Power quality monitoring method and system

Abstract

The invention discloses a power quality monitoring method. Through a data acquisition terminal which is arranged in a substation, a GPS timing server carries out unified timing. The electrical amount real-time data of a monitor point are synchronously acquired. The data acquisition terminal sends the acquired electrical amount real-time data with a time mark to a cloud operation server through a cloud communication server via a high-speed wireless communication network. The cloud operation server carries out operation on the electrical amount real-time data to acquire power quality data and non power quality data. The acquired data are saved in a cloud database server. A cloud advanced application analysis server extracts the power quality data and the non power quality data, and carries out real-time display, historical trend statistics, report generation and output, waveform playback display and harmonic source retrospective analysis on monitor data to complete power quality analyzing and managing. According to the invention, operation and maintenance costs of a system are greatly reduced, so that the scalability of a monitoring system is fundamentally improved.

Description

technical field [0001] The invention relates to the technical field of power system monitoring, in particular to a method and system for monitoring power quality. Background technique [0002] There are a large number of nonlinear, impact and fluctuating loads in the power system, such as high-power frequency conversion equipment and drive devices, electrified railways, rectification equipment in the electrified industry, induction heating furnaces, electric arc furnaces, etc. These loads cause waveforms in the power grid Distortion (harmonic), voltage fluctuation, flicker, three-phase unbalance, and asymmetry seriously degrade the power quality of the power grid. At the same time, precision electronic instruments based on computers and microprocessors are widely used in national economic enterprises, and their sensitivity to power supply quality is getting higher and higher, which puts forward higher requirements for power quality, so that power quality problems and their s...

AI Technical Summary

Problems solved by technology

[0003] The existing construction methods of power quality monitoring systems have problems such as inconsistent monitoring terminal measurement algorithm standards, inconsistent measurement accuracy, asynchronous data sampling, inconsistent data communication protocols, limited wired Ethernet network bandwidth, and inability to transmit real-time data. Poor scalability, difficult to upgrade and maintain, poor real-time performance, the measurement results cannot meet the A-level consistency requirements of the International Electrotechnical Commission (IEC) power quality standard, and cannot really provide scientific, effective and authoritative decision-making basis for power grid operation and accident analysis. Holds back the development of a "robust" and "unified" smart grid

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