电工技术学报  2018, Vol. 33 Issue (3): 581-590    DOI: 10.19595/j.cnki.1000-6753.tces.161868
电力系统 |
基于虚拟阻抗的恒压恒频微电源的故障控制策略
李松峰, 牟龙华, 郭文明, 张鑫
同济大学电气工程系 上海 201804
Fault Control Strategy of U/f Controlled Micro Sources Based on Virtual Impedance
Li Songfeng, Mu Longhua, Guo Wenming, Zhang Xin
Department of Electrical Engineering Tongji University Shanghai 201804 China
全文: PDF (1895 KB)  
输出: BibTeX | EndNote (RIS)      
摘要 微电网孤岛运行时,恒压恒频控制模式的逆变型分布式电源(DG)支撑整个网络的电压与频率,其控制策略对微电网的故障穿越能力具有重要影响。该文采用虚拟阻抗法设计了U/f-DG的故障控制策略,分析了基于虚拟阻抗的逆变型DG控制原理,并推导出DG在正、负序网络下的等效模型,设计了故障情况下DG的限流算法。考虑到U/f-DG对并网点电压的支撑效果,提出了一种虚拟阻抗阻感比的设计方法,使不对称故障时并网点电压不平衡度最小化。并提出一种U/f-DG与从属DG的协调控制策略,使得微电网平稳度过故障暂态阶段。最后,Simulink算例仿真验证了所提故障控制策略的有效性。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
李松峰
牟龙华
郭文明
张鑫
关键词 逆变型分布式电源恒压恒频控制虚拟阻抗故障控制策略    
Abstract:U/f controlled inverter-based distributed generator (U/f-DG) supports the grid voltage and frequency in islanded microgrid, thus its control strategy has a significant influence on fault ride-through capability of microgrid. In this paper, a fault control strategy of U/f-DG is designed by introducing virtual impedance. Control principle of U/f-DG based on virtual impedance is briefly analyzed, and its equivalent positive and negative sequence model is deduced. Current limiting algorithm of U/f-DG under fault condition is also proposed. Considering voltage support, a design method of virtual impedance R/X ratio is proposed to minimize the voltage unbalance factor under unsymmetrical fault condition. A coordinated control strategy for U/f-DG and the subordinate DGs is presented to ensure that microgrid goes through the transient period smoothly. Finally, the validity of the proposed fault control strategy is verified by Simulink simulation software.
Key wordsInverter-based DG    U/f control    virtual impedance    fault control strategy   
收稿日期: 2016-11-28      出版日期: 2018-02-26
PACS: TM711  
基金资助:国家重点基础研究发展计划(973计划)(2014CB249201)资助项目
通讯作者: 牟龙华 男,1963年生,教授,博士生导师,研究方向为电力系统继电保护、分布式发电与微电网、电能质量。E-mail:lhmu@tongji.edu.cn   
作者简介: 李松峰 男,1993年生,硕士研究生,研究方向为微电网控制与保护。E-mail:lisongfeng1993@163.com
引用本文:   
李松峰, 牟龙华, 郭文明, 张鑫. 基于虚拟阻抗的恒压恒频微电源的故障控制策略[J]. 电工技术学报, 2018, 33(3): 581-590. Li Songfeng, Mu Longhua, Guo Wenming, Zhang Xin. Fault Control Strategy of U/f Controlled Micro Sources Based on Virtual Impedance. Transactions of China Electrotechnical Society, 2018, 33(3): 581-590.
链接本文:  
https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.161868          https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I3/581