Harmonics detection based control of solar-BESS microgrid with grid synchronization

Abstract

This paper proposes a solar-battery energy storage system (BESS) based microgrid with the harmonics detection based control. Besides, the seamless transition capabilities, the proposed microgrid mitigates the power quality disturbances because of highly nonlinear load connected at point of interconnection (PIC). In this context, the voltage source converter (VSC) is controlled in grid connected and islanded mode depending on the availability of utility. The voltage control and current control are utilized together with synchronization control to synchronize a three phase microgrid to the utility. The harmonics detection current control forces the extracted fundamental current to be sinusoidal at highly nonlinear loads. Moreover, a PV (Photovoltaic) feed forward term (PVFFT) is also included in harmonics detection control for injection of extracted solar PV power to the distribution system under grid connected mode and to improve the dynamic behaviour under climate changes. Simulation and experimental results of solar-BESS based microgrid are presented under numerous operating states.