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August 2007, Sept. 2007, Oct. 2007, Nov. 2007, Dec. 2007,

Issue 8, Volume 2, August 2007
Print ISSN: 1790-5060
E-ISSN: 2224-350X








Title of the Paper:  Effective Optimal Power Flow Solution with Transient Stability Constraints based on Functional Transformation Technique


Authors: Hiromu Hamada, Marta Marmiroli, Junji Kubokawa, Ryuichi Yokoyama

Abstract: Optimal power flow with transient stability constraints (OTS) can coordinate the economical efficiency, reliability and quality of the electric power at the same time. However, OTS is a nonlinear infinite optimization problem, which is difficult to be solved precisely even for power systems of small dimension. In this paper, we propose a new transformation method, which exactly converts the infinite-dimension OTS into a finite-dimension optimization problem. The transformed OTS problem has the same variables of the associated OPF problem, and is tractable even for the large-scale power systems with a large number of transient stability constraints. In addition, this paper uses a modified SQP (sequential quadratic programming) approach to solve the formulated nonlinear optimization problem. By using this approach, the optimal operation points can be determined in short calculation time.

Keywords: Transient stability, Optimal power flow, Sequential quadratic programming, Power system, Functional equality, Available transfer capability.

Title of the Paper: A New Power Flow Model Incorporating Effects of Automatic Controllers


Authors: Jagabondhu Hazra and Avinash Kumar Sinha

Abstract: This paper presents a modified fast decoupled load flow method which incorporates voltage and frequency dependent characteristics of loads, generatorís regulation characteristics and sensitivity based automatic transformer tap adjustment scheme. The proposed method is suitable for analysis of large power systems in the normal as well as abnormal conditions such as major contingencies involving line outage, generator and/or load loss, system islanding etc. The proposed method is tested on IEEE test systems and an Indian system. Simulation results are presented to show the characteristics of the proposed method.

Keywords: Load flow, load characteristics, regulation characteristics, tap adjustment

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