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Gan G.,Chongqing University | Wang Z.,Chongqing University | Zhou Y.,Hangzhou Electric Power | Li L.,Yuxi Electrical Power Supply Bureau | Li X.,Yuxi Electrical Power Supply Bureau
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2015

The closed-loop operation mode and features of medium voltage distribution networks at home and abroad are described. With both reliability and economy considered, a net profit model for upgrading the distribution network from open-loop operation to closed-loop operation is developed, including a simplified evaluation model of system average interruption duration index (SAIDI) for a medium voltage cable feeder. The difficulties and applicable scopes of closed-loop operation are discussed. The study results show: i) further improvement of power supply reliability is impeded because of the existing power supply mode of closed-loop design and open-loop operation for domestic distribution networks; ii) for areas of developed economy, large load density, distributed generation and high reliability requirement, the closed-loop operation mode (mainly one of two feeders from the same bus) can be considered for use conditions permitting. Despite a higher cost for the power supply company owing to the use of the closed-loop operation mode, power supply reliability is improved while good social and economic benefits are ensured at the same time. ©2015 Automation of Electric Power Systems Press

Ye Y.,Chongqing University | Wang Z.-D.,Chongqing University | Wang Z.-D.,Chongqing Electrical Energy Star Co. | Zhang Z.-Y.,Chongqing University | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

Considering the features of high, middle and low voltage distribution network planning, the methods for estimating the energy loss rate are presented. Especially, regarding the complicated middle and low voltage distribution networks, a loss coefficient method and a factor correction method of allowable loss rate are proposed to overcome the problems of data deficiency of feeders and fuzzy load distribution information. A numerical example shows the method of energy loss estimation for distribution network planning is effective and practical.

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