Underfrequency Load Shedding for an Islanded Distribution System With Distributed Generators

Significant penetration of distributed generation in many distribution systems has opened an option of operating distribution systems in island mode for economical and technical reasons. However, balancing frequency of the islanded system is still an issue to be solved, especially when the demand exceeds the generation in the power island. This paper presents a strategy to shed an optimal number of loads in the island to stabilize the frequency. The load shedding strategy is based on frequency information, rate of change of frequency, customers' willingness to pay, and loads histories. Different scenarios have been simulated with results showing that the proposed method is effective in shedding the optimal number of loads while stabilizing frequency.

[1]  Surya Santoso,et al.  Fundamental time–domain wind turbine models for wind power studies , 2007 .

[2]  Mauridhi Hery Purnomo,et al.  Adaptive load shedding of the power system based on neural network , 2002, 2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering. TENCOM '02. Proceedings..

[3]  J. Mutale,et al.  Taking an active approach , 2007, IEEE Power and Energy Magazine.

[4]  Wang Xin.  A new load shedding scheme for limiting underfrequency , 2002 .

[5]  Vladimir Terzija.  Adaptive underfrequency load shedding based on the magnitude of the disturbance estimation , 2006 .

[6]  D. McInnis,et al.  Fast acting load shedding , 1991, [Proceedings] Conference Papers 1991 Power Industry Computer Application Conference.

[7]  Wenyuan Li,et al.  A New Under-Frequency Load Shedding Scheme Considering Load Frequency Characteristics , 2006, 2006 International Conference on Power System Technology.

[8]  Zhe Chen,et al.  A hybrid islanding detection technique using average rate of voltage change and real power shift , 2009, 2009 IEEE Power & Energy Society General Meeting.

[9]  M. Parniani,et al.  SCADA based under frequency load shedding integrated with rate of frequency decline , 2006, 2006 IEEE Power Engineering Society General Meeting.

[10]  S. S. Venkata,et al.  An adaptive approach to load shedding and spinning reserve control during underfrequency conditions , 1996 .

[11]  V. Terzija,et al.  Adaptive underfrequency load shedding based on the magnitude of the disturbance estimation , 2006, IEEE Transactions on Power Systems.

[12]  P. M. Anderson,et al.  An adaptive method for setting underfrequency load shedding relays , 1992 .

[13]  Jin Zhong,et al.  UFLS Design by Using f and Integrating df/dt , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[14]  Peter Martinsson,et al.  Willingness to Pay among Swedish Households to Avoid Power Outages: A Random Parameter Tobit Model Approach , 2007 .

[15]  Shyh-Jier Huang,et al.  An adaptive load shedding method with time-based design for isolated power systems , 2000 .

[16]  B. Fox,et al.  Adaptive load shedding for isolated power systems , 1994 .