摘要
在未来可再生电能传输和管理微网(future renewable electric energy delivery and management,FREEDM)中固态变压器间会因输出电压偏差及输出阻抗的不匹配而产生环流,孤岛模式下尤为严重,为此,在下垂控制器中引入固态变压器(solid state transformer,SST)间输出电压偏差反馈调节,减小输出电压相角差和幅值差;采用基于模糊控制理论的瞬时环流反馈,进行动态虚拟阻抗调节,使得SST输出阻抗按额定功率精确匹配。仿真及分析表明,电压偏差反馈调节配合动态虚拟阻抗控制可以有效地抑制SST间环流,同时提高SST输出电压的稳定性。
In the future renewable electric energy delivery and management （FREEDM） microgrid, there will be circulating currents among solid state transformers （SSTs） due to the voltage differences and disproportionate output impedances, particularly in the islanding mode. The output voltage differences were fed back to reduce the errors of their phases and amplitudes in the droop controller. Meanwhile, the adjustable virtual impedance based on the fuzzy control is adopted to make the output impedance of SST match its rated power more exactly using instantaneous circulating current feedback. Simulations and analysis show that the control strategy can restrain the circulating currents well, and can improve the output voltage stability of SST.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第31期5563-5570,共8页
Proceedings of the CSEE
基金
上海市自然科学基金项目(13ZR1444400)
上海市科委资助项目(13DZ1200403)
国家高技术研究发展计划(863计划)项目(2013AA040302)~~
关键词
未来可再生电能传输和管理微网
固态变压器
电压偏差反馈调节
动态虚拟阻抗
环流抑制
future renewable electric energy delivery andmanagement （FREEDM） microgrid
solid state transformer
voltage differences regulating
adjustable virtual impedance
circulating current restraining
