Abstract

A pre-synchronization control strategy for grid-connected three-phase inverters is proposed in this paper ,to solve the problem of slow response of the conventional synchronous unit containing a phase-locked loop (PLL), based on the synchronization principle between the synchronous generator (SG) terminal voltage and the grid voltage when there is no power exchanged. In this paper, the voltage control loop and the frequency control loop is analyzed in detail. The influence of the phase tracking principle and parameters of the controller on transient responses of the system is fully discussed. The simulation and experimental results show that the improved three-phase inverter can track the grid voltage rapidly, accurately, and steadily, by using this control scheme without the PLL.

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