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The Effect of Reconfiguration on the Operation of Smart Distribution Systems with Distributed Generations

Dorostkar Ghamsari, Mohammad Reza | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50748 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fotuhi-Firuzabad, Mahmud
  7. Abstract:
  8. In this dissertation, the value of distribution network reconfiguration in presence of distributed generation is investigated. In the first step, a mathematical optimization model is devised to minimize daily network losses via applying hourly reconfigurations. The results show that the hourly reconfiguration reduces the losses. Then, sensitivity analyses on the renewable penetration, wind and load correlation, switching cost and wind power prediction are conducted and discussed. The switching cost analysis revealed that a great amount of loss reduction could be attained with a small number of switching operations. The worthiness of reconfiguration becomes more in systems with high penetration of wind and solar generations due to their generation variations. In the second step, a stochastic operation framework including two hierarchical stages is proposed for the operation of distribution systems with high penetrations of renewable generations. The hourly reconfiguration is considered in the proposed operation framework. The uncertainty in predictions of wind generation, real time prices, and load profile are included. The objective is to minimize the expected operation cost while satisfying the acceptable level of risk. The proposed framework was applied to IEEE 33-bus system. The results declare that by assigning an appropriate value to the switching cost, it is possible to prevent too many switching actions while the operation cost is reduced via reconfiguration. In the third and last step of this dissertation, the effect of online reconfiguration on the utilization coefficient of substation transformers is evaluated. The online reconfiguration can help to increase the load transfer between adjacent distribution networks which in turn can lead to higher transformer utilization. In this dissertation, a novel methodology including two hierarchical stages is presented to improve transformer capacity utilization. The results illustrate that the transformer capacity utilization can be significantly improved through online reconfiguration
  9. Keywords:
  10. Reconfiguration ; Operation ; Distributed Generation ; Electricity Distribution Network ; Smart Distribution Networks

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