Capacitor Allocation in Radial Distribution System with Time Varying ZIP Load Model and Energy Savings

Abstract In this paper, novel method based on loss sensitivity approach is utilized to determine optimal locations and size of the capacitors in radial distribution system to reduce power losses and improve voltage profile. Reduction in power loss enhances energy efficiency in distribution system also releases feeder capacity. Distribution system has combination of different type of loads (Industrial, commercial and Residential). Load models have significant impact on selecting capacitor size for better deployment of reactive power support. The main contribution of the paper is: (i) Capacitor allocation for radial distribution network using sensitivity approach, (ii) capacitor allocation and sizes calculation for radial distribution system with load growth and winter load variations, (iii) comparison of the results obtained with single and multi-capacitors placement with load growth and load variations, (iv) The loss savings and overall cost savings per annum with capacitors placement. In this paper we considered the impact of time varying load flow with realistic load model. The load growth factor is considered in the study which is essential for the planning and expansion of the existing systems. The impact of the realistic load model as ZIP load model has been considered for study of the systems. The results have been obtained for the distribution network of UK Distribution Corporation consisting of 38 buses.

[1]  J. Grainger,et al.  Optimum Size and Location of Shunt Capacitors for Reduction of Losses on Distribution Feeders , 1981, IEEE Transactions on Power Apparatus and Systems.

[2]  Jin-Cheng Wang,et al.  Optimal capacitor placements in distribution systems. I. A new formulation and the overall problem , 1990 .

[3]  Mohammed H. Haque,et al.  Load flow solution of distribution systems with voltage dependent load models , 1996 .

[4]  M.M. Hamada,et al.  A proposed strategy for capacitor allocation in radial distribution feeders , 2008, 2008 12th International Middle-East Power System Conference.

[5]  J. J. Grainger,et al.  Capacity Release by Shunt Capacitor Placement on Distribution Feeders: A New Voltage-Dependent Model , 1982, IEEE Power Engineering Review.

[6]  Claudio A. Canizares,et al.  Distribution System Voltage Regulation and Var Compensation for Different Static Load Models , 2000 .

[7]  D. Das,et al.  Simple and efficient method for load flow solution of radial distribution networks , 1995 .

[8]  Mohammed H. Haque.  Capacitor placement in radial distribution systems for loss reduction , 1999 .

[9]  J. Teng.  A direct approach for distribution system load flow solutions , 2003 .

[10]  Jin-Cheng Wang,et al.  Optimal capacitor placements in distribution systems. II. Solution algorithms and numerical results , 1990 .

[11]  Anil Pahwa,et al.  Optimal selection of capacitors for radial distribution systems using a genetic algorithm , 1994 .

[12]  J. Grainger,et al.  Optimum Placement of Fixed and Switched Capacitors on Primary Distribution Feeders , 1981, IEEE Transactions on Power Apparatus and Systems.