基于最优功率分配的多端直流网络改进下垂控制策略

发布时间：2018-01-22 22:23

本文关键词： 改进下垂控制铜耗最小多端直流输电最优功率分配可调容量　出处：《电工技术学报》2016年09期 　论文类型：期刊论文

【摘要】：由于多端直流系统各输电通道距离不一致以及直流线路本身电阻较大,导致远距离、大容量直流输电系统的铜耗较大。为了实现整个系统铜耗最小的站间协调控制,构建未考虑本地负荷与考虑本地负荷时直流电压下垂系数的计算方法,提出一种改进的直流电压下垂控制策略。引入换流站可调容量大小,使得各换流站"量力而行"地参与下垂控制功率调整。利用PSCAD/EMTDC建立该四端直流系统的详细模型,仿真验证了正常运行及故障工况下该系统的运行特性。结果表明,所提出的控制方法可有效减少直流系统铜耗,有效改善交流侧故障引起的直流侧功率振荡,实现紧急功率支援。
[Abstract]:Because the distance between transmission channels of multi-terminal DC system is not consistent and the resistance of DC line itself is large, it leads to long distance. In order to realize the coordinated control between stations with minimum copper consumption of the whole system, the calculation method of sag coefficient of DC voltage without considering local load and considering local load is constructed. An improved droop control strategy for DC voltage is proposed. The adjustable capacity of converter station is introduced. Each converter station can take part in the droop control power adjustment according to its capacity. The detailed model of the four-terminal DC system is established by using PSCAD/EMTDC. The simulation results show that the proposed control method can effectively reduce the copper consumption of DC system and effectively improve the DC side power oscillation caused by AC side fault. Implement emergency power support.
【作者单位】：强电磁工程与新技术国家重点实验室(华中科技大学);
【基金】：国家自然科学基金资助项目(51377068)
【分类号】：TM721.1
【正文快照】： 0引言由于我国能源分布与负荷需求在区域上不一致的矛盾,导致大容量、远距离的输电方式将成为我国电力输送的重要支撑,其中多端直流输电技术将成为解决我国输电走廊紧缺与大规模可再生能源并网的有效技术手段之一[1,2]。多端直流输电是指3个及以上的换流站,通过串联、并联或混

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