Abstract-In this paper, a newmethodology, calledRiverprogression algorithm (RPA) used for solving reactive power problem. The strategy of the RPA as an optimization algorithm was an derivative from nature & after examining the whole riverprogression process which involves the flow of streams and rivers into the sea in the natural world.The proposed River progression algorithm (RPA) has been tested in standard IEEE 30 bus test system and simulation results shows clearly about the superior performance of the proposed algorithm in dropping the real power loss.Key words -Nature-inspired algorithm, Reactive Power, Transmission loss, voltage stability,RiverProgression Algorithm
I. INTRODUCTIONThe main objective of reactive power dispatchproblem is to minimize the real power loss and bus voltage deviation by fulfilling a set of physical and working constraints imposed by apparatus limitations and security needs. Various mathematical techniqueslike the gradient method [1-2], Newton method [3] and linear programming [4][5][6][7] have been adopted to solve the optimal reactive power dispatch problem. Both the gradient and Newton methods has the difficulty in overseeing inequality constraints. If linear programming is applied then the input-output function has to be articulated as a set of linear functions which mostly lead to loss of correctness. The problem of voltage stability and collapse play a major role in power system planning and operation [8]. Global optimization has received extensive research alertness, and a great number of methods have been applied to solve this problem. Evolutionary algorithms such as PSO &genetic algorithm have been already designed to solve the reactive power flow problem [9,10].Evolutionary algorithm is a heuristic approach used for minimization problems by utilizing nonlinear and non-differentiable continuous space functions. In [11], Genetic algorithm has been used to solve optimal reactive power flow problem. In [12], Hybrid differential evolution algorithm is proposed to improve the voltage stability index. In [13] Biogeography Based algorithm is considered to solve the reactive power dispatch problem. In [14], afuzzy based method is used to solve the optimal reactive power scheduling method .In [15],an improved evolutionary programming is used to solvethe optimal reactive power dispatch problem. In [16], the optimal reactive power flow problem is solved by integrating a genetic algorithm with a nonlinearinterior point method. In [17], apattern algorithm is used to solve ac-dc optimal reactive powerflow model with the generator capability limits. In [18], proposes a two-step approach to evaluate Reactive power reserves with respect to operating constraints and voltage stability. In [19], a programming based proposed approach used to solve the optimal reactive power dispatch problem. In [20], presents aprobabilistic algorithm for optimal reactive power provisionin hybrid electricity markets with uncertain loads.In this work, a new optimization algorithm, recognized as the riverprogress...