Showing papers by "Robert J. Thomas published in 1985"
01 Dec 1985
TL;DR: In this paper, the authors explore the relationship between the actual domain of attraction of the swing equations of electric power systems and that of the associated gradient system and propose a directly implementable on-line test for instability.
Abstract: This paper explores the relationship between the actual domain of attraction of the swing equations of electric power systems and that of the associated gradient system. A directly implementable on-line test for instability is proposed together with an iterative method guaranteed to improve estimates of the domain of attraction.
13 citations
TL;DR: The new Kettering Energy-Systems Laboratory at Cornell University is described and its functions as a unique electric-power research tool and as an important power-field educational adjunct are discussed as discussed by the authors.
Abstract: The new Kettering Energy-Systems Laboratory at Cornell University is described and its functions as a unique electric-power research tool and as an important power-field educational adjunct are discussed. The individual laboratory components and their functions are discussed. These components include both software and real-time hardware simulation tools. Use of the Laboratory in current educational activities is outlined. Possibilities for future development of the facility are examined.
10 citations
TL;DR: In this article, a control strategy for an AC/DC/AC interface to smooth or limit wind farm output is investigated, and an optimal level to which the wind output should be limited is found in terms of the distribution of wind power output and the relative cost of the fast acting and base loaded units.
Abstract: A control strategy for an AC/DC/AC interface to smooth or limit wind farm output is investigated. The need to follow rapid power variation from uncontrolled wind farms with expensive gas turbines limits the amount of penetration of wind energy systems in existing utilities. An AC/DC/AC interface makes it possible to limit the power variations from the wind farm. An optimal level to which the wind output should be limited is found in terms of the distribution of wind power output and the relative cost of the fast acting and base loaded units. Using the optimal cutting point for the wind output each wind farm can be included in the economic dispatch calculation. The economic advantage of limiting wind power output is demonstrated on an example system. Using a hypothetical system it is shown that wind penetrations as high as 16.75% may be economical using the optimal strategy made possible by the AC/DC/AC interface.
9 citations