Study on Output Filter in Parallel Active Power Filter

This paper presents the results of study on output filter in parallel active power filter.According to requirement of instant current tracking,the estimating formula of output filter is proposed.And then,the method applied to design parametes of LRC output filter is introduced in detail.The simulation and experiment result of rectifier load compensation performances has verified that the proposed design method is feasible.Parameter of LRC output filter selected by this method is suitable for APF which has good compensation performances.After compensation,THD is low and high frequency component is eliminated effectively.