Synchrophasor measurements-based under frequency load shedding using bus voltage index and estimated disturbance magnitude

Hassan Haes Alhelou, M. E.H. Golshan, T. Njenda, Pierluigi Siano, Giuseppe Marco Tina

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When a disturbance occurs in a power system which leads to a decline in frequency, the power grid voltage stability is also at risk. In this research, we propose an improved under frequency load shedding technique that incorporates both the estimated disturbance and the voltage index of load buses. Based on the swing equation the disturbance is estimated in real time and the value is used for load shedding. Instead of shedding prefixed load-buses, all load-buses participate in the shedding process. When a disturbance occurs the voltage drop of each bus is expressed as a fraction of the total calculated voltage drops, and this gives the bus voltage index of the load buses. The greater the bus voltage index the more the load that is to be shed from the respective bus. It is also shown that the use of phasor measurements reduces the complexities of using the Jacobian to calculate voltage stability indicators.

Original languageEnglish
Title of host publication2020 28th Iranian Conference on Electrical Engineering (ICEE)
EditorsHadi Seyedarabi
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages5
ISBN (Electronic)9781728172965
ISBN (Print)9781728172972
Publication statusPublished - 2020
Externally publishedYes
EventIranian Conference on Electrical Engineering (ICEE) 2020 - Tabriz, Iran
Duration: 4 Aug 20206 Aug 2020
Conference number: 28th (Proceedings) (Website)

Publication series

Name2020 28th Iranian Conference on Electrical Engineering, ICEE 2020
PublisherIEEE, Institute of Electrical and Electronics Engineers
ISSN (Print)2164-7054
ISSN (Electronic)2642-9527


ConferenceIranian Conference on Electrical Engineering (ICEE) 2020
Abbreviated titleICEE 2020
Internet address


  • Bus voltage index
  • Disturbance estimation
  • Power systems
  • Under frequency load shedding (UFLS)

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