Power distribution network protection system based on limited wide area protection principle and power distribution network protection method thereof
A wide-area protection and protection system technology, applied in the distribution network protection system and its protection field, can solve the problems that the relay protection device cannot accurately locate the fault, and cannot realize the rapid removal of phase-to-phase faults, etc., and achieve the effect of rapid removal
Inactive Publication Date: 2017-02-08
NANJING INST OF TECH
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[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a distribution network protection system based on the principle of limited wide-area protection, and solve the problem that the relay protection device in the prior art cannot accurately locate the fault and cannot realize phase-to-phase faults Technical issues with rapid resection
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[0020] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0021] The distribution network protection system based on the principle of limited wide-area protection is based on the realization of wide-area protection functions. In addition to the functions of measurement, control, and communication in traditional protection devices, it also integrates an RS-485 control carrier communication interface for wide-area protection. The domain communication system provides the physical carrier. The distribution network protection system provided by the present invention mainly includes: protection devices distributed at each node in the power grid, and a local area communication network is established between each protection device through a communication modul...
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The invention discloses a power distribution network protection system based on a limited wide area protection principle. The power distribution network protection system comprises protection devices which are distributed at nodes in a power grid. Each protection device comprises the components of a master control module, an analog quantity acquisition module which is used for acquiring a voltage / current signal at a power grid node where the protection device exists, an action output module which is used for protection control, and a communication module which is used for performing real-time data transmission with other protection devices. The invention further discloses a power distribution network protection method. The power distribution network protection method comprises the steps of acquiring the voltage / current signal at the power grid node where the master control module exists by the master control module, and simultaneously acquiring the voltage / current signals at other power grid nodes through the communication module; analyzing corresponding three-phase current information according to the voltage / current information, calculating a differential current between two power grid nodes, generating a fault information matrix, positioning the fault information according to characteristics of the fault information matrix, and performing a relay protection action through an action output module. The power distribution network protection system and the power distribution network protection method can realize accurate positioning on single-phase grounding faults and quick inter-phase fault elimination.
Description
technical field [0001] The invention relates to the technical field of electric power protection, in particular to a distribution network protection system and a protection method based on the principle of limited wide area protection. Background technique [0002] With the development of various disciplines such as communications, computers and intelligent instruments, a new generation of wide-area relay protection technology is being developed and formed. The Wide Area Measuring System (WAMS) provides an effective means for relay protection to collect information of multiple nodes in the entire power grid at the same time, thus making it possible to quickly, reliably and accurately remove faults. At present, the traditional distribution network has many branch lines and complex structure. Although the relay protection device has been updated many times, it still cannot realize the accurate positioning of the single-phase ground fault, nor can it completely realize the rapi...
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IPC IPC(8): H02H7/28G01R31/08
CPCG01R31/086H02H7/28
Inventor 韩笑阮广俊吉宜月
Owner NANJING INST OF TECH