SMES用于双馈发电机故障穿越的研究

Application of SMES to Improve Fault Voltage Ride Through Capability of Doubly Fed Induction Generator

近年来随着风电并网容量的迅速增加,风电场脱网对电力系统的影响日益严重。本文首先介绍了风电场故障穿越的技术要求,将双馈感应发电机(DFIG)控制系统分为风机控制分系统、转子侧和定子侧变频器控制分系统,然后建立超导磁储能(SMES)3阶相量模型,并采用SMES提高DFIG故障穿越能力和动态响应速度,最后在Matlab/Simulink中搭建SMES+DFIG仿真模型,并采用中国的低电压穿越(LVRT)标准和美国的高电压穿越(HVRT)标准验证SMES辅助风电机组实现故障穿越的能力。

Recently, with the rapid increase of wind power generation, the trip off of wind farm will have an increasing impact on power system .In this paper, the fault ride through grid codes of wind farm is introduced at first, then a third-order phase model is used for superconducting magnetic energy storage （SMES）. The integrated control system of DFIG is divided into wind generator control system, rotor side and the stator side converter control system. SMES unit is used to improve fault ride through capability and dynamic response of DFIG. At last, the simulation model of SMES＋DFIG are built in Matlab/Simulink, high voltage ride through （HVRT） grid code of the United States and low voltage ride through （LVRT）grid code of China are used to verify the ability of the SMES unit to avoid wind turbine generator from being disconnected from the grid.