Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (12): 56-62,69.doi: 10.3969/j.issn.1000-565X.2013.12.010

• Power & Electrical Engineering • Previous Articles     Next Articles

Small- Signal Stability Analysis of Micro- Grid with Inverters Employing Droop Control

Xu Qing- shan1 Sun Yin1 Ding Mao- sheng2 Li Qiang3 Xin Jian- bo4 Xu Qing- qiang3   

  1. 1.School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu,China; 2.Ningxia Electric PowerCompany of State Grid,Yinchuan 750001,Ningxia,China; 3.Jiangsu Electric Power Company of State Grid,Nanjing 210024,Jiangsu,China; 4.Jiangxi Electric Power Research Institute,Nanchang 330006,Jiangxi,China
  • Received:2013-08-09 Revised:2013-10-10 Online:2013-12-25 Published:2013-11-19
  • Contact: 徐青山(1979-)，男，教授，博士生导师，主要从事新能源发电及微电网运行与控制研究． E-mail:xuqingshan@seu.edu.cn
  • About author:徐青山(1979-)，男，教授，博士生导师，主要从事新能源发电及微电网运行与控制研究．
  • Supported by:

    国家 “十二五” 科技支撑计划项目(2013BAA01B00);国家自然科学基金资助项目(51377021);国家电网公司科技项目(52182013000V);江苏省电力公司科技项目(J2013073)

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Abstract:

Due to the particularity of distributed generators and loads,system stability has become an important fac-tor that restricts the development of micro- grid.In order to implement the small- signal stability of micro- grid duringthe isolated island operation when several inverters participate in the system voltage and frequency control,a small-signal model of micro- grid containing inverters with P- f and Q- V droop control,which takes into consideration thedynamic characteristics of the controller and the network,is established.Then,the model is used to calculate thesystem eigenvalues and analyze the small- signal stability of micro- grid intuitively,with its effectiveness being alsoverified.Moreover,the variation of engenvalues with the system parameters are discussed,and the parameter par-ticipation factors are calculated and are used as the measurement indexes for the optimization design of controllerparameters.The research provides a foundation for the stability improvement of micro- grid.

Key words: micro- grid, droop control, small- signal stability, eigenvalue analysis