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A digital virtual out-of-step relay

A technology of relays and current transformers, applied in the field of digital virtual out-of-step devices, can solve problems such as low accuracy, inability to monitor in real time, and errors in Fourier transform methods

Active Publication Date: 2019-05-03
STATE GRID LIAONING ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Avoid the complex calculation and analysis of the traditional impedance-type out-of-step relay setting value, avoid the serious error of the Fourier transform method in the prior art, and solve the technical problems of high cost, low accuracy, and inability to monitor in real time in the prior art

Method used

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  • A digital virtual out-of-step relay
  • A digital virtual out-of-step relay
  • A digital virtual out-of-step relay

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Embodiment Construction

[0065] The specific implementation manners proposed by the present invention will be further described below in conjunction with the above-mentioned drawings. Such as figure 1 As shown, a structural frame diagram of a digital virtual out-of-step relay is provided. The hardware of the system consists of a data acquisition module, STM32F107, a digital-to-analog conversion module and related external interfaces. The external hardware includes a GPS receiver, a rotor position sensor, Voltage transformer, current transformer, etc., in which the data acquisition module is connected to the voltage transformer and current transformer, and the data information is collected to the STM32F107 module. STM32F107 is the core module, connected to the GPS receiver, rotor position sensor, and digital-to-analog conversion module .

[0066] The rotor position sensor is used to measure the power angle δ at the generator end, utilizes the corresponding relationship between the rotor position of th...

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Abstract

The invention discloses a digital virtual step-out relay which finally sends out an action signal or a holding signal through a series of processing processes of the measuring data of the PMU by a processor, and belongs to the technical field of power system relay protection. The hardware of the relay is provided with a data acquisition module, an STM32F107, a digital-to-analog conversion module and an associated external interface, the external hardware comprises a GPS receiver, a rotor position sensor, a voltage transformer, and a current transformer. The relay provided prevents the complicated calculation and analysis of the setting value of a traditional impedance type out-of-step relay, and prevents the problem that the Fourier transformation method in the prior art is serious in error, and the technical problems that in the prior art, the cost is high, the accuracy rate is low and the real-time monitoring cannot be achieved are solved.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a digital virtual out-of-step device. Background technique [0002] The relay protection device of power system develops from relay to microcomputer protection, its adaptability is stronger and stronger, and its function is more and more important. At present, the impedance-type out-of-step relays in the prior art are widely used in generators. The principle is to realize the judgment and adjustment of system stability by monitoring the impedance track changes at the generator end. However, this technology is not suitable for different operating conditions. The quantitative analysis of the critical setting value of out-of-step is very difficult, so the scope and method of application are greatly limited. [0003] Another application in the prior art is microcomputer protection. Microcomputer protection uses special measuring components and determin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/06
CPCH02H7/06
Inventor 葛维春李江王爱华李正文何晓洋闫春生王印李斌李典阳张建
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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