Alleviation of VAr Impact on Critical Loading Margin with Redispatch in Deregulated Power Systems

 
 
 
  • Abstract
  • Keywords
  • References
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  • Abstract


    The stability management under deregulated environment has become typical task to the system due to random nature of load pattern and generation schedules. In addition, the regular uncertainties in system operation like line outage, generator outage or change in loading level are also causing to change in stability as well as security margins significantly. In order to manage transmission system security, the system operator can go for redispatch as a short term solution. In this article, an attempt is made to clear reactive power loading (VAr) impact on voltage instability margin or Critical Loading Margin (CLM). An Interior Point –Optimal Power Flow (IP-OPF) is applied to make system secured under (N-1) line contingencies. Using this secured schedule, the CLM is computed using Continuous Power Flow (CPF) for the two operating scenarios i.e., without VAr and with VAr loading on the system. The case study is simulated on IEEE 14-bus test network and outcome is validating that, the redispatch can also be apt for CLM enhancement even under contingencies as short term solution for stability management in real time.

     

     


  • Keywords


    Critical Loading Margin; Continuous Power Flow; Deregulation; Interior Point –Optimal Power Flow and Redispatch.

  • References


      [1] P. Kundur, Power system stability and control, McGraw-Hill, Inc, 2007.

      [2] Timothy J. E. Miller, Reactive Power Control in Electric Systems, Wiley– Blackwell, 1983.

      [3] T. Gomez, J. Lumbreas, and V. Parra, “A Security-constrained Decomposition approach to optimal reactive power planning,” IEEE Trans. on Power Systems, August 1991,Vol. 6, pp. 1069-1076,.

      [4] S. Graville and M. Lima, “Application of decomposition techniques to VAR planning: Methodological & Computational Aspects,” IEEE Trans. on Power Systems, Nov. 1994, Vol. 9, pp. 1780-1787.

      [5] V. Ajjarapu, P.L. Lau, S. Battula, “An optimal reactive power planning strategy against voltage collapse”, IEEE Trans. Power System. (1994) 9 (2) 906–917.

      [6] E. Vaahedi et al., “Large scale voltage stability constrained Optimal VAR planning and voltage stability application using existing OPF/Optimal VAR Planning Tools”, IEEE Trans. on Power Systems, Feb 1999,Vol. 14, pp. 65–74,.

      [7] Kumar, Ashwani, S. C. Srivastava, and S. N. Singh. “Congestion management in competitive power market: a bibliographical survey,” Electric Power Systems Research, 2005,Vol. 76, no. 1, pp. 153–164,.

      [8] Momoh, James A., and J. Z. Zhu. “Improved interior point method for OPF problems,” IEEE Transactions on Power Systems, 1999,Vol. 14, no. 3, pp. 1114– 1120,.

      [9] D.P.Kothari, Modern Power System Analysis,

      [10] Ajjarapu, V.; Christy, C., “The continuation power flow: a tool for steady state voltage stability analysis,” IEEE Transactions on Power Systems, Feb 1992, Vol.7, no.1, pp.416–423,.

      [11] C.A. Canizares and F.L. Alvarado, “Point of collapse and continuation methods for large ac–dc systems”, IEEE Transactions on Power Systems, Feb 1993,Vol. 8, no. 1, pp. 1–8,.

      [12] Amjady, Nima, and Masoud Esmaili, “Improving voltage security assessment and ranking vulnerable buses with consideration of power system limits,” International journal of electrical power & energy systems, 2003,Vol. 25, no. 9 pp. 705–715,.

      [13] Ajjarapu, V.; Christy, C., “The continuation power flow: a tool for steady state voltage stability analysis,” IEEE Transactions on Power Systems, Feb 1992, Vol.7, no.1, pp.416–423,.

      [14] Ruipeng, Guo, and Han Zhenxiang. “An improved continuation power flow method for voltage stability analysis,” Automation of Electric Power Systems, 1999, Vol. 14,.

      [15] Alves, Dilson, and Luiz Carlos Da Silva. “Study of alternative schemes for the parameterization step of the continuation power flow method based on physical parameters, part I: Mathematical modeling." Electric Power Components and Systems, 2003, Vol. 31, no. 12, pp. 1151–1166,.

      [16] R. D. Zimmerman, C. E. Murillo–Sanchez, and R. J. Thomas, “MATPOWER: Steady–State Operations, Planning and Analysis Tools for Power System Research and Education,” IEEE Transactions on Power Systems, Feb. 2011, Vol. 26, no. 1, pp. 12–19.


 

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Article ID: 11534
 
DOI: 10.14419/ijet.v7i1.8.11534




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