New energy plant station voltage regulation and control method and system based on lowest loss principle

Abstract

The invention discloses a new energy plant station voltage regulation and control method and system based on the lowest loss principle, and the method comprises the following steps: obtaining the active power value of each inverter, and calculating the loss value of the inverter based on the active power value; setting the reactive power of each inverter as rated reactive power according to the maximum value of the reactive power coefficient, selecting one inverter in sequence according to the sequence of the loss values from small to large, and calculating the sum of the reactive power which can be output by the plurality of selected inverters; and when the sum of the reactive power output by the plurality of selected inverters is greater than the total reactive power demand of the new energy plant station, regulating and controlling the voltage of the new energy plant station by adjusting the reactive power output by the plurality of selected inverters based on the principle of lowest loss. By means of refined inverter management and reactive power control, system loss minimization is achieved, the operation efficiency and economical efficiency of a new energy plant station are improved, and meanwhile the stability and the electric energy quality of a power grid are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power system control, and in particular to a voltage control method and system for a new energy plant based on the principle of minimum loss. Background Art

[0002] The output of wind turbines and photovoltaic units is greatly affected by the weather, and their power generation output has large random fluctuations, which often leads to the phenomenon of "abandoning wind" and "abandoning light" on the power generation side. Therefore, in order to avoid this phenomenon, it is necessary to study it and make it a high-quality frequency regulation resource, alleviate the frequency regulation pressure of traditional hydro-thermal power plants, and accelerate the dynamic response performance of system frequency regulation.

[0003] In fact, both new energy systems and energy storage systems have certain reactive power support capabilities. In new energy plants and stations, the reactive power of each device should be fully utilized to achieve comprehensive regulation of AC voltage. At present, the voltage support of new energy plants and stations mainly adopts SVG for voltage support, but the support capacity of SVG is limited, especially in transient processes, and can only support the voltage of the PCC point. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a voltage control method and system for a new energy plant based on the principle of minimum loss. Through refined inverter management and reactive power control, the system loss is minimized, the operating efficiency and economy of the new energy plant are improved, and the stability and power quality of the power grid are ensured.

[0005] To solve the above technical problems, a first aspect of an embodiment of the present invention provides a voltage control method for a new energy plant based on the principle of minimum loss. The new energy plant includes a plurality of inverters, each of which is connected to a node on an AC transmission line. The control method includes the following steps:

[0006] Acquiring an active power value of each of the inverters, and calculating a loss value of the inverter based on the active power value;

[0007] The reactive power of each inverter is set as the rated reactive power according to the maximum value of the reactive coefficient, the inverters are selected in order from small to large according to the loss values, and the sum of the reactive powers that can be output by the selected inverters is calculated;

[0008] When the sum of the reactive powers output by the selected inverters is greater than the total reactive power demand of the new energy plant, the voltage of the new energy plant is regulated by adjusting the reactive power values ​​output by the selected inverters based on the principle of minimum loss.

[0009] Furthermore, the calculation formula for the sum of reactive powers that can be output by the selected plurality of inverters is:

[0010]

[0011] Among them, ΔQ k is the output reactive power of the kth selected inverter, K s is the number of inverters that have been selected.

[0012] Furthermore, the K s The proposed output reactive power of the inverter has been selected The calculation formula is:

[0013]

[0014] in, For K s The proposed output reactive power of the inverter, Q r is the total reactive power demand of the new energy plant, For K s The current reactive power of the inverter.

[0015] Furthermore, the calculation formula of the loss value of the inverter is:

[0016]

[0017] Among them, R ij is the resistance value of the i-th branch of the j-th inverter, X kj is the reactance value of the kth branch of the jth inverter, P j is the active power value of the jth inverter, P total is the total output active power of the new energy plant, n is the number of branch sections connecting the jth inverter to the PCC point;

[0018] The total loss value Q of several inverters is ALL The calculation formula is:

[0019]

[0020] Wherein, m is the total number of inverters, δ j is the reactive power coefficient of the jth inverter.

[0021] Furthermore, the calculation formula of the maximum reactive power coefficient is:

[0022]

[0023] Among them, Q Nj is the rated reactive power of the jth inverter, Pj is the active power value of the jth inverter.

[0024] Furthermore, the inverter includes: a photovoltaic inverter, a wind turbine inverter, an energy storage inverter and / or a SVG inverter.

[0025] Accordingly, a second aspect of an embodiment of the present invention provides a new energy plant voltage control system based on the minimum loss principle, wherein the new energy plant includes a plurality of inverters, each of which is connected to a node on an AC transmission line, and the voltage of the new energy plant is controlled based on any of the above-mentioned new energy plant voltage control methods based on the minimum loss principle, and the control system includes:

[0026] a loss calculation module, configured to obtain an active power value of each of the inverters, and calculate a loss value of the inverter based on the active power value;

[0027] An inverter selection module, which is used to set the reactive power of each inverter as the rated reactive power according to the maximum value of the reactive coefficient, select one inverter in order from small to large loss values, and calculate the sum of reactive powers that can be output by the selected inverters;

[0028] A voltage control module is used to control the voltage of the new energy plant by adjusting the reactive power values ​​output by the selected several inverters based on the principle of minimum loss when the sum of the reactive power that can be output by the selected several inverters is greater than the total reactive power demand of the new energy plant.

[0029] Furthermore, the calculation formula for the sum of reactive powers that can be output by the selected plurality of inverters is:

[0030]

[0031] Among them, ΔQ k is the output reactive power of the kth selected inverter, K s is the number of inverters selected;

[0032] No. K s The proposed output reactive power of the inverter has been selected The calculation formula is:

[0033]

[0034] in, For K s The proposed output reactive power of the inverter, Q r is the total reactive power demand of the new energy plant, For K sThe current reactive power of the inverter.

[0035] Correspondingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes any of the above-mentioned new energy plant voltage control methods based on the principle of minimum loss.

[0036] Correspondingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement any of the above-mentioned new energy plant voltage control methods based on the principle of minimum loss.

[0037] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0038] 1. By calculating the loss value of each inverter and selecting the inverter with the lowest loss value to participate in voltage regulation first, the energy efficiency of the inverter is optimized during operation, the heat loss of the inverter and the energy loss during the power conversion process are reduced, thereby improving the energy utilization efficiency of the entire new energy plant;

[0039] 2. By setting the reactive power of the inverter to its rated value and sorting and selecting according to the loss value of the inverter, the accurate output and regulation of reactive power is ensured. When the selected inverter combination can meet the total reactive power demand of the plant, the system can make timely adjustments to avoid excess or insufficient reactive power, thereby ensuring the voltage stability and power quality of the power grid;

[0040] 3. The control strategy based on the principle of minimum loss not only focuses on the operating efficiency of a single inverter, but also takes into account the loss of the entire system. By optimizing the selection of inverters and reactive power output, it reduces the overall loss of the system, reduces operating costs, and improves the economy and market competitiveness of new energy plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of a voltage control method for a new energy plant based on the principle of minimum loss provided by an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the connection between a new energy plant and a new energy station provided by an embodiment of the present invention;

[0043] Figure 3 It is a block diagram of a module of a new energy plant voltage control system based on the principle of minimum loss provided by an embodiment of the present invention.

[0044] Reference numerals:

[0045] 1. Loss calculation module, 2. Inverter selection module, 3. Voltage control module. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0047] Please refer to Figure 1 and Figure 2 A first aspect of an embodiment of the present invention provides a voltage control method for a new energy plant based on the principle of minimum loss. The new energy plant includes a plurality of inverters, each inverter is connected to a node on an AC transmission line, and the control method includes the following steps:

[0048] Step S100, obtaining the active power value of each inverter, and calculating the loss value of the inverter based on the active power value.

[0049] Step S200, setting the reactive power of each inverter to the rated reactive power according to the maximum reactive coefficient value, selecting an inverter in order of loss value from small to large, and calculating the sum of reactive powers that can be output by the selected inverters.

[0050] Step S300, when the sum of reactive powers output by the selected inverters is greater than the total reactive power demand of the new energy plant, the voltage of the new energy plant is regulated by adjusting the reactive power values ​​output by the selected inverters based on the principle of minimum loss.

[0051] The above-mentioned new energy plant voltage control method accurately obtains the active power value of each inverter and calculates the corresponding loss, and then optimizes the reactive power output of the inverter according to the reactive coefficient and the loss value, so as to minimize the system loss while meeting the reactive power demand of the plant; by intelligently selecting the inverter and regulating its reactive output, it not only improves the efficiency and accuracy of voltage control, but also reduces energy loss and optimizes the power quality of the new energy plant, thereby improving the economy and reliability of the entire system.

[0052] Specifically, the calculation formula for the sum of reactive powers that can be output by the selected inverters is:

[0053]

[0054] Among them, ΔQ k is the output reactive power of the kth selected inverter, K sis the number of inverters selected.

[0055] By calculating the sum of the reactive power output of the selected inverters and comparing this reactive power sum with the total reactive power demand of the new energy plant, the inverter output can be precisely controlled; the voltage regulation process can be ensured to be efficient and economical, and by optimizing the reactive power output of the inverter, energy loss is reduced, voltage stability is improved, and the power quality and overall operating efficiency of the new energy plant are enhanced. In addition, this method helps to extend the service life of the inverter by avoiding unnecessary high-load operation of the inverter.

[0056] Furthermore, the K s The proposed output reactive power of the selected inverter The calculation formula is:

[0057]

[0058] in, For K s The proposed output reactive power of each inverter, Q r is the total reactive power demand of the new energy plant, For K s The current reactive power of each inverter.

[0059] By accurately calculating the reactive power to be output by each selected inverter, it ensures that the new energy plant can optimize the distribution and output of reactive power according to actual demand and the current state of the inverter; it can dynamically adjust the reactive power output of the inverter to meet the total reactive power demand of the plant, while taking into account the actual capacity and limitations of the inverter, thereby improving the accuracy and response speed of voltage regulation. This method can effectively reduce energy loss, improve power quality, enhance the stability and reliability of the power grid, and also provide a more flexible and efficient operating environment for the inverter.

[0060] Furthermore, the calculation formula of the inverter loss value is:

[0061]

[0062] Among them, R ij is the resistance value of the i-th branch of the j-th inverter, X kj is the reactance value of the kth branch of the jth inverter, P j is the active power value of the jth inverter, P total is the total output active power of the new energy plant, and n is the number of branch sections connecting the jth inverter to the PCC point.

[0063] By calculating the loss value of the inverter, the resistance and reactance of the inverter's internal branches and the influence of active power are taken into account, so that the loss of each inverter in different branch sections can be accurately evaluated; and a refined loss management method is provided, so that the new energy plant can optimize the distribution of reactive power according to the actual loss of the inverter, achieve more effective voltage support and improve grid stability. In addition, it can also reduce the heat loss of the inverter and improve its operating efficiency, while also helping to reduce the overall energy consumption of the plant and improve the quality of power.

[0064] The total loss value of several inverters is Q ALL The calculation formula is:

[0065]

[0066] Where m is the total number of inverters, δ j is the reactive power coefficient of the jth inverter.

[0067] By calculating the total loss value of several inverters and taking the reactive power coefficient of the inverter into consideration, the loss of the entire system can be comprehensively evaluated; and the new energy plant station is allowed to optimize the voltage control strategy according to the reactive power output capacity of the inverter to reduce the loss of the entire system; the efficiency of voltage regulation is improved, the stability of the power grid and the quality of power are ensured, while energy waste is reduced, and the overall performance and economic benefits of the new energy plant station are improved.

[0068] Furthermore, the calculation formula for the maximum reactive power coefficient is:

[0069]

[0070] Among them, Q Nj is the rated reactive power of the jth inverter, P j is the active power value of the jth inverter.

[0071] The rated reactive power of each inverter is determined by calculating the maximum value of the reactive coefficient, taking into account the active power value of the inverter to ensure that the distribution of reactive power matches the actual operating capacity of the inverter; it can accurately control the reactive output of the inverter, optimize voltage support, and improve the stability and power quality of the power grid.

[0072] In the embodiment of the present invention, the inverter includes: a photovoltaic inverter, a wind turbine inverter, an energy storage inverter and / or a SVG inverter.

[0073] During voltage regulation, photovoltaic inverters can support the voltage stability of the power grid by adjusting their output reactive power, especially when the photovoltaic output fluctuates due to changes in sunshine, and the grid voltage can be maintained stable through dynamic reactive power control. Wind turbine inverters are usually located in wind farms. They are not only responsible for power conversion, but also participate in the voltage support of the power grid by adjusting reactive power output. Especially when wind speed changes cause wind power output fluctuations, wind turbine inverters can quickly respond to grid demand and provide necessary reactive power. In voltage regulation, energy storage inverters can quickly adjust their charging and discharging states according to the grid conditions and provide necessary reactive power support, thereby helping to smooth grid load fluctuations and maintain voltage stability. SVG inverters (reactive power compensators) can accurately control the reactive power injected into the grid by quickly adjusting the phase and amplitude of their output voltage, thereby providing instant reactive power compensation when the voltage fluctuates and enhancing the stability of the grid.

[0074] The above technical solution is fully described below with a specific embodiment:

[0075] Please refer to Figure 2 , the active power generated by a single inverter is P, and the reactive power required is Q. The inverter power needs to pass through n branches to be transmitted to the PCC point. Assume that the total capacity of the i-th branch is S i , the corresponding impedance is R i +jX i ; The loss caused by the inverter is:

[0076]

[0077] in, is the voltage value of the i-th branch.

[0078] The above formula can be simplified to:

[0079]

[0080] Where k is any branch in the i-segment branch, P ALL is the total output active power of the new energy plant, X k is the reactance value of the kth branch.

[0081] Total loss of new energy plants P L_ALL The calculation formula is:

[0082]

[0083] Among them, m is the number of inverters in the new energy plant, and j is the inverter serial number.

[0084] Further, we can get:

[0085]

[0086] Among them, P j is the active power of the jth inverter, Q j is the reactive power that the jth inverter needs to generate, R ij is the resistance value of the jth inverter on the i-th branch, X kj is the reactance value of the j-th inverter on the k-th branch.

[0087] Set Q j =δ j P j , where δ j is the reactive power coefficient of the jth inverter, we can get:

[0088]

[0089] Among them, Q Nj is the rated reactive power of the jth inverter, δ j is the ratio of the maximum reactive power to the active power of the jth inverter.

[0090] From the above formula we can get:

[0091]

[0092] in, It is the network structure parameter of the new energy plant. As long as the inverter does not change, the value of the network structure parameter will not change.

[0093] In order to achieve the goal of minimizing the loss in the present invention, a plurality of inverters are selected. The unit with the lowest value is assigned its reactive power coefficient δ j It is set according to the maximum value and the reactive power that can be generated is accumulated until the total reactive power meets the preset reactive power.

[0094] Based on the above content, the voltage control process of an embodiment of the present invention is as follows:

[0095] 1. Combined with the active power currently output by each inverter, calculate (the loss value of each inverter) And sort them in order from smallest to largest.

[0096] 2. The above minimum unit is set according to the maximum reactive power (rated reactive power of the first inverter) Q N1 , and calculate the reactive power that can be generated, namely ΔQ 1 =Q N1 -Q 1 , Q1 is the current reactive power output of the smallest unit.

[0097] 3. If ΔQ 1 ≥Q r , then the minimum unit output reactive power is calculated according to Q r +Q 1 Set, and the calculation ends. r is the total reactive power demand of the new energy plant. Otherwise, go to step 4.

[0098] 4. The second small unit mentioned above is set according to the maximum reactive power Q N2 , and calculate the reactive power that can be generated, namely ΔQ 2 =Q N2 -Q 2 .

[0099] 5. If ΔQ 1 +ΔQ 2 ≥Q r , then the second small unit output reactive power according to Q r -ΔQ 1 +Q 2 Set, the calculation ends. Otherwise, go to step 6.

[0100] 6. Repeat steps 4-5 until No. K s The output reactive power of the small unit is based on The calculation is finished.

[0101] Accordingly, please refer to Figure 3 A second aspect of an embodiment of the present invention provides a new energy plant voltage control system based on the minimum loss principle, wherein the new energy plant includes a plurality of inverters, each inverter is connected to a node on an AC transmission line, and the voltage of the new energy plant is controlled based on any of the above-mentioned new energy plant voltage control methods based on the minimum loss principle. The control system includes:

[0102] A loss calculation module 1, which is used to obtain the active power value of each inverter and calculate the loss value of the inverter based on the active power value;

[0103] The inverter selection module 2 is used to set the reactive power of each inverter to the rated reactive power according to the maximum value of the reactive coefficient, select an inverter in order of loss value from small to large, and calculate the sum of the reactive powers that can be output by the selected inverters;

[0104] The voltage control module 3 is used to control the voltage of the new energy plant by adjusting the reactive power values ​​output by the selected inverters based on the principle of minimum loss when the sum of the reactive power output by the selected inverters is greater than the total reactive power demand of the new energy plant.

[0105] Specifically, the calculation formula for the sum of reactive powers that can be output by the selected inverters is:

[0106]

[0107] Among them, ΔQ k is the output reactive power of the kth selected inverter, K s is the number of selected inverters;

[0108] No. K s The proposed output reactive power of the selected inverter The calculation formula is:

[0109]

[0110] in, For K s The proposed output reactive power of each inverter, Q r is the total reactive power demand of the new energy plant, For K s The current reactive power of each inverter.

[0111] Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes any of the above-mentioned new energy plant voltage control methods based on the principle of minimum loss.

[0112] Correspondingly, a fourth aspect of an embodiment of the present invention provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement any of the above-mentioned new energy plant voltage control methods based on the principle of minimum loss.

[0113] The embodiment of the present invention aims to protect a voltage control method and system for a new energy plant based on the principle of minimum loss. The new energy plant includes a plurality of inverters, each of which is connected to a node on the AC transmission line. The control method includes the following steps: obtaining the active power value of each inverter, and calculating the loss value of the inverter based on the active power value; setting the reactive power of each inverter to the rated reactive power according to the maximum value of the reactive coefficient, selecting an inverter in order of the loss value from small to large, and calculating the sum of the reactive powers that can be output by the selected inverters; when the sum of the reactive powers that can be output by the selected inverters is greater than the total reactive power demand of the new energy plant, the voltage of the new energy plant is controlled based on the principle of minimum loss by adjusting the reactive power values ​​output by the selected inverters. The above technical scheme has the following effects:

[0114] 1. By calculating the loss value of each inverter and selecting the inverter with the lowest loss value to participate in voltage regulation first, the energy efficiency of the inverter is optimized during operation, the heat loss of the inverter and the energy loss during the power conversion process are reduced, thereby improving the energy utilization efficiency of the entire new energy plant;

[0115] 2. By setting the reactive power of the inverter to its rated value and sorting and selecting according to the loss value of the inverter, the accurate output and regulation of reactive power is ensured. When the selected inverter combination can meet the total reactive power demand of the plant, the system can make timely adjustments to avoid excess or insufficient reactive power, thereby ensuring the voltage stability and power quality of the power grid;

[0116] 3. The control strategy based on the principle of minimum loss not only focuses on the operating efficiency of a single inverter, but also takes into account the loss of the entire system. By optimizing the selection of inverters and reactive power output, it reduces the overall loss of the system, reduces operating costs, and improves the economy and market competitiveness of new energy plants.

[0117] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A voltage control method for a new energy plant based on the principle of minimum loss, characterized in that: The new energy station includes a plurality of inverters, each of which is connected to a node on an AC transmission line. The control method includes the following steps: Acquiring an active power value of each of the inverters, and calculating a loss value of the inverter based on the active power value; The reactive power of each inverter is set as the rated reactive power according to the maximum value of the reactive coefficient, the inverters are selected in order from small to large according to the loss values, and the sum of the reactive powers that can be output by the selected inverters is calculated; When the sum of the reactive powers output by the selected inverters is greater than the total reactive power demand of the new energy plant, the voltage of the new energy plant is regulated by adjusting the reactive power values ​​output by the selected inverters based on the principle of minimum loss.

2. The voltage control method for a new energy plant based on the principle of minimum loss according to claim 1 is characterized in that: The calculation formula for the sum of reactive powers that can be output by the selected inverters is: Among them, ΔQ k is the output reactive power of the kth selected inverter, K s is the number of inverters that have been selected.

3. The voltage control method for a new energy plant based on the principle of minimum loss according to claim 2 is characterized in that: No. K s The proposed output reactive power of the inverter has been selected The calculation formula is: in, For K s The proposed output reactive power of the inverter, Q r is the total reactive power demand of the new energy plant, For K s The current reactive power of the inverter.

4. The voltage control method for a new energy plant based on the principle of minimum loss according to claim 2 is characterized in that: The calculation formula of the inverter loss value is: Among them, R ij is the resistance value of the i-th branch of the j-th inverter, X kj is the reactance value of the kth branch of the jth inverter, P j is the active power value of the jth inverter, P total is the total output active power of the new energy plant, n is the number of branch sections connecting the jth inverter to the PCC point; The total loss value Q of several inverters is ALL The calculation formula is: Wherein, m is the total number of inverters, δ j is the reactive power coefficient of the jth inverter.

5. The voltage control method for a new energy plant based on the principle of minimum loss according to claim 4 is characterized in that: The calculation formula of the maximum reactive power coefficient is: Among them, Q Nj is the rated reactive power of the jth inverter, P j is the active power value of the jth inverter.

6. The voltage control method for a new energy plant based on the principle of minimum loss according to any one of claims 1 to 5, characterized in that: The inverter includes: a photovoltaic inverter, a wind turbine inverter, an energy storage inverter and / or a SVG inverter.

7. A new energy plant voltage control system based on the principle of minimum loss, characterized in that: The new energy station includes a plurality of inverters, each of which is connected to a node on an AC transmission line. The voltage of the new energy station is regulated based on the voltage regulation method of the new energy station based on the minimum loss principle as described in any one of claims 1 to 6. The regulation system includes: a loss calculation module, configured to obtain an active power value of each of the inverters, and calculate a loss value of the inverter based on the active power value; An inverter selection module, which is used to set the reactive power of each inverter as the rated reactive power according to the maximum value of the reactive coefficient, select one inverter in order from small to large loss values, and calculate the sum of reactive powers that can be output by the selected inverters; A voltage control module is used to control the voltage of the new energy plant by adjusting the reactive power values ​​output by the selected several inverters based on the principle of minimum loss when the sum of the reactive power that can be output by the selected several inverters is greater than the total reactive power demand of the new energy plant.

8. The voltage control system for new energy plants based on the principle of minimum loss according to claim 7 is characterized in that: The calculation formula for the sum of reactive powers that can be output by the selected inverters is: Among them, ΔQ k is the output reactive power of the kth selected inverter, K s is the number of inverters selected; No. K s The proposed output reactive power of the inverter has been selected The calculation formula is: in, For K s The proposed output reactive power of the inverter, Q r is the total reactive power demand of the new energy plant, For K s The current reactive power of the inverter.

9. An electronic device, characterized in that: include: at least one processor; And a memory connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor executes the new energy plant voltage control method based on the minimum loss principle as described in any one of claims 1-6.

10. A computer-readable storage medium, characterized in that: Computer instructions are stored thereon, and when the instructions are executed by the processor, a new energy plant voltage control method based on the principle of minimum loss as described in any one of claims 1-6 is implemented.

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