Inverter commutation control method, device, electronic device and readable storage medium

Abstract

The present invention relates to the technical field of direct current transmission systems, and discloses a commutation control method, device, electronic device and readable storage medium of a converter. The method comprises: obtaining the commutation state of the converter; judging whether the commutation state is normal; when the commutation state is abnormal, controlling the converter to start the energy consumption mode and adjusting the energy consumption parameters of the converter. By implementing the present invention, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, the transmission power in the direct current transmission system where the converter is located can be maintained by adjusting the energy consumption parameters of the converter, avoiding the influence of the receiving end AC fault on the direct current transmission system, and ensuring that the direct current transmission system is in a stable operating state.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current transmission systems, and in particular to a commutation control method, device, electronic equipment and readable storage medium for a converter. Background Art

[0002] 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. In the case of AC system failure, commutation failure is prone to occur, resulting in a surge in DC current and a rapid and large loss of DC transmission power. The switching device IGBT used in flexible DC transmission (VSC-HVDC) has the ability to control the switch, and its DC transmission has basically never had commutation failure problems.

[0003] In order to solve the problem of commutation failure in LCC-HVDC transmission system, a controllable commutation converter combining the advantages of LCC converter and VSC converter has been proposed. Figure 1 As shown, each 6-pulse commutation bridge is composed of a main branch and an auxiliary branch in parallel. The main branch is composed of the original conventional thyristor valve and the low-voltage IGBT valve in series, and the auxiliary branch is composed of a high-voltage low-current IGBT valve and a high-voltage low-current thyristor valve in series. Therefore, whether in steady state or during AC fault, the bridge arm current can be controlled, and the commutation failure problem can be solved to the greatest extent. However, when the commutation failure is caused by the AC fault at the receiving end, even if the controllable commutation converter can avoid the commutation failure, the transmission power of the entire DC transmission system will still decrease, affecting the operating stability of the DC transmission system. Summary of the invention

[0004] In view of this, the embodiments of the present invention provide a commutation control method, device, electronic device and readable storage medium of a converter to avoid the problem that the stability of DC system operation is affected due to commutation failure caused by AC fault at the receiving end.

[0005] According to the first aspect, an embodiment of the present invention provides a commutation control method for a converter, comprising: obtaining the commutation state of the converter; determining whether the commutation state is normal; when the commutation state is abnormal, controlling the converter to start an energy consumption mode and adjusting the energy consumption parameters of the converter.

[0006] The commutation control method of the converter provided in the embodiment of the present invention obtains the commutation state of the converter to determine whether the commutation state is normal. When the commutation state is abnormal, the converter is controlled to start the energy consumption mode and the energy consumption parameters of the converter are adjusted. Thus, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, the transmission power in the DC transmission system where the converter is located can be maintained by adjusting the energy consumption parameters of the converter, thereby avoiding the influence of the receiving end AC fault on the DC transmission system, and ensuring that the DC transmission system is in a stable operating state.

[0007] In combination with the first aspect, in a first implementation of the first aspect, the judging whether the commutation state is normal includes: judging whether a fault occurs in the receiving-end AC system corresponding to the converter; and / or judging whether a power parameter value of the receiving-end AC system corresponding to the converter decreases.

[0008] The commutation control method of the converter provided in the embodiment of the present invention determines whether the commutation state is normal by judging whether a fault occurs in the receiving-end AC system corresponding to the converter; and / or whether the power parameter value of the receiving-end AC system decreases, thereby ensuring that the energy consumption mode is turned on in time and avoiding the abnormal commutation state from affecting the stable operation of the DC transmission system.

[0009] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the adjusting the energy consumption parameters of the converter includes: obtaining a current power parameter value of a DC power transmission system corresponding to the converter; determining whether the current power parameter value is within a preset target value; when the current power parameter value is not within the preset target value, adjusting the energy consumption parameters of the converter based on the difference between the current power parameter value and the preset target value.

[0010] In combination with the second implementation manner of the first aspect, in the third implementation manner of the first aspect, when the current power parameter value is DC power, the judging whether the current power parameter value reaches the preset target value includes: judging whether the current DC power is at the preset target power; the adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value includes: adjusting the energy consumption power of the converter based on the difference between the current DC power and the preset target power to maintain the transmission power of the DC transmission system constant.

[0011] In combination with the second embodiment of the first aspect, in the fourth embodiment of the first aspect, when the current power parameter value is a DC voltage, the judging whether the current power parameter value reaches the preset target value includes: judging whether the current DC voltage reaches the preset target voltage; the adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value includes: adjusting the energy consumption power of the converter based on the difference between the current DC voltage and the preset target voltage to maintain the DC voltage of the DC transmission system constant.

[0012] The commutation control method of the converter provided in the embodiment of the present invention obtains the current power parameter value of the DC transmission system corresponding to the converter, and when the current power parameter value is not at the preset target value, adjusts the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value, so that the current power parameter can be maintained at the preset target value, thereby maintaining the transmission power balance and DC voltage stability of the DC transmission system, improving the operating stability of the DC transmission system, and thus improving the stable operation of the power grid.

[0013] In combination with any one of the second to fourth embodiments of the first aspect, in the fifth embodiment of the first aspect, the converter includes a phase-changing control valve, and before obtaining the current power parameter value of the DC transmission system corresponding to the converter, it also includes: determining whether the phase-changing control valve is closed; when the phase-changing control valve is closed, obtaining the current power parameter value of the DC transmission system corresponding to the converter.

[0014] The commutation control method of the converter provided in the embodiment of the present invention determines whether the commutation control valve is closed. When the commutation control valve is closed, the current power parameter value of the DC power transmission system corresponding to the converter is obtained, so as to monitor the power parameters corresponding to the DC power transmission system during the commutation process of the converter in real time, so as to facilitate determining the operating state of the DC power transmission system during the commutation process.

[0015] In combination with the first aspect, in a sixth implementation of the first aspect, the method further includes: when the commutation state is normal, obtaining a commutation switching timing of the converter; and controlling the converter to perform active commutation based on the commutation switching timing.

[0016] The commutation control method for the converter provided in the embodiment of the present invention obtains the commutation switching timing of the converter when the commutation state of the converter is normal, and controls the active commutation between the main branch and the auxiliary branch of the converter based on the commutation switching timing, thereby enabling the converter to actively commutate according to the established commutation switching timing in the normal commutation state, thereby further ensuring the stable operation of the DC transmission system.

[0017] According to the second aspect, an embodiment of the present invention provides a commutation control device of a converter, comprising: an acquisition module for acquiring the commutation state of the converter; a judgment module for judging whether the commutation state is normal; and an adjustment module for controlling the converter to start an energy consumption mode and adjust the energy consumption parameters of the converter when the commutation state is abnormal.

[0018] The commutation control device of the converter provided in the embodiment of the present invention obtains the commutation state of the converter to determine whether the commutation state is normal. When the commutation state is abnormal, the converter is controlled to start the energy consumption mode and adjust the energy consumption parameters of the converter. Therefore, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, the transmission power in the DC transmission system where the converter is located can be maintained by adjusting the energy consumption parameters of the converter, thereby avoiding the influence of the receiving end AC fault on the DC transmission system, and ensuring that the DC transmission system is in a stable operating state.

[0019] According to the third aspect, an embodiment of the present invention provides an electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the commutation control method of the converter described in the first aspect or any embodiment of the first aspect by executing the computer instructions.

[0020] According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the commutation control method of the converter described in the first aspect or any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The structure topology diagram of the controllable commutation converter in the embodiment of the present invention is shown;

[0023] Figure 2 is a flow chart of a commutation control method of a converter according to an embodiment of the present invention;

[0024] Figure 3 is another flow chart of a commutation control method of a converter according to an embodiment of the present invention;

[0025] Figure 4is another flow chart of a commutation control method of a converter according to an embodiment of the present invention;

[0026] Figure 5 is a switching timing diagram between a main branch and an auxiliary branch according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of switching between a main branch and an auxiliary branch according to an embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of the converter output before and after the energy consumption mode is started according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of closed-loop control of transmission power according to an embodiment of the present invention;

[0030] Fig. 9 is a schematic diagram of closed-loop control of a DC voltage according to an embodiment of the present invention;

[0031] Fig.10 is a voltage / current waveform diagram of a converter valve on each side of a converter according to an embodiment of the present invention;

[0032] Fig.11 is a schematic diagram of the phase switching timing of the main branch and the auxiliary branch according to an embodiment of the present invention;

[0033] Fig.12 is a schematic diagram of a receiving-end AC system failure not starting an energy consumption mode according to an embodiment of the present invention;

[0034] Fig.13 is a schematic diagram of a receiving-end AC system failure startup energy consumption mode according to an embodiment of the present invention;

[0035] Fig.14 is a structural block diagram of a commutation control device for a converter according to an embodiment of the present invention;

[0036] Fig.15 It is a schematic diagram of the hardware structure of the converter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] The controllable commutation converter can combine the advantages of LCC converter and VSC converter. It can realize the controllable bridge arm current in both steady state and AC fault period, and solve the commutation failure problem to the greatest extent. However, when the commutation failure is caused by the AC fault at the receiving end, even if the controllable commutation converter can avoid the commutation failure, the transmission power of the entire DC transmission system will still decrease, making it difficult to ensure the operation stability of the DC transmission system.

[0039] Based on this, 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 at a constant value, thereby ensuring that the DC transmission system maintains stable operation when the DC transmission system is subjected to AC disturbances at the receiving end.

[0040] According to an embodiment of the present invention, an embodiment of a commutation control method of a converter is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0041] In this embodiment, a commutation control method for a converter is provided, which can be used in electronic equipment, such as a controllable commutation converter, etc. Figure 1 Taking the controllable commutated converter shown in the figure as an example, Figure 2 is a flow chart of a commutation control method of a converter according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0042] S11, obtaining the commutation state of the converter.

[0043] The commutation state is used to characterize the power supply status of the DC power transmission system during the commutation process of the converter. The controllable commutation converter can detect the power transmission status of the DC power transmission system during its commutation process in real time to determine the current commutation state.

[0044] S12, judging whether the commutation state is normal.

[0045] The controllable commutation converter can determine whether its commutation state is normal according to the power transmission situation of the DC power transmission system. If the commutation state is abnormal, step S13 is executed, otherwise active commutation from the main branch to the auxiliary branch is performed according to the normal commutation state.

[0046] S13, controlling the converter to start the energy consumption mode and adjusting the energy consumption parameters of the converter.

[0047] The energy consumption mode is used to trigger the commutation operation in advance, and the energy consumption parameters are the operating parameters of the converter in the energy consumption mode. When an abnormality is detected in the power transmission of the DC transmission system, it can be determined that the commutation state of the converter is abnormal. At this time, in order to ensure the normal operation of the DC transmission system, the controllable commutation converter can start the energy consumption mode to trigger the commutation operation from the main branch to the auxiliary branch in advance, 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.

[0048] Specifically, the controllable commutation converter operates in an inverter mode. The controllable commutation converter includes 6 commutation bridge arms, each of which 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 connected in series, and the auxiliary branch is composed of a high-voltage, low-current IGBT valve and a high-voltage, low-current thyristor valve connected in series. Figure 1 When the energy consumption mode of the controllable commutation converter is started, the trigger time of the auxiliary branch of the controllable commutation converter is advanced, and its working mode is switched to the energy consumption mode. The switching sequence between the main branch and the auxiliary branch is as follows: Figure 5 As shown, the switching diagram is as follows Figure 6 When 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. At this time, the DC current (voltage) output by the controllable commutation converter is raised, and the excess DC power will be consumed by MOV1. Thus, the energy consumption mode is used to maintain the normal power transmission of the DC transmission system during the commutation process. The DC voltage and valve voltage waveforms of the converter output before and after the energy consumption mode is started are shown in Figure 7 shown.

[0049] The commutation control method of the converter provided in this embodiment obtains the commutation state of the converter to determine whether the commutation state is normal. When the commutation state is abnormal, the converter is controlled to start the energy consumption mode and adjust the energy consumption parameters of the converter. Therefore, on the basis of ensuring the successful commutation from the main branch to the auxiliary branch, the transmission power in the DC transmission system where the converter is located can be maintained by adjusting the energy consumption parameters of the converter, thereby avoiding the influence of the receiving end AC fault on the DC transmission system, and ensuring that the DC transmission system is in a stable operating state.

[0050] In this embodiment, a commutation control method for a converter is provided, which can be used in electronic equipment, such as a controllable commutation converter, etc. Figure 3 is a flow chart of a commutation control method of a converter according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0051] S21, obtaining the commutation state of the converter. For detailed description, please refer to the relevant description of step S11 in the above embodiment, which will not be repeated here.

[0052] S22, judging whether the commutation state is normal.

[0053] Specifically, the above step S22 includes: determining whether a fault occurs in the receiving-end AC system corresponding to the converter; and / or determining whether a power parameter value of the receiving-end AC system corresponding to the converter decreases.

[0054] The receiving-end AC system refers to the regional power grid at one end of the main grid that mainly receives electricity. When the receiving-end AC system fails or the current parameter values ​​such as voltage and current drop, it will directly cause the power transmission of the DC transmission system to be damaged, and then bring adverse effects to the sending-end system connected to the DC transmission system. Therefore, when performing the commutation operation, it is necessary to detect in real time whether the receiving-end AC system corresponding to the converter fails and / or whether the power parameter values ​​of the receiving-end AC system corresponding to the converter drop.

[0055] When a fault occurs in the receiving-end AC system or the power parameter value of the receiving-end AC system decreases, step S23 is executed; otherwise, the normal commutation operation continues.

[0056] S23, controlling the converter to start the energy consumption mode and adjusting the energy consumption parameters of the converter.

[0057] Specifically, the above step S23 includes:

[0058] S231, determine whether the phase change control valve is closed.

[0059] The phase change control valve is set on the auxiliary branch, such as Figure 1 The IGBT valve shown is the phase-changing control valve. When the working mode of the converter is switched to the energy consumption mode, the phase-changing operation from the main branch to the auxiliary branch will be triggered in advance. At this time, the controllable phase-changing converter can detect in real time whether the phase-changing control valve is closed. When it is detected that the phase-changing control valve is closed, step S232 is executed, otherwise the closed state of the phase-changing control valve continues to be detected.

[0060] S232, obtaining a current power parameter value of the direct current transmission system corresponding to the converter.

[0061] The current power parameter value is used to characterize the current operating state of the DC power transmission system, which may include DC voltage, DC power, and of course DC current. The power parameters are not specifically limited here, and those skilled in the art may determine them according to actual needs.

[0062] When the commutation control valve is closed, it means that the controllable commutation converter is in commutation operation under energy consumption mode. In order to ensure that the DC transmission system will not be disturbed by the receiving AC system, the controllable commutation converter can detect the current power parameter value of the DC transmission system corresponding to the converter in real time, so as to adjust the energy consumption parameters of the converter in time when the power parameter value of the DC transmission system is abnormal.

[0063] S233, determining whether the current power parameter value is within the preset target value.

[0064] 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 within the preset target value. If the current power parameter value is not within the preset target value, execute step S234; otherwise, maintain the working state of the converter and detect changes in the current power parameter value in real time.

[0065] S234, adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value.

[0066] The energy consumption parameters are operating parameters of the converter when it is in the energy consumption mode, such as energy consumption power, energy consumption voltage, etc. When the current power parameter value is not at the preset target value, 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 so that the power parameter value of the DC transmission system reaches the preset target value.

[0067] Optionally, if the current power parameter value is DC power, the above steps S232-S234 may include:

[0068] (1) Obtain the current DC power of the DC transmission system corresponding to the converter.

[0069] 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 set on the DC power transmission system side, or calculated from the current value and voltage value obtained on the DC power transmission system side. Of course, it can also be obtained by other methods, which are not specifically limited here.

[0070] (2) Determine whether the current DC power is within the preset target power.

[0071] 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 within the preset target power. If the current DC power is not within the preset target power, execute step (3); otherwise, maintain the working state of the converter and detect the change of the current DC power in real time.

[0072] (3) Based on the difference between the current DC power and the preset target power, the energy consumption of the converter is adjusted to maintain the transmission power of the DC transmission system constant.

[0073] 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 power value and the preset target power. Specifically, if the preset target power is P0 and 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 inputs, and calculates the difference between the two to form a closed-loop control to maintain the transmission power of the DC transmission system at a constant value, such as Figure 8 shown.

[0074] Optionally, if the current power parameter value is a DC voltage, the above steps S232-S234 may include:

[0075] (1) Obtain the current DC voltage of the DC transmission system corresponding to the converter.

[0076] The controllable commutation converter can detect the current DC voltage of the DC power transmission system corresponding to the converter in real time. The DC voltage can be obtained by a voltage detection device provided on the DC power transmission system side, such as a voltmeter, or by other means or other devices, which are not specifically limited here.

[0077] (2) Determine whether the current DC voltage reaches the preset target voltage.

[0078] 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 within the preset target voltage. If the current DC voltage is not within the preset target voltage, execute step (3); otherwise, maintain the working state of the converter and detect the change of the current DC voltage in real time.

[0079] (3) Based on the difference between the current DC voltage and the preset target voltage, the energy consumption of the converter is adjusted to maintain the DC voltage of the DC transmission system at a constant level.

[0080] 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 as to maintain the DC voltage of the DC transmission system at the preset target voltage, that is, to maintain its DC voltage at a constant value. Specifically, if the preset target voltage is Ud0 and 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 a closed-loop control to maintain the DC voltage of the DC transmission system at a constant value by calculating the difference between the two, such as Fig. 9 shown.

[0081] The commutation control method of the converter provided in this embodiment determines whether the commutation state is normal by judging whether the converter fails; and / or judging whether the power parameter value of the DC system corresponding to the converter decreases, thereby ensuring that the energy consumption mode is turned on in time, and avoiding the abnormal commutation state from affecting the stable operation of the DC transmission system. By judging whether the commutation control valve is closed, when the commutation control valve is closed, the current power parameter value of the DC transmission system corresponding to the converter is obtained, so as to monitor the power parameter corresponding to the DC transmission system during the commutation process of the converter in real time, so as to determine the operating state of the DC transmission system during the commutation process. By obtaining the current power parameter value of the DC transmission system corresponding to the converter, when the current power parameter value is not at the preset target value, the energy consumption parameter of the converter is adjusted based on the difference between the current power parameter value and the preset target value, so that the current power parameter can be maintained at the preset target value, thereby maintaining the balance of the transmission power of the DC transmission system and the stability of the DC voltage, improving the operating stability of the DC transmission system, and thus improving the stable operation of the power grid.

[0082] In this embodiment, a commutation control method for a converter is provided, which can be used in electronic equipment, such as a controllable commutation converter, etc. Figure 4 is a flow chart of a commutation control method of a converter according to an embodiment of the present invention. Figure 4 As shown, the process includes the following steps:

[0083] S31, obtaining the commutation state of the converter. For detailed description, please refer to the relevant description of step S11 in the above embodiment, which will not be repeated here.

[0084] S32, judging whether the commutation state is normal. For detailed description, please refer to the relevant description of step S12 in the above embodiment, which will not be repeated here.

[0085] 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. For detailed description, please refer to the relevant description of step S13 in the above embodiment, which will not be repeated here.

[0086] S34, when the commutation state is normal, obtaining the commutation switching timing of the converter.

[0087] The commutation switching sequence is the switching sequence of the main branch to the auxiliary branch in the bridge arm commutation valve for active commutation. When the commutation state is normal, the controllable commutation converter does not start the energy consumption mode, and the controllable commutation converter is in a normal commutation state. Each commutation valve in the controllable commutation converter is in a controllable off state, such as Fig.10 The voltage and current waveforms of the converter valves (V1, V3, V5, V2, V4, V6) on each side of the converter are shown in FIG. When the commutation state is normal, the controllable commutation converter can obtain the commutation switching timing of the main branch and the auxiliary branch in the converter valve, such as Fig.11 shown.

[0088] S35, controlling the converter to perform active commutation based on the commutation switching timing.

[0089] By obtaining the commutation switching timing of the main branch and the auxiliary branch, the main branch and the auxiliary branch in the controllable commutation valve are controlled to perform normal commutation. The commutation valves with the same odd or even numbers between the adjacent phases of the commutation valves (V1, V3, V5, V2, V4, V6) on each side of the controllable commutation converter perform normal commutation according to the commutation switching timing, for example, V1 and V3 commutate, V3 and V5 commutate, and so on.

[0090] Take a DC project as an example. The rated DC voltage of the project is Udc = ±800kV, the rated DC power is 8000MW, and the inverter side converter adopts a controllable phase-changing converter. When a single-phase grounding fault occurs in the receiving-end AC system, if the energy consumption mode is not started, the DC power of the DC transmission system decreases after a single-phase grounding fault occurs in the receiving-end AC system. The receiving-end AC voltage, DC power and inverter valve voltage are as follows: Fig.12 As shown in the figure; if the energy consumption mode is started and a closed-loop control is adopted to maintain the transmission power of the DC transmission system at a constant value, the DC power remains constant after a single-phase grounding fault occurs in the AC system at the receiving end. The AC voltage, DC power and inverter valve voltage at the receiving end are as follows: Fig.13 shown.

[0091] The commutation control method for the converter provided in this embodiment obtains the commutation switching timing of the converter when the commutation state of the converter is normal, and controls the active commutation between the main branch and the auxiliary branch of the converter based on the commutation switching timing, thereby enabling the converter to actively commutate according to the established commutation switching timing in the normal commutation state, thereby further ensuring the stable operation of the DC transmission system.

[0092] In this embodiment, a commutation control device for a converter is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0093] This embodiment provides a commutation control device for a converter, such as Fig.14 As shown, including:

[0094] The acquisition module 41 is used to acquire the commutation state of the converter. For detailed description, please refer to the relevant description of the corresponding steps in the above method embodiment, which will not be repeated here.

[0095] The judging module 42 is used to judge whether the commutation state is normal. For detailed description, please refer to the relevant description of the corresponding steps in the above method embodiment, which will not be repeated here.

[0096] The adjustment module 43 is used 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 detailed description, please refer to the relevant description of the corresponding steps in the above method embodiment, which will not be repeated here.

[0097] The commutation control device for the converter provided in this embodiment obtains the commutation state of the converter to determine whether the commutation state is normal. When the commutation state is abnormal, the converter is controlled to start the energy consumption mode and adjust the energy consumption parameters of the converter. Therefore, on the basis of ensuring successful commutation from the main branch to the auxiliary branch, the transmission power in the DC transmission system where the converter is located can be maintained by adjusting the energy consumption parameters of the converter, thereby ensuring that the DC transmission system is in a stable operating state.

[0098] 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, a processor and a memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0099] The further functional description of each of the above modules is the same as that of the above corresponding embodiments and will not be repeated here.

[0100] The embodiment of the present invention also provides an electronic device having the above Fig.14 The commutation control device of the converter is shown.

[0101] See also Fig.15 , Fig.15 is a schematic diagram of the structure of an electronic device provided by an optional embodiment of the present invention, such as Fig.15 As shown, the electronic device may include: at least one processor 501, such as a CPU (Central Processing Unit), at least one communication interface 503, a memory 504, and at least one communication bus 502. The communication bus 502 is used to realize the connection and communication between these components. The communication interface 503 may include a display screen (Display), 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) or a non-volatile memory (non-volatile memory), such as at least one disk storage. The memory 504 may optionally be at least one storage device located away from the aforementioned processor 501. The processor 501 may be combined with Fig.14In the described device, the memory 504 stores an application program, and the processor 501 calls the program code stored in the memory 504 to execute any of the above method steps.

[0102] The communication bus 502 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The communication bus 502 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.15 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0103] Among them, the memory 504 may include a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviated: RAM); the memory may also include a non-volatile memory (English: non-volatile memory), such as a flash memory (English: flash memory), a hard disk drive (English: hard disk drive, abbreviated: HDD) or a solid-state drive (English: solid-state drive, abbreviated: SSD); the memory 504 may also include a combination of the above types of memory.

[0104] The processor 501 may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and a NP.

[0105] The processor 501 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.

[0106] Optionally, the memory 504 is also used to store program instructions. The processor 501 can call the program instructions to implement the present application Figures 2 to 4 The commutation control method of the converter shown in the embodiment.

[0107] The embodiment of the present invention further provides a non-transitory computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the processing method of the commutation control method of the converter in any of the above method embodiments. The storage medium may be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk (HDD) or a solid-state drive (SSD), etc.; the storage medium may also include a combination of the above types of memories.

[0108] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A commutation control method for a converter, characterized in that: include: Obtain the commutation state of the inverter; Determining whether the commutation state is normal; When the commutation state is abnormal, controlling the converter to start an energy consumption mode and adjusting the energy consumption parameters of the converter; Wherein, adjusting the energy consumption parameters of the converter includes: Obtaining a current power parameter value of a direct current power transmission system corresponding to the converter; Determining whether the current power parameter value is within a preset target value; When the current power parameter value is not within the preset target value, the energy consumption parameter of the converter is adjusted based on the difference between the current power parameter value and the preset target value.

2. The method according to claim 1, characterized in that The determining whether the commutation state is normal includes: Determining whether a receiving-end AC system corresponding to the converter fails; and / or, Determine whether the power parameter value of the receiving-end AC system corresponding to the converter decreases.

3. The method according to claim 2, characterized in that When the current power parameter value is DC power, determining whether the current power parameter value reaches a preset target value includes: Determine whether the current DC power is within the preset target power; The adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value comprises: The energy consumption power of the converter is adjusted based on the difference between the current DC power and the preset target power to maintain the transmission power of the DC power transmission system constant.

4. The method according to claim 2, characterized in that: When the current power parameter value is a DC voltage, determining whether the current power parameter value reaches a preset target value includes: Determine whether the current DC voltage reaches the preset target voltage; The adjusting the energy consumption parameter of the converter based on the difference between the current power parameter value and the preset target value comprises: The energy consumption power of the converter is adjusted based on the difference between the current DC voltage and the preset target voltage to maintain the DC voltage of the DC power transmission system constant.

5. The method according to any one of claims 2 to 4, characterized in that: The converter includes a phase change control valve, and before obtaining the current power parameter value of the direct current power transmission system corresponding to the converter, the method further includes: Determining whether the phase change control valve is turned off; When the phase-changing control valve is turned off, a current power parameter value of the direct current power transmission system corresponding to the converter is obtained.

6. The method according to claim 1, characterized in that Also includes: When the commutation state is normal, obtaining the commutation switching timing of the converter; The converter is controlled to perform active commutation based on the commutation switching timing.

7. A commutation control device for a converter, characterized in that: include: An acquisition module, used for acquiring a commutation state of a converter; A judging module, used for judging whether the commutation state is normal; The regulating module is used 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, wherein the adjusting the energy consumption parameters of the converter includes: Obtaining a current power parameter value of a direct current power transmission system corresponding to the converter; Determining whether the current power parameter value is within a preset target value; When the current power parameter value is not within the preset target value, the energy consumption parameter of the converter is adjusted based on the difference between the current power parameter value and the preset target value.

8. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the commutation control method of the converter according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the commutation control method of the converter according to any one of claims 1 to 6.

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