混合微电网中三相变换器的控制策略  

Control Strategy of Three-phase Converter in Hybrid Microgrid

作　　者：李慧蓬[1] 韩肖清[1] 杨宇[2] 王鹏[1] 

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024 [2]山西省电力公司,山西太原030001

出　　处：《河南科技大学学报（自然科学版）》2014年第2期55-61,7,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家国际科技交流与合作专项基金项目(2010DFB63200);山西省青年科技研究基金项目(2011021015-2);山西省自然科学基金项目(2009021021);山西省高等学校中青年拔尖创新人才支持计划基金项目

摘　　要：混合微电网中一般通过三相变换器连接交流子网和直流子网,其控制策略对整个微电网运行特性有显著影响。混合微电网并网运行时,由大电网保证功率平衡,变换器控制策略用于维持直流母线电压恒定;孤岛运行时,设计的协调控制系统保证微电网内部功率平衡,变换器控制策略用于保持交流母线电压稳定。当微电网内部分布式电源功率以及负荷功率发生变化时,该变换器可以在整流、逆变和停机3种状态间平滑切换。最后,通过算例仿真验证了控制策略的可行性和有效性。Three-phase converter is usually used to connect the AC and DC subgrids in hybird microgrid. Its control strategy has significant influence on the operating characteristic of whole hybird microgrid. Power balance of hybrid microgrid is guaranteed by utility grid,and DC link voltage is maintained stable by threephase converter in grid-tied mode. Power balance is adjusted by the coordination control system,and AC link voltage is maintained stable by three-phase converter in isolated mode. When the hybrid grid is operated under the varying generation and load conditions,three-phase converter is demanded to transform smoothly in rectifier mode,inverter mode and stop mode. Finally,the feasiblity and validity of the proposed control strategy are verified by simulation.

关 键 词：混合微电网 交 直流子网 双向变换器 协调控制 

分 类 号：TM727[电气工程—电力系统及自动化] TM46