Reactive voltage control method and device

Abstract

A reactive power voltage control method and apparatus are provided. The reactive power voltage control method includes: determining the system operating short-circuit capacity ratio of the renewable energy power station based on power flow data from control points, wherein the power flow data includes at least one of voltage, active power, and reactive power at the control points; determining the proportional coefficient and integral coefficient of a proportional-integral (PI) algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range; and performing reactive power voltage control using a PI algorithm based on the determined proportional and integral coefficients. This achieves the goal of meeting the grid's response time / speed requirements when the system operating short-circuit capacity ratio changes, and also ensures accurate grid response when grid strength changes, guaranteeing the stable operation of the power generation units at each power station. This ensures the safety and stability of the grid and the renewable energy power station, playing a crucial role in stabilizing the voltage of the grid and the renewable energy power station.

Description

Technical Field

[0001] This disclosure relates to the field of power technology. More specifically, this disclosure relates to a reactive power voltage control method and apparatus. Background Technology

[0002] With the continued increase in the penetration rate of renewable energy into the power system and the implementation of the Paris Agreement, the proportion of traditional energy sources globally will inevitably continue to decline. Renewable energy sources such as wind and solar power, due to their inherent characteristics, cannot provide strong voltage and frequency support for the power grid. Therefore, the short-circuit capacity of the power grid will continue to decrease, and the grid will continue to weaken, bringing unprecedented challenges to the control of renewable energy power plants. Global renewable energy manufacturers and developers, as well as grid operators, are all facing the technical difficulties of controlling weak grids.

[0003] The system operating short-circuit capacity ratio (SCR) is a measure of the system's short-circuit capacity divided by the equipment capacity. A high SCR indicates that the equipment is connected to a strong system, meaning that switching the equipment has little impact on the system. Such a power grid is called a strong grid, and vice versa. The short-circuit capacity, under unit voltage, is numerically equal to the system admittance, which is the reciprocal of the system's Thevenin equivalent impedance. A larger short-circuit capacity results in a smaller Thevenin equivalent resistance, meaning that switching loads, parallel capacitors, or reactors will not cause large changes in voltage amplitude, thus indicating a stronger system, and vice versa. Major renewable energy sources such as wind and solar power exhibit significant instability. When they become the primary energy source, the lack of inertia to provide damping for the system, unlike traditional thermal / hydropower, not only leads to a decrease in the system's SCR but also causes the SCR to fluctuate constantly, posing challenges to grid control.

[0004] Traditional reactive power control schemes, once the control parameters are determined during system installation and commissioning, do not adjust accordingly to changes in the system's operating mode. This means that when the system's operating mode changes, the previously determined control parameters may no longer match, leading to the system failing to meet grid requirements and even causing renewable energy power plants to disconnect from the grid, thus affecting the safe and stable operation of the system.

[0005] Currently, in the reactive power and voltage control of new energy (wind farms / photovoltaic power plants), the core control is based on the assumption that the system SCR is fixed. This control method did not cause significant control problems in the past because: (1) the requirements for reactive power response speed in strong grid control are relatively low; (2) the SCR of the new energy power plant grid connection point does not change much. However, these two conditions are no longer applicable. When the system SCR changes (such as system maintenance, remote faults, wind / sunlight changes, etc.), the previously stable control parameters may cause system instability, causing oscillations or even grid disconnection. Given that global power grids have put forward clear requirements for the reactive power response speed of new energy power plants in recent years, and the unpredictability of system SCR caused by the large-scale access of new energy, a control method is needed that can meet the grid's requirements for response time / speed even when the system SCR changes. Summary of the Invention

[0006] Exemplary embodiments of this disclosure provide a reactive voltage control method and apparatus to meet the power grid's requirements for response time / speed when the system SCR changes.

[0007] According to an exemplary embodiment of this disclosure, a reactive power voltage control method is provided, comprising: determining the system operating short-circuit capacity ratio of a new energy power station based on power flow data of a control point, wherein the power flow data includes at least one of voltage, active power, and reactive power of the control point; determining the proportional coefficient and integral coefficient of a proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range; and performing reactive power voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.

[0008] Optionally, the step of determining the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control points of the new energy power station may include: calculating the power flow change data of the control points of the new energy power station based on the power flow data of the control points of the new energy power station; and determining the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control points of the new energy power station, the power flow change data, the rated voltage of the control points of the new energy power station, and the rated power of the new energy power station.

[0009] Optionally, the step of determining the system operating short-circuit capacity ratio of the new energy power station based on the power flow data and power flow change data of the control point of the new energy power station, as well as the rated voltage of the control point of the new energy power station and the rated power of the new energy power station may include: calculating the system impedance of the control point of the new energy power station based on the power flow data and power flow change data of the control point of the new energy power station; and determining the system operating short-circuit capacity ratio of the new energy power station based on the system impedance of the control point of the new energy power station, the rated voltage of the control point of the new energy power station, and the rated power of the new energy power station.

[0010] Optionally, the step of determining the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range may include: when the system operating short-circuit capacity ratio is within the predetermined range, determining the proportional coefficient and integral coefficient of the proportional-integral algorithm from a predetermined control parameter table based on the power flow data of the control points of the new energy power station and the system operating short-circuit capacity ratio; when the system operating short-circuit capacity ratio is not within the predetermined range, keeping the current proportional coefficient and integral coefficient of the proportional-integral algorithm unchanged.

[0011] Optionally, the predetermined range of the system operating short-circuit capacity ratio can be determined based on the system maximum operating short-circuit capacity ratio and the system minimum operating short-circuit capacity ratio of the new energy power station, and the control parameter table can be generated based on the proportional coefficients and integral coefficients of the proportional-integral algorithm under different power flow conditions and system operating short-circuit capacity ratio combinations.

[0012] Optionally, the lower limit of the predetermined range of the system operating short-circuit capacity ratio may be greater than or equal to the minimum operating short-circuit capacity ratio of the system, and the upper limit may be less than or equal to the maximum operating short-circuit capacity ratio of the system.

[0013] According to an exemplary embodiment of this disclosure, a reactive power voltage control device is provided, comprising: a capacity ratio determination unit configured to determine the system operating short-circuit capacity ratio of a renewable energy power station based on power flow data of a control point of the renewable energy power station, wherein the power flow data includes at least one of voltage, active power, and reactive power of the control point; a coefficient determination unit configured to determine the proportional coefficient and integral coefficient of a proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range; and a reactive power control unit configured to perform reactive power voltage control using a proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.

[0014] Optionally, the capacity ratio determination unit can be configured to: calculate the power flow change data of the control points of the new energy power station based on the power flow data of the control points; and determine the system operating short-circuit capacity ratio of the new energy power station based on the power flow data and power flow change data of the control points of the new energy power station, as well as the rated voltage of the control points of the new energy power station and the rated power of the new energy power station.

[0015] Optionally, the capacity ratio determination unit can be configured to: calculate the system impedance of the control point of the new energy power station based on the power flow data and power flow change data of the control point; and determine the system operating short-circuit capacity ratio of the new energy power station based on the system impedance of the control point, the rated voltage of the control point, and the rated power of the new energy power station.

[0016] Optionally, the coefficient determination unit can be configured to: when the system operating short-circuit capacity ratio is within a predetermined range, determine the proportional coefficient and integral coefficient of the proportional-integral algorithm from a predetermined control parameter table based on the power flow data of the control point of the new energy power station and the system operating short-circuit capacity ratio; when the system operating short-circuit capacity ratio is not within the predetermined range, keep the current proportional coefficient and integral coefficient of the proportional-integral algorithm unchanged.

[0017] Optionally, the predetermined range of the system operating short-circuit capacity ratio can be determined based on the system maximum operating short-circuit capacity ratio and the system minimum operating short-circuit capacity ratio of the new energy power station, and the control parameter table can be generated based on the proportional coefficients and integral coefficients of the proportional-integral algorithm under different power flow conditions and system operating short-circuit capacity ratio combinations.

[0018] Optionally, the lower limit of the predetermined range of the system operating short-circuit capacity ratio may be greater than or equal to the minimum operating short-circuit capacity ratio of the system, and the upper limit may be less than or equal to the maximum operating short-circuit capacity ratio of the system.

[0019] According to an exemplary embodiment of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.

[0020] According to an exemplary embodiment of the present disclosure, a computing device is provided, comprising: at least one processor; and at least one memory storing a computer program, wherein when the computer program is executed by the at least one processor, a reactive voltage control method according to an exemplary embodiment of the present disclosure is implemented.

[0021] According to an exemplary embodiment of the present disclosure, a computer program product is provided, wherein the instructions in the computer program product are executable by a processor of a computer device to perform a reactive voltage control method according to an exemplary embodiment of the present disclosure.

[0022] The reactive power voltage control method and apparatus according to the exemplary embodiments of this disclosure determine the system operating short-circuit capacity ratio of the renewable energy power station based on the power flow data of the control point of the renewable energy power station, determine the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range, and use the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient to perform reactive power voltage control. This achieves the goal of meeting the grid's response time / speed requirements when the system SCR changes, and also achieves accurate response to the grid when the grid strength changes, ensuring the stable operation of the power generation units of each power station, guaranteeing the safety and stability of the grid and renewable energy power stations, and playing an extremely important role in the voltage stability of the grid and renewable energy power stations.

[0023] Further aspects and / or advantages of the general concept of this disclosure will be set forth in part in the description which follows, and in part will be clear from the description or may be learned by practice of the general concept of this disclosure. Attached Figure Description

[0024] The above and other objects and features of exemplary embodiments of this disclosure will become clearer from the following description taken in conjunction with the accompanying drawings, which exemplarily illustrate the embodiments, wherein:

[0025] Figure 1 A flowchart illustrating a reactive voltage control method according to an exemplary embodiment of the present disclosure is shown.

[0026] Figure 2 A block diagram illustrating a reactive voltage control device according to an exemplary embodiment of the present disclosure; and

[0027] Figure 3 A schematic diagram of a computing device according to an exemplary embodiment of the present disclosure is shown. Detailed Implementation

[0028] Exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings, examples of which are illustrated in the drawings, wherein the same reference numerals always refer to the same components. The embodiments will now be described with reference to the accompanying drawings in order to explain the present disclosure.

[0029] Figure 1 A flowchart illustrating a reactive voltage control method according to an exemplary embodiment of the present disclosure is shown. The reactive voltage control method according to an exemplary embodiment of the present disclosure is applicable to various grid strengths.

[0030] Reference Figure 1 In step S101, the system operating short-circuit capacity ratio of the new energy power station is determined based on the power flow data of the control points of the new energy power station.

[0031] In exemplary embodiments of this disclosure, power flow data may include voltage, active power, and reactive power at control points.

[0032] In an exemplary embodiment of this disclosure, when determining the system operating short-circuit capacity ratio of a new energy power station based on the power flow data of the control point of the new energy power station, the power flow change data of the control point of the new energy power station can be calculated first based on the power flow data of the control point of the new energy power station, and then the system operating short-circuit capacity ratio of the new energy power station can be determined according to the power flow data of the control point of the new energy power station, the power flow change data, the rated voltage of the control point of the new energy power station, and the rated power of the new energy power station.

[0033] In an exemplary embodiment of this disclosure, when determining the system operating short-circuit capacity ratio of a new energy power station based on the power flow data and power flow change data of the control point of the new energy power station, as well as the rated voltage of the control point of the new energy power station and the rated power of the new energy power station, the system impedance of the control point of the new energy power station can be calculated first based on the power flow data and power flow change data of the control point of the new energy power station, and then the system operating short-circuit capacity ratio of the new energy power station can be determined based on the system impedance of the control point of the new energy power station, the rated voltage of the control point of the new energy power station, and the rated power of the new energy power station.

[0034] For example, the system impedance of the control point of the renewable energy power station can be calculated first based on the current measured voltage U1, active power P1, and reactive power Q1 at the control point, as well as the voltage change between the current and previous measurements. This can be done using the formulas ΔU1 = (P1R + Q1X) / U1 and δU1 = (P1X - Q1R) / U1. Here, ΔU1 is the real part of the voltage change, δU1 is the imaginary part, R is the resistance, and X is the reactance. After obtaining the system impedance, the formula... To calculate the system's short-circuit capacity ratio (SCR) in real time. Here, P wf It is the rated power (i.e., capacity) of the new energy power station, U n It is the rated voltage of the control point.

[0035] Specifically, each renewable energy power station has one grid connection point and one or more control points. The grid connection point of a renewable energy power station may or may not be a control point. When a renewable energy power station has multiple control points, the system operating short-circuit capacity ratio of the renewable energy power station can be determined based on the power flow data of all control points. When a renewable energy power station has multiple control points, given that the capacity of the power generation units (e.g., but not limited to, wind turbines) cluster under each control point is very small relative to the entire system, all power generation units under that control point can be controlled as a cluster / an independent renewable energy power station; that is, when there are multiple control points, each control point can be treated as a renewable energy power station, thus controlling multiple control points as multiple renewable energy power stations separately, and the control method for multiple control points can be the same as the control method for a single control point.

[0036] In step S102, the proportional coefficient and integral coefficient of the proportional-integral algorithm are determined based on whether the system operating short-circuit capacity ratio is within a predetermined range.

[0037] In an exemplary embodiment of this disclosure, when determining the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range, the proportional coefficient and integral coefficient of the proportional-integral algorithm can be determined from a predetermined control parameter table based on the power flow data of the control point of the new energy power station and the system operating short-circuit capacity ratio when the system operating short-circuit capacity ratio is within the predetermined range; when the system operating short-circuit capacity ratio is not within the predetermined range, the proportional coefficient and integral coefficient of the current proportional-integral algorithm remain unchanged.

[0038] In an exemplary embodiment of this disclosure, the predetermined range of the system operating short-circuit capacity ratio can be determined based on the system's maximum operating short-circuit capacity ratio and the system's minimum operating short-circuit capacity ratio at the renewable energy power plant. For example, power system simulation software (e.g., but not limited to PSSE, PSCAD, DIgsilent, BPA, MATLAB, etc.) can be invoked to perform N-1 to N-4 faults to obtain the system's maximum and minimum SCR.

[0039] In exemplary embodiments of this disclosure, the lower limit of a predetermined range for the system operating short-circuit capacity ratio (SCR) may be greater than or equal to the system minimum operating short-circuit capacity ratio, and the upper limit may be less than or equal to the system maximum operating short-circuit capacity ratio. For example, the calculated maximum SCR of the system (SCR) can be used as the upper limit. max ) and minimum SCR (SCR min This serves as a predetermined range for the SCR (Solution Response Rate). During operation, the validity of the real-time calculated SCR is determined by checking whether it falls within this predetermined range. If the calculated SCR is less than the predetermined range... max And greater than SCR min If the calculated SCR is positive, it means the calculated SCR is valid; otherwise, it means the calculated SCR is invalid. If the calculated SCR is invalid, there may be errors in the input / acquired data. Therefore, the calculated SCR is discarded, and the control parameters obtained from the previous table lookup are maintained.

[0040] In an exemplary embodiment of this disclosure, the control parameter table can be generated based on the proportional coefficients and integral coefficients of the proportional-integral algorithm under different power flow conditions and system operating short-circuit capacity ratio combinations, thereby incorporating the simulation control results and applying them to the actual control strategy, effectively solving the problem that traditional control schemes cannot adapt to different power grid strengths.

[0041] As an example, simulations can be used to change all possible operating modes of the system, thereby altering the Sac and obtaining all different possible SCRs. These different possible SCRs can then be used to combine various wind farm operating conditions, and simulations can be conducted to obtain the optimal control parameters. Here, "operating mode" is a technical term in power systems, referring to whether important transmission lines / power plants are disconnected or out of service for maintenance. The operating mode where all equipment is operational is called the maximum operating mode.

[0042] For example, under different power flow conditions (P, Q, V) and SCR combinations, simulations are run by modifying the control parameter table (e.g., but not limited to, the proportional and integral coefficients of the proportional-integral algorithm), recording the control parameters that achieve the best reactive power voltage control effect, and generating a control parameter table for optimal reactive power voltage control. This can be achieved using the formula SCR = Sac / P. wf To determine the various possible SCRs. Here, Sac is the short-circuit capacity of the system, and P... wf This refers to the capacity of the renewable energy power station. Sac can change when the system's operating mode changes, and remains unchanged when the system's operating mode remains the same. P wf When there is no change in the new energy power station, it can be considered unchanged.

[0043] Furthermore, in the exemplary embodiments of this disclosure, power flow data of the power generation units can be acquired to determine the current operating status of the power generation units and prevent the adjustment process from causing the power generation units to disconnect from the grid. For example, when the voltage of a power generation unit exceeds a given upper limit threshold, capacitive reactive power commands are no longer issued to this power generation unit to prevent the voltage from continuing to rise and disconnecting from the grid; similarly, when the voltage of a power generation unit is lower than a given lower limit threshold, inductive reactive power commands are no longer issued to this power generation unit to prevent the voltage from continuing to drop and disconnecting from the grid. Simultaneously monitoring the reactive power of the power generation units allows for real-time calculation of the reserve reactive power of the power generation units, facilitating the optimization of the control algorithm and ensuring a relatively balanced reactive power output among the various power generation units.

[0044] In step S103, reactive voltage control is performed using a proportional-integral algorithm based on determined proportional and integral coefficients.

[0045] Furthermore, according to exemplary embodiments of the present disclosure, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed, implements the reactive voltage control method according to exemplary embodiments of the present disclosure.

[0046] In an exemplary embodiment of this disclosure, the computer-readable storage medium may carry one or more programs that, when executed, can perform the following steps: determining the system operating short-circuit capacity ratio of the new energy power station based on power flow data from the control points of the new energy power station, wherein the power flow data includes at least one of the voltage, active power, and reactive power of the control points; determining the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range; and performing reactive voltage control using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.

[0047] Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In embodiments of this disclosure, a computer-readable storage medium can be any tangible medium that contains or stores a computer program that can be used by or in conjunction with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable storage medium can be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof. A computer-readable storage medium can be included in any apparatus; it can also exist independently without being assembled into that apparatus.

[0048] Furthermore, according to exemplary embodiments of the present disclosure, a computer program product is also provided, wherein the instructions in the computer program product are executable by a processor of a computer device to perform a method for reactive voltage control according to exemplary embodiments of the present disclosure.

[0049] The above has been combined Figure 1 A reactive voltage control method according to exemplary embodiments of the present disclosure has been described. Hereinafter, reference will be made to... Figure 2 A reactive voltage control device and its units according to exemplary embodiments of the present disclosure will be described.

[0050] Figure 2 A block diagram of a reactive voltage control device according to an exemplary embodiment of the present disclosure is shown.

[0051] Reference Figure 2 The reactive power control device includes a capacity ratio determination unit 21, a coefficient determination unit 22, and a reactive power control unit 23.

[0052] The capacity ratio determination unit 21 is configured to determine the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control points of the new energy power station.

[0053] In an exemplary embodiment of this disclosure, power flow data may include at least one of the voltage, active power, and reactive power of a control point.

[0054] In an exemplary embodiment of this disclosure, the capacity ratio determination unit 21 may be configured to: calculate the power flow change data of the control point of the new energy power station based on the power flow data of the control point of the new energy power station; and determine the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control point of the new energy power station, the power flow change data, the rated voltage of the control point of the new energy power station, and the rated power of the new energy power station.

[0055] In an exemplary embodiment of this disclosure, the capacity ratio determination unit 21 may be configured to: calculate the system impedance of the control point of the new energy power station based on the power flow data and power flow change data of the control point of the new energy power station; and determine the system operating short-circuit capacity ratio of the new energy power station based on the system impedance of the control point of the new energy power station, the rated voltage of the control point of the new energy power station, and the rated power of the new energy power station.

[0056] The coefficient determination unit 22 is configured to determine the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the short-circuit capacity ratio of the system is within a predetermined range.

[0057] In an exemplary embodiment of this disclosure, the coefficient determination unit 22 may be configured to: when the system operating short-circuit capacity ratio is within a predetermined range, determine the proportional coefficient and integral coefficient of the proportional-integral algorithm from a predetermined control parameter table based on the power flow data of the control point of the new energy power station and the system operating short-circuit capacity ratio; and when the system operating short-circuit capacity ratio is not within the predetermined range, keep the current proportional coefficient and integral coefficient of the proportional-integral algorithm unchanged.

[0058] In an exemplary embodiment of this disclosure, the predetermined range of the system operating short-circuit capacity ratio can be determined based on the maximum and minimum operating short-circuit capacity ratios of the new energy power station, and the control parameter table can be generated based on the proportional and integral coefficients of the proportional-integral algorithm under different predetermined power flow conditions and combinations of system operating short-circuit capacity ratios.

[0059] In an exemplary embodiment of this disclosure, the lower limit of a predetermined range of the system operating short-circuit capacity ratio may be greater than or equal to the minimum operating short-circuit capacity ratio of the system, and the upper limit may be less than or equal to the maximum operating short-circuit capacity ratio of the system.

[0060] The reactive power control unit 23 is configured to perform reactive voltage control using a proportional-integral algorithm based on a defined proportional coefficient and integral coefficient.

[0061] The above has been combined Figure 2 A reactive voltage control device according to exemplary embodiments of the present disclosure has been described. Next, in conjunction with... Figure 3 A computing device according to exemplary embodiments of the present disclosure will be described.

[0062] Figure 3 A schematic diagram of a computing device according to an exemplary embodiment of the present disclosure is shown.

[0063] Reference Figure 3 The computing device 3 according to an exemplary embodiment of the present disclosure includes a memory 31 and a processor 32. The memory 31 stores a computer program, which, when executed by the processor 32, implements a reactive voltage control method according to an exemplary embodiment of the present disclosure.

[0064] In an exemplary embodiment of this disclosure, when the computer program is executed by the processor 32, the following steps can be implemented: determining the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control point of the new energy power station, wherein the power flow data includes at least one of the voltage, active power, and reactive power of the control point; determining the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the system operating short-circuit capacity ratio is within a predetermined range; and performing reactive voltage control using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient.

[0065] Figure 3 The computing device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments disclosed herein.

[0066] The above has been referred to Figures 1 to 3 A reactive voltage control method and apparatus according to exemplary embodiments of the present disclosure are described. However, it should be understood that: Figure 2 The reactive voltage control device and its units shown can be configured as software, hardware, firmware, or any combination thereof to perform specific functions. Figure 2 The computing device shown is not limited to the components shown above, but some components may be added or removed as needed, and the above components may also be combined.

[0067] The reactive power voltage control method and apparatus according to the exemplary embodiments of this disclosure determine the system operating short-circuit capacity ratio of the renewable energy power station based on power flow data from the control points of the renewable energy power station. Based on whether the system operating short-circuit capacity ratio is within a predetermined range, the proportional coefficient and integral coefficient of the proportional-integral algorithm are determined. Reactive power voltage control is performed using the proportional-integral algorithm based on the determined proportional coefficient and integral coefficient. This achieves the goal of meeting the grid's response time / speed requirements when the system SCR changes, and also enables accurate response to the grid when the grid strength changes, ensuring the stable operation of the power generation units of each power station. This guarantees the safety and stability of the grid and the renewable energy power station, playing a crucial role in the voltage stability of the grid and the renewable energy power station.

[0068] Although this disclosure has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art should understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the claims.

Claims

1. A reactive power voltage control method, characterized in that, The reactive voltage control method includes: Based on the power flow data of the control points of the new energy power station, the system operation short-circuit capacity ratio of the new energy power station is determined. The power flow data includes the voltage, active power and reactive power of the control points. Based on whether the system operating short-circuit capacity ratio is within a predetermined range, the proportional coefficient and integral coefficient of the proportional-integral algorithm corresponding to the power flow data and the current system operating short-circuit capacity ratio are determined. When the system operating short-circuit capacity ratio is within a predetermined range, the proportional coefficient and the integral coefficient are determined from a predetermined control parameter table based on the power flow data of the control point of the new energy power station and the system operating short-circuit capacity ratio. Reactive power voltage control is achieved using a proportional-integral algorithm based on defined proportional and integral coefficients. The steps for determining the system operating short-circuit capacity ratio of new energy power stations based on power flow data from control points include: Based on the power flow data of the control points of the new energy power stations, calculate the power flow change data of the control points of the new energy power stations; The system operating short-circuit capacity ratio of the new energy power station is determined based on the power flow data and power flow change data of the control points of the new energy power station, as well as the rated voltage of the control points and the rated power of the new energy power station. The steps for determining the system operating short-circuit capacity ratio of a new energy power station based on power flow data, power flow change data, rated voltage of the control point, and rated power of the new energy power station include: In response to changes in the operation mode of renewable energy power stations, the system impedance of the control points of renewable energy power stations is calculated based on the voltage, active power, reactive power, and power flow change data of the control points. The system operating short-circuit capacity ratio is determined based on the system impedance, the rated voltage, and the rated power. The predetermined range is determined based on the maximum operating short-circuit capacity ratio and the minimum operating short-circuit capacity ratio of the new energy power station. The control parameter table is generated based on the proportional coefficients and integral coefficients of the proportional-integral algorithm under different power flow conditions and combinations of system operating short-circuit capacity ratios.

2. The method according to claim 1, characterized in that, The steps for determining the proportional coefficient and integral coefficient of the proportional-integral algorithm based on whether the short-circuit capacity ratio of the system is within a predetermined range include: When the short-circuit capacity ratio of the system is not within the predetermined range, the proportional coefficient and integral coefficient of the current proportional-integral algorithm remain unchanged.

3. The method according to claim 1 or 2, characterized in that, The lower limit of the predetermined range of the system operating short-circuit capacity ratio is greater than or equal to the system minimum operating short-circuit capacity ratio, and the upper limit is less than or equal to the system maximum operating short-circuit capacity ratio.

4. A reactive power voltage control device, characterized in that, The reactive power control device includes: The capacity ratio determination unit is configured to determine the system operating short-circuit capacity ratio of the new energy power station based on the power flow data of the control points. The power flow data includes the voltage, active power and reactive power of the control points. The coefficient determination unit is configured to determine the proportional coefficient and integral coefficient of the proportional-integral algorithm corresponding to the power flow data and the current system operating short-circuit capacity ratio based on whether the system operating short-circuit capacity ratio is within a predetermined range. Specifically, when the system operating short-circuit capacity ratio is within the predetermined range, the proportional coefficient and integral coefficient are determined from a predetermined control parameter table based on the power flow data of the control points of the renewable energy power station and the system operating short-circuit capacity ratio. The reactive power control unit is configured to perform reactive power voltage control using a proportional-integral algorithm based on determined proportional and integral coefficients. The capacity ratio determination unit is configured as follows: Based on the power flow data of the control points of the new energy power stations, calculate the power flow change data of the control points of the new energy power stations; The system operating short-circuit capacity ratio of the new energy power station is determined based on the power flow data and power flow change data of the control points of the new energy power station, as well as the rated voltage of the control points and the rated power of the new energy power station. The capacity ratio determination unit is configured as follows: In response to changes in the operation mode of renewable energy power stations, the system impedance of the control points of renewable energy power stations is calculated based on the voltage, active power, reactive power, and power flow change data of the control points. The system operating short-circuit capacity ratio is determined based on the system impedance, the rated voltage, and the rated power. The predetermined range is determined based on the maximum operating short-circuit capacity ratio and the minimum operating short-circuit capacity ratio of the new energy power station. The control parameter table is generated based on the proportional coefficients and integral coefficients of the proportional-integral algorithm under different power flow conditions and combinations of system operating short-circuit capacity ratios.

5. The apparatus according to claim 4, characterized in that, The coefficient determination unit is configured as follows: When the short-circuit capacity ratio of the system is not within the predetermined range, the proportional coefficient and integral coefficient of the current proportional-integral algorithm remain unchanged.

6. The apparatus according to claim 4 or 5, characterized in that, The lower limit of the predetermined range of the system operating short-circuit capacity ratio is greater than or equal to the system minimum operating short-circuit capacity ratio, and the upper limit is less than or equal to the system maximum operating short-circuit capacity ratio.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the reactive voltage control method according to any one of claims 1 to 3.

8. A computing device, characterized in that, The computing device includes: At least one processor; At least one memory stores a computer program that, when executed by the at least one processor, implements the reactive voltage control method according to any one of claims 1 to 3.

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