Loading...

Determination of Current Harmonics Cost in Distribution Transformers

Moosavi, Khadijeh | 2024

9 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 56937 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Transformers are vital components of power networks, responsible for converting electricity from one voltage level to another. They are designed to operate under sinusoidal conditions, but the increasing use of non-linear loads and power electronic devices has caused a spike in harmonic pollution in power networks. These harmonics result in increased losses in transformers, leading to a reduction in capacity, accelerated aging, and a shortened life. The associated costs incurred by these issues include reduced energy sales for electricity companies and premature replacement costs. In this thesis, it is assumed that the transformer is affected by harmonics and ambient temperature, and other stresses such as short circuits, load switching, etc., have not been considered in the calculations. Therefore, the costs arising from harmonics in transformers have been examined, and a suitable mathematical model has been presented for them. This thesis aims to investigate the financial costs of harmonic pollution in transformers and develop appropriate mathematical models to quantify them. The simulations conducted highlight the significant impact of harmonic pollution on transformers, emphasizing the need to consider these costs when designing and operating power networks. Furthermore, the costs associated with harmonic pollution become more pronounced as the transformer capacity increases. To improve equipment health monitoring and prevent potential damage due to inappropriate usage, an algorithm has been proposed to estimate the hot spot temperature of transformers online, based on load modeling and computational volume reduction. The hot spot temperature refers to the area of the transformer where the highest temperature is recorded, which is often a critical indicator of equipment health. The simulations conducted indicate that this algorithm exhibits commendable accuracy and can be used to proactively issue warnings and avoid potential damages. Given the significant economic impacts of harmonic pollution on transformers, it is critical to incorporate this factor into the design and operation of power networks. By quantifying these costs and developing appropriate algorithms for equipment health monitoring, power companies can minimize downtime, reduce replacement costs, and enhance operational efficiency. Overall, the research presented in this thesis provides valuable insights into the financial implications of harmonic pollution in transformers and highlights the importance of proactive measures to mitigate these effects
  9. Keywords:
  10. Transformers ; Hot Spot ; Harmonic Analysis ; Aging ; Cost Analysis ; Loss of Life

 Digital Object List

 Bookmark

No TOC