustment module further includes an acquisition submodule, a judgment submodule, and an adjustment submodule, wherein: the acquisition submodule is configured to acquire the current power parameter value of the direct current transmission system corresponding to the converter; The judgment submodule is configured to judge whether the current power parameter value reaches a preset target value; the adjustment submodule is configured to, when the current power parameter value is not at the preset target value, based on the current power parameter value The difference between the preset target value and the energy consumption parameter of the converter is adjusted.
  • the judging submodule is further configured to: judge whether the current DC power is at a preset target power; correspondingly, the adjusting submodule, It is further configured to: adjust the energy consumption power of the converter based on the difference between the current direct current power and the preset target power, and maintain the transmission power of the direct current transmission system at a constant value.
  • the judging submodule is further configured to: judge whether the current DC voltage reaches a preset target voltage; correspondingly, the adjusting submodule, It is further configured to: adjust the energy consumption power of the converter based on the difference between the current DC voltage and the preset target voltage, so as to maintain a constant DC voltage of the DC power transmission system.
  • the converter includes a commutation control valve
  • the judging module is further configured to: judge whether the commutation control valve is turned off; when the commutation control valve is turned off,
  • the acquisition module is further configured to: acquire the current power parameter value of the direct current transmission system corresponding to the converter.
  • the acquiring module is further configured to: acquire the commutation switching sequence of the converter; the device further includes: a phase commutation module configured to The commutation switching sequence controls the converter to perform active commutation.
  • An embodiment of the present invention also provides an electronic device having the above-mentioned commutation control device for a converter shown in FIG. 14 .
  • FIG. 15 is a schematic structural view of an electronic device in an optional embodiment of the present invention, as shown in FIG. 15, the electronic device may include: at least one processor 501, such as a CPU (Central Processing Unit, central processing device), at least one communication interface 503, memory 504, and at least one communication bus 502.
  • the communication bus 502 is used to realize connection and communication between these components.
  • the communication interface 503 may include a display screen (Display) and a keyboard (Keyboard), and the optional communication interface 503 may also include a standard wired interface and a wireless interface.
  • the memory 504 may be a high-speed RAM memory (Random Access Memory, volatile random access memory), or a non-volatile memory (non-volatile memory), such as at least one disk memory.
  • the memory 504 may also be at least one storage device located away from the aforementioned processor 501 .
  • the processor 501 may be combined with the device described in FIG. 14 , the memory 504 stores an application program, and the processor 501 invokes the program code stored in the memory 504 to execute any of the above method steps.
  • the communication bus 502 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (EISA for short) bus or the like.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the communication bus 502 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used in FIG. 15 , but it does not mean that there is only one bus or one type of bus.
  • the memory 504 may include a volatile memory (English: volatile memory), such as a random-access memory (English: random-access memory, abbreviated as RAM); the memory may also include a non-volatile memory (English: non-volatile memory).
  • memory such as flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviated: HDD) or solid-state hard disk (English: solid-state drive, abbreviated: SSD); memory 504 can also include the above-mentioned types of memory The combination.
  • the processor 501 may be a central processing unit (English: central processing unit, abbreviated: CPU), a network processor (English: network processor, abbreviated: NP) or a combination of CPU and NP.
  • the processor 501 may also include a hardware chip.
  • the aforementioned hardware chip may be an application-specific integrated circuit (English: application-specific integrated circuit, abbreviation: ASIC), a programmable logic device (English: programmable logic device, abbreviation: PLD) or a combination thereof.
  • the above PLD can be a complex programmable logic device (English: complex programmable logic device, abbreviated: CPLD), field programmable logic gate array (English: field-programmable gate array, abbreviated: FPGA), general array logic (English: generic array logic, abbreviation: GAL) or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL general array logic
  • the memory 504 is also used to store program instructions.
  • the processor 501 can invoke program instructions to implement the commutation control method of the converter as shown in the embodiments of Fig. 2 to Fig. 4 of the present invention.
  • An embodiment of the present invention also provides a computer program product, the computer program product carries a program code, and the instructions included in the program code can be used to execute the steps of the interaction method described in the above method embodiment, please refer to the above method embodiment .
  • the above-mentioned computer program product may be implemented by means of hardware, software or a combination thereof.
  • the computer program product is embodied as a computer storage medium, and in another optional embodiment, the computer program product is embodied as a software product, such as a software development kit (Software Development Kit, SDK) and the like.
  • the embodiment of the present invention also provides a non-transitory computer storage medium, the computer storage medium stores computer-executable instructions, and the computer-executable instructions can execute the commutation control method of the converter in any of the above-mentioned method embodiments processing method.
  • the storage medium can be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a flash memory (Flash Memory), a hard disk (Hard Disk) Disk Drive, abbreviation: HDD) or solid-state hard drive (Solid-State Drive, SSD) etc.;
  • the storage medium can also include the combination of above-mentioned types of memory.

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Abstract

本发明涉及直流输电系统技术领域，公开了一种换流器的换相控制方法、装置、电子设备及可读存储介质。其中，该方法包括：获取换流器的换相状态；判断换相状态是否正常；当换相状态异常时，控制换流器启动耗能模式，调节换流器的耗能参数；其中，所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。

Description

换流器的换相控制方法、装置、电子设备及可读存储介质
相关申请的交叉引用
本发明基于申请号为202111353541.9、申请日为2021年11月16日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本发明。
技术领域
本发明涉及直流输电系统技术领域，涉及一种换流器的换相控制方法、装置、电子设备及可读存储介质。
背景技术
传统的电网换相高压直流(line commutated converter high voltage direct current，LCC-HVDC)输电系统的换流器所采用的晶闸管需要依赖交流系统提供换相电压，在交流系统故障等情况下容易发生换相失败，导致直流电流激增，直流传输功率迅速大量损失。而柔性直流输电(Voltage Source Converter based High Voltage Direct Current Transmission，VSC-HVDC)所采用的开关器件IGBT具备可控开关的能力，其直流输电基本没有出现过换相失败问题。
为解决LCC-HVDC输电系统换相失败难题，结合LCC换流器和VSC换流器二者优势的可控换相换流器被提了出来，其拓扑如图1所示，每个6脉动换流桥由主支路和辅助支路并联构成，主支路11由原有常规晶闸管阀和低压IGBT阀串联构成，辅助支路12由高压小电流IGBT阀和高压小电流晶闸管阀串联构成。由此不管是稳态还是交流系统故障期间，可控换相换流器均可实现桥臂电流可控，最大程度的解决换相失败问题。然而，在受端交流故障引起换相失败时，即便上述可控换相换流器能够避免换相失败，整个直流输电系统的传输功率仍会下降，影响直流输电系统的运行稳定性。
发明内容
有鉴于此，本发明实施例提供了一种换流器的换相控制方法、装置、电子设备及可读存储介质，以避免受端交流系统故障引起换相失败而导致直流系统运行稳定性受影响的问题。
根据第一方面，本发明实施例提供了一种换流器的换相控制方法，包括：获取换流器的换相状态；判断所述换相状态是否正常；当所述换相状态异常时，控制所述换流器启动耗能模式，调节所述换流器的耗能参数；其中，所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。
结合第一方面，在第一方面的第一实施方式中，所述判断所述换相状态是否正常，至少包括以下一种：判断所述换流器对应的受端交流系统是否出现故障；判断所述换流器对应的受端交流系统的电力参数值是否下降。
结合第一方面第一实施方式，在第一方面的第二实施方式中，所述调节所述换流器的耗能参数，包括：获取所述换流器对应的直流输电系统的当前电力参数值；判断所述当前电力参数值是否处于预设目标值；当所述当前电力参数值未处于所述预设目标值时，基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数。
结合第一方面第二实施方式，在第一方面的第三实施方式中，当所述当前电力参数值为直流功率时，所述判断所述当前电力参数值是否达到预设目标值，包括：判断所述当前直流功率是否处于预设目标功率；所述基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数，包括：基于所述当前直流功率与所述预设目标功率之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的传输功率处于恒定。
结合第一方面第二实施方式，在第一方面的第四实施方式中，当所述当前电力参数值为直流电压时，所述判断所述当前电力参数值是否达到预设目标值，包括：判断所述当前直流电压是否达到预设目标电压；所述基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数，包括：基于所述当前直流电压与所述预设目标电压之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的直流电压处于恒定。
结合第一方面第二实施方式至第四实施方式中任一实施方式，在第一方面的第五实施方式中，所述换流器包括换相控制阀，在获取所述换流器对应的直流输电系统的当前电力参数值之前，还包括：判断所述换相控制 阀是否被关断；当所述换相控制阀被关断时，获取所述换流器对应的直流输电系统的当前电力参数值。
结合第一方面，在第一方面的第六实施方式中，所述方法还包括：当所述换相状态正常时，获取所述换流器的换相切换时序；基于所述换相切换时序控制所述换流器进行主动换相。
根据第二方面，本发明实施例提供了一种换流器的换相控制装置，包括：获取模块，配置为获取换流器的换相状态；判断模块，配置为判断所述换相状态是否正常；调节模块，配置为当所述换相状态异常时，控制所述换流器启动耗能模式，调节所述换流器的耗能参数；其中，所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。
根据第三方面，本发明实施例提供了一种电子设备，包括：存储器和处理器，所述存储器和所述处理器之间互相通信连接，所述存储器中存储有计算机指令，所述处理器通过执行所述计算机指令，从而执行第一方面或第一方面任一实施方式所述的换流器的换相控制方法。
根据第四方面，本发明实施例提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机指令，所述计算机指令用于使计算机执行第一方面或第一方面任一实施方式所述的换流器的换相控制方法。
附图说明
为了更清楚地说明本发明实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，下面描述中的附图是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本发明实施例中可控换相换流器的拓扑结构示意图；
图2是根据本发明实施例的换流器的换相控制方法的流程示意图；
图3是根据本发明实施例的换流器的换相控制方法的另一流程示意图；
图4是根据本发明实施例的换流器的换相控制方法的另一流程示意图；
图5是根据本发明实施例的启动耗能模式的情况下主支路与辅助支路之间的时序示意图；
图6是根据本发明实施例的主支路与辅助支路之间的切换场景示意图；
图7是根据本发明实施例的耗能模式启动前后的换流器输出直流电压及阀电压的波形示意图；
图8是根据本发明实施例的传输功率的闭环控制场景示意图；
图9是根据本发明实施例的直流电压的闭环控制场景示意图；
图10是根据本发明实施例的换流器中每侧换流阀的电压/电流的波形示意图；
图11是根据本发明实施例的不启动耗能模式的情况下主支路与辅助支路的换相切换时序示意图；
图12是根据本发明实施例的受端交流系统故障不启动耗能模式的示意图；
图13是根据本发明实施例的受端交流系统故障启动耗能模式的示意图；
图14是根据本发明实施例的换流器的换相控制装置的结构示意图；
图15是本发明实施例的换流器的硬件结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
可控换相换流器能够结合LCC换流器和VSC换流器二者优势，不管是稳态还是交流系统故障期间，其均可实现桥臂电流可控，最大程度的解决换相失败问题。然而，在受端交流系统故障引起换相失败时，即便可控换相换流器能够避免换相失败，但是整个直流输电系统的传输功率仍会下降，从而导致直流输电系统的运行稳定性难以保证。
基于此，本发明技术方案通过实时检测换流器的换相状态，以便在直流输电系统的传输功率出现异常时，及时调节换流器的耗能参数，以保证书直流输电系统的传输功率处于恒定值，确保直流输电系统在受到受端交流系统扰动时维持直流输电系统的稳定运行。
根据本发明实施例，提供了一种换流器的换相控制方法的实施例，需要说明的是，在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行，并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
在本实施例中提供了一种换流器的换相控制方法，可用于电子设备，如可控换相换流器等，以图1所示的可控换相换流器为例，图2是根据本发明实施例的换流器的换相控制方法的流程示意图，如图2所示，该流程包括如下步骤：
S11，获取换流器的换相状态。
换相状态用于表征换流器换相过程中直流输电系统的供电情况。可控换相换流器可以实时检测其换相过程中直流输电系统的电力传输情况，以确定当前的换相状态。
S12，判断换相状态是否正常。
可控换相换流器可以通过直流输电系统的电力传输情况确定其换相状态是否正常，若换相状态异常，则执行步骤S13，否则按照正常换相状态进行主支路向辅助支路的主动换相。
S13，控制换流器启动耗能模式，调节换流器的耗能参数；其中，所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。
耗能模式用于提前触发换相操作，耗能参数为换流器处于耗能模式的运行参数。当检测到直流输电系统的电力传输情况发生异常时，可以确定换流器的换相状态异常，此时为了保证直流输电系统的正常运行，可控换相换流器可以启动耗能模式以提前触发主支路向辅助支路的换相操作，并通过调节耗能参数维持直流输电系统的稳定运行，同时兼顾换流器的成功换相和直流输电系统的稳定运行。
示例性地，可控换相换流器以逆变方式运行，可控换相换流器包括6个换流桥臂，每个换流桥臂包含主支路和辅助支路，主支路由常规晶闸管阀和低压大电流IGBT阀串联构成，辅助支路由高压小电流IGBT阀和高压小电流晶闸管阀串联构成，如图1所示。当启动可控换相换流器的耗能模式时，可控换相换流器辅助支路触发时间提前，其工作模式切换至耗能模式，主支路与辅助支路之间的切换时序如图5所示，切换场景如图6所示。当高压小电流IGBT阀关断后，直流电流可以通过高压小电流IGBT阀以及避雷器MOV1，此时可控换相换流器输出的直流电流(电压)被抬高，多余的直流功率则会被MOV1消耗掉，由此通过耗能模式维持直流输电系统在换相过程中的正常电力传输，耗能模式启动前后换流器输出直流电压及阀电压波形如图7所示。
本实施例提供的换流器的换相控制方法，通过获取换流器的换相状态， 判断换相状态是否正常，当换相状态异常时，控制换流器启动耗能模式，调节换流器的耗能参数，由此在保证主支路向辅助支路换相成功的基础上，能够通过调节换流器的耗能参数维持换流器所在直流输电系统中的传输功率，避免受端交流系统故障对直流输电系统的影响，保证直流输电系统处于稳定的运行状态。
在本实施例中提供了一种换流器的换相控制方法，可用于电子设备，如可控换相换流器等，图3是根据本发明实施例的换流器的换相控制方法的流程示意图，如图3所示，该流程包括如下步骤：
S21，获取换流器的换相状态。详细说明参见上述实施例对应步骤S11的相关描述。
S22，判断换相状态是否正常。
在一些实施例中，上述步骤S22至少包括以下一种：判断换流器对应的受端交流系统是否出现故障；判断换流器对应的受端交流系统的电力参数值是否下降。
受端交流系统指处于主网一端的以受电为主的地区电网，当受端交流系统出现故障或电压、电流等电流参数值下降时，其会直接导致直流输电系统的电力传输受损，进而为连接直流输电系统的送端系统带来不利影响。因此在执行换相操作时，需要实时检测至少以下一种指标：换流器对应的受端交流系统是否出现故障，换流器对应的受端交流系统的电力参数值是否下降。
本发明实施例提供的换流器的换相控制方法，确定换相状态是否正常至少包括以下一种：通过判断换流器对应的受端交流系统是否出现故障；受端交流系统电力参数值是否下降。由此，通过确定换相状态能够避免在换相状态异常情况下进行换相，及时开启耗能模式，避免换相状态异常影响直流输电系统的稳定运行。
当受端交流系统出现故障或者受端交流系统的电力参数值下降时，执行步骤S23，否则继续执行正常的换相操作。
S23，控制换流器启动耗能模式，调节换流器的耗能参数。
示例性地，上述步骤S23包括：
S231，判断换相控制阀是否被关断。
换相控制阀设置在辅助支路上，如图1所示的IGBT阀即为换相控制阀。在换流器的工作模式切换至耗能模式时，主支路向辅助支路的换相操作将 会被提前触发，此时可控换相换流器可以实时检测换相控制阀是否被关闭。当检测到换相控制阀被关断时，执行步骤S232，否则继续检测换相控制阀的关断状态。
S232，获取换流器对应的直流输电系统的当前电力参数值。
当前电力参数值用于表征当前直流输电系统的运行状态，其可以包括直流电压，也可以包括直流功率，当然还可以包括直流电流，此处对电力参数不作具体限定，本领域技术人员可以根据实际需要确定。
当换相控制阀被关断时，表示可控换相换流器处于耗能模式下的换相操作，为了保证直流输电系统不会受到受端交流系统的干扰，可控换相换流器可以实时检测换流器对应的直流输电系统的当前电力参数值，以便在直流输电系统的电力参数值出现异常时及时调节换流器的耗能参数。
S233，判断当前电力参数值是否处于预设目标值。
预设目标值为直流输电系统处于稳定运行时的电力参数值，可控换相换流器可以将其实时检测到的当前电力参数值与预设目标值进行比较，以确定当前电力参数值是否处于预设目标值，若当前电力参数值未处于预设目标值，执行步骤S234，否则维持换流器的工作状态并实时检测当前电力参数值的变化。
S234，基于当前电力参数值与预设目标值之间的差值调节换流器的耗能参数。
耗能参数为换流器处于耗能模式时的运行参数，比如耗能功率、耗能电压等。在当前电力参数值未处于预设目标值时，可控换相换流器可以计算当前电力参数值与预设目标值之间的差值，并根据该差值调节换流器的耗能参数以使直流输电系统的电力参数值达到预设目标值。
可选地，若当前电力参数值为直流功率，则上述步骤S232至S234可以包括：
(1)获取换流器对应的直流输电系统的当前直流功率。
可控换相换流器可以实时检测换流器对应的直流输电系统的当前直流功率。该直流功率可以通过直流输电系统侧设置的功率检测装置获取，也可以获取到的直流输电系统侧的电流值和电压值计算得到，当然还可以通过其他方式获取，此处不作具体限定。
(2)判断当前直流功率是否处于预设目标功率。
预设目标功率为直流输电系统处于稳定运行时的功率值，可控换相换 流器可以将其实时检测到的当前直流功率与预设目标功率进行比较，以确定当前直流功率是否处于预设目标功率，若当前直流功率未处于预设目标功率，执行步骤(3)，否则维持换流器的工作状态并实时检测当前直流功率的变化。
(3)基于当前直流功率与预设目标功率之间的差值调节换流器的耗能功率，维持直流输电系统的传输功率处于恒定。
可控换相换流器可以根据实时直流功率值和预设目标功率之间的差值来实时调节可控换相换流器的耗能功率。示例性地，若预设目标功率为P0，实时直流功率为P(t)，可控换相换流器以实时直流功率值和预设目标功率作为输入量，通过计算两者之差形成维持直流输电系统的传输功率处于恒定值的闭环控制，如图8所示。
可选地，若当前电力参数值为直流电压，则上述步骤S232至S234可以包括：
(1)获取换流器对应的直流输电系统的当前直流电压。
可控换相换流器可以实时检测换流器对应的直流输电系统的当前直流电压。该直流电压可以通过直流输电系统侧设置的电压检测装置进行获取，例如电压表，当然还可以通过其他方式或其他装置获取，此处不作具体限定。
(2)判断当前直流电压是否达到预设目标电压。
预设目标电压为直流输电系统处于稳定运行时的电压值，可控换相换流器可以将其实时检测到的当前直流电压与预设目标电压进行比较，以确定当前直流电压是否处于预设目标电压，若当前直流电压未处于预设目标电压，执行步骤(3)，否则维持换流器的工作状态并实时检测当前直流电压的变化。
(3)基于当前直流电压与预设目标电压之间的差值调节换流器的耗能功率，维持直流输电系统的直流电压处于恒定。
可控换相换流器可以根据实时直流电压和预设目标电压的差值来实时调节可控换相换流器耗能功率，以使直流输电系统的直流电压维持在预设目标电压，即维持其直流电压处于恒定值。示例性地，若预设目标电压为Ud0，实时直流电压为Ud(t)，可控换相换流器以实时直流电压和预设目标电压作为输入量，通过计算两者之差形成维持直流输电系统的直流电压处于恒定值的闭环控制，如图9所示。
本实施例提供的换流器的换相控制方法，通过至少以下一种：判断换流器是否出现故障；判断换流器对应的直流系统的电力参数值是否下降以确定换相状态是否正常，由此能够及时保证耗能模式及时开启，避免换相状态异常影响直流输电系统的稳定运行。
在上述实施例中，通过判断换相控制阀是否被关断，在换相控制阀被关断时，获取换流器对应的直流输电系统的当前电力参数值，以实时监测换流器换相过程中直流输电系统所对应的电力参数，便于确定换相过程中直流输电系统的运行状态。
在上述实施例中，通过获取换流器对应的直流输电系统的当前电力参数值，在当前电力参数值未处于预设目标值时，基于当前电力参数值与预设目标值之间的差值调节换流器的耗能参数，以使当前电力参数能够维持在预设目标值，从而维持直流输电系统的传输功率的平衡和直流电压的稳定，提高了直流输电系统的运行稳定性，从而提高了电网稳定运行性。
在本实施例中提供了一种换流器的换相控制方法，可用于电子设备，如可控换相换流器等，图4是根据本发明实施例的换流器的换相控制方法的流程示意图，如图4所示，该流程包括如下步骤：
S31，获取换流器的换相状态。详细说明参见上述实施例对应步骤S11的相关描述。
S32，判断换相状态是否正常。详细说明参见上述实施例对应步骤S12的相关描述。
S33，当换相状态异常时，控制换流器启动耗能模式，调节换流器的耗能参数。详细说明参见上述实施例对应步骤S13的相关描述。
S34，当换相状态正常时，获取换流器的换相切换时序。
换相切换时序为桥臂换流阀中主支路向辅助支路进行主动换相的切换时序。当换相状态正常时，可控换相换流器不启动耗能模式，可控换相换流器处于正常换相状态。可控换相换流器中每个换流阀处于可控关断状态，如图10所示的换流器中每侧换流阀(V1、V3、V5、V2、V4、V6)的电压电流波形。当换相状态正常时，可控换相换流器可以对换流阀中的主支路与辅助支路的换相切换时序进行获取，如图11所示。
S35，基于换相切换时序控制换流器进行主动换相。
通过获取到的主支路与辅助支路的换相切换时序，控制换流阀中的主支路与辅助支路进行正常换相。可控换相换流器中每侧换流阀(V1、V3、 V5、V2、V4、V6)邻相之间的编号同为奇数或同为偶数的换相阀按照换相切换时序进行正常换相，例如V1、V3换相，V3、V5换相，以此类推。
以某直流工程为例，工程额定直流电压Udc＝±800kV，额定直流功率为8000MW，逆变侧换流器采用可控换相换流器，当受端交流系统发生单相接地故障时，若不启动耗能模式，受端交流系统发生单相接地故障后，直流输电系统的直流功率下降，受端交流系统的电压、直流功率和逆变器阀电压如图12所示；若启动耗能模式，且采用维持直流输电系统传输功率为恒定值的闭环控制，受端交流系统发生单相接地故障后直流功率保持恒定，受端交流系统的电压、直流功率和逆变器阀电压如图13所示。
本实施例提供的换流器的换相控制方法，在换流器的换相状态正常时，获取换流器的换相切换时序，基于换相切换时序控制换流器主支路和辅助支路之间的主动换相，由此使得换流器在正常换相状态下按照既定的换相切换时序进行主动换相，在一些实施例中保证了直流输电系统的稳定运行。
在本实施例中还提供了一种换流器的换相控制装置，该装置配置为实现上述实施例及实施方式。如以下所使用的，术语“模块”可以实现至少以下一种：预定功能的软件、硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
本实施例提供一种换流器的换相控制装置，如图14所示，包括：
获取模块41，配置为获取换流器的换相状态。详细说明参见上述方法实施例对应步骤的相关描述。
判断模块42，配置为判断换相状态是否正常。详细说明参见上述方法实施例对应步骤的相关描述。
调节模块43，配置为当换相状态异常时，控制换流器启动耗能模式，调节换流器的耗能参数。详细说明参见上述方法实施例对应步骤的相关描述。
本实施例提供的换流器的换相控制装置，通过获取换流器的换相状态，判断换相状态是否正常，当换相状态异常时，控制换流器启动耗能模式，调节换流器的耗能参数，由此在保证主支路向辅助支路换相成功的基础上，能够通过调节换流器的耗能参数维持换流器所在直流输电系统中的传输功率，避免受端交流系统故障对直流输电系统的影响，保证直流输电系统处于稳定的运行状态。
本实施例中的换流器的换相控制装置是以功能单元的形式来呈现，这里的单元是指ASIC电路，执行至少以下一种：一个或多个软件或固定程序的处理器、存储器和其他可以提供上述功能的器件。
在一些实施例中，所述判断模块，还至少配置为以下一种：判断所述换流器对应的受端交流系统是否出现故障；判断所述换流器对应的受端交流系统的电力参数值是否下降。
在一些实施例中，所述调节模块，还包括获取子模块、判断子模块和调节子模块，其中：获取子模块，配置为获取所述换流器对应的直流输电系统的当前电力参数值；判断子模块，配置为判断所述当前电力参数值是否达到预设目标值；调节子模块，配置为当所述当前电力参数值未处于所述预设目标值时，基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数。
在一些实施例中，当所述当前电力参数值为直流功率时，所述判断子模块，还配置为：判断所述当前直流功率是否处于预设目标功率；对应地，所述调节子模块，还配置为：基于所述当前直流功率与所述预设目标功率之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的传输功率处于恒定。
在一些实施例中，当所述当前电力参数值为直流电压时，所述判断子模块，还配置为：判断所述当前直流电压是否达到预设目标电压；对应地，所述调节子模块，还配置为：基于所述当前直流电压与所述预设目标电压之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的直流电压处于恒定。
在一些实施例中，所述换流器包括换相控制阀，所述判断模块，还配置为：判断所述换相控制阀是否被关断；当所述换相控制阀被关断时，所述获取模块，还配置为：获取所述换流器对应的直流输电系统的当前电力参数值。
在一些实施例中，当所述换相状态正常时，所述获取模块，还配置为：获取所述换流器的换相切换时序；所述装置还包括：换相模块，配置为基于所述换相切换时序控制所述换流器进行主动换相。
本发明实施例还提供一种电子设备，具有上述图14所示的换流器的换相控制装置。
请参阅图15，图15是本发明可选实施例的一种电子设备的结构示意图， 如图15所示，该电子设备可以包括：至少一个处理器501，例如CPU(Central Processing Unit，中央处理器)，至少一个通信接口503，存储器504，至少一个通信总线502。其中，通信总线502用于实现这些组件之间的连接通信。其中，通信接口503可以包括显示屏(Display)、键盘(Keyboard)，可选通信接口503还可以包括标准的有线接口、无线接口。存储器504可以是高速RAM存储器(Random Access Memory，易挥发性随机存取存储器)，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器。存储器504可选的还可以是至少一个位于远离前述处理器501的存储装置。其中处理器501可以结合图14所描述的装置，存储器504中存储应用程序，且处理器501调用存储器504中存储的程序代码，以用于执行上述任一方法步骤。
其中，通信总线502可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。通信总线502可以分为地址总线、数据总线、控制总线等。为便于表示，图15中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
其中，存储器504可以包括易失性存储器(英文：volatile memory)，例如随机存取存储器(英文：random-access memory，缩写：RAM)；存储器也可以包括非易失性存储器(英文：non-volatile memory)，例如快闪存储器(英文：flash memory)，硬盘(英文：hard disk drive，缩写：HDD)或固态硬盘(英文：solid-state drive，缩写：SSD)；存储器504还可以包括上述种类存储器的组合。
其中，处理器501可以是中央处理器(英文：central processing unit，缩写：CPU)，网络处理器(英文：network processor，缩写：NP)或者CPU和NP的组合。其中，处理器501还可以包括硬件芯片。上述硬件芯片可以是专用集成电路(英文：application-specific integrated circuit，缩写：ASIC)，可编程逻辑器件(英文：programmable logic device，缩写：PLD)或其组合。上述PLD可以是复杂可编程逻辑器件(英文：complex programmable logic device，缩写：CPLD)，现场可编程逻辑门阵列(英文：field-programmable gate array，缩写：FPGA)，通用阵列逻辑(英文：generic array logic,缩写：GAL)或其任意组合。
可选地，存储器504还用于存储程序指令。处理器501可以调用程序 指令，实现如本发明图2至图4实施例中所示的换流器的换相控制方法。
本发明实施例还提供一种计算机程序产品，该计算机程序产品承载有程序代码，所述程序代码包括的指令可用于执行上述方法实施例中所述的交互方法的步骤，可参见上述方法实施例。
其中，上述计算机程序产品可以通过硬件、软件或其结合的方式实现。在一个可选实施例中，所述计算机程序产品体现为计算机存储介质，在另一个可选实施例中，计算机程序产品体现为软件产品，例如软件开发包(Software Devecopment Kit，SDK)等等。
本发明实施例还提供了一种非暂态计算机存储介质，所述计算机存储介质存储有计算机可执行指令，该计算机可执行指令可执行上述任意方法实施例中的换流器的换相控制方法的处理方法。其中，所述存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)、随机存储记忆体(Random Access Memory，RAM)、快闪存储器(Flash Memory)、硬盘(Hard Disk Drive，缩写：HDD)或固态硬盘(Solid-State Drive，SSD)等；所述存储介质还可以包括上述种类的存储器的组合。
虽然结合附图描述了本发明的实施例，但是本领域技术人员可以在不脱离本发明的精神和范围的情况下做出各种修改和变型，这样的修改和变型均落入由所附权利要求所限定的范围之内。
工业实用性
本实施例中，在保证主支路向辅助支路换相成功的基础上，能够通过调节换流器的耗能参数维持换流器所在直流输电系统中的传输功率，避免受端交流系统故障对直流输电系统的影响，保证直流输电系统处于稳定的运行状态。

Claims (17)

  1. 一种换流器的换相控制方法，包括：
    获取换流器的换相状态；
    判断所述换相状态是否正常；
    当所述换相状态异常时，控制所述换流器启动耗能模式，调节所述换流器的耗能参数；其中，所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。
  2. 根据权利要求1所述的方法，其中，所述判断所述换相状态是否正常，至少包括以下一种：
    判断所述换流器对应的受端交流系统是否出现故障；
    判断所述换流器对应的受端交流系统的电力参数值是否下降。
  3. 根据权利要求2所述的方法，其中，所述调节所述换流器的耗能参数，包括：
    获取所述换流器对应的直流输电系统的当前电力参数值；
    判断所述当前电力参数值是否达到预设目标值；
    当所述当前电力参数值未处于所述预设目标值时，基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数。
  4. 根据权利要求3所述的方法，其中，当所述当前电力参数值为直流功率时，所述判断所述当前电力参数值是否达到预设目标值，包括：判断所述当前直流功率是否处于预设目标功率；
    对应地，所述基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数，包括：基于所述当前直流功率与所述预设目标功率之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的传输功率处于恒定。
  5. 根据权利要求3所述的方法，其中，当所述当前电力参数值为直流电压时，所述判断所述当前电力参数值是否达到预设目标值，包括：判断所述当前直流电压是否达到预设目标电压；
    对应地，所述基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数，包括：
    基于所述当前直流电压与所述预设目标电压之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的直流电压处于恒定。
  6. 根据权利要求3至5任一项所述的方法，其中，所述换流器包括换相控制阀，在获取所述换流器对应的直流输电系统的当前电力参数值之前，所述方法还包括：
    判断所述换相控制阀是否被关断；
    当所述换相控制阀被关断时，获取所述换流器对应的直流输电系统的当前电力参数值。
  7. 根据权利要求1所述的方法，其中，所述方法还包括：
    当所述换相状态正常时，获取所述换流器的换相切换时序；
    基于所述换相切换时序控制所述换流器进行主动换相。
  8. 一种换流器的换相控制装置，包括：
    获取模块，配置为获取换流器的换相状态；
    判断模块，配置为判断所述换相状态是否正常；
    调节模块，配置为当所述换相状态异常时，控制所述换流器启动耗能模式，调节所述换流器的耗能参数；所述耗能参数用于维持所述换流器所在直流输电系统中的传输功率。
  9. 根据权利要求8所述的装置，其中，所述判断模块，还至少配置为以下一种：判断所述换流器对应的受端交流系统是否出现故障；判断所述换流器对应的受端交流系统的电力参数值是否下降。
  10. 根据权利要求9所述的装置，其中，所述调节模块，还包括获取子模块、判断子模块和调节子模块，其中：
    获取子模块，配置为获取所述换流器对应的直流输电系统的当前电力参数值；判断子模块，配置为判断所述当前电力参数值是否达到预设目标值；调节子模块，配置为当所述当前电力参数值未处于所述预设目标值时，基于所述当前电力参数值与所述预设目标值之间的差值调节所述换流器的耗能参数。
  11. 根据权利要求10所述的装置，其中，当所述当前电力参数值为直流功率时，所述判断子模块，还配置为：判断所述当前直流功率是否处于预设目标功率；对应地，所述调节子模块，还配置为：基于所述当前直流功率与所述预设目标功率之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的传输功率处于恒定。
  12. 根据权利要求10所述的装置，其中，当所述当前电力参数值为直流电压时，所述判断子模块，还配置为：判断所述当前直流电压是否 达到预设目标电压；对应地，所述调节子模块，还配置为：基于所述当前直流电压与所述预设目标电压之间的差值调节所述换流器的耗能功率，维持所述直流输电系统的直流电压处于恒定。
  13. 根据权利要求10至12任一项所述的装置，其中，所述换流器包括换相控制阀，所述判断模块，还配置为：判断所述换相控制阀是否被关断；当所述换相控制阀被关断时，所述获取模块，还配置为：获取所述换流器对应的直流输电系统的当前电力参数值。
  14. 根据权利要求8所述的装置，其中，当所述换相状态正常时，所述获取模块，还配置为：获取所述换流器的换相切换时序；所述装置还包括：换相模块，配置为基于所述换相切换时序控制所述换流器进行主动换相。
  15. 一种电子设备，包括：
    存储器和处理器，所述存储器和所述处理器之间互相通信连接，所述存储器中存储有计算机指令，所述处理器通过执行所述计算机指令，从而执行权利要求1至7任一项所述的换流器的换相控制方法。
  16. 一种计算机可读存储介质，所述计算机可读存储介质存储有计算机指令，所述计算机指令用于使计算机执行权利要求1至7任一项所述的换流器的换相控制方法。
  17. 一种计算机程序产品，所述计算机程序产品包括一条或多条指令，所述一条或多条指令适于由处理器加载并执行如权利要求1至7任一项所述的换流器的换相控制方法。
PCT/CN2022/122633 2021-11-16 2022-09-29 换流器的换相控制方法、装置、电子设备及可读存储介质 WO2023087946A1 (zh)

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