Index graded display method of port power grid electric energy quality monitoring system

Abstract

The invention belongs to the electric energy quality evaluation technical field and provides an index graded display method of a port power grid electric energy quality monitoring system. According to the index graded display method, an electric energy quality index graded display module is additionally installed in a conventional power grid electric energy quality monitoring system; through digging electric energy quality monitoring data, the module displays the single indexes and comprehensive indexes of electric energy quality in a graded manner with the three colors of green, yellow and red according to the severity degree of the deterioration of the indexes based on reasonable evaluation schemes; when index display color marks are green, it is indicated that the indexes are normal and no adverse consequences will be generated; when the index display color marks are yellow which means warning, it is indicated that the indexes begin deteriorating, and can continue to operate, but the causes for deterioration needs to be checked; when the index display color marks are red which means out-of-limit, it is indicated that the indexes are seriously deteriorated and downtime maintenance is required to exclude faults causing index deterioration. Based on the electric energy quality graded display method of the monitoring system, electrical personnel can accurately understand the electric energy quality condition of each monitoring point of the power grid and influence on operating equipment by using networked computers and in a web form or a smart phone application form, and therefore, a guarantee can be provided for the safe operation of the port equipment and power grid.

Description

technical field [0001] The invention relates to a power grid power quality monitoring technology, in particular to a method for grading and displaying indexes of port power grid power quality monitoring. technical background [0002] With the development of power electronics technology, high-power AC-DC-AC variable frequency drive lifting equipment and large-capacity PWM variable current shore power supply are widely used in the port power grid, generating 2k±1 (k is a positive integer) harmonics and power High harmonics and interharmonics related to device switching frequency, and inject negative sequence current into the grid. At the same time, the power impact phenomena such as frequent lifting and lowering during the operation of the crane will cause voltage transient change interference. Therefore, it is of great significance to establish a rigorous and effective harmonic monitoring system for port power grids to monitor and analyze the harmonic conditions of important...

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Problems solved by technology

[0003] Conventional power quality monitoring systems generally provide power quality index data in the form of curves, waveforms, tables, etc., but most port electrical personnel have limited analysis capabilities for power quality indicators, and it is difficult to quickly and correctly judge the impact of current power quality on port electrical equipment and information. Whether the operation of the equipment and the power grid has adverse effects

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