摘要
对风电大功率并联变流器环流进行分析,指出了造成并联环流的主要原因是各桥臂占空比z轴分量不相等。推导了变流器并联环流的平均数学模型,给出了两种环流抑制策略,并对这两种策略进行了对比研究,使用Matlab仿真两种控制方案并在搭建的小功率实验平台上进行实验。仿真和实验结果表明环流抑制策略的可行性,指出在变流器交流侧滤波电感较小的情况下采用第二种环流抑制策略能有效抑制并联环流,从而得到较好的控制性能和良好的电流波形。
The parallel circulation of the wind power converter is analyzed.The circulating current is caused by the difference of the z axis component of the duty cycle of the three phase bridge arm of the parallel converter.The average mathematical model of parallel circulation is derived.Two general circulation suppression strategies are compared and studied.Two control strategies are simulated by using Matlab,and a small power experiment platform is built to verify the experiment.Simulation and experimental results show the feasibility of the circulation suppression strategy.The filter inductance of the AC side of the converter is small under the condition,Second kinds of circulation suppression strategies can effectively restrain the shunt flow,thus better control performance and good current waveform can be obtained.
作者
周成
江宏玲
戴新荣
谢芳
ZHOU Cheng;JIANG Hongling;DAI Xinrong;XIE Fang(Anhui Institute of International Business,College of Information Engineering,Hefei 231131,China;Anhui&Huaihe River Institute of Hydraulic Research,Hefei 230088,China;Anhui Province Construction Engineering Quality Supervision and Inspection Station,Hefei 230088,China;Collaborative Innovative Center of Industrial Energy-saving and Power Quality Control,Anhui University,Hefei 230601,China)
出处
《安庆师范大学学报（自然科学版）》
2019年第4期64-69,共6页
Journal of Anqing Normal University(Natural Science Edition)
基金
安徽大学博士启动经费（J01001961）
安徽省教育厅自然科学研究重点项目（KJ2017A861）
国家青年自然科学基金（51607002）
关键词
风电大功率变流器
直流侧并联
环流抑制
predictor wind high-power converter
DC side parallel connection
circulation suppression
