A unified approach to transient stability contingency filtering, ranking and assessment (original) (raw)
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This thesis would not have been possible without the guidance and help of several individuals who in one way or another contributed and extended their valuable assistance in the preparation and completion of this study. First and foremost, I would like to express my utmost gratitude to my advisor, Professor Parviz Rastgoufard for his valuable guidance and selfless support during these two years of my Masters studies. His patience and unfailing encouragement have been the major contributing factors in the completion of my thesis research. I am heartfelt thankful to my parents, sister and brothers for their never ending love and support. Finally, I would like to thank all the professors and staff at the University of New Orleans who contributed in providing quality education. I would also like to thank the Saudi Ministry of Higher Education for supporting me financially throughout my studies. v TABLE OF CONTENTS LIST OF TABLES …………………………………………………………………………. viii
SIME: A Comprehensive Approach to Fast Transient Stability Assessment
IEEJ Transactions on Power and Energy, 1998
The Single Machine Equivalent (SIME) is a hybrid method resulting from the coupling of a time-domain transient stability program with the equal-area criterion. Its aim is to set up a software as general as the time-domain program with which it is coupled but much more powerful and faster than it. The paper shows how the method reaches the threefold objective : to properly and readily assess transient stability limits (such as critical clearing times and power limits) under any power system modelling and stability scenario, to identify the relevant system machines and to appraise stability margins. In turn, these latter pieces of information open possibilities towards handy sensitivity analysis and transient stability monitoring. In short, they pave the way for real-time transient stability preventive monitoring and control. A variety of sample simulations highlight the method and its specifics.
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2001 IEEE Porto Power Tech Proceedings (Cat. No.01EX502), 2001
Transient stability analysis of a power system is concerned with the system's ability to remain in synchronism following a disturbance. In utility planning, transient stability is studied by numerical simulation. The long CPU run times for simulation preclude their use for on-line security analysis. interest has therefore shifted toward the lyapunov direct method of stability analysis. This paper provides a critical review of research on direct methods since 7970. Considerable progress has been made on both theoretical p r o p erties of energy functions and on criteria suitable for on-line implementation. Current theory provides a satisfactory treatment of voltage-dependent reactive power demand, transfer conductances, and flux decay. However, it cannot incorporate the exciter control. Proposed on-line criteria appear to work very well on sample examples; but, they still lack rigorous justification. Finally, recent work has shown that power systems can exhibit chaotic behavior. This surprising fact demonstrates that our understanding of the dynamics of power systems remains incomplete.
Direct methods for transient stability analysis of power systems: Recent results
Proceedings of the IEEE, 2000
Transient stability analysis of a power system is concerned with the system's ability to remain in synchronism following a disturbance. In utility planning, transient stability is studied by numerical simulation. The long CPU run times for simulation preclude their use for on-line security analysis. interest has therefore shifted toward the lyapunov direct method of stability analysis. This paper provides a critical review of research on direct methods since 7970. Considerable progress has been made on both theoretical p r o p erties of energy functions and on criteria suitable for on-line implementation. Current theory provides a satisfactory treatment of voltage-dependent reactive power demand, transfer conductances, and flux decay. However, it cannot incorporate the exciter control. Proposed on-line criteria appear to work very well on sample examples; but, they still lack rigorous justification. Finally, recent work has shown that power systems can exhibit chaotic behavior. This surprising fact demonstrates that our understanding of the dynamics of power systems remains incomplete.
A Unified Approach to Transient Stability Assessment and Control 2 . 1
2005
A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. The organization of the resulting control schemes is then revisited in order to make it able to cover static and voltage security, in addition to transient stability. Distinct approaches for preventive and emergency operating conditions are advocated.