Automatic voltage control method, device and non-volatile storage medium

Abstract

The application discloses an automatic voltage control method and device and a nonvolatile storage medium. The method comprises the following steps: obtaining a plurality of active power prediction values of a target transformer substation at a plurality of time points; determining a target time period according to the plurality of active power prediction values; obtaining a target voltage value of the target transformer substation at a target time point, wherein the target time point is located in the target time period, and the target voltage value represents a high-voltage side bus voltage of the target transformer substation; and generating a voltage control scheme according to the plurality of active power prediction values and the target voltage value, wherein the voltage control scheme is used for controlling the reactive power of the target transformer substation to keep balance. The application solves the technical problem that the power grid operates in a non-safe and stable state due to the fact that the traditional voltage control method cannot quickly adjust the voltage to a reasonable range.

Description

Technical Field

[0001] This invention relates to the field of power grid control technology, and more specifically, to an automatic voltage control method, device, and non-volatile storage medium. Background Technology

[0002] Automatic Voltage Control (AVC) systems are crucial for ensuring the safe (improved voltage stability margin), economical (reduced network losses), and high-quality (improved voltage qualification rate) operation of power transmission networks. Built upon the Power Grid Energy Management System (EMS), the AVC system utilizes real-time operational data from the power grid to scientifically determine the optimal reactive power and voltage adjustment scheme from a global network optimization perspective, automatically distributing the scheme to power plants, substations, and lower-level grid dispatching agencies for execution.

[0003] New energy sources have become the preferred option for many regions with suitable conditions to promote clean energy substitution, forming new energy aggregation zones. Their grid-connected capacity is growing rapidly, bringing new challenges to power grid dispatch and operation. On the one hand, some areas close to load centers, such as the coastal areas of developed coastal cities, with year-round winds, are very suitable for meeting the active power demands of load centers. On the other hand, the large-scale centralized development model in these areas lacks the reactive power and voltage support of conventional hydropower and thermal power plants, resulting in a smaller system short-circuit capacity. The inherent intermittent changes in active power generation from new energy sources can cause significant voltage fluctuations, posing considerable difficulties for voltage regulation.

[0004] In power systems, especially in areas with a large proportion of renewable energy installed capacity, active power changes can be significant and rapid, leading to substantial voltage fluctuations in the power grid. Traditional AVC control methods, which rely solely on reactive power voltage conditions at a single moment, may fail to quickly adjust the voltage to a reasonable range during periods of large grid load changes. Furthermore, this can result in repeated switching of reactive power equipment, shortening equipment lifespan and causing economic losses, while also contributing to significant voltage fluctuations that negatively impact the safe and stable operation of the power grid.

[0005] There is currently no effective solution to the above problems. Summary of the Invention

[0006] This invention provides an automatic voltage control method, apparatus, and non-volatile storage medium to at least solve the technical problem that the power grid operates in an unsafe and unstable state because traditional voltage control methods cannot quickly adjust the voltage to a reasonable range.

[0007] According to one aspect of the present invention, an automatic voltage control method is provided, comprising: acquiring multiple active power prediction values ​​of a target substation at multiple times; determining a target time period based on the multiple active power prediction values; acquiring a target voltage value of the target substation at a target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation; and generating a voltage control scheme based on the multiple active power prediction values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0008] Optionally, the method involves obtaining multiple active power prediction values ​​for the target substation at multiple times, including: obtaining power data for each circuit in the power grid and the grid's connection relationships, wherein the target substation is located within the power grid; calculating a first active power sensitivity and a second active power sensitivity using a steady-state sensitivity analysis method based on the connection relationships and current and voltage data, wherein the first active power sensitivity is the active power sensitivity of multiple generators in the power grid to the target substation, and the second active power sensitivity is the active power sensitivity of multiple loads in the power grid to the target substation; obtaining power prediction values ​​for multiple loads and planned generation values ​​for multiple generators at multiple times; and determining multiple active power prediction values ​​for the target substation based on the first active power sensitivity, the second active power sensitivity, the power prediction values, and the planned generation values.

[0009] Optionally, the target time period is determined based on multiple predicted active power values ​​corresponding to multiple times, including: determining multiple unit time periods based on multiple times, and calculating multiple rates of change of power of the target substation within the multiple unit time periods; and determining the target time period based on the unit time period corresponding to the rate of change exceeding a first threshold among the multiple rates of change.

[0010] Optionally, the target time period is determined based on the unit time period corresponding to the rate of change exceeding the first threshold among multiple rates of change, including: Step 1: Determine whether the number of unit time periods in which the power change of the target substation exceeds the second threshold within the first unit time period and the first number of consecutive unit time periods after the first unit time period exceeds the second number, wherein the first unit time period is any one of the unit time periods corresponding to the rate of change exceeding the first threshold among multiple rates of change; Step 2: If the number of unit time periods in which the power change of the target substation exceeds the second threshold within the first unit time period and the first number of unit time periods after the first unit time period exceeds the second number, determine the first unit time period and the first number of unit time periods after the first unit time period as sub-target time periods; Step 1 to Step 2 are executed sequentially for each unit time period in the unit time periods corresponding to the rate of change exceeding the first threshold among multiple rates of change to obtain multiple sub-target time periods, wherein the target time period includes multiple sub-target time periods.

[0011] Optionally, a voltage control scheme is generated based on multiple active power prediction values ​​and a target voltage value, including: acquiring the real-time voltage of the target substation at the target time; and generating a voltage control scheme based on the active power prediction value, real-time voltage, and target voltage value of the target substation within the target time period.

[0012] Optionally, a voltage control scheme is generated based on the predicted active power, real-time voltage, and target voltage value of the target substation within the target time period. This includes: determining the rise and fall of the active load within the target time period based on the predicted active power of the target substation within the target time period; generating a first voltage control scheme when the active load is rising and the real-time voltage is less than the target voltage value within the target time period, wherein the voltage control scheme includes the first voltage control scheme; and generating a second voltage control scheme when the active load is falling and the real-time voltage is higher than the target voltage value within the target time period, wherein the voltage control scheme includes the second voltage control scheme.

[0013] Optionally, the method further includes: obtaining a pre-set dead zone parameter, wherein the dead zone parameter represents the range of allowable real-time voltage fluctuations; determining that the real-time voltage is greater than the target voltage value when the real-time voltage is higher than the target voltage value and the absolute value of the difference is greater than the dead zone parameter; and determining that the real-time voltage is less than the target voltage value when the real-time voltage is lower than the target voltage value and the absolute value of the difference is greater than the dead zone parameter.

[0014] According to another aspect of the present invention, an automatic voltage control device is also provided, comprising: a first acquisition module, configured to acquire multiple active power prediction values ​​of a target substation at multiple times; a determination module, configured to determine a target time period based on the multiple active power prediction values; a second acquisition module, configured to acquire a target voltage value of the target substation at a target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation; and a generation module, configured to generate a voltage control scheme based on the multiple active power prediction values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0015] According to another aspect of the present invention, a non-volatile storage medium is also provided, the non-volatile storage medium including a stored program, wherein, when the program is running, it controls the device where the non-volatile storage medium is located to execute any of the above-described automatic voltage control methods.

[0016] According to another aspect of the present invention, a computer device is also provided, the computer device including a processor, the processor being configured to run a program, wherein the program executes any of the above-described automatic voltage control methods during runtime.

[0017] In this embodiment of the invention, multiple active power prediction values ​​of the target substation at multiple times are obtained; a target time period is determined based on the multiple active power prediction values; a target voltage value of the target substation at a target time is obtained, wherein the target time is within the target time period, and the target voltage value represents the high-voltage bus voltage of the target substation; a voltage control scheme is generated based on the multiple active power prediction values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance, thereby achieving the purpose of flexibly adjusting the grid voltage during periods of large fluctuations in load active power or generator active power, thus realizing the technical effect of flexibly adjusting the grid voltage during periods of large fluctuations in load active power or generator active power, and solving the technical problem that the traditional voltage control method cannot quickly adjust the voltage to a reasonable range, causing the grid to operate in an unsafe and unstable state. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a computer terminal for implementing an automatic voltage control method is shown.

[0020] Figure 2 This is a flowchart illustrating the automatic voltage control method provided according to an embodiment of the present invention;

[0021] Figure 3 This is a structural block diagram of an automatic voltage control device provided according to an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] According to an embodiment of the present invention, an embodiment of an automatic voltage control method is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0025] The method embodiment provided in Embodiment 1 of this application can be executed on a mobile terminal, computer terminal, or similar computing device. Figure 1 A hardware block diagram of a computer terminal for implementing an automatic voltage control method is shown. Figure 1 As shown, the computer terminal 10 may include one or more processors (shown as 102a, 102b, ..., 102n in the figure) (the processor may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of a BUS bus), a network interface, a power supply, and / or a camera. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the aforementioned electronic device. For example, computer terminal 10 may also include... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0026] It should be noted that the aforementioned one or more processors and / or other data processing circuits are generally referred to herein as "data processing circuits". These data processing circuits may be implemented wholly or partially as software, hardware, firmware, or any other combination thereof. Furthermore, the data processing circuits may be a single, independent processing module, or may be wholly or partially integrated into any other element in the computer terminal 10. As involved in the embodiments of this application, the data processing circuits serve as processor control (e.g., selection of a variable resistor termination path connected to an interface).

[0027] The memory 104 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the automatic voltage control method in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory 104, thereby realizing the automatic voltage control method of the application described above. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor, and these remote memories can be connected to the computer terminal 10 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0028] The display may be, for example, a touchscreen liquid crystal display (LCD) that allows the user to interact with the user interface of the computer terminal 10.

[0029] Figure 2 This is a flowchart illustrating the automatic voltage control method provided according to an embodiment of the present invention, as shown below. Figure 2 As shown, the method includes the following steps:

[0030] Step S202: Obtain multiple active power prediction values ​​of the target substation at multiple times.

[0031] In this step, the target substation is the one where the automatic voltage control method is implemented. There are many substations in the power grid. During automatic voltage control, the voltage of each level of the busbars at the target substation is monitored and regulated on a per-substation basis. When monitoring and regulating the target substation, calculations can be performed based on the substation's operating status that day to obtain multiple predicted active power values ​​for the target substation at various times on the following day, with each time point corresponding to one predicted active power value. Preferably, the following day can be divided into 96 time points, with a 15-minute time interval between any two adjacent time points.

[0032] Step S204: Determine the target time period based on multiple active power prediction values.

[0033] In this step, based on the predicted values ​​of multiple active power, the target time period that requires special attention to the target substation on the second day can be calculated and determined. The time period that requires special attention is the period during which the active power of the target substation will change significantly, such as the active power rising period and the active power falling period.

[0034] Step S206: Obtain the target voltage value of the target substation at the target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation.

[0035] In this step, the target voltage value of the target substation at the target time is obtained. The target time is a moment within the target time period. At this point, compared to the previous two steps, it is already the second day, and the target time is a moment within the second day. Within the second day, within the target time period selected from the previous day that requires special attention, automatic voltage control methods need to be implemented on the target substation. The target voltage value is obtained by reactive power optimization calculations based on the current voltage and current data of the power grid.

[0036] Step S208: Based on multiple predicted active power values ​​and target voltage values, a voltage control scheme is generated, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0037] In this step, a voltage control scheme can be generated based on the multiple active power prediction values ​​calculated the previous day and the target voltage value obtained at the target time on the current day. This scheme controls the reactive power of the target substation to maintain a balance and controls the high-voltage bus voltage of the target substation to maintain a relatively stable value, thereby ensuring the stable and safe operation of the power grid.

[0038] Through the above steps, the goal of flexibly adjusting the grid voltage during periods of large fluctuations in load active power or generator active power can be achieved. This realizes the technical effect of flexibly adjusting the grid voltage during periods of large fluctuations in load active power or generator active power, and solves the technical problem of the grid operating in an unsafe and unstable state due to the inability of traditional voltage control methods to quickly adjust the voltage to a reasonable range.

[0039] As an optional embodiment, obtaining multiple active power prediction values ​​of the target substation at multiple times can be achieved through the following steps: obtaining power data of each circuit in the power grid and the connection relationship of the power grid, wherein the target substation is located within the power grid; calculating the first active power sensitivity and the second active power sensitivity using a steady-state sensitivity analysis method based on the connection relationship and power data, wherein the first active power sensitivity is the active power sensitivity of multiple generators in the power grid to the target substation, and the second active power sensitivity is the active power sensitivity of multiple loads in the power grid to the target substation; obtaining the power prediction values ​​of multiple loads and the planned generation values ​​of multiple generators at multiple times; and determining the multiple active power prediction values ​​of the target substation based on the first active power sensitivity, the second active power sensitivity, the power prediction values, and the planned generation values.

[0040] Optionally, on the first day, multiple active power prediction values ​​of the target substation at multiple times during the second day should be obtained. These multiple active power prediction values ​​are calculated based on the operating status of the target substation on the first day. The calculation method can be as follows: obtain the voltage and current data on each circuit in the power grid, and obtain the connection relationship of the power grid connected to the target substation; based on the connection relationship of the power grid and the current and voltage data on the power grid, the first active power sensitivity of multiple generators in the power grid to the target substation can be calculated using the steady-state sensitivity analysis method, and the active power sensitivity of multiple loads in the power grid to the target substation can also be calculated; obtain the power prediction values ​​of multiple loads and the generation plan values ​​of multiple generators at multiple times during the second day, and combine the first active power sensitivity and the second active power sensitivity to obtain multiple active power prediction values ​​of the target substation at multiple times during the second day.

[0041] As an optional embodiment, the target time period can be determined based on multiple predicted active power values ​​corresponding to multiple times. This can be achieved through the following steps: determining multiple unit time periods based on multiple times, and calculating multiple rates of change of power of the target substation within each unit time period; determining the target time period based on the unit time period corresponding to the rate of change exceeding a first threshold among the multiple rates of change.

[0042] Optionally, after obtaining multiple active power prediction values ​​at various times within the second day, it is necessary to select the time periods in which the active power prediction values ​​of the target substation change significantly. The selection method can be as follows: First, determine multiple unit time periods based on the multiple times. For example, if 96 times are taken evenly on the second day, the interval between any two adjacent times can be determined to be 15 minutes, and each 15 minutes constitutes a unit time period. After determining multiple unit time periods, multiple rates of change of the target substation's power within each unit time period can be calculated. Then, the target time period is determined from one or more unit time periods where the rate of change of the target substation's power exceeds a first threshold.

[0043] As an optional embodiment, determining the target time period based on the unit time period corresponding to the rate of change exceeding a first threshold among multiple rates of change can be achieved through the following steps: Step 1: Determine whether the number of unit time periods in which the power change of the target substation exceeds a second threshold within the first unit time period and the first number of consecutive unit time periods after the first unit time period exceeds a second number, wherein the first unit time period is any one of the unit time periods corresponding to the rate of change exceeding the first threshold among multiple rates of change; Step 2: If the number of unit time periods in which the power change of the target substation exceeds the second threshold within the first unit time period and the first number of unit time periods after the first unit time period exceeds the second number, determine the first unit time period and the first number of unit time periods after the first unit time period as sub-target time periods; Step 1 to Step 2 are executed sequentially for each unit time period corresponding to the rate of change exceeding the first threshold among multiple rates of change to obtain multiple sub-target time periods, wherein the target time period includes multiple sub-target time periods.

[0044] Optionally, to determine the target time period among multiple unit time periods where the rate of change exceeds the first threshold, it can be first determined that if the number of unit time periods where the power change of the target substation exceeds the second threshold within the first unit time period and the first number of consecutive unit time periods after the first unit time period exceeds the second number, the first unit time period and the multiple consecutive unit time periods after the first unit time period are all recorded as sub-target time periods. Then, steps one and two provided in this optional embodiment are executed sequentially for each unit time period where the power change rate exceeds the first threshold, so that all sub-target time periods can be selected, and the set of all sub-target time periods is the target time period. Specifically, a day can be divided into 96 time periods, each lasting 15 minutes. Starting from 0:00, it can be determined whether the power change rate of the target substation exceeds a first threshold within the period from 0:00 to 0:15. If so, this period is recorded. This process is repeated for all 96 time periods to select those where the power change rate of the target substation exceeds the first threshold. The next step is to determine the target time period based on these time periods. Starting from 0:00 to 0:15, this period can be designated as the first unit time period, with a first quantity of 3. The calculation is performed on the first unit time period and the three unit time periods following it. That is, one hour from 0:00 to 1:00 is taken, which is four unit time periods. The calculation is performed to see if the power change of the target substation in each unit time period exceeds the second threshold. The second threshold can be 3. If the power change of the target substation exceeds the second threshold in three of the four unit time periods, then the four unit time periods from 0:00 to 1:00 are all recorded as sub-target time periods. The unit time periods in which the power change rate of each target substation exceeds the first threshold are calculated in turn, and finally multiple target time periods are selected.

[0045] As an optional embodiment, a voltage control scheme can be generated based on multiple active power prediction values ​​and target voltage values. This can be achieved through the following steps: at the target time, obtain the real-time voltage of the target substation; and generate a voltage control scheme based on the active power prediction value, real-time voltage, and target voltage value of the target substation within the target time period.

[0046] Optionally, at the target time on the second day, the real-time voltage of the target substation is acquired. Based on the previously acquired target voltage value of the target substation and the predicted active power value of the target substation within the target time period, a voltage control scheme can be generated. This mainly involves determining the difference between the real-time voltage and the target voltage value of the target substation, and combining this with the predicted active power value of the target substation from the previous day to make a comprehensive judgment and generate a voltage control scheme.

[0047] As an optional embodiment, a voltage control scheme is generated based on the predicted active power, real-time voltage, and target voltage value of the target substation within the target time period. This can be achieved through the following steps: determining the rise and fall state of the active load within the target time period based on the predicted active power of the target substation within the target time period; generating a first voltage control scheme when the active load is rising and the real-time voltage is less than the target voltage value within the target time period, wherein the voltage control scheme includes the first voltage control scheme; and generating a second voltage control scheme when the active load is falling and the real-time voltage is higher than the target voltage value within the target time period, wherein the voltage control scheme includes the second voltage control scheme.

[0048] Optionally, based on the predicted active power value within the target time period at the target time, it can be determined whether the target time period at the target time is in an increasing or decreasing state of active load at the target substation. When the target time is in an increasing active power state, if the real-time voltage of the target substation is higher than the target voltage value, no optimization strategy is needed, and the real-time voltage value does not need to be reduced through voltage control methods. However, if the real-time voltage of the target substation is lower than the optimized voltage, a first voltage control scheme needs to be generated, which may involve activating capacitive reactive power equipment or disconnecting inductive reactive power equipment to increase the real-time voltage of the target substation. When the target time is in a decreasing active power state, if the real-time voltage of the target substation is lower than the target voltage value, no optimization strategy is needed, and the real-time voltage value does not need to be increased through voltage control methods. However, if the real-time voltage of the target substation is higher than the optimized voltage, a second voltage control scheme needs to be generated, which may involve activating inductive reactive power equipment or disconnecting capacitive reactive power equipment to decrease the real-time voltage of the target substation.

[0049] As an optional embodiment, it can also be achieved through the following steps: obtaining a pre-set dead zone parameter, wherein the dead zone parameter characterizes the range of allowable real-time voltage fluctuations; determining that the real-time voltage is greater than the target voltage value when the real-time voltage is higher than the target voltage value and the absolute value of the difference is greater than the dead zone parameter; determining that the real-time voltage is less than the target voltage value when the real-time voltage is lower than the target voltage value and the absolute value of the difference is greater than the dead zone parameter.

[0050] Optionally, when judging whether the real-time voltage and the target voltage value are higher or lower, it is not simply a matter of comparing their magnitudes. Instead, voltage fluctuations are taken into account, and a fluctuation range is set for the voltage fluctuations, i.e., a dead zone parameter is set. The criterion for determining whether the bus voltage is lower than the optimized target value is:

[0051]

[0052] The criterion for determining that the bus voltage is higher than the optimization target value is:

[0053]

[0054] in, The voltage measurement value for bus i. The target value for optimizing the voltage of bus i is... The dead zone parameters for voltage optimization control of substation bus i are manually set, typically for 220kV substations. Optionally, a dead-time parameter can be set within the target time period. With a voltage of 1kV, it can achieve higher sensitivity during periods of significant active power fluctuations at the target substation, enabling rapid response and timely adjustment of the target voltage value to ensure reactive power balance at the target substation.

[0055] As a specific embodiment, the voltage control method for all substations on the power grid can be implemented through the following steps.

[0056] 1) Pre-set the time for daily calculation. Optionally, the daily calculation time can be after 4 or 5 pm, but it is generally set to 11:30 pm. Collect, extract and calculate the data of the day to calculate the predicted value of the active power of the power grid for the next day.

[0057] 2) When the daily time calculation time arrives, obtain the connection relationship and power flow of the power grid circuit, that is, the current and voltage data on the circuit. In the power grid model, n load sets are set; m generator sets are set; a main transformer high-voltage side winding sets are set; and b substation sets are set.

[0058] 3) Based on the power grid flow, the active power injection sensitivity of each load node and generator node in the region to the high-voltage winding of the main transformer in each substation is calculated using the quasi-steady-state sensitivity analysis method.

[0059] S ld-xf The active power sensitivity matrix of each load node to the high-voltage winding of the main transformer in each substation is as follows:

[0060]

[0061] Among them, S ij This represents the active power injection sensitivity of the i-th load node to the j-th main transformer high-voltage side winding.

[0062] S un-xf The sensitivity matrix for active power injection at generator nodes to the active power sensitivity of the high-voltage windings of the main transformers in each substation:

[0063]

[0064] Among them, S ij This represents the active sensitivity of the active power injection at the i-th generator node to the j-th main transformer high-voltage side winding. Since the physical effects of the load and generator on the power grid are opposite, the sensitivity of the generator node is opposite in sign to the sensitivity of the load node relative to the active power sensitivity to the main transformer high-voltage side winding.

[0065] 4) Read the load forecast data of each load and the power generation plan data of each generator for the entire day of the next day from the energy management system. The data time interval is 15 minutes, for a total of 96 time points.

[0066] Let P be a matrix representing the load forecast data for n loads at 96 time points. ld :

[0067]

[0068] in, This represents the predicted load value for the i-th load at time j.

[0069] Let P be a matrix representing the load forecast data for m generators at 96 time points. un :

[0070]

[0071] in, This represents the planned power generation value of the i-th generator at time j;

[0072] 5) Based on the results of step 3) and step 4), the predicted active power P of the high-voltage side windings of the a main transformers on the second day can be calculated. xf ,

[0073]

[0074] The calculation yields:

[0075]

[0076] in, This represents the predicted active power of the i-th main transformer high-voltage side winding at time j.

[0077] 6) Each main transformer's high-voltage side winding corresponds to one main transformer. Based on the connection relationship in the power grid model, the substation to which each main transformer belongs can be determined. By adding the predicted active power values ​​of all main transformers belonging to the same substation at the same time, the active power value of that substation can be obtained, forming the total active power of b substations throughout the day, i.e., P. st :

[0078]

[0079] in, This represents the predicted active power value of the i-th substation at time j.

[0080] 7) Set i=1, and start the calculation and judgment from the i-th substation;

[0081] 7-1) From the active power set of the i-th substation at 96 times throughout the day, we can obtain the two extreme values ​​of the active power at those 96 times. The maximum value is... and minimum value The maximum peak-to-valley difference of active power of substation i throughout the day was calculated.

[0082] 7-2) Set an absolute numerical threshold value. if Then proceed to the next step of judgment; if Then i = i + 1, determine the next substation, and recalculate from step 7-1);

[0083] 7-3) Set a threshold value for the rate of change. Maximum rate of change if Then proceed to the next step of judgment; if Then i = i + 1, determine the next substation, and recalculate from step 7-1);

[0084] 7-4) Set a threshold value for the rate of change of data between two adjacent time points. And set x = 0, and start judging from the x-th time;

[0085] 7-5) Calculate the trend of active power transmission at substation i over a period of T minutes starting from time x. Each time period is 15 minutes. The future time T minutes can be determined by the time interval t = T / 15. Set the initial value of the variable L. I =0,L D =0,L I To determine the counter for the time (segment) of the active power trend increase, L D To determine the counter for the time (segment) of active power trend decline, the following steps are executed sequentially:

[0086] 7-5-1) Obtain active power trend prediction data for future time periods of substation i. This represents the active power prediction data for substation i at time x+y. For substation i in The active power prediction data for the next moment, ΔP y The difference in predicted active power between two adjacent time points is calculated with y=0 as the initial value:

[0087]

[0088] 7-5-2) Check the calculation result,

[0089] If ΔP y ≥0 and satisfies ΔP y > P1, then L I = L I + 1;

[0090] If ΔP y <0 and satisfies ΔP y < P2, then L D = L D + 1;

[0091] P1 and P2 are the threshold parameters for determining the increase and decrease change rates of the substation load respectively, unit: MW / minute. They can be set according to the daily experience of the substation load change;

[0092] 7-5-3) If y < t, then update y = y + 1 and continue to return to step 7-5-1);

[0093] 7-5-4) If L I > L1, it is considered that the active power transmission of the substation enters the rising period, and the T-minute period after the x-th moment is determined as the period for preferentially putting into capacitive reactive power equipment or preferentially cutting off inductive reactive power equipment, and this period is added to the period set;

[0094] 7-5-5) If L D > L2, it is considered that the active power transmission of the substation enters the falling period, and the T-minute period after the x-th moment is determined as the period for preferentially putting into inductive reactive power equipment or preferentially cutting off capacitive reactive power equipment, and this period is added to the period set;

[0095] 7-6) Let x = x + 1. If x ≤ 96, return to step 7-5); If x > 96, go to the next step.

[0096] 7-7) Let i = i + 1. If i ≤ b, return to step 7-1); If i > b, the preferential action periods of the capacitor reactors of all substations have been calculated and can be applied in the real-time automatic voltage control stage of the next day.

[0097] 8) Set the automatic voltage control period as T c , and in practice, automatic voltage control is generally carried out once every 5 minutes;

[0098] 9) When each automatic voltage control period arrives, set i = 0. When judging substation i, the following steps are required:

[0099] 9-1) If any bus voltage of substation i exceeds the limit, that is, determine whether the real-time voltage is greater than or less than the target voltage value, let i = i + 1, and continue to make judgments; if no limit is exceeded, proceed to the next step.

[0100] 9-2) If the current moment falls within the priority action period calculated in step 7-7), then an optimization strategy for prioritizing discrete actions needs to be generated, and the following steps need to be performed:

[0101] 9-2-1) The current time belongs to the set (i.e., during the active load rise period of the substation). If the real-time voltage of the high-voltage side bus of substation i is higher than the optimized voltage, no optimization strategy is needed; if it is lower than the optimized voltage, an optimization strategy is generated for the substation to put on capacitive reactive power equipment or cut off inductive reactive power equipment.

[0102] 9-2-2) The current time belongs to the set (i.e., during the active load decline period of the substation). If the real-time voltage of the high-voltage side bus of substation i is lower than the optimized voltage, no optimization strategy is needed; if it is higher than the optimized voltage, an optimization strategy is generated for the substation to put inductive reactive power equipment into operation or cut off capacitive reactive power equipment.

[0103] 9-3) Let i = i + 1. If i <= b, proceed to step 9-1) for judgment; if i > b, it means that the calculation of all substation automatic voltage control strategies in this round is complete. When the next automatic voltage control cycle arrives, return to step 9) to start a new round of real-time automatic voltage control calculation.

[0104] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0105] Through the above description of the embodiments, those skilled in the art can clearly understand that the automatic voltage control method according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0106] According to an embodiment of the present invention, an apparatus for implementing the above-described automatic voltage control method is also provided. Figure 3 This is a structural block diagram of an automatic voltage control device provided according to an embodiment of the present invention, such as... Figure 3 As shown, the automatic voltage control device includes: a first acquisition module 32, a determination module 34, a second acquisition module 36, and a generation module 38. The automatic voltage control device will be described below.

[0107] The first acquisition module 32 is used to acquire multiple active power prediction values ​​of the target substation at multiple times.

[0108] The determination module 34 is connected to the first acquisition module 32 and is used to determine the target time period based on multiple active power prediction values.

[0109] The second acquisition module 36, connected to the determination module 34, is used to acquire the target voltage value of the target substation at the target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation.

[0110] The generation module 38, connected to the second acquisition module 36, is used to generate a voltage control scheme based on multiple active power prediction values ​​and target voltage values. The voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0111] It should be noted that the first acquisition module 32, the determining module 34, the second acquisition module 36, and the generating module 38 mentioned above correspond to steps S202 to S208 in the embodiments. Multiple modules and their corresponding steps implement the same instances and application scenarios, but are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of the device, can run on the computer terminal 10 provided in the embodiments.

[0112] Embodiments of the present invention may provide a computer device. Optionally, in this embodiment, the computer device may be located in at least one of a plurality of network devices in a computer network. The computer device includes a memory and a processor.

[0113] The memory can be used to store software programs and modules, such as the program instructions / modules corresponding to the automatic voltage control method and device in this embodiment of the invention. The processor executes various functional applications and data processing by running the software programs and modules stored in the memory, thereby realizing the aforementioned automatic voltage control method. The memory may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to a computer terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0114] The processor can access the information and application program stored in the memory via the transmission device to perform the following steps: acquiring multiple active power prediction values ​​of the target substation at multiple times; determining the target time period based on the multiple active power prediction values; acquiring the target voltage value of the target substation at the target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage bus voltage of the target substation; and generating a voltage control scheme based on the multiple active power prediction values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0115] This invention provides an automatic voltage control scheme. It involves acquiring multiple predicted active power values ​​of a target substation at various times; determining a target time period based on these predicted values; acquiring a target voltage value at a target time, where the target time falls within the target time period and the target voltage value represents the high-voltage bus voltage of the target substation; and generating a voltage control scheme based on the predicted active power values ​​and the target voltage value. This scheme aims to maintain a balance in the reactive power of the target substation, achieving flexible adjustment of the grid voltage during periods of large fluctuations in load active power or generator active power. This solves the technical problem of the grid operating in an unsafe and unstable state due to the inability of traditional voltage control methods to quickly adjust the voltage to a reasonable range.

[0116] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a non-volatile storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc.

[0117] Embodiments of the present invention also provide a non-volatile storage medium. Optionally, in this embodiment, the aforementioned non-volatile storage medium can be used to store the program code executed by the automatic voltage control method provided in the above embodiments.

[0118] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0119] Optionally, in this embodiment, the non-volatile storage medium is configured to store program code for performing the following steps: obtaining multiple active power prediction values ​​of the target substation at multiple times; determining a target time period based on the multiple active power prediction values; obtaining a target voltage value of the target substation at a target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation; generating a voltage control scheme based on the multiple active power prediction values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance.

[0120] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0121] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0122] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0123] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0125] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a non-volatile storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the 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, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0126] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic voltage control method, characterized in that, include: Obtain multiple predicted active power values ​​of the target substation at multiple times; Based on the multiple predicted active power values, the target time period is determined; Obtain the target voltage value of the target substation at a target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation; A voltage control scheme is generated based on the multiple predicted active power values ​​and the target voltage value, wherein the voltage control scheme is used to maintain the reactive power balance of the target substation; wherein the predicted active power values ​​are calculated based on the following method: in, The predicted active power value is... These are the predicted power values ​​of multiple loads in the power grid where the target substation is located at the multiple time points. This is the active power sensitivity matrix of multiple loads in the power grid to the target substation. P is the active power sensitivity matrix of multiple generators in the power grid to the target substation. un The load prediction data for the multiple generators at the multiple times; The step of determining the target time period based on the multiple active power prediction values ​​corresponding to the multiple times includes: determining multiple unit time periods based on the multiple times, and calculating multiple change rates of the power of the target substation within the multiple unit time periods; Step 1: determining whether the number of unit time periods in which the power change of the target substation exceeds a second threshold within a first unit time period and a first number of consecutive unit time periods after the first unit time period exceeds a second number, wherein the first unit time period is any one of the unit time periods corresponding to the change rate exceeding the first threshold among the multiple change rates; Step 2: if the number of unit time periods in which the power change of the target substation exceeds the second threshold within the first unit time period and the first number of unit time periods after the first unit time period exceeds the second number, determining the first unit time period and the first number of unit time periods after the first unit time period as sub-target time periods; sequentially performing Step 1 to Step 2 on each unit time period in the unit time periods corresponding to the change rate exceeding the first threshold among the multiple change rates to obtain multiple sub-target time periods, wherein the target time period includes the multiple sub-target time periods.

2. The method according to claim 1, characterized in that, The acquisition of multiple active power prediction values ​​of the target substation at multiple times includes: Acquire power data for each circuit in the power grid and the connection relationship of the power grid, wherein the target substation is located within the power grid; Based on the connection relationship and the power data, the first active power sensitivity and the second active power sensitivity are calculated using the steady-state sensitivity analysis method. The first active power sensitivity is the active power sensitivity of multiple generators in the power grid to the target substation, and the second active power sensitivity is the active power sensitivity of multiple loads in the power grid to the target substation. Obtain the power forecast values ​​of the multiple loads and the power generation plan values ​​of the multiple generators at the multiple times; Based on the first active power sensitivity, the second active power sensitivity, the predicted power value, and the planned power generation value, the multiple predicted active power values ​​of the target substation are determined.

3. The method according to claim 1, characterized in that, The step of generating a voltage control scheme based on the multiple predicted active power values ​​and the target voltage value includes: At the target time, acquire the real-time voltage of the target substation; The voltage control scheme is generated based on the predicted active power of the target substation within the target time period, the real-time voltage, and the target voltage value.

4. The method according to claim 3, characterized in that, The step of generating the voltage control scheme based on the predicted active power of the target substation within the target time period, the real-time voltage, and the target voltage value includes: Based on the predicted active power of the target substation within the target time period, determine the rise and fall status of active load in the target time period at which the target moment is located. If the active load is in an increasing state during the target time period at the target time, and the real-time voltage is less than the target voltage value, a first voltage control scheme is generated, wherein the voltage control scheme includes the first voltage control scheme. If the active load is decreasing during the target time period at the target time and the real-time voltage is higher than the target voltage value, a second voltage control scheme is generated, wherein the voltage control scheme includes the second voltage control scheme.

5. The method according to claim 4, characterized in that, Also includes: Obtain a pre-set dead zone parameter, wherein the dead zone parameter characterizes the range of allowable real-time voltage fluctuations; If the real-time voltage is higher than the target voltage value and the absolute value of the difference is greater than the dead zone parameter, then the real-time voltage is determined to be higher than the target voltage value. If the real-time voltage is lower than the target voltage value and the absolute value of the difference is greater than the dead zone parameter, then the real-time voltage is determined to be less than the target voltage value.

6. An automatic voltage control device, characterized in that, include: The first acquisition module is used to acquire multiple active power prediction values ​​of the target substation at multiple times. The determination module is used to determine the target time period based on the multiple active power prediction values; The second acquisition module is used to acquire the target voltage value of the target substation at a target time, wherein the target time is within the target time period, and the target voltage value represents the high-voltage side bus voltage of the target substation. The generation module is used to generate a voltage control scheme based on the multiple predicted active power values ​​and the target voltage value, wherein the voltage control scheme is used to control the reactive power of the target substation to maintain balance; The predicted active power value is calculated based on the following method: in, The predicted active power value is... These are the predicted power values ​​of multiple loads in the power grid where the target substation is located at the multiple time points. This is the active power sensitivity matrix of multiple loads in the power grid to the target substation. This is the active power sensitivity matrix of multiple generators in the power grid to the target substation. The load prediction data for the multiple generators at the multiple times; The determining module is further configured to determine multiple unit time periods based on the multiple times, and calculate multiple change rates of the power of the target substation within the multiple unit time periods respectively; Step 1: Determine whether the number of unit time periods in which the power change of the target substation exceeds a second threshold within a first unit time period and a first number of consecutive unit time periods after the first unit time period exceeds a second number, wherein the first unit time period is any one of the unit time periods corresponding to the change rate exceeding the first threshold among the multiple change rates; Step 2: If the number of unit time periods in which the power change of the target substation exceeds the second threshold within the first unit time period and the first number of unit time periods after the first unit time period exceeds the second number, determine the first unit time period and the first number of unit time periods after the first unit time period as sub-target time periods; Step 1 to Step 2 are executed sequentially for each unit time period corresponding to the change rate exceeding the first threshold among the multiple change rates to obtain multiple sub-target time periods, wherein the target time period includes the multiple sub-target time periods.

7. A non-volatile storage medium, characterized in that, The non-volatile storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the non-volatile storage medium to perform the automatic voltage control method according to any one of claims 1 to 5.

8. A computer device, characterized in that, include: Memory and processor The memory stores computer programs; The processor is configured to execute a computer program stored in the memory, wherein when the computer program is executed, the processor performs the automatic voltage control method according to any one of claims 1 to 5.

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