The dynamic behavior of a solid state transformer (SST) during recloser operation in distribution systems.

摘要

Electrical power systems are continuously facing increasing electrical power demand in the last years to meet the requirements of modern life style. In order to satisfy such needs electricity authorities are taking appropriate measures to enhance the performance of power networks. One of the solutions to meet the customer's demands for energy was the trend to use the renewable energy. The increasing use of renewable energy and other distributed generation sources made the electrical grid more complex. Many researches have been carried out to find out solutions to overcome this complexity. One of these researches -- which was on a Solid-State Transformer technology- attracted scholars in recent years. The motivation for this thesis is to study the behavior of the SST under operation of protective devices such as recloser and fuse. In order to investigate the dynamic behavior of the SST, a recloser model has been designed and implemented in PSCADRTM/EMTDC(TM). The accuracy of the model has been verified through comparison between simulation and theoretical results. Then, the recloser model has been deployed in a small distribution system along with the SST. Finally, different SLG fault scenarios have been applied and the SST has been investigated.