Voltage regulation and harmonic compensation in stand-alone inverter-based distributed generation using non-sinusoidal hysteresis voltage control

During the islanding mode, whenever the power grid is not available, distributed-generation (DG) produces sinusoidal output voltage and supplies nonlinear loads, thus voltage at point of common coupling (PCC) becomes non-sinusoidal. The situation gets particularly aggravated during the islanding mode, when the power grid is not available. This deteriorates the performance of other loads connected in parallel. In this paper a scheme based on non-sinusoidal hysteresis voltage control (NSHVC) is proposed to regulate and produce a sinusoidal voltage at the PCC. It will be demonstrated that without any current sensor or compensating device, the individual harmonic components and THD of the supply voltage at the PCC can be reduced to the desired level. Simulations have been performed to supply the viability of the proposed scheme and all of the results are presented.