Optimal allocation and sizing of DG units considering voltage stability,losses and load variations |
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Affiliation: | 1. Power Distribution Research Department, China Electric Power Research Institute, Beijing 100192, China;2. China North Vehicle Research Institute, Beijing 100072, China;1. College of Information and Electrical Engineering, China Agricultural University, Beijing 100083, China;2. College of Information Science & Technology, Agricultural University of Hebei, Baoding 071000, China |
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Abstract: | This paper proposes a new index to determine the optimal size and location of DG units, in order to minimize active power losses and enhance voltage stability margin considering load variations. A modified form of Imperialistic Competitive Algorithm (ICA) method is used to solve the optimization problem. To provide a comprehensive perspective for network scheduling, the load variations are considered. The load linear changes are from 50% to 150% of the base load (in 1% steps). At each step, the optimal size and location of the DG unit are determined and then, general expressions for DG sizes as a function of load level are concluded through curve fitting technique. These general expressions can be used as a suitable tool for network planning.The proposed method is applied to 34-bus and 69-bus test systems and the results are compared with the results obtained from cuckoo search algorithm in order to validate the proposed methodology. |
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Keywords: | DG location and size Imperialistic Competitive Algorithm (ICA) Voltage stability index Voltage stability margin Active power losses minimization Cuckoo search |
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