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For LCL-filtered grid-connected inverters, classical control methods such as the proportional grid voltage feedforward, the harmonic quasi resonant (HQR) control etc., are widely utilized to achieve low current distortion. However, the system stability is easily challenged by the grid impedance and the increased number of the paralleled inverters. Therefore, this paper orients to guarantee the harmonic...
Grid connected inverter can attenuate high frequency harmonics effectively through an LCL filter which has potential benefits for the inverter to get higher harmonic performance with lower switching frequency and less inductance in contrast with L filter. However, LCL filter is a third order system without damping and easy to resonate. In order to eliminate resonance and improve the system stability,...
A new equivalent input circuit of one-cycle-controlled (OCC)PFC converter is built, based on which, the current phase lag issue especially outstanding at low ratio of switching frequency to line frequency is analyzed, and a novel current phase lag compensation scheme by controlling the voltage across the switch is proposed to reduce the phase lag of line current relative to line voltage. Implementation...
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