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Harmonic State Estimation of Power Systems with Limited Measurements

Shafiee Rad, Marjan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43302 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Karimi, Houshang; Mokhtari, Hossein
  7. Abstract:
  8. The level of current and voltage harmonics in power networks has been increased due to the widespread use of power electronic equipment. This increase may, in turn, result in damage to power system equipment in addition to extra power losses in the network. In order to assess the level of harmonics, it is required to monitor power networks using power quality analyzers. However, due to the high costs, only limited number of measurements can be used in practice. The task of harmonic state estimation is to identify the location and magnitude of harmonic sources and to estimate the harmonic voltage and current by partial measurements. Due to the high price of measurement instruments and installation of communication channels, only a limited number of harmonic meters may be employed. The quality of the estimates is a function of the number and location of the measurement points. Therefore, a systematic procedure is needed to design the optimal measurement placements. In this thesis, a new optimal algorithm is presented that minimizes the number of measurements and the error of estimation at the same time. The proposed method also makes the system fully observable. The method is tested on the IEEE 14-bus power system and Mazandaran transmission power network to show its precision. Finally, the sensitivity of this algorithm to some factors is also studied.

  9. Keywords:
  10. Power Quality ; Harmonics ; Power Systems ; State Estimation ; Observability ; Estimation Error ; Measurement Placement

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