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Evaluation method of intelligent substation protection system based on virtual branch

A technology of intelligent substation and protection system, applied in the field of intelligent substation protection system evaluation based on virtual branch, can solve the problem of underestimating the importance of merged units, and achieve the effect of reducing workload, avoiding calculation errors and improving efficiency

Active Publication Date: 2021-01-15
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO +2
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Problems solved by technology

[0009] However, its shortcoming is that it underestimates the importance of devices such as merging units in different protection intervals, and can only perform reliability evaluation on the secondary system.

Method used

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  • Evaluation method of intelligent substation protection system based on virtual branch
  • Evaluation method of intelligent substation protection system based on virtual branch
  • Evaluation method of intelligent substation protection system based on virtual branch

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Experimental program
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Embodiment 1

[0040] by figure 1 The typical three-voltage level smart substation shown is the object, and the voltage levels of the high, medium and low voltage sides are 220kV, 110kV, and 35kV respectively. The buses in the station are Bus01~06, the lines are L1~L10, and B01~B18 are circuit breakers. The substation adopts electronic transformers and merging units to realize the collection of primary exchange information; realizes the intelligence of primary equipment through conventional circuit breakers and intelligent terminals; the process layer SMV network is configured according to sub-networks. Since the mean time before failure (MTTF) of the electronic transformer is much longer than that of the protection device, the transformer is not considered in the reliability model, and the reliability of other components P TS ,P MU ,P SW ,P SV ,P IED ,P EU Take the value according to Table 1.

[0041]Table 1. Reliability value table of other components

[0042]

[0043] Take line...

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Abstract

The invention discloses an intelligent substation protection system evaluation method based on a virtual branch, which aims to reduce the workload of reliability analysis of a transformer substation,improve the efficiency, avoid calculation errors, protect the overall reliability analysis of a system, and achieve the purpose of intelligent substation protection configuration optimization; the system comprises the following steps: firstly, dividing relay protection elements in the intelligent substation into line protection, bus protection and transformer protection according to protection types, and respectively establishing virtual branches and generating a reliability block graph; secondly, respectively calculating the reliability of different types of protection according to the reliability block graph so as to obtain the overall reliability of the relay protection system in the station; analyzing the importance of different elements in the protection system by a probability importance method.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to an evaluation method for an intelligent substation protection system based on a virtual branch. Background technique [0002] With the development of IEC 61850 standard, information communication technology and intelligent equipment, the construction and development of intelligent substation, which is an important physical support and foundation of smart grid, has become a new hot spot. Different from the relay protection of traditional substations, smart substations use electronic transformers to collect electrical quantities, transmit data through SV networks and GOOSE networks, and finally control whether the circuit breakers operate through intelligent terminals. There are big differences in the above. The reliable operation of the relay protection system plays a vital role in ensuring the safety of equipment in smart substations an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/28
CPCG01R31/2827
Inventor 王增平殷伟斌金山红徐光年马静郭磊王磊明蔡溢行冯朝力陆建琴林一峰朱劭璇孙吕袆郭雨涵王桐
Owner STATE GRID ZHEJIANG ELECTRIC POWER CO LTD JIAXING POWER SUPPLY CO
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