Third-order resistance wave base high-pass filter device and electric power supply system with same

Abstract

The invention relates to a third-order resistance wave base high-pass filter device and an electric power supply system with same. The device can be used for a rail traction power supply network, a common direct-current, single-phase and three-phase power supply systems. The filter device is formed by connecting a capacitor C2 with an electric reactor L in series, with a capacitor C1 in parallel and finally with a resistor R in series. In a rail traction power supply system, the third-order resistance wave base high-pass filter device is connected between a contact line T and the ground; in a single-phase power supply system, the third-order resistance wave base high-pass filter device is connected between a phase line and a null line; in a three-phase power supply system, the three filter devices are connected with three phase lines in the system by adopting a Y-type connecting method or a triangular mode. The device can be used for effectively avoiding external exchange of reactive power, and avoiding parameter changes due to inductance saturation caused by direct-current components due to various reasons in the line with the existence of the capacitor C2, and does not produce interferences on base wave power supply network parameters. Moreover, the device can be used for direct-current link filtering of high-voltage direct-current power supply. The filter device has wide application.

Description

technical field [0001] The invention relates to the technical field of high-order harmonic filtering for electrified railway power supply and single-phase or three-phase power supply network, in particular to a third-order fundamental-wave-resistance high-pass filter device and an electric power supply system with the filter device. Background technique [0002] With the rapid development of domestic electrified railways, the traditional AC-DC electric locomotives are replaced by more and more AC-DC-AC high-power high-speed electric locomotives. The rectifier of the traditional AC-DC rectification electric locomotive is generally a thyristor phase-controlled rectifier, which makes it obtain power frequency power from the power supply network and inject harmonics into the power grid at the same time, of which 3, 5, 7, 9, etc. Low-frequency high-order harmonics are dominant. The AC-DC-AC electric locomotive adopts a four-quadrant converter controlled by pulse width modulation...

AI Technical Summary

Problems solved by technology

[0003] The first-order, second-order, third-order and C-type high-pass filters are commonly used to filter out high-order harmonics. The advantages of the first-order high-pass high-pass filter are simple structure, low cost, and convenient operation and maintenance. The disadvantage is power frequency power loss Large; the filtering performance of the second-order high-pass filter is good, but compared with the third-order, the fundamental wave loss is still relatively high

The third-order high-pass filter has one more capacitor than the second-order, which greatly reduces the fundamental wave loss, but its structure is complex and parameter design is difficult

C-type filter can greatly reduce fundamental wave loss, but it is sensitive to fundamental frequency detuning parameter drift

It should be noted that the above four high-pass filters have reactive AC

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