适用于交直流混合微电网的直流分层控制系统  

DC Hierarchical Control System for Microgrid Applications

作　　者：陆晓楠[1] 孙凯[1] Josep Guerrero 黄立培[1] 

机构地区：[1]清华大学电力系统及大型发电设备安全控制和仿真国家重点实验室,北京100084 [2]丹麦奥尔堡大学能源技术系

出　　处：《电工技术学报》2013年第4期35-42,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51177083)

摘　　要：为了改进交直流混合微电网中直流侧的母线电压性能,本文提出了直流分层控制系统,以在各接口变换器之间合理分配直流负荷,同时补偿下垂控制带来的直流母线电压跌落。所介绍的分层控制系统包括两层:第一层控制直流母线电压和交流电流,同时通过下垂控制实现直流侧的负荷功率分配;第二层补偿下垂控制带来的电压跌落,进一步提升母线电压质量。在第二层控制中,采用了具有低带宽通信特点的公共控制器,满足了微电网分布式结构的需要。本文给出了各控制层的具体设计方法。同时,对第二层控制的低带宽通信特性进行了具体的理论分析。仿真和实验结果表明了理论分析的正确性。In order to enhance the DC side performance of AC-DC hybrid microgrid, a DC hierarchical control system is proposed in this paper. To meet the requirement of DC load sharing between the parallel power interfaces, droop method is adopted. Meanwhile, DC voltage secondary control is employed to restore the deviation in the DC bus voltage. The hierarchical control system is composed of two levels. DC voltage and AC current controllers are achieved in the primary control level. At the same time, droop method for DC side is adopted to reach load sharing. Secondary control level is employed to restore the deviation caused by droop control. Common PI controller with low bandwidth communication is used in the secondary control level, which meets the requirement of the distributed characteristic in the microgrid system. In this paper, the detailed design method for each control level is introduced. Theoretical analysis of the low bandwidth characteristic of secondary control level is also realized. Theoretical results are validated by both simulation and experiment.

关 键 词：混合微电网 并联接口变换器 分层控制 下重控制 

分 类 号：TM727[电气工程—电力系统及自动化]