This paper proposes a grid-voltage-weighted feedforward control scheme based on the quasi-proportional resonance (QPR) controller. This scheme introduces compensatory terms with different proportional coefficients in the voltage feedforward, controlled by the QPR . . This paper aims at analyzing and compensating the har-monic current effects in the Grid-Connected Photovoltaic (PV). Tradi-tional harmonic compensation methods extract all harmonic current, so that the compensator of harmonic current tends to be complex and less flexible. Therefore, the design of. . Abstract—The capacitive-coupling grid-connected inverter (CGCI) is able to achieve reactive power compensation and active power transfer simultaneously with a low operational voltage. The CGCI is coupled to the point of common coupling (PCC) via a second-order LC circuit, which makes its modeling. . Modeling of Quasi-PR Controlled Inverter and Its Stability C t is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rig ollers: quasi-proportional resonance (quasi-PR), proportional integral (PI), and proportional resonance (PR). . MATLAB/Simulink simulation results showed that the quasi-PR Grid-Connected inverter based on improved GA-PSO algorithm had lower harmonic content of the grid-connected current under the working conditions of load change and DC voltage fluctuation, which en-hanced the adaptive degree of the. . A grid-connected inverter (GCI) with LCL filters is widely used in photovoltaic grid-connected systems.
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