Naoto Yorino

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This paper presents a new approach to treat reactive power (VAr) planning problem using multi-objective evolutionary algorithms. Specifically, Strength Pareto Evolutionary Algorithm (SPEA) and Multi-Objective Particle Swarm Optimization (MOPSO) approaches have been developed and successfully applied. The overall problem is formulated as a nonlinear(More)
This paper proposes a new method for transient stability analysis for electric power systems. Different from existing methods, a minimization problem is formulated for obtaining critical conditions for transient stability. The method is based on the computation of a trajectory on the stability boundary, which is referred to as critical trajectory in this(More)
This paper investigates the applicability and effectiveness of modern heuristic techniques for solving SVC placement problem. Specifically, Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Evolutionary PSO (EPSO) have been developed and successfully applied to find the optimal placement of SVC devices. The main objective of the proposed problem(More)
The rapid growth in the electricity demand and expansion of renewable energy (RE) generation are presenting serious challenges for the optimal network operation. The future perspective of the dramatic increase in renewable generation, such as wind and solar energy will lead to severe problems related to the load dispatch. Power system security is threatened(More)
This paper presents a competitive bidding scheme for procuring VAR service in the electricity market with the consideration of voltage security in normal and postcontingency states. To determine the most beneficial VAR contracts that satisfy the required level of system security and ensure adequate payment of VAR service, an optimization problem that(More)
This paper proposes a method for transient stability analysis for multi-machine electric power systems. Different from existing methods, a minimization problem with boundary values is formulated for obtaining critical conditions for transient stability, where a new numerical integration method is developed by modifying the trapezoidal formula to solve(More)
This paper proposes a new framework for distribution network planning, in order to obtain the maximum merit of utilities and customers under the condition of mass installed Distributed Generators (DGs). In this study, an objective function including ancillary service charge for cogeneration systems is formulated to obtain maximum profits of customers, and(More)