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Lyapunov Function Based Control Strategy for Single-Phase Grid-Connected PV system with LCL-filter

A modified Lyapunov function based control (LFBC) scheme for single-phase two-stage grid-connected photovoltaic system with LCL-filter is presented. The modeling and stability analysis of system is done by considering the effect of DC-link capacitor to achieve global stability of the system with the uncertainty of solar irradiance. The proper selection of controller gain and stability of the system is studied. Further, an active damping method considering capacitor voltage feedback loop is also implied to eliminate the effect of resonance and improves the power quality. The performance and analysis of the proposed LFBC is validated on simulink and experimental environment under variation with solar irradiance.