Method and device for online detection of electromagnetic compatibility performance of intelligent assembly of transformer substation

Abstract

The invention discloses a method and a device for online detection of electromagnetic compatibility performance of an intelligent assembly of a transformer substation. The method comprises the steps that an off-line impedance of the detected intelligent assembly of the transformer substation is acquired in advance; a high-frequency signal is input into an electric power circuit at an online state, and an online impedance of the detected intelligent assembly of the transformer substation is calculated according to a high-frequency response signal on a power line of the detected intelligent module of the transformer substation; according to variations between the online impedance and the offline impedance, an electromagnetic compatibility performance parameter of the detected intelligent assembly of the transformer substation is calculated; and the device comprises a high-frequency signal source, a high-frequency signal input module, an orthogonal reference signal generation module, a voltage detection module, a current detection module and a micro processor. The method and the device for the online detection of the electromagnetic compatibility performance of the intelligent assembly of the transformer substation disclosed by the invention can effectively detect a damage degree of a power source filter at an equipment power source terminal, can be used for monitoring of anti-conducted interference performance of electronic equipment such as the intelligent assembly of the transformer substation as well as monitoring and suppression of conducted interference of a new-energy electric-energy conversion device, and are advantageous in convenient utilization and broad applications.

Description

technical field [0001] The invention relates to a substation electromagnetic compatibility performance detection technology, in particular to an on-line detection method and device for the electromagnetic compatibility performance of a substation intelligent component. Background technique [0002] With the rapid development of smart grid construction, wind power, solar energy and other new energy development and grid connection, the rise of electric vehicles and other industries, a large number of power electronic converters have been put into use. Power electronic converters not only generate power harmonics, but also affect the power quality of the grid; the high-speed switching action of the IGBT will generate high dv / dt, di / dt, and shutdown surge overvoltage, which is harmful to sensitive electronic equipment in the grid (such as Substation smart components, photoelectric transformers, etc.) form conducted electromagnetic interference, and may even directly damage sensi...

AI Technical Summary

Problems solved by technology

However, in the long-term operation process, due to the influence of various factors such as the electromagnetic environment, climate temperature changes, and pollution, the component parameters of the power filter device will inevitably change due to aging and other reasons. Inhibition performance deteriorates, leading to a decline in electromagnetic compatibility performance, which brings hidden dangers to the safe operation of the power grid

[0003] At present, there is still a lack of online detection methods for the high-frequency characteristics of the equipment. When the electronic equipment in the substation has a problem of conducted electromagnetic interference, it is often impossible to quickly and accurately detect the cause of the interference problem, and it is difficult to quickly troubleshoot the problem.

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