A Method for Power Conditioning with Harmonic Reduction in Microgrids

Abstract

This paper presents a control method of Renewable Energy Sources (RES) to reduce the harmonic content of the distribution system to which are connected, such as a Microgrid. By this method the RES is acting as a Power Conditioner and its supplying system consists of a buck-boost converter connected back-to-back to a polarity swapping inverter. A RES or a Distributed Generator (DG) such as a microturbine is synchronized to the distribution system, which is assumed to be distorted by a high-order voltage harmonic. Utilizing the proposed method, the RES not only exports its output power to the grid, but also reduces the existing harmonic distortion, improving voltage quality at the Point of Common Coupling (PCC). Simulations in Matlab/Simulink platform have been performed in order to verify the effectiveness of the suggested approach to reduce harmonic content.