SyRG-PV-Battery Based Standalone Microgrid with D-EPLL Based VSC Control Algorithm

Abstract

This paper proposes a solar photovoltaic (PV)-battery-pico-hydro turbine driven synchronous reluctance generator (SyRG) based microgrid. The SyRG driven by pico-hydro turbine is the only AC generator, so a VSC (Voltage Source Converter) with damped E-PLL (Enhanced Phase Locked Loop) based control algorithm provides voltage regulation, harmonics mitigation and load balancing while feeding the nonlinear loads. To provide power balancing, a storage battery is connected across the DC link of VSC through a DC-DC bidirectional converter (BDC). The BDC with a storage battery, provides the optimal power flow to maintain the power equilibrium between load and sources through DC bus voltage regulation. Moreover, BDC mitigates the second harmonic current from the battery charging and discharging current. A solar PV array is connected to the DC bus of VSC. For extracting the maximum power from the solar PV array, the MPPT (Maximum Power Point Tracking) is achieved by BDC. In the laboratory, a prototype of the system is developed and tested under different situations to confirm the effectiveness and viabilty of control strategy.