Reactive compensation control system and reactive compensation control method based on fuzzy control

Abstract

The invention discloses a reactive compensation control system and a reactive compensation control method based on fuzzy control. The reactive compensation control system comprises a fuzzification interface unit, a fuzzy inference machine unit and a defuzzification interface unit. The fuzzification interface unit obtains a fuzzy set and a membership degree table of voltage deviations and power factor deviations. The fuzzy inference machine unit obtains a fuzzy control regulation table and obtains a fuzzy relationship R between a fuzzy control relationship matrix A of the voltage deviation eu and a fuzzy control relationship matrix B of the power factor deviation ephi. The reactive compensation method comprises an initializing step, a capacitance inputting control step and a capacitance eliminating control step. A power factor is calculated and compared with a preset value. When the power factor is lower than the preset value, the fuzzy control module performs the capacitance inputting control step; and when the power factor is higher than the preset value, the fuzzy control module performs an electric eliminating control step. The reactive compensation control system and the reactive compensation control method have advantages of controlling a reactive power absorbed from the power grid side by a load within a certain range, and furthermore preventing oscillation caused by repeated switching of a capacitor set.

Description

technical field [0001] The invention relates to a power quality comprehensive controller and a control method, in particular to a reactive power compensation control system and method based on fuzzy control. Background technique [0002] In the power system, there are reactive loads from power lines, power transformers and user equipment. The large amount of reactive power in the system will reduce the power factor of the system, increase the loss of line voltage and power loss, and seriously affect the economy of power companies. benefit. When the reactive power of the system is insufficient, the voltage level of the system will drop significantly, and the excessive reactive power will cause the voltage to be high. In order to maintain the load terminal voltage, the system reactive power compensation must be increased, otherwise the system voltage will drop to a limit point, and the system will be difficult to maintain stability. The line loss rate is an important technic...

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Problems solved by technology

In this adjustment process, excessive capacitor bank switching inrush currents are likely to occur frequently, and even capacitor switching oscillations may occur, which reduces the service life of the capacitor bank

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