Optimal reactive power dispatch using hybrid Nelder–Mead simplex based firefly algorithm

•A new hybrid algorithm combining Nelder–Mead simplex and Firefly Algorithm (FA) is proposed.•The premature convergence of FA is improved with better exploitation of NM simplex.•The superiority of the new method is demonstrated in solving power system ORPD problems.•Simulation results obtained by th...

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Bibliographic Details
Published in:International journal of electrical power & energy systems Vol. 66; pp. 9 - 24
Main Authors: Rajan, Abhishek, Malakar, T.
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.03.2015
Subjects:
Algorithms
Electric potential
Electric power generation
Firefly algorithm
Heuristic methods
Hybrid algorithm
Matlab
Nelder–Mead simplex search method
Optimal reactive power dispatch
Optimization
Reactive power
Voltage
Nelder–Mead simplex search method
Optimal reactive power dispatch
Firefly algorithm
Hybrid algorithm
ISSN:0142-0615, 1879-3517
Online Access:Get full text
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Summary:•A new hybrid algorithm combining Nelder–Mead simplex and Firefly Algorithm (FA) is proposed.•The premature convergence of FA is improved with better exploitation of NM simplex.•The superiority of the new method is demonstrated in solving power system ORPD problems.•Simulation results obtained by the proposed method are compared with other methods.•The advantage of this new method is its robustness with better convergence characteristics. This paper presents a novel hybrid algorithm combining Firefly Algorithm (FA) and Nelder Mead (NM) simplex method for solving power system Optimal Reactive Power Dispatch (ORPD) problems. The ORPD is a very important aspect of power system operation and is a highly nonlinear, non-convex optimization problem, consisting of both continuous and discrete control variables. Like many other general purpose optimization methods, the original FA often traps into local optima and in order to overcome the shortcoming, in this paper, an efficient local search method called NM simplex subroutine is introduced in the internal architecture of the original FA algorithm. The proposed Hybrid Firefly Algorithm (HFA) avoids premature convergence of original FA by exploration with FA and exploitation with NM simplex. The proposed method is applied to determine optimal settings of generator voltages, tap positions of tap changing transformers and VAR output of shunt capacitors to optimize two different objective functions; such as minimization of real power loss and voltage deviations. The program is developed in Matlab and the proposed hybrid algorithm is examined on two standard IEEE test systems for solving the ORPD problems. For validation purpose, the results obtained with the proposed approach are compared with those obtained by other methods. It is observed that the proposed method has better convergence characteristics and robustness compared to the original version of FA and other existing methods. It is revealed that the proposed hybrid method is able to provide better solutions.
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ISSN:0142-0615
1879-3517
DOI:10.1016/j.ijepes.2014.10.041