含多虚拟同步发电机的微电网二次调频策略  

Secondary Frequency Regulation Strategy in Microgrid Based on VSG

作　　者：涂春鸣[1] 杨义[1] 兰征[1] 肖凡[1] 李元涛 Tu Chunming;Yang Yi;Lan Zheng;Xiao Fan;Li Yuantao(National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),长沙410082

出　　处：《电工技术学报》2018年第10期2186-2195,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51577055)

摘　　要：针对微电网低惯性特性使得其频率易受负荷波动影响而偏移出额定值的问题,提出一种基于虚拟同步发电机(VSG)的二次调频方法。首先,在分析电力系统调频原理的基础上,提出了在VSG功频控制中引入二次调频控制器来实现频率的无差控制。其次,针对含多个VSG并联运行且都参与二次调频的情况,通过对二次调频控制环节进行改进,使VSG不需要借助于微电网中央控制器间的协调控制,即可实现无差调频。同时,该策略的提出使得VSG能够根据自身额定容量自主分配负荷功率,提高了微电网经济运行能力。最后,仿真结果和实验结论验证了所提理论分析的正确性和实用性,所提方法可有效地改善微电网的频率特性和经济运行特性。Due to the low inertia characteristic of microgrid, its frequency is susceptible to load fluctuation and deviates from rated value. Thus, a strategy of secondary frequency regulation based on virtual synchronous generator is presented. Firstly, according to the analysis of the frequency regulation principle of power system, the secondary frequency regulation controller of VSG is introduced in active power-frequency control to realize the frequent deviation-free control. Additionally, VSGs that are involved in the secondary frequency regulation can achieve no difference frequency regulation by improving the secondary frequency regulation control link in microgrid. The whole process does not rely on the coordinated control of microgrid central controller. Meanwhile, the proposed strategy allows VSG to allocate load power according to its own rated capacity, and improves the economic operation capability of microgrid. Finally, the proposed control method is verified by simulations and experiments. The proposed method effectively improves the frequency and economic operation characteristic of the microgrid.

关 键 词：微电网 虚拟同步发电机 功率分配 二次调频 

分 类 号：TM464[电气工程—电器]