并联型永磁直驱风电系统的环流分析及其控制-中国电机工程学报.PDF

第31 卷 第6 期 中 国 电 机 工 程 学 报 Vol.31 No.6 Feb.25, 2011 38 2011 年2 月25 日 Proceedings of the CSEE ©2011 Chin.Soc.for Elec.Eng. 文章编号：0258-8013 (2011) 06-0038-08 中图分类号：TM 85 文献标志码：A 学科分类号：470·40 并联型永磁直驱风电系统的 环流分析及其控制 李瑞，徐壮，徐殿国 (哈尔滨工业大学电气及自动化学院，黑龙江省 哈尔滨市 150001) Analysis and Control of Circulating Current in Parallel Permanent-magnet-direct-drive Wind Power System LI Rui, XU Zhuang, XU Dianguo (School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China) ABSTRACT: Parallel connection technique can improve the 空比零轴分量的不一致造成的。在上述分析的基础上提出一 power capacity of the permanent-magnet-direct-drive wind 种环流控制器，在不影响其它被控量且不增加硬件开销的前 power system effectively. But it causes some problems, such as 提下抑制了机侧环流和网侧环流，解决了环流引起的不均 circulating current, unbalanced current distribution, etc. To 流、波形畸变等问题，提高了系统的可靠性和效率。仿真和 solve these problems, this paper proposed a new topology of 实验结果验证了所提方法的正确性。 permanent-magnet-direct-drive wind power system. Its average 关键词：风力发电；永磁同步发电机；并联；环流；平均 model and circulating current were analyzed. It can be seen that 模型 the generator-side and line-side circulating currents are independent with each other. Moreover, the circulating current 0 引言 is caused by the zero-axis component discrepancy of the 目前很多风力发电机功率已达近10 MW [1-4] ， three-phase bridge duty between the parallel modules. Based 而在永磁直驱风力发电系统中，发电机需要通过全 on the above analysis, the circulating cu