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Research on Method of Line Loss in Low-voltage Distribution System for Hybrid Wiring

Author: LiChangSu
Tutor: YangLiZuo
School: Zhengzhou University
Course: Proceedings of the
Keywords: low-voltage distribution system line loss three-phase load unbalance hybrid wiring Four-wire method
CLC: TM744
Type: Master's thesis
Year: 2009
Downloads: 19
Quote: 0
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Abstract


To reduce the electric energy loss in electric power grid is the work emphases in all levels power supplying and using departments in China, and is also the main way to save energy source. Theoretical calculation of line losses is not only the foundation to study out reasonable measures to decrease the line loss, but also the basis to do a good job in the management of line losses, to formulate the check index for line loss.This article focused on an analysis of hybrid wiring radial network structure in low-voltage distribution system, as well as the resultant of the phase voltage drop, the impact of the flow, and the impact of line losses in the whole network. As a result of the existence of a large number of single-phase load in the low-voltage distribution network, the three-phase voltage unbalance in the distribution network is much more complex serious than the mid-voltage distribution network. There are not only the unbalance of single-phase loads and three-phase loads themselves, but also the unbalance of four-wire power lines which depends on the wiring phase of the single-phase loads which flow through them.Each phase voltage drop considering three-phase load unbalance is analyzed in this paper, then the user’s each phase voltage drop on unbalance load is calculated and analyzed. In this paper, on the basis of power flow calculation which consider three-phase load unbalance in radial low-voltage distribution network, the simplified calculation method of line loss based on user’s electrical quantity is presented, namely four-wire method, which has solved the line loss calculation problem of the hybrid wiring low-voltage distribution network under load unbalance condition. Then line loss of hybrid wiring network of several typical load unbalance condition by this method is calculated and reducing-loss is analyzed, which prove the effectiveness of four-wire method.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system simulation and calculation > The calculation of the power system
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