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It is an important but challenging issue to represent a wind farm using an equivalent model. This paper tries to develop an equivalent representation of a wind farm for power system planning and operation studies using Thevenin equivalent circuit. In the paper, a series string configuration of wind farms with doubly-fed induction generator (DFIG) wind turbines is emphasized, and case studies have...
This paper presents a two-step modified priority list (MPL) based mixed integer linear programming (MILP) method for improving the computational speed of unit commitment (UC) programs while preserving optimality. In the first step, the heuristics of UC results for a given generation fleet are investigated to develop the MPL. A subset of the generators are determined to be online (committed) or offline...
The input resistance of CMOS circuits is a measurable limit on the performance of typical static CMOS logic gates. A survey of measured data from five generations of CMOS technology including polysilicon oxynitride gate first stacks (P-SiON), high K metal gate first stacks (GF), and high K replacement metal gate stacks (RMG) shows a trend of increasing gate resistance. We show DC and RF measurements...
Energy storage is an essential element of future power systems to integrate high level of variable renewable energy resources. Earlier studies have found that energy storage can compensate for the stochastic nature of intermittent energy sources by absorbing the excessive energy when generation exceeds predicted levels and providing it back to the grid when generation levels fall short. However, earlier...
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