三相逆变器的双模式及其平滑切换控制方法

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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.

Key words： Micro-grid three-phase inverter dual-mode control seamless transfer

Received: 08 July 2014 Published: 01 September 2016

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TM76

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