CN-115663836-B - Automatic voltage control method, device and non-volatile storage medium

CN115663836BCN 115663836 BCN115663836 BCN 115663836BCN-115663836-B

Abstract

The invention discloses an automatic voltage control method, an automatic voltage control device and a nonvolatile storage medium. The method comprises the steps of obtaining a plurality of active power predicted values of a target transformer substation at a plurality of moments respectively, determining a target time period according to the plurality of active power predicted values, obtaining a target voltage value of the target transformer substation at the target moment, wherein the target moment is located in the target time period, the target voltage value represents high-voltage side bus voltage of the target transformer substation, and generating a voltage control scheme according to the plurality of active power predicted values and the target voltage value, wherein the voltage control scheme is used for controlling reactive power of the target transformer substation to keep balanced. The invention solves the technical problem that the power grid operates in an unsafe and stable state because the traditional voltage control method can not quickly adjust the voltage to a reasonable interval.

Inventors

WANG HAIYUN
ZHANG YUXUAN
YANG LIPING
WANG WEI
WANG WEI
YU XIJUAN
ZHOU YUNBIN
SHI ENJIE
WANG LEI
ZHANG ZAICHI
DONG NAN
CHEN QIAN

Assignees

国网北京市电力公司
国家电网有限公司
北京清大高科系统控制有限公司

Dates

Publication Date: 20260508
Application Date: 20221021

Claims (8)

1. An automatic voltage control method, comprising: Acquiring a plurality of active power predicted values of a target transformer substation at a plurality of moments respectively; determining a target time period according to the active power predicted values; acquiring a target voltage value of the target transformer substation at a target time, wherein the target time is positioned in the target time period, and the target voltage value represents the high-voltage side bus voltage of the target transformer substation; generating a voltage control scheme according to the active power predicted values and the target voltage value, wherein the voltage control scheme is used for controlling reactive power of the target transformer substation to keep balanced, and the active power predicted values are calculated based on the following modes: Wherein, the As a result of the predicted value of the active power, For the predicted values of the power of the loads in the power grid where the target substation is located at the plurality of moments, An active sensitivity matrix for a plurality of loads in the grid to the target substation, For an active sensitivity matrix of a plurality of generators in the power grid to the target substation, P un is load prediction data of the plurality of generators at a plurality of moments; The method comprises the steps of determining a plurality of unit time periods according to a plurality of active power predicted values corresponding to the plurality of moments, and calculating a plurality of change rates of power of a target transformer substation in the plurality of unit time periods respectively, judging whether the number of the unit time periods of which the power change amount of the target transformer substation exceeds a second threshold exceeds a second number in a first unit time period and a continuous first number of unit time periods after the first unit time period, wherein the first unit time period is any one of the unit time periods corresponding to the change rate exceeding a first threshold in the plurality of change rates, and determining whether the number of the unit time periods of the target transformer substation exceeds the second number in the first unit time period and the first number of unit time periods after the first unit time period, wherein the number of the unit time periods exceeds the second threshold in the first unit time period, and determining the number of unit time periods to be the target transformer substation in sequence, and determining the number of sub-time periods to be changed in the first unit time period after the first unit time period.
2. The method of claim 1, wherein the obtaining a plurality of active power predictors for the target substation at a plurality of times, respectively, comprises: acquiring the connection relation between the power data of each circuit in a power grid and the power grid, wherein the target transformer substation is positioned in the power grid; according to the connection relation and the power data, calculating to obtain a first active sensitivity and a second active sensitivity by adopting a steady state sensitivity analysis method, wherein the first active sensitivity is the active sensitivity of a plurality of generators in the power grid to the target transformer substation, and the second active sensitivity is the active sensitivity of a plurality of loads in the power grid to the target transformer substation; Acquiring power predicted values of the plurality of loads and power generation planned values of the plurality of generators at the plurality of moments; and determining the plurality of active power predicted values of the target transformer substation according to the first active sensitivity, the second active sensitivity, the power predicted value and the power generation plan value.
3. The method of claim 1, wherein generating a voltage control scheme from the plurality of active power predictions and the target voltage value comprises: acquiring real-time voltage of the target transformer substation at the target moment; And generating the voltage control scheme according to the active power predicted value, the real-time voltage and the target voltage value of the target transformer substation in the target time period.
4. The method of claim 3, wherein the generating the voltage control scheme from the active power forecast value, the real-time voltage, and the target voltage value for the target substation for the target period of time comprises: according to the active power predicted value of the target transformer substation in the target time period, determining the lifting state of the active load in the target time period where the target moment is located; Generating a first voltage control scheme when the active load is in a rising state in a target time period where the target moment is located and the real-time voltage is smaller than the target voltage value, wherein the voltage control scheme comprises the first voltage control scheme; And generating a second voltage control scheme under the condition that the active load is in a falling state within a target time period where the target moment is located and the real-time voltage is higher than the target voltage value, wherein the voltage control scheme comprises the second voltage control scheme.
5. The method as recited in claim 4, further comprising: Obtaining a preset dead zone parameter, wherein the dead zone parameter represents a range allowing the real-time voltage fluctuation; determining that the real-time voltage is greater than the target voltage value if the real-time voltage is greater than the target voltage value and an absolute value of a difference is greater than the dead zone parameter; And determining that the real-time voltage is smaller than the target voltage value in the case that the real-time voltage is lower than the target voltage value and the absolute value of the difference is larger than the dead zone parameter.
6. An automatic voltage control apparatus, comprising: the first acquisition module is used for acquiring a plurality of active power predicted values of the target transformer substation at a plurality of moments respectively; the determining module is used for determining a target time period according to the active power predicted values; The second acquisition module is used for acquiring a target voltage value of the target transformer substation at a target time, wherein the target time is positioned in the target time period, and the target voltage value represents the high-voltage side bus voltage of the target transformer substation; The generation module is used for generating a voltage control scheme according to the active power predicted values and the target voltage value, wherein the voltage control scheme is used for controlling reactive power of the target transformer substation to keep balanced; the active power predicted value is calculated based on the following mode: Wherein, the As a result of the predicted value of the active power, For the predicted values of the power of the loads in the power grid where the target substation is located at the plurality of moments, An active sensitivity matrix for a plurality of loads in the grid to the target substation, For an active sensitivity matrix of a plurality of generators in the grid to the target substation, Predicting data for loads of the plurality of generators at the plurality of times; The determining module is further configured to determine a plurality of unit time periods according to the plurality of moments, and calculate a plurality of change rates of the power of the target substation in the plurality of unit time periods respectively, in the first step, determine whether the number of unit time periods in which the power change amount of the target substation exceeds a second threshold exceeds a second number in a first number of consecutive unit time periods in which the power change amount of the target substation exceeds the second threshold, wherein the first unit time period is any one of the unit time periods corresponding to the change rate exceeding the first threshold in the plurality of change rates, in the second step, in which the number of unit time periods in which the power change amount of the target substation exceeds the second threshold exceeds the second number in the first number of unit time periods in which the power change amount of the target substation exceeds the first threshold in the first unit time period, and in the first number of unit time periods in which the power change amount of the target substation exceeds the second threshold exceeds the second number in the first number of unit time periods, and in turn determine that the first number of unit time periods exceeds the first number of unit time periods in the first number of unit time periods, wherein the target time periods in which the power change amount of the target substation exceeds the first number of unit time periods in the first number of unit time periods is performed.
7. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored program, wherein the program, when run, controls a device in which the non-volatile storage medium is located to perform the automatic voltage control method according to any one of claims 1 to 5.
8. A computer device is characterized by comprising a memory and a processor, The memory stores a computer program; The processor being configured to execute a computer program stored in the memory, the computer program when run causing the processor to perform the automatic voltage control method of any one of claims 1 to 5.

Description

Automatic voltage control method, device and non-volatile storage medium Technical Field The invention relates to the technical field of power grid regulation, in particular to an automatic voltage control method, an automatic voltage control device and a nonvolatile storage medium. Background An automatic voltage control (AVC, automatic Voltage Control) system is an important means for realizing safe (voltage stability margin improvement), economical (network loss reduction) and high-quality (voltage qualification rate improvement) operation of a power transmission network. The AVC system is constructed on a power grid Energy Management System (EMS), can utilize real-time operation data of a power grid, scientifically decides an optimal reactive voltage adjustment scheme from the perspective of global optimization of the power grid, and automatically distributes the optimal reactive voltage adjustment scheme to a power plant, a transformer substation and a lower power grid dispatching mechanism for execution. New energy has become the preferred scheme of the clean energy replacement of the regional propulsion of the lack of conditions, formed new energy and gathered the district, its grid-connected capacity increases fast, bring new challenges for the dispatch operation of electric wire netting. On one hand, in some areas close to a load center, such as offshore areas in coastal developed cities, and with wind throughout the year, the system is very suitable for the active demands of electric load centers, on the other hand, a large-scale centralized development mode is adopted, the reactive voltage support of conventional water and fire power plant units is lacking in the area where new energy is centralized and connected, the short circuit capacity of the system is smaller, the inherent active power generation intermittent change of the new energy can cause larger voltage fluctuation, and the voltage regulation and control are more difficult. In an electric power system, particularly in a region with a larger installed capacity of new energy, the change of active power can generate larger and quicker change, so that the fluctuation of the power grid voltage can be larger. The traditional AVC control method simply generates a control strategy of reactive equipment according to the reactive voltage condition at a single moment, at the moment of large power grid load change, the voltage cannot be quickly regulated to a reasonable interval at first, repeated switching of the reactive equipment can be caused, economic loss is caused due to less service life of the equipment, and the condition of large fluctuation of the voltage change can be caused, so that the safe and stable operation of the power grid is influenced. In view of the above problems, no effective solution has been proposed at present. Disclosure of Invention The embodiment of the invention provides an automatic voltage control method, an automatic voltage control device and a nonvolatile storage medium, which at least solve the technical problem that a power grid runs in an unsafe and stable state because the traditional voltage control method can not quickly adjust the voltage to a reasonable interval. According to one aspect of the embodiment of the invention, an automatic voltage control method is provided, and the automatic voltage control method comprises the steps of obtaining a plurality of active power predicted values of a target transformer substation at a plurality of moments respectively, determining a target time period according to the plurality of active power predicted values, obtaining a target voltage value of the target transformer substation at the target moment, wherein the target moment is located in the target time period, the target voltage value represents high-voltage side bus voltage of the target transformer substation, and generating a voltage control scheme according to the plurality of active power predicted values and the target voltage value, wherein the voltage control scheme is used for controlling reactive power of the target transformer substation to keep balanced. The method comprises the steps of obtaining connection relation between power data of each circuit in a power grid and the power grid, obtaining first active sensitivity and second active sensitivity by adopting a steady-state sensitivity analysis method according to the connection relation and the current-voltage data, wherein the first active sensitivity is active sensitivity of a plurality of generators in the power grid to the target transformer substation, the second active sensitivity is active sensitivity of a plurality of loads in the power grid to the target transformer substation, obtaining power prediction values of the plurality of loads at a plurality of times and power generation plan values of the plurality of generators, and determining a plurality of active power prediction values of the target transformer substation according to