The paper presents a Jacobian smoothing nonlinear complementarity method for solving large nonlinear optimal power flow (OPF) problems. By using (smooth or non-smooth) nonlinear complementarity (NC) functions we reformulate the OPF problem as a (smooth or non-smooth) nonlinear system of equations, which, in turn, can be solved by well-known methods. The Jacobian smoothing method computes the se...

This paper proposes a multiobjective harmony search (MOHS) algorithm for optimal power flow (OPF) problem. OPF problem is formulated as a nonlinear constrained multiobjective optimization problem where different objectives and different constraints have been considered. Fast elitist non dominated sorting and crowding distance have been used to find and manage the Pareto optimal front. Finally, ...

This paper presents three efficient approaches for solving the Optimal Power Flow (OPF) problem using the meta-heuristic algorithms. Mathematically, OPF is formulated as non-linear equality and inequality constrained optimization problem. The main drawback of meta-heuristic algorithm based OPF is the excessive execution time required due to the large number of load flows/power flows needed in t...

Exeoutive Summary Modern computation tools, such as the Optimal Power Flow (OPF) and Automatic Contingency Analysis (ACA), reduce significantly the time required to develop reliable and economical transmission plans. The traditional use of multiple power flows for planning large power systems with complex interconnections is very labor intensive and time consuming and limits the number of optio...

This paper describes a method of assessing the value of controllable devices such as Flexible AC Transmission Systems (FACTS) in a liberalized electricity market. A sophisticated algorithm using ac optimal power flow (OPF) is often unnecessarily detailed for the purpose of valuating such projects. Input parameters such as expected future generation mix is hard to guess and error prone. Therefor...

Our laboratory is currently exploring synthetic oligo(poly(ethylene glycol)fumarate) (OPF)-based biomaterials as a means to deliver fibroblasts to promote regeneration of central/partial defects in tendons and ligaments. In order to further modulate the swelling and degradative characteristics of OPF-based hydrogels, OPF crosslinking via a radically initiated, mixed-mode reaction involving poly...

This paper proposes two novel techniques for including contingencies in OPF-based electricity market computations and for the estimation of a “System-wide” Available Transfer Capability (SATC). The OPF problem formulation includes voltage stability constraints and a loading parameter in order to ensure a proper stability margin for the market solution. Two methods are proposed: The first techni...

We study order-parameter fluctuations (OPF) in disordered systems by considering the behaviour of some recently introduced parameters G,Gc which have proven very useful in locating phase transitions. We prove that both parameters G (for disconnected overlap disorder averages) and Gc (for connected disorder averages) take the respective universal values 3 and 13 31 in the T → 0 limit for any fin...

The genetic algorithm (GA) based solution techniques are found suitable for optimization because of their ability of simultaneous multidimensional search. Many GA-variants have been tried in the past to solve optimal power flow (OPF), one of the nonlinear problems of electric power system. The issues like convergence speed and accuracy of the optimal solution obtained after number of generation...