Design for reactive power compensator based on improved Buck-Boost AC/AC chopper.

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 topolog of the improved Buck-Boost AC--AC chopper based var compensator were described, the mathe-matical 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 potential application value. [ABSTRACT FROM AUTHOR]