基于双馈机组风电场并入网后的自适应保护

Research Based on Distribution Network Adaptive-Protection When Doubly-Fed Unit Wind Farms Combine to Grid

随着风力发电技术的不断发展,风电机组数量及单机容量都在不断增加,这使得风电场对系统提供的容量比重增大;而且风速具有随机性,其控制也难以稳定,导致风场向系统提供的短路电流也在增大。那么随着风场大规模并网,对配电网的保护是不容忽视的。通过分析双馈风机特性及风机数学模型得知传统的继电保护已不能满足要求,为此引入了自适应保护,在剖析其原理的基础上论证了自适应保护可应用于并入风电场后的配电网的继电保护当中。

Accompanied with constantly development of wind power technology, the number of wind turbines as well as the capacity of single-machine has been increasing continually these resulting a higher capacity ratio supplied by wind farms to the system. Meanwhile because of the stochastic nature of wind speed and control difficult to stability the short circuit current feed by wind power station is also increasing. Thus, the study of distribution network protection cannot be neglected when the wind power plants merge in. Through the doubly-fed fan characteristic analysis it can be known the traditional protection methods can＇ t satisfy the requirement, so self-adaptive protection was introduced and then analyzed its principle. At last it can be drawn an inclusion that self-adaptive protection can be applied in distribution network protection when wind generators merge in.