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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (2): 189-200    DOI: 10.1631/jzus.A0820127
Electrical & Electronic Engineering     
Performance improvement of complementary feeders using static transfer switch system
Tahir MAHMOOD, Mohammad Ahmad CHOUDHRY
Department of Electrical Engineering, University of Engineering and Technology, Taxila 47050, Pakistan
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Abstract  The performance of complementary feeders, running in parallel, can be significantly improved by installing static transfer switches (STSs) at critical locations. We develop the STS control logic, which transfers the critical load from the preferred feeder to the alternate feeder when a voltage sag or a fault occurs on the preferred feeder. A forced commutation technique is proposed and implemented to turn off the preferred feeders’ thyristor, thus avoiding cross current to flow and minimizing the transfer time. Simulation results show that the forced commutation technique is more effective as compared to the recently proposed time delay technique for STS operation. Two different feeders, namely New Exchange, the preferred feeder, and Sector I-10/2, the alternate feeder of Islamabad Electric Supply COmpany (IESCO), Pakistan, have been selected for case studies. The software PSCAD/EMTDC professional package has been used for simulation.

Key wordsComplementary feeder      Cross current      Static transfer switch (STS)      Sensitive load      Voltage sag      PSCAD/EMTDC     
Received: 21 February 2008     
CLC:  TM761  
  TM712  
Cite this article:

Tahir MAHMOOD, Mohammad Ahmad CHOUDHRY. Performance improvement of complementary feeders using static transfer switch system. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(2): 189-200.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820127     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I2/189

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