Device and method for measuring frequency domain impedance of traction power supply system and capable of setting frequency band

Abstract

The invention discloses a device and method for measuring frequency domain impedance of a traction power supply system and capable of setting a frequency band. According to the main structure of the device, a secondary side coil of a step-down transformer (T) is connected in series with a switch (K) and then connected with a disturbance circuit; a microprocessor unit (MPU) is connected to gate pole of an IGBT device in the disturbance circuit through a drive circuit (DC); and the disturbance circuit is mainly composed of the step-down transformer, a diode, the IGBT device and a resistor. The device for measuring frequency domain impedance of the traction power supply system can measure the frequency domain impedance characteristic of the traction power supply system in a set frequency band. The frequency domain impedance measurement of the traction power supply system is carried out by using the device, and the measurement data processing amount is small, the measurement efficiency ishigh, the measured impedance characteristic and resonance frequency precision are high, and the device is more accurate and reliable.

Description

technical field [0001] The invention relates to a frequency-domain impedance measurement device and a measurement method for a traction power supply system. Background technique [0002] By the end of 2016, the total mileage of electrified railways in my country had reached 74,000 kilometers, the electrification rate of railways had reached more than 60%, and the proportion of transportation tasks completed by electric traction exceeded 80%. At the same time, the electrified railway continues to expand at an average annual rate of 6,640 kilometers. It is estimated that by 2030, the electrified railway mileage will reach about 150,000 kilometers. The most important electrical device in an electrified railway is the traction power supply system. The traction power supply system contains a large number of inductive and capacitive components, and the mutual matching of the inductive and capacitive components will bring more resonance points to the traction power supply system. ...

AI Technical Summary

Problems solved by technology

The frequency band of the wide-band disturbance signal generated by the disturbance signal generating device is fixed and cannot be adjusted and controlled; when the frequency band is too wide, it will lead to a large amount of measurement data processing, low measurement efficiency, and low accuracy of the measured impedance characteristics and resonance frequency ; and when the frequency band is too narrow, it will lead to the leakage of the resonant frequency, and the measured impedance characteristics and resonant frequency have low accuracy and poor reliability.

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