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Multi-Objective Control Algorithm for Solar PV-Battery based Microgrid

This paper deals with a versatile control strategy for voltage source converter (VSC) in grid tied mode (GTM) and standalone voltage control mode (SVCM) using mixed order sinusoidal integrator phase locked loop (MOSSI-PLL) based control. The microgrid is based on voltage source converters (VSC) acts as an active power filter, harmonics and achieves the harmonic elimination compensation and reactive power compensation. Under normal condition, the grid tied solar photovoltaic (PV)-battery hybrid system works in current control mode (CCM) so as to provide the generated power to the grid and the nonlinear load. When solar PV-battery microgrid hybrid system is cut off from the main grid then proposed control detects the islanding condition and transfers the VSC control to SVCM to provide the constant voltage across the load. High order adaptive filter based synchronization controller is implemented for smooth switching to standalone mode and vice versa with high reliability and droop-less control. A MOSSI based control achieves grid current, PCC (Point of Common Coupling) voltage, and battery current under defined modes and helps in harmonics mitigation and enhancing the power quality of the single phase grid system though extracting power from the solar PV array. The effectiveness of the proposed structure of MOSSI-PLL is evaluated through test results under different modes and conditions on the developed prototype in the laboratory.