On-line monitoring device and method for voltage quality of electric power system

Abstract

The invention relates to on-line monitoring device and method for voltage quality of an electric power system. The voltage quality of various voltage grades from 10kV to 1000kV of the electric power system can be on-line monitored in real time; stable state data of deviation, harmonic waves, voltage fluctuation and flicker, three-phase unbalance, and the like of the voltage is fully monitored; and transient data of transient overvoltage and temporary overvoltage are simultaneously monitored. The on-line monitoring device can acquire voltages in various voltage grades in real time from multiple paths at high speed by adopting a multi-channel high-speed acquiring device, an automatic recording device, a storage device and a display voltage quality monitoring device, and simultaneously record various quality data of 32 voltages. The on-line monitoring device can automatically start the storage and the record of overvoltage temporary waveforms and calculate overvoltage multiple and temporary frequency. The recording time can reach 5s. The device adopts a linux multi-task operating system and the whole software adopts a Web / Brower manner.

Description

technical field [0001] The invention relates to an on-line monitoring device and method for voltage quality of a power system, in particular to a multi-channel, high-acquisition speed, long-time on-line monitoring device and method suitable for various voltage levels of 10kV to 1000kV in the power system. technical background [0002] In recent years, UHV DC transmission and the construction of clean energy such as wind power have been vigorously promoted by the state. The development of electrified railways and the extensive use of power electronic equipment and the application of power rectification and commutation technologies in various heavy industry sectors have generated a large number of harmonics injected into the grid. Distortion of the voltage waveform of the power system is caused. With the extensive use of these non-linear and impact loads, the voltage quality problem will become more prominent, and the impact and harm to the grid operation and sensitive electri...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the shortcomings of the existing voltage quality monitoring technology, solve the two aspects of technology, the timing steady-state measurement of the voltage quality and the transient waveform recording of the overvoltage, and provide a voltage quality online monitoring system for each voltage level at the same time. Monitoring device and method

[0005] The online monitoring device for voltage quality of electric power system of the present invention solves the difference between overvoltage transient waveform and steady-state timing measurement of other voltage quality, and is currently an online monitoring device that can simultaneously measure voltage quality steady-state and transient data

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