变压器对风电机组低电压穿越性能的影响

The Influence of Wind Turbine Transformer on Low Voltage Ride Through Behavior of Wind Turbine

低电压穿越(LVRT)能力是风电机组并网特性的重要考核指标之一。风电机组的关键电气部件如变流器、主控制器、变桨控制系统等,对于风电机组实现LVRT具有至关重要的作用,因此得到了广泛研究与关注。然而,目前风电机组均采用一机一变方式进行并网,升压变压器对风电机组LVRT特性的影响也不容忽视。在此通过分析电压跌落对风电机组出口变压器的影响,进而得出风电机组出口变压器在电压跌落时的电压非线性输出特性。最后,通过现场试验证实了风电机组出口变压器对风电机组LVRT特性的重要影响。

Low voltage ride through（LVRT） behavior is one of the key indices of wind turbine grid-integration evaluation.The key electric components of wind turbine,such as converter,control system, pitch system are researched and analyzed wide spread as they have important influence on the LVRT ability of wind turbine.However, recently single wind turbine connected into grid with a transformer, the influence of wind turbine transformer on LVRT behavior of wind turbine is also non-ignorable.The influence of voltage dip on wind turbine transformer is analyzed and tben non- linear voltage output characteristic of wind turbine transformer during voltage dip are presented.Finally, the important influence of wind turbine transformer on LVRT behavior of wind turbine is verified by on-site testing.