Incremental recursive solution method for capacitor switching bus voltage

Abstract

The invention discloses a capacitor switching bus voltage increment recursive resolving method, which utilizes mth capacitor switching on / off information, and adopts a recursive formula for calculating voltage increment, which is calculated according to the formula shown in the description, of a bus BUSN connected with a capacitor when an m+1th reactive out-of-limit event occurs. In the formula, Um1 represents a voltage of the bus BUSN after the mth capacitor switching on / off, Um0 represents a voltage of the bus BUSN before the mth capacitor switching on / off, Q[N (m+1)] represents a rated capacity of a capacitor to be controlled remotely which is decided by the m+1th reactive out-of-limit event preliminarily, Q[Nm] represents a rated capacity of an action capacitor in mth reactive out-of-limit event, and U (m+1)0 represents a voltage of the bus BUSN in the m+1th reactive out-of-limit event. The capacitor switching bus voltage increment recursive resolving method utilizes structure parameters of the power grid and real-time information during the operating process of the power grid, reflects the influence of the variables on bus voltage increment more accurately, reduces the dependence on entire grid measurement accuracy and entire grid state estimation qualified rate since all calculation variables are measured locally within a transformer substation, reduces calculation cost, and improves real-time performance of AVC control.

Description

technical field [0001] The invention relates to a method for recursively solving the voltage increment of a capacitor switching bus, belonging to the technical field of power system operation and control. Background technique [0002] In the automatic voltage control system (hereinafter referred to as the AVC system), the capacitor is the main device for adjusting reactive power and voltage. The principle of switching / cutting capacitors is that the reactive power and the connected bus voltage will not exceed the limit after the capacitor is activated. Therefore, for each capacitor switching / cutting of the capacitor, the AVC system needs to make a series of pre-judgments, including judging the capacitor’s action. After that, check whether the reactive power of the station / gate to which the capacitor belongs and the voltage of the connected bus are within the normal limits. [0003] Determining whether the bus voltage exceeds the limit after the capacitor operates can be attr...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for recursively solving the incremental voltage of the busbar voltage after capacitor switching / cutting, and solve the problem of the calculation accuracy of the incremental calculation method of the busbar voltage after capacitor switching / cutting in the prior art. high and usability issues

Images