Digital Implementation of Reference Current Generation Schemes for Current Error Space Phasor Hysteresis Controller based Shunt Active Power Filters

Abstract

Power quality improvement devices like Shunt Active Power Filters (SAPF) are commonly employed to reduce harmonics introduced by Non-linear loads. Performance of SAPF using current error space phasor based hysteresis controller is presented in this paper to prove controller’s versatile nature. Dynamic behavior of the SAPF is demonstrated for changes in load. Comparative study for Digital Signal Processor (DSP) based implementation of Instantaneous Reactive Power Theory (IRP) and Fryze current computation method for generation of reference compensating currents is presented in this paper. Experimental results for different strategies of reference compensating currents generated using DSP TMS320LF2407A are demonstrated in the present work. The controller switches voltage vectors adjacent to the voltage vector at the point of common coupling and hence keeps the current error within desired hexagonal boundary during steady state as well as transient operating conditions. The effectiveness of the proposed controller is demonstrated by simulation studies