Journal of Electrical Engineering : Volume 17 / 2017 - Edition : 1

PLANNING OF UNBALANCED RADIAL DISTRIBUTION SYSTEMS WITH CAPACITOR USING DIFFERENTIAL EVOLUTION ALGORITHM

Authors:
Padarbinda Samal
Sanjeeb Mohanty
Sanjib Ganguly
Domain:
industrial electrical power systems
Abstract:
This work presents a planning approach for unbalanced radial distribution systems using differential evolution (DE) algorithm so as to determine the optimal capacitor location and phase balancing. Four objective functions are considered in the planning problem. They are the minimization of (i) total system real power loss, (ii) average voltage drop, (iii) total neutral current, and (iv) total negative-sequence voltage unbalance. These objectives are optimized under the constraints of minimum and maximum voltage limits for each bus voltage and thermal limit of each line. A modified three phase forward-backward sweep based load flow algorithm is employed as a supplementary tool for the evaluation of these objective functions. The simulation results obtained with the Indian 19-bus and 34-bus unbalanced radial distribution networks show that significant improvement in power loss, average voltage drop, and total neutral current can be achieved with simultaneous optimization for capacitor location, sizing and phase balancing.
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