Time-varying value-limiting reactive power optimization control method of district power grid on basis of load fluctuation rule

Abstract

The invention relates to a time-varying value-limiting reactive power optimization control method of a district power grid on the basis of a load fluctuation rule. The time-varying value-limiting reactive power optimization control method comprises the following steps of: (1) solving optimal values QO and UO of each node of the power grid as central reference values of reactive power and voltage limit values of a reactive power compensation controller of each node by adopting an optimal power flow (OPF) algorithm; (2) solving a multi-fractal parameter of a power load time sequence of each compensating point by using a fractal theory and a method of statistical physics, and solving a multi-fractal parameter Delta Alpha T of 24 hours of one day finally, wherein T ranges from 0 to 23; (3) determining a compensation time intervals of the power grid by adopting a clustering algorithm; and (4) at each compensating point, determining upper and lower limit ranges of voltage and reactive power of each time interval according to the load fluctuation degree of the compensating point. The time-varying value-limiting reactive power optimization control method takes the fluctuation condition of the load within one day into consideration and can ensure that actions of a transformer and a capacitor happen in the time interval when the power grid needs to be subjected to reactive power compensation, thereby improving the compensation effect of the power grid, reducing the action frequency of compensation equipment and prolonging the service life of the equipment.

Description

technical field [0001] The invention relates to a reactive power optimization control method of a time-varying limit value regional power grid based on the law of load fluctuation. Background technique [0002] The problem of voltage and reactive power compensation control has always been a traditional topic in power system operation control. Generally, voltage and reactive power control is realized by adjusting the transformer gear and switching capacitors. There are two methods: local compensation and regional power grid optimization control. Among them, most of the in-situ compensation methods use voltage and reactive power compensation devices (VQC) to realize automatic control. Common control criteria include 9-area diagram. Because the data collection scope of VQC is limited to the voltage and reactive power variables in the substation, it is impossible to realize the coordinated optimization of the entire regional power grid. In addition, because the fluctuation law ...

AI Technical Summary

Problems solved by technology

Its problems are: 1) The choice of optimization time point

Since the power grid load is constantly changing, with both randomness and regularity, if the optimization time point is set to a fixed value, it is very likely that the system will not work at the time when optimization is most needed on a certain day. However, the system works at other times, thus reducing the use effect of the regional power grid optimization cont

Images