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In this paper, the inverter output impedance is passivized for solving the harmonic and the stability problems in the multiparallel inverters. The harmonics are easily aroused because of the disturbances, and the system stability is challenged by the grid impedance. Based on the simplified equivalent impedance model, the two problems are analyzed in the low-frequency (LF) band and the high-frequency...
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 inverters with the proportional grid voltage feedforward usually achieve satisfied output impedance, which contributes to the low order harmonic elimination. However, a potential positive feedback link is introduced, which decreases the phase margin significantly or even trigger instability when inverters are connected to utility with the non-negligible grid impedance. To maintain the...
The under-damped resonance phenomenon in grid-tied LCL-filtered inverters yields much difficulty in designing the controller. By adding one or more state feedback, the multi-variable feedback control methods are commonly used. However, the revealed studies are quite limited and cannot explain the essential mechanism of the multi-variable feedback control. In this paper, a systematic analysis method...
The under-damped resonance in the grid-tied LCL-filtered inverter yields much difficulty in designing the controller. One interesting solution is that if the weighted average of currents through two inductors is fed back, the close-loop control based on the feedback of the weighted current is easily designed to maintain satisfactory dynamic. However, it has been proved that under-damped conjugate...
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