Reactive power adjusting method of active commutation current source type current converter

Abstract

The invention relates to a reactive power regulation method for a current source type converter capable of active commutation, and the method comprises the steps: firstly controlling the current source type converter capable of active commutation to be in a target active power mode under the condition that the operation states of a DC power transmission system and an AC system connected with the DC power transmission system meet a preset judgment condition; determining a target reactive power needing to be adjusted when the active power mode of the active commutation current source type converter is in the active power mode, obtaining a target mapping relation corresponding to the target active power mode, and finally adjusting the tap position of the converter transformer according to the target reactive power and the target mapping relation. The reactive power exchanged between the current source type current converter capable of active commutation and the alternating current system connected with the current source type current converter capable of active commutation reaches the target reactive power. According to the method, the problem of active power change caused by directly adjusting the trigger angle or turn-off angle of the current source type current converter capable of active commutation in the prior art can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a reactive power regulation method for a current source converter capable of active commutation. Background Art

[0002] High-voltage direct current transmission systems (HVDC) play a vital role in power systems, especially in long-distance and large-capacity power transmission. By converting alternating current (AC) into direct current (DC), HVDC systems effectively reduce energy losses during long-distance transmission and improve transmission efficiency. However, under certain working conditions, there may be an imbalance between the converter and the AC system due to insufficient or excessive reactive power supply, which may cause voltage fluctuations and affect the stability of the power system and the normal operation of equipment. Therefore, it is crucial to effectively adjust the reactive power balance in the HVDC system to ensure the stable operation and efficient transmission of the power system.

[0003] When the DC system is running at low power, the reactive power compensated by the AC filter often exceeds the reactive power absorbed by the converter. At present, the method of adjusting the reactive power balance is to adjust the trigger angle or shutdown angle of the converter through the reactive auxiliary control function (Quadrature Power Control, QPC) of the pole control system in the high-voltage DC transmission project, so that the converter itself absorbs more reactive power to avoid excessive AC bus voltage. However, since traditional current source grid-commutated converters will have commutation failure accidents under low shutdown angle conditions, it is impossible to provide reactive power support for the AC system through the QPC function. In addition, QPC will cause changes in active power while adjusting reactive power, and it is impossible to achieve decoupling control of active power and reactive power.

[0004] As a core component of future HVDC systems, the current source converter with active commutation based on fully controlled devices has shown significant technical advantages. The device realizes controllable commutation by controlling the active shutdown of the fully controlled devices of the bridge arm. It not only has the ability to resist commutation failure caused by AC side faults, but also can achieve stable operation under low shutdown angle conditions and has a wide range of shutdown angle operation characteristics. However, the reactive power control technology of the existing current source converter with active commutation still uses the traditional QPC mode, and fails to fully tap the potential advantages of the current source converter with active commutation to realize reactive power support and active / reactive power decoupling control of the AC system under the wide range of shutdown angle operation characteristics. Summary of the invention

[0005] Based on this, it is necessary to provide a reactive power regulation method for an active commutation current source converter that can realize reactive power support for the AC system and decouple reactive power from active power in order to address the above technical problems.

[0006] In a first aspect, the present application provides a reactive power regulation method for a current source converter capable of active commutation, the method comprising:

[0007] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0008] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0009] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0010] In one embodiment, adjusting the converter transformer tap position according to the target reactive power and the target mapping relationship includes:

[0011] According to the target mapping relationship, determining the target gear position of the converter transformer tap corresponding to the target reactive power;

[0012] Adjust the converter transformer tap position to the target position.

[0013] In one embodiment, the method further comprises:

[0014] Construct an analytical model of the AC and DC systems of the DC transmission system;

[0015] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained;

[0016] According to the corresponding relationship between different gears and different reactive powers, a preset mapping relationship is determined.

[0017] In one embodiment, constructing an AC / DC system analytical model of a DC power transmission system includes:

[0018] Obtain system related parameters of the DC transmission system;

[0019] Construct an analytical model of the AC / DC system based on system-related parameters.

[0020] In one of the embodiments, the system-related parameters include at least one of the parameters of the current source converter capable of active commutation, the parameters of the converter transformer and the AC side system parameters.

[0021] In one embodiment, the AC / DC system analytical model is used to simulate the gear adjustment according to different gears of the converter transformer tap to obtain the reactive power consumed by the current source converter capable of active commutation corresponding to each gear, including:

[0022] Determine different gears of converter transformer taps under different active powers;

[0023] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap under each active power, and the reactive power consumed by the current source converter with active commutation corresponding to each gear under different active power is obtained.

[0024] In a second aspect, the present application further provides a reactive power regulating device for a current source converter capable of active commutation, the device comprising:

[0025] A monitoring module, configured to control the active commutation current source converter to be in a target active power mode when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition;

[0026] An acquisition module is used to determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in the active power mode, and to acquire a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0027] The regulating module is used to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship so that the reactive power exchanged between the actively commutating current source converter and the AC system connected to the actively commutating current source converter reaches the target reactive power.

[0028] In a third aspect, the present application further provides a control device, the control device comprising a memory and a processor, the memory storing a control program, and the processor implementing the following steps when executing the control program:

[0029] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0030] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0031] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0032] In a fourth aspect, the present application further provides a readable storage medium, on which a control program is stored, and when the control program is executed by a processor, the following steps are implemented:

[0033] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0034] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0035] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0036] In a fifth aspect, the present application further provides a control program product, the control program product comprising a control program, and when the control program is executed by a processor, the following steps are implemented:

[0037] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0038] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0039] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0040] The reactive power regulation method of the above-mentioned active commutation current source converter, when monitoring that the operating status of the DC transmission system and the AC system connected to the DC transmission system meets the preset judgment conditions, first controls the active commutation current source converter to be in the target active power mode, then determines the target reactive power that needs to be adjusted when the active commutation current source converter is in the active power mode, and obtains the target mapping relationship corresponding to the target active power mode, and finally adjusts the converter transformer tap position according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power. Among them, the target mapping relationship represents the corresponding relationship between the converter transformer tap position and the target reactive power. In the above method, by controlling the active commutation current source converter to be in the target active power mode, the system active transmission can be kept unchanged, and then the reactive power can be adjusted by adjusting the converter transformer tap position, which can avoid the problem of active power change caused by directly adjusting the trigger angle or cut-off angle of the active commutation current source converter. The above method can ensure that the active power is not changed when adjusting the reactive power, and realize the active-reactive decoupling control of the converter. In addition, since HCC has the characteristics of a wide range of cut-off angle operation, the reactive power adjustment range of the above method is larger than that of QPC, which can absorb the surplus reactive power of the AC system and provide reactive support for the AC system. And the reactive power adjustment range of the above method can be changed by changing the rated cut-off angle of the converter: the larger the rated cut-off angle of the converter, the more reactive power support the above method can provide to the AC system; the smaller the rated cut-off angle of the converter, the more surplus reactive power the above method can absorb from the AC system. It helps to reduce the configuration capacity of AC filters / capacitor banks / reactive compensation devices in converter stations and improve the construction economy and operational flexibility of high-voltage DC transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of the structure of an application environment in an embodiment;

[0042] Figure 2 A topological diagram of a current source converter (twelve-pulse hybrid commutation converter) capable of active commutation;

[0043] Figure 3 One of the flow charts of a reactive power regulation method of a current source converter capable of active commutation in one embodiment;

[0044] Figure 4 The second flowchart of a reactive power regulation method of a current source converter capable of active commutation in one embodiment;

[0045] Figure 5 The third flowchart of a reactive power regulation method of a current source converter capable of active commutation in one embodiment;

[0046] Figure 6 FIG4 is a flow chart of a reactive power regulation method of a current source converter capable of active commutation in one embodiment;

[0047] Figure 7 FIG5 is a flowchart of a reactive power regulation method of a current source converter capable of active commutation in one embodiment;

[0048] Figure 8 A block diagram of a reactive power regulating device of a current source type converter capable of active commutation in one embodiment;

[0049] Fig. 9 FIG. 4 is a diagram showing the internal structure of a control device in one embodiment. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0051] High-voltage direct current transmission (HVDC) plays a vital role in the power system, especially in long-distance and large-capacity power transmission. By converting alternating current (AC) into direct current (DC), the HVDC system effectively reduces energy loss during long-distance transmission and improves transmission efficiency. However, under certain working conditions, there may be an imbalance of insufficient or excessive reactive power supply between the converter and the AC system, which may cause voltage fluctuations and affect the stability of the power system and the normal operation of the equipment. Therefore, it is crucial to effectively adjust the reactive power balance in the HVDC system to ensure the stable operation and high-efficiency transmission of the power system. At present, the method of adjusting the reactive power balance is to adjust the trigger angle or the cut-off angle of the converter through the reactive auxiliary control function (Quadrature Power Control, referred to as QPC) of the pole control system in the high-voltage direct current transmission project, so that the converter itself absorbs more reactive power and reduces the pressure on the AC system. However, since the traditional current source grid-commutated converter will have a commutation failure accident under low cut-off angle conditions, it is impossible to provide reactive support for the AC system through the QPC function. In addition, QPC will cause changes in active power while adjusting reactive power, and it is impossible to achieve decoupling control of active power and reactive power. As a core component of future HVDC systems, current source converters with active commutation based on fully controlled devices show significant technical advantages. The device achieves controllable commutation by controlling the active shutdown of the fully controlled devices of the bridge arm. It not only has the ability to resist commutation failure caused by AC side faults, but also can achieve stable operation under low shutdown angle conditions and has a wide range of shutdown angle operation characteristics. However, the reactive control technology of existing current source converters with active commutation still uses the traditional QPC mode, and fails to fully tap the potential advantages of current source converters with active commutation to achieve reactive power support and active / reactive power decoupling control of the AC system under the wide range of shutdown angle operation characteristics.

[0052] The present application provides a reactive power regulation method for a current source type converter capable of active commutation, aiming to solve the above-mentioned technical problems. The following embodiments will specifically illustrate the reactive power regulation method for a current source type converter capable of active commutation described in the present application.

[0053] The reactive power regulation method of the current source converter capable of active commutation provided in the embodiment of the present application can be applied to Figure 1In the application environment shown, the application environment includes a high-voltage direct current transmission system 10 and an alternating current system 20, and the alternating current side of the high-voltage direct current transmission system 10 is connected to the alternating current system 20 through an alternating current line. Among them, the high-voltage direct current transmission system 10 includes a control device 101, a current source type converter 102 capable of active commutation, and a direct current transmission line 103, and the current source type converter 102 capable of active commutation includes a converter bridge 1021, an equivalent commutation reactance 1022 of the converter, and a converter transformer 1023. The bridge arm of the current source type converter 102 capable of active commutation includes a fully controlled device, and active commutation of the bridge arm current is achieved by actively shutting down the fully controlled device. The control device 101 is connected to the active commutation current source converter 102 through a communication port, the converter bridge 1021 is connected to the equivalent commutation reactance 1022 of the converter through an AC line, the equivalent commutation reactance 1022 of the converter is also connected to the converter transformer 1023 through an AC line, and the converter transformer 1023 is also connected to the AC system 20 through an AC line. The AC system 20 includes an AC power grid 201 and an AC bus 202. The control device 101 is used to monitor the reactive power generated by the active commutation current source converter 102 and the AC system 20 in real time, or to monitor the voltage of the AC bus 202 in the AC system 20 in real time, and to adjust the reactive power in the case of reactive power imbalance, so that the active commutation current source converter 102 and the AC system 20 restore reactive power balance. The control device 101 can be, but is not limited to, a system server, various workstations, telecontrol communication equipment, an industrial control host, etc. The above-mentioned active commutation current source converter 102 may be a hybrid line commutated converter (HCC), a capacitor-loaded commutated converter (CLCC), or other types of active commutation current source converters. Figure 2 As shown, the embodiment of the present application is described by taking a twelve-pulse hybrid commutation converter as an example, and the twelve-pulse hybrid commutation converter may include multiple bridge arms. The multiple bridge arms include bridge arm Y1, bridge arm Y2, bridge arm Y3, bridge arm Y4, bridge arm Y5, bridge arm Y6 and bridge arm D1, bridge arm D2, bridge arm D3, bridge arm D4, bridge arm D5, and bridge arm D6. Each bridge arm (taking bridge arm Y1 as an example) may include a controllable commutation valve. The controllable commutation valve includes a series-connected IGCT (i.e., a fully controlled device), a drive circuit, a voltage equalizing circuit, and a lightning arrester (MOV).

[0054] Those skilled in the art will understand that Figure 1 , Figure 2The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the current source converter with active commutation and the DC transmission system to which the scheme of the present application is applied. The specific current source converter with active commutation and the DC transmission system may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0055] In one embodiment, Figure 3 As shown, a reactive power regulation method for a current source converter capable of active commutation is provided, and the method is applied to Figure 1 The control device in the example is used to illustrate, including the following steps:

[0056] S201, when it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, control the current source converter capable of active commutation to be in a target active power mode.

[0057] Among them, the bridge arm of the current source converter capable of active commutation includes a fully controlled device, and active commutation of the bridge arm current is achieved by actively shutting down the fully controlled device, and the topological structure of the current source converter capable of active commutation includes a converter transformer. The preset judgment conditions include one or more of the reactive power exchanged between the current source converter capable of active commutation in the DC transmission system and the AC system reaching a preset power threshold and the AC bus voltage in the AC system reaching a preset voltage threshold. The target active power mode is a constant power mode. The target active power corresponding to the target active power mode is within the power range of normal operation of the current source converter capable of active commutation.

[0058] In the embodiment of the present application, the control device can set the preset power threshold of reactive power and the preset voltage threshold of AC bus voltage as preset judgment conditions in advance according to the transmission demand and operation of the DC transmission system and the AC system. Then, during the transmission of power by the DC transmission system, the control device can monitor the operating status of the DC transmission system and the AC system connected to the DC transmission system in real time through a signal acquisition device such as a sensor, and specifically monitor the reactive power generated by the exchange between the current source type converter that can actively commutate in the DC transmission system and the AC system connected thereto, and / or monitor the AC bus voltage in the AC system in real time through a signal acquisition device to reach a preset voltage threshold. Specifically, the control device can directly monitor the reactive power through the reactive power monitor, and can obtain the AC bus voltage through the monitoring module in the DC transmission system. Optionally, the control device can also first monitor the voltage and current generated between the current source type converter that can actively commutate and the AC system, and then calculate the reactive power. Optionally, the control device can actively obtain the reactive power between the current source type converter that can actively commutate and the AC system. Optionally, the active commutation current source converter and the AC system can send their own electrical quantity information to the control device, and the control device determines the reactive power according to the electrical quantity information. Optionally, the control device can also control the active commutation current source converter to be in the target active power mode when receiving a start instruction sent by the tower device or a start instruction triggered by the user.

[0059] After monitoring the operating status of the DC transmission system and the AC system, the control device can further determine whether the operating status of the DC transmission system and the AC system meets the preset judgment conditions, and when it is determined that the operating status of the DC transmission system and the AC system meets the preset judgment conditions, the current source converter with active commutation can be controlled to be in the target active power mode. Specifically, the current source converter with active commutation can be controlled to keep the current active power unchanged, or the current source converter with active commutation can be controlled to keep the pre-set active power unchanged.

[0060] S202, determining the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in active power mode, and obtaining a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power.

[0061] Among them, the preset mapping relationship represents the corresponding relationship between the tap position of the converter transformer and the reactive power under different active powers, including the adjustable reactive power corresponding to different tap positions of the converter transformer under different active powers, for example, under active power 1, gear 1-adjustable reactive power 1, gear 2-adjustable reactive power 2, gear 3-adjustable reactive power 3...; under active power 2, gear 1-adjustable reactive power 1, gear 2-adjustable reactive power 2, gear 3-adjustable reactive power 3...; under active power 3, gear 1-adjustable reactive power 1, gear 2-adjustable reactive power 2, gear 3-adjustable reactive power 3... The target mapping relationship represents the corresponding relationship between the converter transformer tap position and the target reactive power under the target active power mode, and may specifically include that under the target active power, position 1-adjustable reactive power 1, position 2-adjustable reactive power 2, position 3-adjustable reactive power 3...

[0062] In the embodiment of the present application, the operation requirements of the AC system can be determined in advance based on manual experience or a professional instruction manual. Specifically, the operation requirements of the AC system can include one or more of the following: the AC bus voltage is within a preset voltage range, and the reactive power exchanged between the active commutation current source converter and the AC system is set to a preset value (for example, the preset value can be 0, that is, the AC / DC system does not generate reactive power exchange). After the control device controls the active commutation current source converter to be in the active power mode based on the above steps, the target reactive power that needs to be adjusted in the active power mode can be determined based on the operation requirements of the AC system and the active power corresponding to the active power mode.

[0063] Based on the electrical parameters of the DC transmission system, the adjustable reactive power corresponding to each converter transformer tap position under different active powers can be determined in advance, and then a preset mapping relationship is constructed based on each converter transformer tap position and the adjustable reactive power, and the preset mapping relationship is stored in a preset storage path in the form of a table, for example, it can be stored in a database or cache. After the control device controls the current source converter capable of active commutation to be in the target active power mode, the preset mapping relationship can be called from the preset storage path, and then the preset mapping relationship corresponding to the active power that is the same or close to the target active power value can be selected from the preset mapping relationship as the target mapping relationship.

[0064] S203, adjusting the tap position of the converter transformer according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0065] In an embodiment of the present application, the control device obtains the target reactive power that needs to be adjusted when the current source type converter with active commutation is in the active power mode based on the above steps, and after obtaining the target mapping relationship corresponding to the target active power mode, it can determine the converter transformer tap position that needs to be adjusted according to the target reactive power and the target mapping relationship, and then adjust the converter transformer tap position to the converter transformer tap position that needs to be adjusted, so that the reactive power corresponding to the converter transformer tap position can be released or absorbed, so as to achieve the effect that the reactive power exchanged between the current source type converter with active commutation and the AC system reaches the target reactive power.

[0066] The reactive power regulation method of the current source type converter capable of active commutation provided in the embodiment of the present application, when it is monitored that the operating status of the DC transmission system and the AC system connected to the DC transmission system meets the preset judgment conditions, firstly controls the current source type converter capable of active commutation to be in the target active power mode, then determines the target reactive power that needs to be adjusted when the current source type converter capable of active commutation is in the active power mode, and obtains the target mapping relationship corresponding to the target active power mode, and finally adjusts the converter transformer tap position according to the target reactive power and the target mapping relationship, so that the reactive power exchanged between the current source type converter capable of active commutation and the AC system connected to the current source type converter capable of active commutation reaches the target reactive power. Among them, the target mapping relationship represents the corresponding relationship between the converter transformer tap position and the target reactive power. In the above method, by controlling the active commutation current source converter to be in the target active power mode, the system active transmission can be kept unchanged, and then the reactive power can be adjusted by adjusting the converter transformer tap position, which can avoid the problem of active power change caused by directly adjusting the trigger angle or cut-off angle of the active commutation current source converter. The above method can ensure that the active power is not changed when adjusting the reactive power, and realize the active-reactive decoupling control of the converter. In addition, since HCC has the characteristics of a wide range of cut-off angle operation, the reactive power adjustment range of the above method is larger than that of QPC, which can absorb the surplus reactive power of the AC system and provide reactive support for the AC system. And the reactive power adjustment range of the above method can be changed by changing the rated cut-off angle of the converter: the larger the rated cut-off angle of the converter, the more reactive power support the above method can provide to the AC system; the smaller the rated cut-off angle of the converter, the more surplus reactive power the above method can absorb from the AC system. It helps to reduce the configuration capacity of AC filters / capacitor banks / reactive compensation devices in converter stations and improve the construction economy and operational flexibility of high-voltage DC transmission systems.

[0067] In one embodiment, a specific implementation method for adjusting the tap position of a converter transformer is also provided. Figure 4As shown, the above-mentioned "adjusting the converter transformer tap position according to the target reactive power and the target mapping relationship" in S203 includes:

[0068] S301, determining a target gear position of a converter transformer tap corresponding to a target reactive power according to a target mapping relationship.

[0069] In an embodiment of the present application, after obtaining the target mapping relationship, the control device can filter out a converter transformer tap position that is the same or similar to the target reactive power value from the target mapping relationship, and then determine the converter transformer tap position as the target position of the converter transformer tap corresponding to the target reactive power.

[0070] S302, adjusting the tap position of the converter transformer to a target position.

[0071] In an embodiment of the present application, after the control device obtains the target gear position of the converter transformer tap corresponding to the target reactive power based on the above steps, the converter transformer tap gear position can be adjusted to the target gear position so that the reactive power exchanged between the actively commutating current source type converter and the AC system connected to the actively commutating current source type converter reaches the target reactive power.

[0072] In one embodiment, Figure 5 As shown, the reactive power regulation method of the current source converter capable of active commutation also includes:

[0073] S401, construct an AC / DC system analytical model of the DC transmission system.

[0074] Among them, the AC / DC system analytical model is used to represent the power transmission between AC / DC systems.

[0075] In the embodiment of the present application, the control device can construct an AC / DC system analytical model, and then traverse the converter transformer tap positions one by one based on the AC / DC system analytical model to construct a preset mapping relationship.

[0076] Specifically, Figure 6 As shown, the “constructing an AC / DC system analytical model of a DC power transmission system” in S401 includes:

[0077] S4011, obtaining system related parameters of the DC transmission system.

[0078] Among them, the system related parameters include the parameters of the current source converter capable of active commutation, the parameters of the converter transformer and the AC side system parameters.

[0079] The parameters of the active commutation current source converter include the ideal no-load DC voltage U of the active commutation current source converter di0, rated turn-off angle γ of the current source converter with active commutation, inherent voltage drop U of the current source converter with active commutation T Rated reactive power consumption Q of active commutation current source converter N One or more of .

[0080] Converter transformer parameters include converter transformer ratio K, converter transformer rated ratio K N , commutation transformer adjustment amount per gear △K pu and gear adjustment quantity T k At least one of .

[0081] The AC side system parameters include the inverter DC side voltage U d , inverter DC side current I d , Inverter DC side active power P d , the equivalent commutation reactance X of the inverter T , reactive exchange capacity of AC and DC systems △Q, short-circuit capacity of AC systems S ac 、Rated capacity of the mth reactive group Q cm , AC bus rated voltage U acN And the AC bus voltage change △U ac One or more of .

[0082] Among them, the cut-off angle operating range of the active commutation current source converter is generally 7°-25°, and the rated cut-off angle range is recommended to be 7°-17°. The smaller the rated cut-off angle (the closer to 7°), the smaller the surplus reactive power that the active commutation current source converter can generate, and the larger the surplus reactive power that can be absorbed; the larger the rated cut-off angle (the closer to 17°), the larger the surplus reactive power that the active commutation current source converter can generate, and the smaller the surplus reactive power that can be absorbed; the rated cut-off angle can be determined according to the reactive power regulation capability requirements of the AC system (the amount of surplus reactive power that the active commutation current source converter needs to absorb or generate).

[0083] In the embodiment of the present application, the control device may obtain system-related parameters of the DC power transmission system based on a device manual of the DC power transmission system or manual input.

[0084] S4012, construct an AC / DC system analytical model based on system related parameters.

[0085] In the embodiment of the present application, after the control device obtains the system-related parameters of the DC power transmission system based on the above steps, it can construct an AC / DC system analytical model according to the system-related parameters of the DC power transmission system. The specific AC / DC system analytical model can be expressed by the following relationship:

[0086]

[0087] Among them, U di0 is the ideal no-load DC voltage of the current source converter with active commutation, γ is the rated turn-off angle of the current source converter with active commutation, U T is the inherent voltage drop of the current source converter with active commutation, Q N is the rated reactive power consumption of the current source converter with active commutation, K is the ratio of the converter transformer, K N is the rated transformation ratio of the converter transformer, △K pu T is the adjustment amount of each gear of the commutation transformer, k is the number of gear adjustments, K is the commutation ratio, △Q is the reactive power exchange of the AC / DC system, S ac is the short-circuit capacity of the AC system, Q cm is the rated capacity of the mth reactive power group, and the total number of reactive power groups is M. acN is the rated voltage of the AC bus, △U ac is the AC bus voltage change, U d is the DC side voltage of the inverter, I d is the inverter DC side current, P d is the active power on the DC side of the inverter, X T is the equivalent commutation reactance of the inverter. Among them, given the system rated parameter U d , U acN , system intrinsic parameter K N , T k , U T , X T , Q c And the AC system condition S ac .

[0088] S402, simulate the gear adjustment according to different gears of the converter transformer tap through the AC / DC system analytical model to obtain the reactive power consumed by the current source converter capable of active commutation corresponding to each gear.

[0089] In an embodiment of the present application, after the control device constructs the AC / DC system analytical model based on the above steps, it can simulate the gear adjustment according to the different gears of the converter transformer tap to obtain the reactive power consumed by the current source converter that can actively switch phases corresponding to each gear, that is, the different gears under different active powers of the converter transformer tap are input into the AC / DC system analytical model, and the AC / DC system analytical model is solved by Newton's method to obtain the reactive power consumed by the current source converter that can actively switch phases corresponding to each gear.

[0090] Specifically, Figure 7 As shown, "using the AC / DC system analytical model to simulate the gear adjustment according to different gears of the converter transformer tap to obtain the reactive power consumed by the current source converter capable of active commutation corresponding to each gear" in S402 includes:

[0091] S4021, determining different gears of the converter transformer tap under different active powers.

[0092] In an embodiment of the present application, different active powers can be determined according to the power range of normal operation of the converter transformer, and then for each active power, different gears of the converter transformer tap under the active power are further determined until different gears of the converter transformer tap under all active powers are obtained.

[0093] S4022, simulate the gear adjustment according to different gears of the converter transformer tap under each active power through the AC / DC system analytical model, and obtain the reactive power corresponding to each gear under different active power.

[0094] In the embodiment of the present application, after the control device obtains different gears of the converter transformer tap under different active powers based on the above steps, for an active power, the active power P of the inverter DC side is d The active power is kept constant, and then the gear adjustment is simulated according to the different gears of the converter transformer tap to obtain the reactive power corresponding to each gear under the active power, and the above steps are repeated until the reactive power corresponding to each gear under different active powers is obtained.

[0095] S403, determining a preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0096] In an embodiment of the present application, after the control device obtains the correspondence between different gears and different reactive powers, it can determine a preset mapping relationship based on the correspondence between different gears and different reactive powers, and store the preset mapping relationship in the form of a table under a preset storage path, for example, it can be stored in a database or cache.

[0097] Based on all the above embodiments, a reactive power regulation method of a current source converter capable of active commutation is also provided, the method comprising:

[0098] S501, obtaining system-related parameters of a direct current transmission system, wherein the system-related parameters include at least one of parameters of a current source converter capable of active commutation, parameters of a converter transformer, and system parameters on the AC side.

[0099] S502: construct an AC / DC system analytical model according to system related parameters.

[0100] S503, determining different gears of the converter transformer tap under different active powers.

[0101] S504, simulate the gear adjustment according to different gears of the converter transformer tap through the AC / DC system analytical model to obtain the reactive power consumed by the current source converter capable of active commutation corresponding to each gear.

[0102] S505: Determine a preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0103] S506, when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet preset judgment conditions, control the current source converter capable of active commutation to be in a target active power mode.

[0104] S507, determining the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in active power mode, and obtaining a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power.

[0105] S508: Determine a target gear position of the converter transformer tap corresponding to the target reactive power according to the target mapping relationship.

[0106] S509, adjusting the tap position of the converter transformer to a target position so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches a target reactive power.

[0107] Compared with the QPC function in the traditional LCC reactive power control system that only uses the trigger angle / turn-off angle as the control variable, the method described in the embodiment of the present application can control the reactive power of the HCC without changing the system's active power transmission, realize the HCC active-reactive decoupling control, and improve the operational flexibility of the high-voltage direct current transmission system. Moreover, since the HCC has a wide range of operating characteristics of the turn-off angle, the reactive power adjustment range of the above method is larger than that of the QPC, which can absorb reactive power and provide surplus reactive power for the AC system. And the larger the rated turn-off angle, the more surplus reactive power the control strategy can provide. It can give full play to the wide range of operating characteristics of the HCC turn-off angle, realize flexible reactive support for the AC system, help reduce the configuration capacity of the AC filter / capacitor bank / reactive compensation device of the converter station, and improve the construction economy and operational flexibility of the high-voltage direct current transmission system.

[0108] The methods described in the above steps are all described in the above embodiments. Please refer to the above description for details and will not be repeated here.

[0109] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0110] In one embodiment, an industrial automation control system (such as a programmable logic controller (PLC) or a distributed control system, etc.) is also provided. The industrial automation control system includes a control device, and the control device is used to execute the reactive power regulation method of the current source converter with active commutation described in any of the above embodiments.

[0111] Based on the same inventive concept, the embodiment of the present application also provides a reactive power regulating device for a current source type converter capable of active commutation for implementing the reactive power regulating method for a current source type converter capable of active commutation. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the reactive power regulating device for one or more current source type converters capable of active commutation provided below can be referred to the limitations of the reactive power regulating method for a current source type converter capable of active commutation above, and will not be repeated here.

[0112] In one embodiment, Figure 8 As shown, a reactive power regulating device of a current source type converter capable of active commutation is provided, comprising:

[0113] The monitoring module 11 is used to control the current source converter capable of active commutation to be in a target active power mode when it is monitored that the operating status of the DC power transmission system and the AC system connected to the DC power transmission system meets a preset judgment condition.

[0114] The acquisition module 12 is used to determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in the active power mode, and to obtain the target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the tap position of the converter transformer and the target reactive power.

[0115] The adjustment module 13 is used to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship so that the reactive power exchanged between the actively commutating current source converter and the AC system connected to the actively commutating current source converter reaches the target reactive power.

[0116] In one embodiment, the adjustment module includes:

[0117] The determination unit is used to determine the target gear position of the converter transformer tap corresponding to the target reactive power according to the target mapping relationship.

[0118] The regulating unit is used to adjust the tap position of the converter transformer to a target position.

[0119] In one embodiment, the reactive power regulating device of the current source converter capable of active commutation further comprises:

[0120] Building module for constructing analytical AC and DC system models of DC transmission systems.

[0121] The first determination module is used to simulate gear adjustment according to different gears of the converter transformer tap through the AC / DC system analytical model to obtain the reactive power consumed by the current source converter capable of active commutation corresponding to each gear.

[0122] The second determination module is used to determine a preset mapping relationship according to the corresponding relationship between different gears and different reactive powers.

[0123] In one embodiment, the above-mentioned building blocks include:

[0124] The acquisition unit is used to acquire system-related parameters of the DC power transmission system, wherein the system-related parameters include at least one of the parameters of the current source converter capable of active commutation, the parameters of the converter transformer and the AC side system parameters.

[0125] The construction unit is used to construct an AC / DC system analytical model according to system related parameters.

[0126] In one embodiment, the first determining module includes:

[0127] The first determination subunit is used to determine different gears of the converter transformer tap under different active powers.

[0128] The second determination subunit is used to simulate the gear adjustment according to the different gears of the converter transformer tap under each active power through the AC / DC system analytical model, and obtain the reactive power consumed by the current source converter with active commutation corresponding to each gear under different active powers.

[0129] Each module in the reactive power regulation device of the current source converter capable of active commutation can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a control device in the form of hardware, or can be stored in a memory in the control device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0130] In one embodiment, a control device is provided. The control device may be a terminal, a server, or a workstation. The internal structure diagram thereof may be as follows: Fig. 9 As shown, the control device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the control device is used to provide computing and control capabilities. The memory of the control device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a control program. The internal memory provides an environment for the operation of the operating system and the control program in the non-volatile storage medium. The input / output interface of the control device is used to exchange information between the processor and the external device. The communication interface of the control device is used to communicate with an external terminal or a distributed I / O measurement and control unit in a wired or wireless manner. The wired manner can be realized through a CAN bus, a TDM bus, optical fiber transmission, a LAN network or other technologies, and the wireless manner can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the control program is executed by the processor, a reactive power regulation method of a current source converter with active commutation is realized. The display unit of the control device is used to form a visually visible picture, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the control device can be a touch layer covered on the display screen, or a key, trackball, or touchpad provided on the housing of the control device, or an external keyboard, touchpad, or mouse, etc.

[0131] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the control device to which the scheme of the present application is applied. The specific control device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0132] In one embodiment, a control device is provided, including a memory and a processor, wherein a control program is stored in the memory, and when the processor executes the control program, the following steps are implemented:

[0133] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0134] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0135] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0136] In one embodiment, the processor further implements the following steps when executing the control program:

[0137] According to the target mapping relationship, determining the target gear position of the converter transformer tap corresponding to the target reactive power;

[0138] Adjust the converter transformer tap position to the target position.

[0139] In one embodiment, the processor further implements the following steps when executing the control program:

[0140] Construct an analytical model of the AC and DC systems of the DC transmission system;

[0141] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained;

[0142] According to the corresponding relationship between different gears and different reactive powers, a preset mapping relationship is determined.

[0143] In one embodiment, the processor further implements the following steps when executing the control program:

[0144] Obtain system-related parameters of the direct current transmission system; the system-related parameters include at least one of parameters of a current source converter capable of active commutation, parameters of a converter transformer, and system parameters on the alternating current side.

[0145] Construct an analytical model of the AC / DC system based on system-related parameters.

[0146] In one embodiment, the processor further implements the following steps when executing the control program:

[0147] Determine different gears of converter transformer taps under different active powers;

[0148] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained.

[0149] The above embodiment provides a control device, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0150] In one embodiment, a readable storage medium is provided, on which a control program is stored, and when the control program is executed by a processor, the following steps are implemented:

[0151] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0152] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0153] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0154] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0155] According to the target mapping relationship, determining the target gear position of the converter transformer tap corresponding to the target reactive power;

[0156] Adjust the converter transformer tap position to the target position.

[0157] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0158] Construct an analytical model of the AC and DC systems of the DC transmission system;

[0159] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained;

[0160] According to the corresponding relationship between different gears and different reactive powers, a preset mapping relationship is determined.

[0161] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0162] Obtain system-related parameters of the direct current transmission system; the system-related parameters include at least one of parameters of a current source converter capable of active commutation, parameters of a converter transformer, and system parameters on the alternating current side.

[0163] Construct an analytical model of the AC / DC system based on system-related parameters.

[0164] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0165] Determine different gears of converter transformer taps under different active powers;

[0166] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained.

[0167] The above embodiment provides a readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0168] In one embodiment, a control program product is provided, including a control program, which, when executed by a processor, implements the following steps:

[0169] When it is monitored that the operating states of the DC transmission system and the AC system connected to the DC transmission system meet preset judgment conditions, the current source converter capable of active commutation is controlled to be in a target active power mode;

[0170] Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in an active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power;

[0171] According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the active commutation current source converter and the AC system connected to the active commutation current source converter reaches the target reactive power.

[0172] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0173] According to the target mapping relationship, determining the target gear position of the converter transformer tap corresponding to the target reactive power;

[0174] Adjust the converter transformer tap position to the target position.

[0175] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0176] Construct an analytical model of the AC and DC systems of the DC transmission system;

[0177] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained;

[0178] According to the corresponding relationship between different gears and different reactive powers, a preset mapping relationship is determined.

[0179] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0180] Obtain system-related parameters of the direct current transmission system; the system-related parameters include at least one of parameters of a current source converter capable of active commutation, parameters of a converter transformer, and system parameters on the alternating current side.

[0181] Construct an analytical model of the AC / DC system based on system-related parameters.

[0182] In one embodiment, when the control program is executed by the processor, the following steps are also implemented:

[0183] Determine different gears of converter transformer taps under different active powers;

[0184] Through the AC / DC system analytical model, the gear adjustment is simulated according to the different gears of the converter transformer tap, and the reactive power consumed by the current source converter with active commutation corresponding to each gear is obtained.

[0185] The above embodiment provides a control program product, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0186] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a control program, and the control program can be stored in a non-volatile readable storage medium. When the control program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0187] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0188] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A reactive power regulation method for a current source converter capable of active commutation, characterized in that: A control device applied to a direct current transmission system, the method comprising: When it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition, controlling the current source converter capable of active commutation to be in a target active power mode; Determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in the active power mode, and obtain a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power; According to the target reactive power and the target mapping relationship, the tap position of the converter transformer is adjusted so that the reactive power exchanged between the actively commutating current source converter and the AC system connected to the actively commutating current source converter reaches the target reactive power.

2. The method according to claim 1, characterized in that The step of adjusting the converter transformer tap position according to the target reactive power and the target mapping relationship comprises: Determining a target gear position of a converter transformer tap corresponding to the target reactive power according to the target mapping relationship; The converter transformer tap position is adjusted to the target position.

3. The method according to claim 1, characterized in that The method further comprises: Constructing an AC / DC system analytical model of the DC power transmission system; By using the AC / DC system analytical model, simulated gear adjustment is performed according to different gears of the converter transformer tap, so as to obtain reactive power consumed by the current source converter capable of active commutation corresponding to each gear; According to the corresponding relationship between different gears and different reactive powers, a preset mapping relationship is determined.

4. The method according to claim 3, characterized in that The constructing of the AC / DC system analytical model of the DC power transmission system comprises: Acquiring system-related parameters of the direct current transmission system; An AC / DC system analytical model is constructed according to the system related parameters.

5. The method according to claim 4, characterized in that The system-related parameters include at least one of the parameters of a current source converter capable of active commutation, parameters of a converter transformer and parameters of an AC side system.

6. The method according to claim 3, characterized in that The step of simulating the gear adjustment according to different gears of the converter transformer tap by using the AC / DC system analytical model to obtain the reactive power corresponding to each gear, comprises: Determine different gears of converter transformer taps under different active powers; The AC / DC system analytical model is used to simulate gear adjustment according to different gears of the converter transformer tap under each active power, so as to obtain the reactive power corresponding to each gear under different active power.

7. A reactive power regulating device for a current source type converter capable of active commutation, characterized in that: The device comprises: A monitoring module, configured to control the current source converter capable of active commutation to be in a target active power mode when it is monitored that the operating states of the DC power transmission system and the AC system connected to the DC power transmission system meet a preset judgment condition; An acquisition module is used to determine the target reactive power that needs to be adjusted when the current source converter capable of active commutation is in the active power mode, and to acquire a target mapping relationship corresponding to the target active power mode; the target mapping relationship represents the correspondence between the converter transformer tap position and the target reactive power; The regulating module is used to adjust the tap position of the converter transformer according to the target reactive power and the target mapping relationship so that the reactive power exchanged between the actively commutating current source converter and the AC system connected to the actively commutating current source converter reaches the target reactive power.

8. A control device, comprising a memory and a processor, wherein the memory stores a control program, characterized in that: When the processor executes the control program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A readable storage medium having a control program stored thereon, characterized in that: When the control program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A control program product, comprising a control program, characterized in that: When the control program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images