Stabilization Design of Three-Phase LCL-Filtered Grid-Connected Inverter Using IDA-PBC Controller

With the aim of improving stability renewable energy system with high permeability in weak grid, a modified passivity-based control based on interconnection and damping assignment (IDA) is presented for LCL-filtered grid-connected inverters to eliminate interactive resonances. The object modeled form port-controller Hamiltonian, including partial differential stored function. On premise ensuring Lyapunov stability, more flexible matrix design method applied simplify process. closed-loop ensured selected Hamiltonian function at desired balanced point. Moreover, step-by-step process gains provided guarantee stable operation fast dynamic response under variation complex grid impedance. designed injected parameters, considering effect delay, it possible real part inverter output admittance be positive within switching frequency. performance robustness proposed are validated via simulated experimental results both unbalanced conditions.