LCL Filter Design Based on Ripple Current Minimization Approach for Grid-Connected Inverter Application

The fast-growing demand for renewable energy has stimulated the rapid development of semiconductor devices and power electronic converter technologies. The grid-connected inverter has turn out to be normal in any distributed generation system. LCL filter is commonly adopted to interconnect an inverter to a utility grid, owing to its parametric performance. However, the common issue regarding resonance frequency and design constraints complexity remains unsolved entirely. In this paper, a simple LCL filter design to address these issues is proposed. A ripple current minimization approach is adopted in the systematic design process to determine optimized reactive components' value and mitigate its resonance frequency. Design feasibility is simulated in the Matlab/Simulink environment and extensive experimental work was carried out to validated the results against the IEC61000-3-2 standards.