LCL filter design in T-type three-level grid-connected inverter

With the rapid development of photovoltaic (PV) power generation, technology of the grid-connected photovoltaic system becomes an important part of the photovoltaic power generation. Based on this background, grid connection techniques of T-Type three-level grid-connected inverter with an LCL filter is studied in this paper. The subject combines SPWM modulation strategy and dual current loop control strategy. Due to the coupling relationship among LCL-filter parameters, it is complicated to design the L and C parameters in the LCL filter. This paper analyzes the selection of LCL-filter parameters. The control strategies of this paper are carried out under the MATLAB/Simulink simulation environment. Correctness and feasibility of control strategies are verified through the simulation results.