Design for reactive power compensator based on

improved BuckBoost AC/AC chopper

 

MA Lixin, MA Tianshun

(Department of Electrical Engineering School of OpticalElectrical and Computer Engineering,

University of Shanghai for Science &Technology, Shanghai 200093, China)

 

Abstract: Aiming at the problem of voltage reduction and voltage distortion due to the extensive use of inductive loads, and some shortcomings of existing reactive power compensation devices, a new AC—AC chopper based var compensator was proposed. The basic principles, compensation characteristics and topology of the improved BuckBoost AC—AC chopper based var compensator were described, the mathematical model of improved BuckBoost based on statespace equation was established, the relationship between duty ratio and compensation current was derived. The instantaneous reactive power theory and direct current control method were adopted to build a Matlab model. The results indicate that the realtime compensation of reactive power in grid side can be realized by this var compensator based on a direct controlled BuckBoost AC—AC chopper, it has potentiouy pratical value.

Key words: improved buckboost circuit; reactive power compensation; control strategy; Matlab/Simulink; cascaded model