Abstract
Unbalanced and nonlinear loads connected to micro grids (MG) with local distributed energy resources (DERs) are two of the leading causes of power quality problems. Nonlinear loads introduce voltage and current harmonics, and single phase loads can cause voltage and current imbalances in a three phase network. This paper presents a hierarchical control scheme for voltage controlled photovoltaic (PV) inverters with unbalanced and nonlinear loads in micro-grids. The hierarchical control consists of primary control, voltage compensation control (VCC) and a DC voltage regulator (VR). The primary control scheme controls active and reactive power sharing and the VCC regulates the unbalanced voltage and harmonics distortion. The effectiveness of the scheme is verified using Opal-RT real-time simulation and experimentally using control hardware-in-the-loop. The voltage distortion at point of common coupling (PCC) decreased from 6.38 percent to 1.91 percent after compensation, while the unbalanced and harmonic load are shared proportionally among the DG units.
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