Abstract
Grid-connected inverters usually use phase-locked loop (PLL) to obtain synchronization information of the grid voltage. In a weak grid, grid impedance cannot be ignored. Voltage disturbance at the point of common coupling (PCC) can lead to the deviation of the output phase angle of PLL, which affects the operation stability of the grid-connected inverter. This paper discusses the influence of the PLL under non-unit power factor, and proposes a compensation control method that can effectively improve the stability of the grid-connected system. First, the small signal model of the LCL-type three-phase grid-connected inverter considering PLL is established in the dq-frame. Then, the equivalent output impedance characteristics of the grid-connected inverter with the small signal compensation are analyzed. The proposed method can ensure that the grid-connected inverter maintains a good stability margin, and enhance the stability and dynamic performance of the grid-connected inverter. Simulations are carried out to verify the theoretical analysis.
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