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Power System Voltage Stability

Power System Voltage Stability
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Author(s): Hemanthakumar Chappa (Maulana Azad National Institute of Technology, India) and Tripta Thakur (Maulana Azad National Institute of Technology, India)
Copyright: 2020
Pages: 17
Source title: Novel Advancements in Electrical Power Planning and Performance
Source Author(s)/Editor(s): Smita Shandilya (Sagar Institute of Research, Technology and Science, India), Shishir Kumar Shandilya (Vellore Institute of Technology, India), Tripta Thakur (Maulana Azad National Institute of Technology, India) and Atulya K. Nagar (Liverpool Hope University, UK)
DOI: 10.4018/978-1-5225-8551-0.ch010


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Understanding the voltage instability phenomenon and its effects in detail facilitates the research community to develop methodologies that can detect instability in a timely manner. Traditionally voltage instability in the system is identified through P-V and Q-V curves that are plotted using repetitive runs of load flow programs. It is observed that voltage stability is affected by the load dynamics, voltage control devices like OLTC, and hitting of over excitation limiters of the synchronous generators. In the following sections of this chapter, the concept of voltage instability with P-V and Q-V curves, load restoration mechanism with on load tap changer (OLTC), and with different types of loads are briefly presented.

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