Abstract
Distributed wind power generation system is a clean ideal renewable resource, and its generation equipment is easy to install. The distributed wind power generation system can effectively improve the utilization of wind energy and the reliability of distribution network, thus the proportion of wind power in the total power grid is increasing and its impact on the grid has become larger and larger. The short circuit fault of the grid causes the wind turbine's over-current which not only brings great damage to the turbine itself but also affect the stability of the power grid. Therefore, effective measures should be taken to achieve wind turbine's low voltage ride through (LVRT). This paper presents a new method of wind turbine's LVRT, based on the series compensation principle. The design principle of the LVRT device parameters is also given. The compensation effects of the LVRT method are vertified by PSCAD simulation. By comparing the dynamic response of the wind turbine before and after the LVRT compensation, we can conclude that the effects of the new LVRT Strategy are remarkable in compensating the voltage drop of the grid, the restoration of active power and providing reactive power to support the grid and keeping the stability of converter's DC voltage. The new method can help achieve the wind turbines' LVRT.
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