Reliability assessment method for power grid multi-link system

A reliability and link technology, applied in the field of power system, can solve problems such as system reliability index evaluation, achieve the effect of statistical analysis of reliability engineering data and reduce the number of system states

Active Publication Date: 2014-07-09
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

Assuming that the power supply of the distribution network is absolutely reliable w

Method used

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  • Reliability assessment method for power grid multi-link system
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  • Reliability assessment method for power grid multi-link system

Examples

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Embodiment 1

[0095] Such as figure 2 As shown in the diagram of the transmission grid used in this example, the grid contains 24 nodes of two different voltage levels, including 10 230kV nodes and 14 138kV nodes, and is equipped with 5 230kV transformers, 21 circuits of 230kV lines, 138kV There are 10 lines of lines and 2 lines of 138kV cables.

[0096] Such as image 3 Shown is the distribution network diagram used in this example. The distribution network is based on the IEEE-RBTS BUS6 feeder. Each load point distribution transformer is equipped with a fuse, and each section of the line is equipped with a section switch. That is, the system has 40 load nodes, 38 fuses, 38 distribution transformers, 11 circuit breakers, 15 isolation switches, and 1 tie switch.

[0097] Suppose the failure rate of the line is 0.05 times / (year·km), and the repair time is 8h; the transformer failure rate is 0.015 times / (year·unit), and the repair time is 48h; the operating time of the isolation switch is t b 0.5...

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Abstract

The invention discloses a reliability assessment method for a power grid multi-link system. According to the method, influences of a power transmission network on the reliability of a power distribution network are quantified through the equivalence of the reliability of a load and the reliability of a power supply, the limitation of the assumption that traditionally the reliability of a traditional power distribution network is that the power supply is completely reliable is broken, and a calculation result accords with engineering practice of the power grid; in the method, a loop is used as the basic unit of a reliability assessment of the power transmission network, and a preconceived accident set is further formed, so that the system condition number in the preconceived accident set is substantially reduced, and the statistic analysis of engineering data of the reliability is facilitated. The reliability assessment method can be used for analysis of the sensitivity of reliability indexes to reliability parameters and enhancement measures relevant to the power transmission network or the power distribution network, and consequently planning, operation and maintenance of a power supply enterprise can be guided.

Description

Technical field [0001] The invention relates to the technical field of electric power systems, and in particular to a reliability evaluation method of a multi-link system of a power grid. Background technique [0002] The power system needs to pass through several subsystems such as power generation, power transmission, and power distribution to complete power transmission. Each subsystem participates in power transmission as a link, making the power grid a multi-link system. According to the principle of "unified dispatch and hierarchical management", the power grid can be divided into three levels: provincial power grid, prefectural power grid and distribution network. The power system network structure, primary equipment, secondary system, operating characteristics and control behavior directly affect the power supply capacity and power supply quality. The system reliability is transferred from the power source to the load step by step, passing through the provincial power gri...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
CPCY04S10/50
Inventor 黄嘉健郑文杰李端姣陈炯聪余南华黄曙汪隆君王钢陈小军赵继光李传健周克林陈辉张晓平宋旭东
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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