Low voltage ride-Through strategy based on virtual synchronous generator control

[摘要] Inverters controlled in virtual synchronous generator(VSG) method is able to operate in both grid-connected mode and islanding mode. Due to this characteristic, this paper put forwards a low voltage ride-through(LVRT) strategy which is based on VSG control. If the grid voltage sags, VSG can limit the output current amplitude and meanwhile inject reactive power to the grid. Once the voltage drop time exceeds the maximum ride-through time, VSG would smoothly switch to islanding mode and continues to carry loads independently. The proposed strategy achieves a control algorithm unity between normal operating and grid voltage sag status in grid-connected mode. Simulations can support the validity of the strategy.

[发布机构] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, China^1

[效力级别] 机械制造 [学科分类] 航空航天科学

[关键词] Grid-connected modes;Islanding modes;Low voltage ride through (LVRT);Low-voltage ride-through;Output current;Ride-through;Smoothly switches;Voltage drop