Tianjin University

Chengshan Wang

Jing Min Xu

Yixin Yu

Xuan Wu

Nan Ge

Jiacheng Fo

Fengzhang Luo

Wenzhuo Gu

Shengyuan Wang

Qiubo Zou

Kuangyu Kong

Xiaoyu Qiu

Jun Xiao

Tianyu Zhang

A method of analytical calculation of power supply reliability indexes of a power distribution network includes (A1) acquiring parameters of the power distribution network; (A2) building a reliability calculation model, which includes treating the power distribution network as a node-branch calculation unit and numbering nodes and branches in the power distribution network; (A3) building correlation matrices, and calculating a power supply path matrix and a tie-line matrix, wherein the correlation matrices are a node-branch association matrix, a section switch matrix and a fuse matrix; (A4) deriving a fault incidence matrix through the power supply path matrix, the section switch matrix, the fuse matrix and the tie-line matrix, and calculating the reliability indexes of the nodes and the power distribution network; and (A5) identifying vulnerable links by performing sensitivity analysis through partial derivative transformation for quantifiable parameters or perturbation transformation for unquantifiable parameters on an expression of the reliability indexes.

Method, software system, server and physical terminal of analytical calculation of power supply reliability indexes of complex power distribution networks with multi-connections

The invention discloses a region-based security evaluation method for the distribution system, which belongs to the eld of electric power distribution system operation. The method contains the following steps: (1) acquiring distribution system security region and security boundaries according to substation transformer capacity of the distribution system and link relationships among the substation transformers (); (2) acquiring the distance between operating point and the security boundaries (IO); (3) judging whether the operating point is within the distribution system security region according to the distance between the operating point and security boundaries (); if yes, performing step (4), otherwise, performing step (5); (4) acquiring the load shortage or excess L,- of a link unit (I); (5) adjusting the load of the substation transformers until the operating point comes back to the distribution system security region, then performing step (4) (IO). The method provides more information than traditional N-I simulation in distribution system security assessment; and reduces calculation, increases the operating speed and satisfies the requirement of real-time and on-line operation.

Region-based security evaluation method for the electric power distribution system

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Tianjin, China

Chengshan Wang