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has been cited by the following article:

• TITLE: Micro-Grid Smooth Switchover Method Based on Controller State Following

  AUTHORS: Yang Fu, Lisha Huang, Jingjing Zhao

  KEYWORDS: Micro-Grid, Smooth Switchover, Controller State Following

  JOURNAL NAME: Journal of Power and Energy Engineering, Vol.3 No.4, April 14, 2015

  ABSTRACT: Micro-grid smooth switchover between different operation modes is important for steady operation and reliable power supply of micro-grid. In order to reduce the transient fluctuation of voltage and frequency during switchover, this paper proposed a new switchover method based on controller state following. When transferring to island mode, the control method for inverter of storage device changed from PQ control to V/f control. Before switchover, the output of V/f controller is always following the output of PQ controller. So that the sudden change of output is avoided at the moment of switchover. A micro-grid model with photovoltaic and battery is built on DIgSILENT Power Factory simulation software, to simulate micro-grid switchover from grid-connected mode to island mode. Results show this method can effectively suppress the transient fluctuation of voltage and frequency, and reduce the influence of transient process on power grid. This conclusion has important practical significance on micro-grid smooth switchover from grid-con- nected mode to island mode.