Experimental study on adaptive hysteresis current controller for inverter-interfaced 1-Φ grid connected system

In the present scenario distributed generation (DG) system uses current regulated PWM voltage-source inverters (VSI) for synchronizing the utility grid with DG source in order to meet the following objectives: 1) ensure grid stability 2) active and reactive power control through voltage and frequency control 3) power quality improvement (i.e. harmonic elimination) etc. In this paper the comparative study between adaptive hysteresis and hysteresis current controller is presented for 1-Φ grid connected inverter system. The main advantages of adaptive hysteresis current controller are constant switching frequency of operation, better dc-bus voltage utilization, simple filter design and low total harmonic distortion (THD) at the point of common coupling (PCC). The studied system is modeled and simulated in the MATLAB-Simulink environment. Further, an experimental work has been carried out in the laboratory set-up in the discrete-domain via TMS320F2812 digital signal processor (DSP) and we could find there is an effective validation with simulated results.