Method for early warning of sensitive client electric energy experience quality under voltage dip disturbance

Abstract

The invention provides a method for early warning of sensitive client electric energy experience quality under the voltage dip disturbance. The method comprises the steps that based on the S conversion rapid algorithm and an increment SVM classifier, voltage dip disturbances of sensitive clients are automatically identified; based on identification results of the voltage dip disturbances, voltage tolerance curves of devices corresponding to multiple types of sensitive clients at different load levels are determined; historical monitoring data of the voltage dip disturbances serve as samples, the samples are converted into sample values of a voltage dip amplitude ponderance index MSI and a lasting time ponderance index DSI, a probability density function of the MSI and the DSI is determined on the basis of the maximum entropy principle, the sensitive device fault probability is evaluated, and the probabilities of the sensitive devices corresponding to the sensitive clients at the voltage dip level are obtained. By the adoption of the method for early warning of sensitive client electric energy experience quality under the voltage dip disturbance, the electric energy quality disturbance condition can be accurately monitored, whether a client load is influenced by the disturbance or not is determined according to the load sensitivity degree of each client, and potential risks of load operation are found.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for early warning of power experience quality of sensitive customers under voltage sag disturbance. Background technique [0002] In recent years, with the development of modern industry and economy, sensitive loads such as computers and power electronic equipment have been widely used in various industries, causing power customers to be very sensitive to voltage sags, voltage swells, and short-term interruptions. Or the failure of components may cause great economic losses. On the other hand, some fluctuating or impact loads such as electric arc furnaces, rectifiers, single-phase loads, and high-power motors are incorporated into the grid, especially the injection of a large number of harmonic and sub-harmonic components, resulting in voltage and current waveforms in the grid Seriously distorted. In addition, some external factors such as lightning, external f...

AI Technical Summary

Problems solved by technology

The objective existence of power quality problems and the sensitive characteristics of sensitive loads lead to huge risks in the power usage of sensitive customers

For such customers, even a slight power quality problem can lead to serious economic losses

Images