An Ethernet-Based Power Quality On-Line Monitoring Device

Abstract

The invention discloses an Ethernet-based power quality on-line monitoring device comprising a power grid 1, a data acquisition sub module 2, a DSP analysis sub module 3, a basic electrical parameter coprocessor 4, an industrial personal computer secondary storage and control sub module 5, and a power quality management platform 6. The DSP analysis sub module 3 mathematically analyzes power grid voltage and current waveform data acquired by the data acquisition sub module 2 to obtain power quality index data, and the DSP analysis sub module 3 reads high-precision basic electrical parameter data obtained by the basic electrical parameter coprocessor 4 and transmits the high-precision basic electrical parameter data and the power quality index data to the industrial personal computer secondary storage and control sub module 5 in real time. The power quality management platform 6 calls data from the industrial personal computer secondary storage and control sub module 5 regularly, periodically or artificially. The power quality management platform 6 mainly completes statistical and expert analysis of harmonics and inter-harmonics, voltage fluctuation and flickering, amplitude-frequency deviation, transient disturbance and other indexes. By adopting the device, power quality can be monitored and analyzed in a real-time and comprehensive manner, especially, harmonics, inter-harmonics, transient disturbance and flickering can be monitored, the accuracy and real-time performance are improved, and the frequency resolution is improved.

Description

technical field [0001] The invention relates to the technical field of online power quality monitoring, in particular to an Ethernet-based power quality online monitoring device. Background technique [0002] With the development and promotion of smart grid technology, user-side distributed power generation (such as wind power generation, photovoltaic power generation, biomass power generation, etc.) Large-scale applications have a great impact on the reliability of grid power supply and the power quality of power distribution systems. The intermittent and random nature of distributed power will cause voltage fluctuations and flicker in the distribution network, resulting in the voltage quality of some nodes exceeding the standard; inappropriate inverter control strategies in distributed power will produce unbalanced voltage and harmonic pollution , have adverse effects on the user-side electrical equipment; distributed power grid-connected operation will reduce the reliabi...

AI Technical Summary

Problems solved by technology

At present, the online power quality monitoring devices on the market mainly have the following deficiencies: the accuracy and real-time performance of online power quality monitoring are insufficient; the digital communication capability is limited, and remote data exchange and sharing cannot be realized.

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