Investigation of the AVR Output Voltage Limits in Power System Voltage Stability Assessment
Hadi Razmi
Dr. Hadi Razmi, Department of Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran.
Manuscript received on May 01, 2014. | Revised Manuscript received on May 03, 2014. | Manuscript published on May 05, 2014. | PP: 97-101 | Volume-4 Issue-2, May 2014. | Retrieval Number: B2197054214/2014©BEIESP
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Abstract: Voltage stability problems have been one of the major concerns for electric power utilities due to increased interconnections and loading of the present day power systems. The accurate representation of the voltage instability phenomena requires a detailed model of power system components (generators, transformers, loads, etc.). On the other hand, reactive power generation limits have a significant effect on voltage collapse. In general, the system equations change non-smoothly when these limits are encountered. This paper presents a continuation-based method to steady-state voltage stability analysis that considered complete model of power system and the automatic voltage regulator (AVR) output voltage limits that indirectly control the reactive power generation limits. Results are provided for the New England 39-bus power system model. By comparing results obtained through this method and the continuation power flow (CPF) method, it is concluded that for design and developing the power systems, using proposed method seems a better approach due to its higher accuracy.
Keywords: Steady-state voltage stability, automatic voltage regulator (AVR) output voltage limit, power system differential-algebraic equation (DAE) model.