Compensation of Unbalanced Non Linear Load and neutral currents using stationary Reference Frame in Shunt Active Filters

Abstract

Inasmuch as there are many single phase unbalanced linear and non linear loads in distribution system, current flows through null wire. Because of voltage drops of null wire, load voltage will be unbalance. Different methods have been presented for compensation of load current compensation, which shunt active filter is one of them. Shunt active filter is effective on source current, and it can compensate reactive and non sinusoidal currents. If voltage is unbalanced because of unbalanced current, shunt active filter can compensate harmonics, zero and negative sequences of current and the result of compensation is balanced voltage. Is network cause of voltage unbalancing, shunt active filter won't efficient. This paper has presented a Compensation of Unbalanced Non Linear Load Currents and Null Current by Use of Stationary Reference Frame in Shunt Active Filter in order to compensation of harmonics, zero and negative sequences of current. Not only presented control method can compensate harmonic and unbalanced currents, but also it can compensate reactive current, and power factor will be near to unity. To confirm it, shunt active filter has been simulated by PSIM, and the resultants demonstrate efficiency of presented method on compensation of non linear load current, null current and power factor improvement.