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Harmonic impedance measuring device of tractive power supply system and test method of device

A traction power supply system, harmonic impedance technology, applied in measuring devices, measuring resistance/reactance/impedance, measuring electrical variables, etc., can solve the problems of high voltage equipment burning of protectors and arresters, protection malfunction, and harmonic instability.

Active Publication Date: 2017-10-13
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Judging from the operation of high-speed railways in recent years, stability problems such as harmonic resonance, harmonic instability, and low-frequency network voltage oscillations have been frequently reported on the railway site, resulting in traction blockade of traction power supply systems, protection malfunctions, protectors, Burnout of high-voltage equipment such as lightning arresters, continuous amplification of harmonic voltage / current amplitude, serious distortion, and instability of locomotive control loops have seriously affected the reliability of power supply and the safe operation of railways.
[0003] At present, most of the analysis and research on this kind of stability problem is based on the idea of ​​impedance analysis, because the mismatch between the impedance of the traction power supply system and the impedance of the VSC equipment will make the system unstable

Method used

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  • Harmonic impedance measuring device of tractive power supply system and test method of device
  • Harmonic impedance measuring device of tractive power supply system and test method of device
  • Harmonic impedance measuring device of tractive power supply system and test method of device

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Embodiment 1

[0028] Embodiment 1: adopt as figure 1 The basic circuit shown, in which the step-down transformer adopts a single-phase isolation transformer; the voltage sensor TV adopts a Hall voltage sensor, whose model is CHV-50P; the current sensor TA uses a Hall current sensor, whose model is LA-50P; the rectifier UR adopts a single-phase uncontrolled rectification circuit; the supporting capacitor is an electrolytic capacitor; the driving and protection circuit Q adopts figure 2 In the scheme shown, the core part is the KA962 driver chip; the AC voltage and current signal conditioning circuit SC adopts such as image 3 The scheme shown; the monitoring and control module MC is realized by DSP controller or other microprocessors in actual implementation.

[0029] The test method for the harmonic impedance measuring device of the traction power supply system is as follows: Figure 5 Shown:

[0030] 4. Including the following main steps:

[0031] A. Device threshold setting: the step-d...

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Abstract

The invention discloses a harmonic impedance measuring device of a tractive power supply system and a test method of the device. The device can obtain relatively complete voltage and current harmonic characteristics of the tractive power supply system by carrying out disturbance test on the tractive power supply system only once, and further obtain accurate harmonic impedance characteristic of the tractive power supply system; the characteristics can be displayed in a display screen in real time; and data and technology support is provided for harmonic resonance and stability analysis of the tractive power supply system on the basis of an impedance analysis method.

Description

Technical field: [0001] The invention relates to the field of impedance measurement of rail transit traction power supply system, especially the harmonic impedance measurement technology of traction power supply system. Background technique: [0002] As of January 2016, the mileage of high-speed railways in my country has exceeded 19,000 kilometers, accounting for more than 60% of the world's total mileage. busy country. Judging from the operation of high-speed railways in recent years, stability problems such as harmonic resonance, harmonic instability, and low-frequency network voltage oscillations have been frequently reported on the railway site, resulting in traction blockade of traction power supply systems, protection malfunctions, protectors, Burnout of high-voltage equipment such as lightning arresters, continuous amplification and serious distortion of harmonic voltage / current amplitude, and instability of locomotive control loops have seriously affected the reliab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R23/16
Inventor 胡海涛潘鹏宇何正友杨孝伟周毅
Owner SOUTHWEST JIAOTONG UNIV
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