Abstract
The capacitive-coupling inverter (CCI), compared with the inductive-coupling inverter (ICI), has little research on the impedance model considering the grid condition. To fulfill this gap, the single-input and single-output (SISO) impedance model for the three-phase CCI combined with the current control loop and phase-locked loop (PLL) is proposed in this paper. The transfer function of the capacitive-coupling filter and the PLL is derived based on the small-signal model. Then, the CCI impedance model is developed in the ideal grid condition by the harmonic linearization method. In the weak grid condition, the influence of grid impedance is significant and the frequency coupling of the SISO impedance model is taken into consideration. The theoretical impedance model is proved to have precise descriptions through the ideal grid and weak grid condition, respectively. The correctness of theoretical analyses is verified by simulation.
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