An optimal under‐frequency load shedding strategy considering distributed generators and load static characteristics

The well-established under-frequency load shedding (UFLS) is deemed to be the last of effective remedial measures against a severe frequency decline of a power system. With the ever-increasing size of power systems and the extensive penetration of distributed generators (DGs) in power systems, the problem of developing an optimal UFLS strategy is facing some new challenges. Given this background, an optimal UFLS strategy for a distribution system with DGs and load static characteristics taken into consideration is developed. Based on the frequency and the rate of change of frequency, the presented strategy consists of several basic rounds and a special round. In the basic round, the frequency emergency can be alleviated by quickly shedding some loads. In the special round, the frequency security can be maintained, and the operating parameters of the distribution system can be optimized by adjusting the output powers of DGs and some loads. The modified IEEE 37-node test feeder is employed to demonstrate the essential features of the developed optimal UFLS strategy in the MATLAB/SIMULINK environment.

[1]  Fred Schweppe,et al.  Homeostatic Utility Control , 1980, IEEE Transactions on Power Apparatus and Systems.

[2]  Y. Halevi,et al.  Optimization of load shedding system , 1993 .

[3]  Adly A. Girgis,et al.  Application of active power sensitivity to frequency and voltage variations on load shedding , 2010 .

[4]  Ding Xu,et al.  Optimal load shedding strategy in power systems with distributed generation , 2001, 2001 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.01CH37194).

[5]  Gerard Ledwich,et al.  Optimal sitting and sizing of distributed generators based on a modified primal-dual interior point algorithm , 2011, 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT).

[6]  Roger L. King,et al.  Using artificial neural networks for load shedding to alleviate overloaded lines , 1994 .

[7]  R. Billinton,et al.  Optimum load-shedding technique to reduce the total customer interruption cost in a distribution system , 2000 .

[8]  Worawat Nakawiro,et al.  Optimal Load Shedding for Voltage Stability Enhancement by Ant Colony Optimization , 2009, 2009 15th International Conference on Intelligent System Applications to Power Systems.

[9]  C. Concordia,et al.  Load shedding on an isolated system , 1995 .

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

[11]  J. Sharma,et al.  Optimum Load Shedding Taking into Account of Voltage and Frequency Characteristics of Loads , 1985, IEEE Transactions on Power Apparatus and Systems.

[12]  P. M. Anderson,et al.  A low-order system frequency response model , 1990 .

[13]  M. Sanaye-Pasand,et al.  A new adaptive multidimensioanal load shedding scheme using genetic algorithm , 2005, Canadian Conference on Electrical and Computer Engineering, 2005..

[14]  Michael J. Barnes,et al.  Using the Analytic Hierarchy Process to Examine Judgment Consistency in a Complex Multiattribute Task , 2010, IEEE Transactions on Systems, Man, and Cybernetics - Part A: Systems and Humans.

[15]  S. Ihara,et al.  Load Representation in Power System Stability Studies , 1982, IEEE Transactions on Power Apparatus and Systems.

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

[17]  Mahdi El Arini.  Optimal dynamic load shedding policy for generation load imbalances including characteristics of loads , 1999 .

[18]  Danny Sutanto,et al.  A new load shedding scheme for limiting underfrequency , 1994 .

[19]  M. Z. El-Sadek,et al.  Optimum load shedding for avoiding steady-state voltage instability , 1999 .

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

[21]  Vladimir Terzija,et al.  Adaptive underfrequency load shedding integrated with a frequency estimation numerical algorithm , 2002 .

[22]  Majid Sanaye-Pasand,et al.  New centralised adaptive load-shedding algorithms to mitigate power system blackouts , 2009 .

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