Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (12): 70-74.doi: 10.3969/j.issn.1000-565X.2013.12.012

• Power & Electrical Engineering • Previous Articles     Next Articles

Relay Protection Scheme for Power Distribution Network with Distributed Generations

Liao Zhi- wei1 Lan Peng- hao1 Cui Fa- ju1 Chen Kai2 Liu Yi- jie2   

  1. 1.School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China;2.Zhanjiang Electric Power Bureau of Guangdong Power Grid Corporation,Zhanjiang 524005,Guangdong,China
  • Received:2013-05-10 Revised:2013-10-14 Online:2013-12-25 Published:2013-11-19
  • Contact: 廖志伟(1973-)，男，副教授，主要从事电力系统故障诊断、分析以及电力系统智能控制研究． E-mail:epliao@scut.edu.cn
  • About author:廖志伟(1973-)，男，副教授，主要从事电力系统故障诊断、分析以及电力系统智能控制研究．
  • Supported by:

    国家自然科学基金资助项目(51077056);华南理工大学中央高校基本科研业务专项资金资助项目(2011ZM0020)

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Abstract:

With the interconnection of distributed generations (DGs),the network structure and fault current ofpower distribution system are changed,which leads to the mis- operation,malfunction and sensitivity degradation ofprotective relays.In order to quickly clear the fault region and well play a supporting role of DGs for the system,anew protection scheme is introduced based on the traditional relay protection scheme of power distribution system.In the proposed scheme,the directional pilot protection is adopted and a acceleration module,a direction module,a voltage detection module and an inverse time over- current protection module are employed to avoid the fault currentthat cannot be eliminated due to the protection and the breaker malfunction.Simulated results of PSCAD/EMTDCon a 10kV power distribution system with DGs verify the effectiveness of the proposed scheme.

Key words: power distribution system, distributed generation, relay protection