Real-time monitoring system and method for power grid

Abstract

An embodiment of the invention discloses a real-time monitoring system and method for a power grid and belongs to the technical field of power grid control. The system comprises a signal acquisition module, a signal conditioner and a processing and control module. The signal acquisition module is used for performing real-time alternating current sampling on current and voltage channels; the signal conditioner is used for obtaining filtering signals by removing ultraharmonics capable of causing aliasing through an anti-aliasing filter circuit in a filtering mode. The processing and control module is used for calculating the filtering signals to obtain effective values, power and power factors of a three-phase voltage, a zero-sequence voltage and a current, a total harmonic distortion rate and a single harmonic ratio, comparing the calculated results with an allowable value to determine whether the calculated results exceed the limit, emitting alarm signals if the calculated results exceed the limit, and controlling eradication of current harmonics or arc light earth faults. The real-time monitoring system and method can be widely applied to substations or power stations of an electric system and power supply systems of enterprises of metallurgy, mines, petrochemical industry and the like, and the power supply reliability and the safety operation of the system are improved remarkably.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to a real-time monitoring system and method for a power grid. Background technique [0002] Most of the medium-voltage power grids in my country are small-current grounding systems, that is, neutral-point indirect grounding systems. When a single-phase grounding fault occurs and the single-phase grounding current is large, it is easy to generate arcing grounding overvoltage and phase-to-phase short circuit, thus It has caused great harm to the power supply equipment and led to accidents. Fault statistics for power supply and distribution systems show that the probability of single-phase ground faults accounts for more than 66%. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a system and method for real-time monitoring of the power grid, which can monitor the operating data in the power grid in real time, analyze ...

AI Technical Summary

Problems solved by technology

[0002] Most of the medium-voltage power grids in my country are small-current grounding systems, that is, neutral-point indirect grounding systems. When a single-phase grounding fault occurs and the single-phase grounding current is large, it is easy to generate arcing grounding overvoltage and phase-to-phase short circuit, thus It caused great harm to the power supply equipment, leading to accidents

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