Control strategy of LCL photovoltaic grid connected inverter based on generalized predictive control
JIANG Yong
WANG Shaoshuai
Abstract：After grid connection,the current harmonics of photovoltaic(PV)grid-connected inverters may cause voltage distortion in the power grid.This study proposes a generalized predictive control(GPC)-based inverter-side current(ISG)feedback control strategy.The mathematical model of the voltage-type LCL single-phase PV grid-connected inverter system is analyzed,and the GPC law is derived,with the prediction and control horizons determined.Results showed that,compared with the traditional proportional resonant control strategy,GPC can effectively reduce the harmonic content of the grid-connected current and exhibits strong robustness.The control strategy meets the grid connection requirements,enabling the inverter output current to accurately track the frequency and phase of the grid voltage and ensuring that the total harmonic distortion(THD)remains below 5.00%.
Keywords：grid-connected inverterharmonicsLCLgeneralized predictive control(GPC)
Publication Date：2025-04-25
Pages：3( 63-65 )