适用于动态电压恢复器的最小能量柔性切换控制策略  

The Minimum Energy Soft-Switching Control Strategy for Dynamic Voltage Restorer

作　　者：涂春鸣[1] 孙勇[1] 郭祺[1] 姜飞[2] 张丽[1] Tu Chunming;Sun Yong;Guo Qi;Jiang Fei;Zhang Li(National Electric Power Conversion Control Engineering Technology Research Center Hunan University Changsha 410082 China;School of Electrical and Information Engineering Changsha University of Science & Technology Changsha 410004 China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),长沙410082 [2]长沙理工大学电气与信息工程学院,长沙410004

出　　处：《电工技术学报》2019年第14期3035-3045,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金青年基金(51707014);湖南省自然科学基金青年基金(2018JJ3534);湖南省教育厅科研项目(17C0040)资助

摘　　要：动态电压恢复器(DVR)采用最小能量补偿策略可有效减少其有功输出,增大补偿时间。考虑到系统电压跌落往往伴随着相角跳变,以及传统最小能量补偿在电网电压跌落和恢复时也会造成负载电压相角偏移,进而影响敏感负荷的安全运行,提出一种最小能量柔性切换控制策略。该控制策略可保证DVR有效减少有功输出的同时,在电网电压跌落时平滑进入最小能量补偿,而在电网电压恢复时又可平滑退出最小能量补偿,DVR输出电压相角在整个补偿过程中做到平滑过渡,由此可解决负载电压的相角跳变问题。此外,考虑到了DVR输出电压约束时的情形,通过对DVR参考电压的动态调节,使其在补偿的各个时期都不超过DVR输出的极限水平。实验和仿真结果验证了理论分析的正确性。The minimum energy compensation strategy for dynamic voltage restorer(DVR)can effectively reduce the output of active power and prolong the compensation duration.The grid voltage sag is often accompanied by phase angle jumping,and the traditional minimum energy compensation also causes phase angle jumping in load voltage when grid voltage sag and recovery.Therefore,a minimum energy soft-switching control strategy is proposed,which ensures DVR smooth into and smooth out the minimum energy compensation.Thus,it can solve the problem of load voltage phase angle jumping as well as reducing the output of active power.In addition,taking into account the maximum output capability of DVR,the reference voltage can be dynamically adjusted within the limit level during the compensation.The simulation and experimental results verify the correctness of the theoretical analysis.

关 键 词：动态电压恢复器 最小能量补偿 相角跳变 柔性切换 

分 类 号：TM464[电气工程—电器]