A control method and device of a slave terminal tap changer of an SLCC commutation technology and a medium

Abstract

The application relates to a control method of a receiving-end tapping switch of an SLCC commutation technology, which comprises the following steps: establishing an equivalent model corresponding to the action of a receiving-end tapping switch according to the topological structure of the SLCC; and calculating the action times of the receiving-end tapping switch according to a set receiving-end tapping switch control strategy. The equivalent model comprises a converter transformer branch and an SVG branch connected with a high-voltage direct-current transmission end; the converter transformer branch and the SVG branch are connected at a grid-connected point; the converter transformer branch comprises an AC power supply Us and an impedance connected with each other; the system reactive power exchange in the converter transformer branch is Qs, the converter transformer reactive power consumption is Qtr, the converter transformer valve side voltage is Uv, and the converter transformer valve side current is Is; the equivalent model further comprises a passive filter branch, the passive filter branch is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf; the capacity of the SVG branch is Qsvg, and the branch current is Isvg. The scheme can achieve the target of reducing the action times of the receiving-end tapping switch.

Description

Technical Field

[0001] This invention relates to the field of DC power transmission technology, and in particular to a receiving-end tap changer control method, apparatus, and computer-readable storage medium for SLCC (Statcom and line commutation converter) commutation technology. Background Technology

[0002] Direct current (DC) transmission is a backbone energy transportation channel, playing an irreplaceable role in energy delivery. Addressing issues such as large-scale clean energy grid connection, transmission, and consumption, DC transmission will be a necessary means to further improve the utilization rate of clean energy, fully meet future electricity demand, and support the construction of new power systems.

[0003] Traditional design principles suggest that as power systems develop and their strength increases, DC transmission will exhibit increasingly better performance and stability. However, with the large-scale integration of new energy sources, numerous problems have emerged. For example, voltage fluctuations caused by filter switching are rising, requiring frequent switching; overvoltages in the sending-end grid tend to increase during DC transmission system disturbances, threatening wind turbine operation; and converter stations require larger land areas as project scales increase.

[0004] To address the aforementioned problems exposed by traditional designs, corresponding technologies such as LCC, VSC, and SLCC have been proposed. Among them, SLCC converter technology is a converter technology with composite voltage and current source characteristics, realizing the performance optimization and upgrade of LCC combined with VSC. SLCC commutation technology has the following advantages: (1) It reduces the dependence of DC transmission on AC systems, improves dynamic reactive power characteristics, flexibly adapts to the feeding of new energy islands, and reduces the risk of commutation failure and equipment safety risks; (2) It realizes harmonic and reactive power self-compensation, eliminates a large number of filter configurations, greatly reduces the footprint of converter stations, and improves environmental adaptability; (3) It effectively suppresses the oscillation risk caused by the voltage source characteristics of VSC DC transmission technology; (4) It solves the problem of limited capacity of VSC DC transmission technology. This technology greatly improves the flexibility and adaptability of DC transmission technology in the scenario of new energy grid connection and DC transmission under the development of future new power systems.

[0005] However, the inventors of this application discovered in their research that, as a new technology, the topology of SLCC reduces the number of operations of the sending-end tap changer on the one hand, but increases the number of operations of the receiving-end tap changer on the other. The increase in the number of receiving-end tap changers increases the risk of converter failure and endangers the safe operation of the converter station. Summary of the Invention

[0006] To address the aforementioned problems, the purpose of this invention is to provide a receiving-end tap changer control method, device, and medium for SLCC commutation technology, which can flexibly adjust the tap changer control strategy according to operating conditions, thereby reducing the number of tap changer operations and broadening the adaptability of SLCC commutation technology.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This application provides a receiving-end tap changer control method for SLCC commutation technology, the method comprising:

[0009] Based on the topology of SLCC, an equivalent model of the corresponding receiving-end tap changer operation is established;

[0010] The number of times the receiving-end tap changer operates is calculated based on the set receiving-end tap changer control strategy.

[0011] In one implementation of this application, the equivalent model includes: a converter transformer branch and an SVG branch connected to the high-voltage direct current transmission terminal; the converter transformer branch and the SVG branch are connected at the grid connection point.

[0012] The converter transformer branch includes a connected AC power supply Us and an impedance; the reactive power exchange of the system in the converter transformer branch is Qs, the reactive power consumption of the converter transformer is Qtr, the voltage on the valve side of the converter transformer is Uv, and the current on the valve side of the converter transformer is Is.

[0013] The equivalent model also includes a passive filter branch, which is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf.

[0014] The capacity of the SVG branch is Qsvg, and the branch current is Isvg.

[0015] In one implementation of this application, the receiving-end tap changer control strategy specifically includes dynamic movement of the reactive power exchange junction zero point.

[0016] In one implementation of this application, calculating the number of operations of the receiving-end tap changer according to the set receiving-end tap changer control strategy includes:

[0017] Set the DC power operating range of the high-voltage direct current transmission terminal;

[0018] Set constraints for passive filter configuration and reactive power exchange;

[0019] Determine the zero-power operating point of the reactive power exchange junction;

[0020] The number of tap changer operations at the zero-power point of the reactive power exchange junction is calculated iteratively.

[0021] This application also provides a receiving-end tap changer control device for SLCC commutation technology, the device comprising:

[0022] The model building module is used to build an equivalent model of the corresponding receiving-end tap changer operation based on the SLCC topology.

[0023] The action calculation module is used to calculate the number of actions of the receiving-end tap changer according to the set receiving-end tap changer control strategy.

[0024] In one implementation of this application, the equivalent model includes: a converter transformer branch and an SVG branch connected to the high-voltage direct current transmission terminal; the converter transformer branch and the SVG branch are connected at the grid connection point.

[0025] The converter transformer branch includes a connected AC power supply Us and an impedance; the reactive power exchange of the system in the converter transformer branch is Qs, the reactive power consumption of the converter transformer is Qtr, the voltage on the valve side of the converter transformer is Uv, and the current on the valve side of the converter transformer is Is.

[0026] The equivalent model also includes a passive filter branch, which is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf.

[0027] The capacity of the SVG branch is Qsvg, and the branch current is Isvg.

[0028] In one implementation of this application, the receiving-end tap changer control strategy specifically includes dynamic movement of the reactive power exchange junction zero point.

[0029] In one implementation of this application, the action calculation module is used to set the DC power operating range of the high-voltage direct current transmission terminal; set the passive filter configuration and reactive power exchange constraints; determine the zero operating power point of the reactive power exchange junction; and iteratively calculate the number of tap changer operations at the zero operating power point of the reactive power exchange junction.

[0030] This application also provides a computer-readable storage medium storing a computer program, which, when executed, controls the device containing the computer-readable storage medium to perform the receiving-end tap changer control method of the SLCC commutation technology described in the foregoing implementation.

[0031] This application also provides a computer device, including a memory and a processor, wherein the processor stores a computer program, and the processor executes the computer program to implement the receiving-end tap changer control method of the SLCC commutation technology described in the foregoing implementation.

[0032] The present invention has the following advantages due to the adoption of the above technical solutions: In the solution of the present invention, an equivalent model of the corresponding receiving-end tap changer operation is established according to the topology of SLCC, and the number of operation of the receiving-end tap changer is calculated according to the set receiving-end tap changer control strategy. The control target can be flexibly adjusted according to the working conditions to achieve the goal of reducing the number of tap changer operation, thus broadening the adaptability of SLCC commutation technology. Attached Figure Description

[0033] Figure 1 This is a schematic flowchart of a receiving-end tap changer control method for SLCC commutation technology provided in an embodiment of this application;

[0034] Figure 2 This is a schematic diagram of the topology of an SLCC commutation valve provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the circuit structure of the equivalent model in the embodiments of this application. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0037] The existing SLCC commutation topology increases the number of tap changer operations at the receiving end, increasing the risk of converter failures and jeopardizing the safe operation of the converter station. This application addresses this issue by providing a receiving-end tap changer control method, apparatus, and medium for SLCC commutation technology. The method includes: establishing an equivalent model of the receiving-end tap changer operation based on the SLCC topology; and calculating the number of tap changer operations based on a set receiving-end tap changer control strategy. This technical solution allows for flexible adjustment of the tap changer control strategy according to operating conditions, reducing the number of tap changer operations and broadening the adaptability of SLCC commutation technology.

[0038] See Figure 1 In one aspect of this application, a receiving-end tap changer control method for commutation technology is provided.

[0039] The method includes:

[0040] S11. Based on the topology of SLCC, establish an equivalent model of the corresponding receiving-end tap changer operation.

[0041] S12, calculate the number of times the receiving-end tap changer operates according to the set receiving-end tap changer control strategy.

[0042] The process of the above method is described below in a more detailed embodiment of this application, taking into account the specific topology of SLCC and the specific circuit schematic of the model.

[0043] In this embodiment of the application, the receiving-end tap changer control method of the commutation technology provided includes:

[0044] S11. Based on the topology of SLCC, establish an equivalent model of the corresponding receiving-end tap changer operation.

[0045] Specifically, the topology of SLCC is as follows: Figure 2 As shown, based on the main wiring topology of SLCC, an equivalent model of the embodiment zho in this application is established.

[0046] For details regarding the equivalent model, please refer to [link / reference needed]. Figure 3 The equivalent model includes: a converter transformer branch and an SVG branch connected to the high-voltage direct current transmission terminal; the converter transformer branch and the SVG branch are connected at the grid connection point; the converter transformer branch includes a connected AC power supply Us and an impedance; the system reactive power exchange in the converter transformer branch is Qs, the reactive power consumption of the converter transformer is Qtr, the voltage on the valve side of the converter transformer is Uv, and the current on the valve side of the converter transformer is Is; the equivalent model also includes a passive filter branch, which is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf; the capacity of the SVG branch is Qsvg, and the branch current is Isvg.

[0047] Table 1 shows the DC resistance of each DC project and the number of tap changer operations under bipolar full voltage.

[0048]

[0049] Table 1

[0050] As can be seen from the above, the number of tap changer operations varies under different DC resistances and impedance matching conditions.

[0051] In the conventional LCC scheme, the parameters of the DC main circuit at the sending end are as follows:

[0052] UdR=Udi0·cosα-Id·XdR;

[0053] Where XdR is the nominal value of the equivalent impedance of the rectifier-side converter transformer;

[0054] UdI=Udi0·cosγ-Id·XdI=UdR-Id·Rd;

[0055] UdR=Udi0·cosγ-Id·(Rd-XdI);

[0056] K = Rd - XdI;

[0057] Where XdI is the nominal value of the equivalent impedance of the commutator on the inverter side, Rd is the DC resistance, and Udi0 is the ideal control DC voltage. The SLCC topology reduces the commutator impedance, and the difference between Rd and XdI will further increase. Therefore, when the DC power changes, the corresponding ideal control DC voltage Udi0 will continuously increase.

[0058] S12, calculate the number of times the receiving-end tap changer operates according to the set receiving-end tap changer control strategy.

[0059] Specifically, the SLCC scheme typically adopts a control mode where the reactive power exchange value of the AC-DC system is zeroed to reduce the impact of the DC system on the AC system. In order to reduce the number of tap changer operations and adapt to the power fluctuations of the DC system, the following can be considered: 1) dynamic reactive power adjustment method; 2) configuring appropriate reactive power compensation equipment in combination with dynamic reactive power adjustment method; 3) dynamic movement of the reactive power exchange zero point.

[0060] The following comparison of the number of trip switches is based on two calculation results: one with a reactive power exchange value of 0 and the other with dynamic changes. All examples use a single 6-pulse operation. Uv represents the converter transformer valve-side voltage, Qacex represents the reactive power exchange value of the AC / DC system, Qsvg represents the SVG output, and QLg represents the reactive power consumption of the SVG-connected reactor.

[0061] The reactive power exchange of the AC system is always kept at zero, and the tap changer operates 4 times during the process of DC power from 0.1 to 1.0 pu.

[0062] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 154.52 153.87 153.14 152.33 151.43 150.45 149.38 148.23 146.98 145.64 Qacex 0 0 0 0 0 0 0 0 0 0 Qsvg 33.04 70.73 112.79 159.01 209.17 263.11 320.67 381.70 446.08 513.69 QLg -1.89 -7.53 -16.83 -29.75 -46.19 -66.12 -89.46 -116.17 -146.18 -179.46 gear -4 -4 -4 -3 -3 -2 -2 -1 0 0

[0063] Table 2

[0064] 1) Dynamic adjustment method of reactive power

[0065] To ensure the uniformity of the positive and negative changes in reactive power exchange difference, the reactive power exchange is controlled to be zero when the DC power is 0.5 pu, while the reactive power exchange value is allowed to vary at other power points.

[0066] The tap changer operated 0 times, and the maximum reactive power exchange was 170 Mvar.

[0067] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 151.47 151.4 151.59 151.71 151.43 151.08 151.91 151.41 151.78 151.15 Qacex -100 -80 -50 -20 0 20 80 100 150 170 Qsvg 133.04 150.73 162.79 179.01 209.17 243.11 240.67 281.70 296.08 343.69 QLg -101.89 -87.53 -66.83 -49.75 -46.19 -46.12 -9.46 -16.17 3.82 -9.46 gear -3 -3 -3 -3 -3 -3 -3.0 -3 -3 -3

[0068] Table 3

[0069] 2) Configure appropriate reactive power compensation equipment in conjunction with dynamic reactive power adjustment methods.

[0070] Four sets of 300Mvar passive filters are configured and put into operation before unlocking. The system's reactive power is still at zero as the control target. The total reactive power of 1200Mvar can be calculated into a single 6-pulse, which can be considered as a single 6-pulse. The AC system can provide 150Mvar of reactive power.

[0071] The conventional control mode of SVG is constant reactive power control, which controls the reactive power exchange of the AC system to zero. In this control mode, the valve side voltage needs to change according to the changes in DC power and AC system voltage. It is not an independent free variable. Therefore, the tap changer inevitably needs to be adjusted.

[0072] To adapt to the rise and fall of DC power and reduce the number of tap changer operations, the SVG control mode was changed to constant valve-side voltage control. At this time, the valve-side voltage is fixed, while the reactive power output of the SVG needs to be adjusted according to the change of DC power. It is not an independent free variable and cannot be used in conjunction with the grid-side AC filter to cut off the reactive power of the system to zero.

[0073] like Figure 3 As shown, if the valve-side voltage Uv is fixed and the DC power is given (represented by Udi0), then the output voltage of the SVG has a unique solution and changes with the DC power. The principle is as follows: the given DC power represents a given DC current Id, therefore the converter valve network-side port current Is is a constant. The active component of the converter valve network-side port current only flows through the converter transformer, resulting in a fixed distribution between the converter transformer valve-side current Iv and the SVG output current Isvg. Therefore, the SVG output current Isvg is a constant, and the reactive power output of the SVG is also a constant, and it is a variable that follows the DC power.

[0074] If the goal is to cut off the reactive power to zero, the tap changer will operate 5 times during the process of DC power changing from 0.1 to 1.0 pu.

[0075] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 152.08 153.62 155.39 156.85 155.99 155.06 154.05 152.96 151.78 150.52 Qacex 0 0 0 0 0 0 0 0 0 0 Qacf 150 150 150 150 150 150 150 150 150 150 Qsvg -116.96 -79.27 -37.21 9.01 59.17 113.11 170.67 231.70 296.08 363.69 QLg 148.11 142.47 133.17 120.25 103.81 83.88 60.54 33.83 3.82 -29.46 gear -3 -4 -5 -5 -5 -5 -4 -4 -3 -2

[0076] Table 4

[0077] If the reactive power exchange is constantly changing dynamically, the tap changer will operate 0 times during the DC power change from 0.1 to 1.0 pu, and the maximum reactive power exchange will be 250 MVar.

[0078] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 151.47 151.4 151.59 151.71 151.43 151.08 151.91 151.41 151.78 151.15 Qacex -250 -230 -200 -170 -150 -130 -70 -50 0 20 Qacf 150 150 150 150 150 150 150 150 150 150 Qsvg 133.04 150.73 162.79 179.01 209.17 243.11 240.67 281.70 296.08 343.69 QLg -101.89 -87.53 -66.83 -49.75 -46.19 -46.12 -9.46 -16.17 3.82 -9.46 gear -3 -3 -3 -3 -3 -3 -3 -3 -3 -3

[0079] Table 5

[0080] If the reactive power exchange limit is ±150Mvar, then the tap changer will operate a total of 1 time during the DC power change from 0.1 to 1.0 pu.

[0081] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 151.47 151.4 151.59 151.71 151.43 151.08 151.91 151.41 151.78 150.52 Qacex -100 -80 -50 -20 0 20 80 100 150 150 Qsvg 133.04 150.73 162.79 179.01 209.17 243.11 240.67 281.70 296.08 364.04 QLg -101.89 -87.53 -66.83 -49.75 -46.19 -46.12 -9.46 -16.17 3.82 -29.46 gear -3 -3 -3 -3 -3 -3 -3 -3 -3 -2

[0082] Table 6

[0083] If the reactive power exchange limit is ±90Mvar, then the tap changer will operate a total of 2 times during the DC power change from 0.1 to 1.0 pu, with no tripping. At this time, the Uv voltage reference value is set to 148.23kV (0.8 pu corresponds to Udi0), and the tap changer will operate a total of 2 times.

[0084] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 151.77 151.40 150.96 150.45 149.85 149.17 148.74 148.23 148.94 148.60 Qacex -90 -80 -70 -60 -50 -40 -20 0 60 90 Qsvg 123.39 151.11 183.23 219.24 259.52 303.56 340.97 381.95 386.31 424.12 QLg -91.89 -87.53 -86.83 -89.75 -96.19 -106.12 -109.46 -116.17 -86.18 -89.46 gear -3 -3 -3 -2 -2 -2 -1 -1 -1 -1

[0085] Table 7

[0086] If the reactive power exchange limit is ±90Mvar and tap skipping is allowed, the tap changer will operate a total of 3 times during the DC power change from 0.1 to 1.0 pu, with Uv set to 153.14 kV (Udi0 for 0.3 pu) and 148.23 kV (Udi0 for 0.8 pu) respectively. Compared to the tap skipping-free scheme, the number of tap changer operations increases by 1.

[0087] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 152.69 152.95 153.14 153.25 153.29 149.17 147.76 148.23 148.94 148.60 Qacex -60 -30 0 30 60 -50 -40 0 60 90 Qsvg 93.29 101.17 113.25 129.50 149.50 303.56 371.16 381.95 386.31 424.12 QLg -61.89 -37.53 -16.83 0.25 13.81 -106.12 -139.46 -116.17 -86.18 -89.46 gear -4 -4 -4 -4 -4 -1 -1 -1 -1 -1

[0088] Table 8

[0089] If we consider the reactive power junction zero point of 0.1 pu and dynamically adjust the reactive power junction zero point by switching the filter, the number of tap changer operations is 0 throughout the entire DC power variation range.

[0090] Pd 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Uv 154.52 154.48 154.06 153.56 153.29 152.94 153.14 152.96 153.32 153.00 Qacex 0 20 30 40 60 80 120 150 200 230 Qsvg 33.46 51.17 83.16 119.37 149.50 183.60 201.01 232.02 246.44 284.16 QLg -1.89 12.47 13.17 10.25 13.81 13.88 30.54 33.83 53.82 50.54 gear -4 -4 -4 -4 -4 -4 -4 -4 -4 -4

[0091] Table 9

[0092] 3) Dynamic shift of reactive power exchange junction zero point

[0093] Dynamic shifting of the junction zero point is achieved by switching filters. By switching filters, reactive power exchange is maintained within 90 Mvar, ensuring a constant AC system voltage and preventing tap changers from operating across the entire power range. If operating for an extended period below 0.1-0.6 pu, the reactive power junction zero point is always set at 0.1 pu, with other power points compensated by reactive power compensation devices. When the operating power is consistently in the 0.1-0.7 pu range, one filter can be activated; if it is consistently in the 0.1-0.8 pu range, two filters can be activated; if it is consistently in the 0.3-0.9 pu range, three filters can be activated; and if it is consistently in the 0.5-1.0 pu range, four filters can be activated.

[0094]

[0095] Table 10

[0096] Based on the above comparison, the optimal receiving-end tap changer control strategy is specifically dynamic zero-point shifting of the reactive power exchange junction. The detailed algorithm flow for the corresponding number of tap changer actions includes:

[0097] Set the DC power operating range of the high-voltage direct current transmission terminal;

[0098] Set constraints for passive filter configuration and reactive power exchange;

[0099] Determine the zero-power operating point of the reactive power exchange junction;

[0100] The number of tap changer operations at the zero-power point of the reactive power exchange junction is calculated iteratively.

[0101] In summary, to reduce the number of tap changer operations, a dynamic moving tap changer control strategy at the zero point of the reactive power exchange junction can be adopted, which effectively suppresses the number of tap changer operations and ensures the safe and reliable operation of the converter station equipment.

[0102] In another aspect of the embodiments of this application, a receiving-end tap changer control device for SLCC commutation technology is also provided. This device can be implemented in a computer device in hardware or software.

[0103] Embodiments of this application provide a receiving-end tap changer control device for SLCC commutation technology, the device comprising:

[0104] The model building module is used to build an equivalent model of the corresponding receiving-end tap changer operation based on the SLCC topology.

[0105] The action calculation module is used to calculate the number of actions of the receiving-end tap changer according to the set receiving-end tap changer control strategy.

[0106] The device provided in the above embodiments establishes an equivalent model of the corresponding receiving-end tap changer operation based on the SLCC topology, and then calculates the number of tap changer operations based on the set receiving-end tap changer control strategy. It can flexibly adjust the control target according to the operating conditions to achieve the goal of reducing the number of tap changer operations, thus broadening the adaptability of SLCC commutation technology.

[0107] The above-mentioned device can be implemented in a computer device in hardware or software, so that the computer device can implement the receiving end tap changer control method of SLCC commutation technology in the embodiments of this application. The specific method can be referred to the description of the foregoing embodiments, and will not be repeated here.

[0108] In this application embodiment, a computer-readable storage medium is also provided, which stores a computer program. When the computer device executes the computer program, it implements the receiving-end tap changer control method of the SLCC commutation technology in this application embodiment.

[0109] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0110] In the embodiments provided by this invention, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0111] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A receiving-end tap changer control method for SLCC commutation technology, characterized in that, The method includes: Based on the topology of SLCC, an equivalent model of the corresponding receiving-end tap changer operation is established; The number of times the receiving-end tap changer operates is calculated based on the set receiving-end tap changer control strategy; The equivalent model includes: a converter transformer branch and an SVG branch connected to the high-voltage direct current transmission terminal; the converter transformer branch and the SVG branch are connected at the grid connection point. The converter transformer branch includes a connected AC power supply Us and an impedance; the reactive power exchange of the system in the converter transformer branch is Qs, the reactive power consumption of the converter transformer is Qtr, the voltage on the valve side of the converter transformer is Uv, and the current on the valve side of the converter transformer is Is. The equivalent model also includes a passive filter branch, which is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf. The capacity of the SVG branch is Qsvg, and the branch current is Isvg; The receiving-end tap changer control strategy specifically includes dynamic movement of the reactive power exchange junction zero point. The calculation of the number of operations of the receiving-end tap changer according to the set receiving-end tap changer control strategy includes: Set the DC power operating range of the high-voltage direct current transmission terminal; Set constraints for passive filter configuration and reactive power exchange; Determine the zero-power operating point of the reactive power exchange junction; The number of tap changer operations at the zero-power point of the reactive power exchange junction is calculated iteratively.

2. A receiving-end tap changer control device for SLCC commutation technology, characterized in that, The device includes: The model building module is used to build an equivalent model of the corresponding receiving-end tap changer operation based on the SLCC topology. The action calculation module is used to calculate the number of actions of the receiving end tap switch according to the set receiving end tap switch control strategy; The equivalent model includes: a converter transformer branch and an SVG branch connected to the high-voltage direct current transmission terminal; the converter transformer branch and the SVG branch are connected at the grid connection point. The converter transformer branch includes a connected AC power supply Us and an impedance; the reactive power exchange of the system in the converter transformer branch is Qs, the reactive power consumption of the converter transformer is Qtr, the voltage on the valve side of the converter transformer is Uv, and the current on the valve side of the converter transformer is Is. The equivalent model also includes a passive filter branch, which is connected in parallel with the AC power supply Us, and the capacity of the passive filter branch is Qacf. The capacity of the SVG branch is Qsvg, and the branch current is Isvg; The receiving-end tap changer control strategy specifically includes dynamic movement of the reactive power exchange junction zero point. The action calculation module is used to set the DC power operating range of the high-voltage DC transmission terminal; set the passive filter configuration and reactive power exchange constraints; determine the zero operating power point of the reactive power exchange junction; and iteratively calculate the number of tap changer actions at the zero operating power point of the reactive power exchange junction.

3. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed, controls the device containing the computer-readable storage medium to perform the receiving-end tap changer control method of the SLCC commutation technology as described in claim 1.

4. A computer device, characterized in that, It includes a memory and a processor, the processor storing a computer program, the processor executing the computer program to implement the receiving-end tap changer control method of the SLCC commutation technology as described in claim 1.

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