Multivariable State-Feedback Controller Design for PV Inverter Connected to a Weak Grid

This paper presents a robust multi-input multi-output (MIMO) state-feedback control scheme for photovoltaic (PV) inverter connected to weak grid. For grid, the point of common coupling (PCC) voltage is very sensitive power disturbances and it dynamically coupled PLL dynamics. So far, most methods do not take into accounts these couplings. Therefore, in this paper, MIMO controller was designed taking account dynamics phase-locked loop (PLL) effects between PCC active enhance system’s robustness. As result, performance PV interfaced grid yielded. In addition, sensitivity system eliminated, allowing use larger bandwidth even Based on eigenvalues analysis method, comparative study proposed method conventional vector performed. The verified with simulations PLECS real-time RT Box. results show that preserves stability robustness against any change strength, generated bandwidth.