Electric energy quality early warning method

Abstract

The present invention relates to an electric energy quality early warning method which is realized through a mean value-standard deviation control chart. The control chart comprises a mean value control chart and a standard deviation control chart. The method comprises the steps of determining the early warning indicator of electric energy quality, judging whether the early warning indicator excesses a standard, preparing the sample group of the historical data of electric energy quality, determining the control limit of a mean value-standard deviation control chart, judging the stability of the data through the sample group through the mean value-standard deviation control chart, judging whether the real-time monitoring data of the electric energy quality is abnormal or not, judging an early warning level according to the abnormal type of the monitoring data, and giving early warning information. According to the invention, the electric energy quality early warning method is used to establish an electric energy quality early warning system, the safety problems or potential problems in a grid are found timely, early warning information is given, the timely adoption of the control measures by an operator is facilitated, the problems are processed as soon so possible or the potential problems are solved in the bud, the grid safety operation and equipment maintenance are served, and the method has a practical meaning for ensuring the reliable operation of a grid.

Description

Technical field: [0001] The invention relates to a power quality early warning method, more specifically to a power quality early warning method based on a mean value-standard deviation control chart. Background technique: [0002] With the development of new technologies in power electronics, the rapid growth of new energy power generation and distributed power generation, and the large number of power quality interference source users connected to the power grid, the factors that generate power quality disturbances in the transmission network continue to increase, and power quality disturbances also present new trends. The characteristics of the grid have brought great challenges to the operation of the power grid. Wind power, photovoltaic and other power generation bases are scattered in the "Three Norths" and the southeast coast. Large-scale new energy power generation needs to be transported to the load center over long distances. The random fluctuation and intermittenc...

AI Technical Summary

Problems solved by technology

However, the research on the extraction, analysis, and identification of power quality disturbance information using monitoring data is not deep enough. The alarm for power quality problems is mainly through the method of judging whether each index exceeds the threshold. An alarm is given after a power quality problem occurs, but the research on abnormal detection and early warning mechanism of index data is lacking

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