摘要
应用于交直流混合配电网的级联型电力电子变压器(PET)能够实现柔性互联、电压变换、电气隔离和功率控制等多种功能。由于级联型PET内部的级联H桥级和双有源桥级之间电气耦合程度高且控制目标不同,提出一种分级解耦控制方案,在简化控制架构的同时可实现各级的独立灵活控制。此外,针对级联型PET采用多个功率单元输入串联输出并联的拓扑结构,提出一种基于分级解耦控制的串联均压并联均流控制策略,以降低参数差异的影响。研制了一台额定交流电压为10 kV、额定直流电压为750 V、额定容量为500 kVA的级联型PET。实验结果验证了该控制方案工程应用的可行性及有效性。
Cascaded power electronic transformer(PET)for hybrid AC/DC distribution networks can realize multiple functions such as flexible interconnection,voltage conversion,electrical isolation and power control.Due to the high degree of electrical coupling between the cascaded H-bridge and the dual active bridge stage in the cascaded PET with different control objectives,a hierarchical decoupling control scheme is proposed to simplify the control architecture and achieve independent flexible control at all levels.Since the topology of cascaded PET adopts input-series output-parallel(ISOP)of multiple power units,a control strategy of series voltage equalization and parallel current equalization based on hierarchical decoupling control is proposed to reduce the influence of parameter differences.A cascaded PET with rated AC voltage of 10 kV,rated DC voltage of 750 V and rated capacity of 500 kVA is developed,and the experimental results verify the feasibility and effectiveness of the engineering application of the control scheme.
作者
魏星
朱信舜
袁宇波
周启文
葛雪峰
杨晨
WEI Xing;ZHU Xinshun;YUAN Yubo;ZHOU Qiwen;GE Xuefeng;YANG Chen(NR Electric Co.,Ltd.,Nanjing 211102,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2021年第8期194-199,共6页
Automation of Electric Power Systems
基金
国家重点研发计划资助项目(2017YFB0903300)
国网江苏省电力有限公司科技项目(J2019126)的资助。
关键词
交直流配电网
电力电子变压器
级联型变换器
分级解耦
串联均压
并联均流
AC/DC distribution network
power electronic transformer
cascaded converter
hierarchical decoupling
series voltage equalization
parallel current equalization
