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Power System Voltage Stability Margin Assessment Using Synchronous Wide Area Measurement System (WAMS)

Mohammad Amini, Alireza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53132 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Parniani, Mostafa
  7. Abstract:
  8. Although voltage control and stability issues are not new to the electricity industry, but nowadays, in most modern power systems, special attention has been paid to this issue. Once, only weak systems with long lines were involved in voltage instability, while today due to heavy loading, voltage stability is a serious concern even in developed networks. Over tim, with increasing demand for electricity and emergence of electricity market and economic constraints, power systems are more exposed to voltage instability and even voltage collapse. Therefore, reliable operation of the system in such circumstances requires evaluating voltage stability of the network at both stages of planning and operation, and especially online monitoring of voltage stability. On the other hand, wide-area measurement systems(WAMS) using synchronized phasor measurement units, due to high accuracy and speed, can be a good tool for monitoring and evaluating the system stability. Despite numerous studies, there are still major shortcomings in the proposed methods for system-wide voltage stability assessment using WAMS. In this study, we propose a comprehensive and accurate method to assess the voltage stability margin of the system globally and not locally, taking into account the various equipment used in power systems, while considering their functional limitations, by using wide area measurement data. For this purpose, in the first step, a framework has been proposed for state estimation of power system using the available PMU data. Using the results of this estimation and the developed models, a comprehensive method is provided for assessing voltage stability in the presence of various equipment in the power system. In the proposed algorithm that uses a combination of measurement data and power system model, the actual characteristics of different types of electrical loads, as well as the constraints like the lines loadability and generation limits are considered and their impacts are investigated. Finally, we will assess the proposed method by implementing it on a standard power system
  9. Keywords:
  10. Voltage Stability ; Wide Area Measurement System ; State Estimation ; Voltages ; Modal Analysis ; Voltage Sensitivity ; Voltage Stability Margin Assessment

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