Abstract
Aiming at the problem of photovoltaic grid-connected inverter system running under multiple disturbances, a first-order active disturbance rejection control (1st-LADRC) strategy is proposed. First, the mathematical model of photovoltaic grid-connected system is analyzed. Then, 1st-LADRC is introduced into the control system to enhance the robustness of the system to uncertainty. And complete the observation, estimation and compensation of disturbances by designing an extended state observer. Furthermore, the stability, tracking and convergence of the proposed control strategy are analyzed by frequency domain analysis. Finally, a digital simulation of the three-phase photovoltaic grid-connected inverter system was carried out on the MATLAB/Simulink platform, and the effectiveness of the control strategy was verified by the simulation results of various working conditions.KeywordsPhotovoltaic grid-connected inverterFirst-order active disturbance rejection control strategyFrequency domain analysis
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