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Volume 13, Issue 2 2012 Article 2 International Journal of Emerging Electric Power Systems Transient Stability Constrained Line-Flow- Based Optimal Power Flow Analysis Lazarus O. Uzoechi, Tennessee Technological University Satish M. Mahajan, Tennessee Technological University Ghadir Radman, Tennessee Technological University Recommended Citation: Uzoechi, Lazarus O.; Mahajan, Satish M.; and Radman, Ghadir (2012) "Transient Stability Constrained Line-Flow-Based Optimal Power Flow Analysis," International Journal of Emerging Electric Power Systems: Vol. 13: Iss. 2

1 Introduction Power system stability, especially transient stability, has increasingly become an area of concern from the early days of operation as power systems over large geographical areas are interconnected using a complex array of devices. Moreover, as they exhibit continuously changing behaviors due to changes in loads or external disturbances, it is essential to balance the overall system operation against these changes so that power system stability is maintained. In such situations, it is essential to settle a power system to either its original or new

1 Introduction The terminal voltage regulation and the transient stability enhancement are the two main issues on the excitation control of generators in power systems [ 1 ]. The terminal voltage regulator focuses on maintaining the voltage at a normal level or regulating the voltage to the reference value. The transient stability issue concerns about guaranteeing the synchronization of the generators and damping the system oscillations when faults happen. For an excellent excitation controller, it should be helpful to improve the system stability during the

, A. Bose, C. Canizares, N. Hatziargyriou, D. Hill, A. Stankovic, C. Taylor, T. V. Cutsem and V. Vittal, “Definition and Classification of Power System Stability”, IEEE Transactions on Power Systems , vol. 19, no. 2, pp. 1387-1401, 2004. [4] N. Amjady and S. F. Majedi, “Transient stability prediction by a hybrid intelligent system”, IEEE Transaction on Power Systems , vol. 22, no.3, pp. 1275 - 1283, 2007. [5] D. R. Gurusinghe and A. D. Rajapakse, “Post-Disturbance Transient Stability Status Prediction Using Synchrophasor Measurements”, IEEE Transactions on Power

increased very rapidly. It has grown to 47.317 GW from about 3.5 GW in the year 1994.The global wind power industry installed in 2004 was 7976 MW, an increase in the total installed generating capacity of 20 %. In wind power stations, the induction generators are commonly used due to variable speed nature. Since, induction generators have a stability problem like synchronous machines, it is important to analyze the transient stability (TS) of a power system including the wind energy generators. Pitch angle control is needed in conditions above the rated wind speed when

Volume 13, Issue 3 2012 Article 3 International Journal of Emerging Electric Power Systems A Transient Stability Constrained, Line-Flow- Based Fast Contingency Screening and Power Flow Evaluation Lazarus O. Uzoechi, Tennessee Technological University Satish M. Mahajan, Tennessee Technological University Recommended Citation: Uzoechi, Lazarus O. and Mahajan, Satish M. (2012) "A Transient Stability Constrained, Line- Flow-Based Fast Contingency Screening and Power Flow Evaluation," International Journal of Emerging Electric Power Systems: Vol. 13: Iss. 3, Article 3

Volume 7, Issue 1 2006 Article 6 International Journal of Emerging Electric Power Systems Modelling of TCSC Controller for Transient Stability Enhancement Ramnarayan Patel, IIT Roorkee Vasundhara Mahajan, IIT Roorkee Vinay Pant, IIT Roorkee Recommended Citation: Patel, Ramnarayan; Mahajan, Vasundhara; and Pant, Vinay (2006) "Modelling of TCSC Controller for Transient Stability Enhancement," International Journal of Emerging Electric Power Systems: Vol. 7: Iss. 1, Article 6. DOI: 10.2202/1553-779X.1288 Modelling of TCSC Controller for Transient Stability

add damping to the generator rotor oscillations; however, the voltage modes cannot be stabilised using a PSS [ 4 ]. Generators equipped with a PSS and an automatic voltage regulator (AVR) can enhance voltage as well as transient stability of power systems. North American Reliability Council and Western Electric Coordinating Council are ruling that machines rated more than 35 MV A or group of machines equal to or more than 75 MV A connected to the transmission grid through one transformer must operate in voltage regulating mode and be equipped with PSSs to improve

1 Introduction As the years passed, the demand for electric power grew exponentially and has led to increased stress levels on transmission power systems. From this, problems rose that include transient disturbances thus, leading to network instability. Transient stability is defined as the ability to keep a power system in synchronism after a large disturbance occurred in a power system. There are many major disturbances in a power system, namely: i) loss of transformers, ii) loss of load, iii) loss of generation and iv) overhead line or cable faults, etc [ 1

Volume 8, Issue 1 2007 Article 4 International Journal of Emerging Electric Power Systems Application of Trajectory Sensitivity for the Evaluation of the Effect of TCSC Placement on Transient Stability Dheeman Chatterjee, Indian Institute of Technology Kanpur Arindam Ghosh, Queensland University of Technology Recommended Citation: Chatterjee, Dheeman and Ghosh, Arindam (2007) "Application of Trajectory Sensitivity for the Evaluation of the Effect of TCSC Placement on Transient Stability," International Journal of Emerging Electric Power Systems: Vol. 8: Iss. 1