The Dual-Mode Control and Seamless Transfer Control Method of Three-Phase Inverter
Wang Mingyue1, Luo An1, Chen Yandong1, Huang Yuan1, Lü Zhipeng2
1. National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China; 2. China Electric Power Research Institute Beijing 100192 China
Abstract Regarding the inrush current when a inverter connects to the micro-grid and the DC voltage fluctuation when a inverter is cut off from the grid, this paper proposes a dual-mode control and seamless transfer control method of three-phase inverter. The control scheme combines steady-state control with transfer control. Wherein, the transfer control consists of soft-start virtual impedance and single loop current control. To avoid reverse energy flow, phase lead regulation of droop control and its frequency regulation scheme are presented in the processes of grid-connecting and grid steady controls. The control method can inhibit both the impacts of the converter output current and the grid-injection current when a inverter connects to the grid, and can effectively reduce the grid-injection current to avoid the imbalance of instantaneous current when a inverter is cut off from the grid. Simulation and experimental results verify the proposed method.
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2016, Vol. 31 
