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基于多端柔性直流输电的风电并网控制研究

DOI: 10.13334/j.0258-8013.pcsee.2014.S.005, PP. 32-38

Keywords: 多端柔性直流输电,内环电流控制器,PSCAD/EMTDC,风电并网

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Abstract:

对于大规模的海上风电并网,两端柔性直流输电网并网已无法满足要求,并且交流并网也存在着频率、电压失稳和远距离输电经济性差的问题。使用多端柔性直流输电是未来海上风电并网的发展方向。对于风电场和无源网络而言,有功功率有时是没有的,所以采用多端柔直并网时,与风电场以及无源网络相连的换流站便无法继续采用过去的定有功功率控制。该文抛弃利用有功功率控制的方式,将风电场当作一个无源网络,将电压参考值取为定值。并利用此方法设计了四端柔性直流环网模型,其中加入了两个风电场和一个无源网络,以证明多端柔直系统可以连接不同地域风电场和没有电厂的偏远区域。并且在PSCAD/EMTDC上,将多端柔直并网模型进行了仿真模拟。结果表明,利用此控制方法的四端柔性直流可以稳定运行,故障时扰动较小。

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