Voltage improvement and harmonic compensation in stand-alone inverter-based distributed generation using RS-HNSPWM

This paper presents a control scheme based on random switching hybrid nonsinusoidal PWM (RS-HNSPWM) in stand-alone inverter-based distributed generation source to regulate and produce a sinusoidal voltage at the point of common coupling (PCC). Due to the nonlinear currents, drown by the nonlinear loads, V_PCC becomes nonsinusoidal. The proposed controller takes V_PCC as an input and generates a nonsinusoidal reference waveform (V_ref) for firing the full bridge inverter switches with RS-HNSPWM method. The simulation results show that the proposed control method has the features such as: the thermal equalization in switches, very low THD and decreasing harmonic components at the V_PCC.