大型双馈风机LVRT功能实现原理及测试验证

The Principle Realization and Testing Verification for LVRT Function of High-capacity Double-fed Wind Turbine

近年来,随着风力发电所占比例逐渐增大,风力发电所带来的安全问题已不容忽视,因此,电网对并网风机提出了严格的低电压穿越(LVRT)能力要求。分析双馈型风力发电机组(DFIG)的数学模型及其实现LVRT功能的原理,介绍了几种保护方案,包括转子侧的Crowbar电路、直流侧的Chopper电路以及综合考虑转子侧和直流侧的保护方案。在实际风场进行了LVRT测试,通过数据分析,保护方案的有效性得到验证。

Nowadays,with the proportion of wind power in the whole power grid increasing dramatically,the security issues brought by the wind power can't be neglected anymore.As a result,all power corporations proposed strict low voltage ride through(LVRT) demands to the wind farms which have already connected to the grids.At first this paper analysed the physical module of double fed induction generator(DFIG) and the principle for the wind turbines to achieve LVRT capacity.Then,it introduced several Crowbar schemes for protecting the rotor of the DFIG as well as the Crowbar and Chopper method.At last,practical LVRT testing of certain type of wind turbine has been conducted in a wind farm.The results proved LVRT capacity of the wind turbine with Crowbar and Chopper circuits.