双向功率变换器自治运行控制策略  

Autonomous Operation Control Strategy for Bidirectional Power Converter

作　　者：曹国栋[1] 韩肖清[1] 杨宇[2] 王磊[1] 肖春[2] CAO Guodong;HAN Xiaoqing;YANG Yu;WANG Lei;XIAO Chun(Shanxi Key Lab of Power System Operation and Control,Taiyuan University of Teelmology,Taiyuan 030024,China;State Grid Shanxi Electric Power Company,Taiyuan 030001,China)

机构地区：[1]电力系统运行与控制山西省重点实验室(太原理工大学),太原030024 [2]国网山西省电力公司,太原030001

出　　处：《电力系统及其自动化学报》2018年第6期53-59,共7页Proceedings of the CSU-EPSA

基　　金：山西省煤基重点科技攻关项目(MD2014-06);山西省回国留学人员科研资助项目(2015-重点1);山西省电力公司科技资助项目(SGTYHT/14-JS-188);山西省重点研发计划资助项目(201603D421007)

摘　　要：双向功率变换器是交、直流混合微电网中的关键设备。本文在分析低压微电网下垂特性的基础上,提出一种双向功率变换器自治运行控制策略,针对交、直流母线电压性质不同的特点,根据子网电压允许波动范围,分别对其进行了归一化处理,并以交、直流子网实时负载率相同为准则,设计了双向功率变换器有功-电压控制环。为使交流子网频率稳定,在充分利用双向功率变换器剩余容量前提下,设计了变换器无功-相角控制环。仿真和实验结果表明,所提出的控制策略能够实现交、直流子网间功率双向平滑传输,维持子网母线电压及频率稳定,确保低压交、直流混合微电网自治运行。Bidirectional power converter is a key device in the hybrid AC/DC microgrid. In this paper,an autonomous operation strategy is presented for a bidirectional power converter based on the analysis of P-V droop characteristics of alow-voltage microgrid. Considering that the AC/DC bus voltages are different,they are normalized according to the fluc-tuation range of sub-microgrid voltage. A P-V control loop of bidirectional power converter is designed according to thecriteria of equal real-time loading rate in AC/DC sub-microgrids. Under the premise of fully utilizing the remaining capacity of the bidirectional power converter,a Q-δ control loop is designed to maintain the frequency stability in the ACsub-microgrid. Simulation and experimental results indicate that the proposed control strategy can realize a smooth bidi-rectional power transfer between AC and DC sub-microgrids and maintain the stability of sub-microgrid＇s bus voltageand frequency,which ensures the autonomous operation of low-voltage hybrid AC/DC microgrid.

关 键 词：双向功率变换器 低压微电网 交、直流混合微电网 自治运行 

分 类 号：TM721[电气工程—电力系统及自动化]