Analysis method and device for pulse waveform amplitude change

Abstract

An embodiment of the present invention provides a method and device for analyzing the amplitude change of a pulse waveform, wherein the method includes: acquiring the pulse waveform and the number of transition edges of the pulse waveform; determining the size of the first window, so that according to The number of transition edges found by the first window in the pulse waveform is equal to the number of transition edges of the pulse waveform input by the user; slide the first window on the pulse waveform to determine the pulse waveform The position of the jump edge in the waveform and the start coordinates and end coordinates of the jump edge; according to the start coordinates and end coordinates of the jump edge in the pulse waveform, the signal amplitude change of the pulse waveform in unit time volume for statistical analysis. The method and device for analyzing the amplitude change of the pulse waveform provided by the embodiments of the present invention improve the accuracy of analyzing the pulse waveform.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of signal analysis, and in particular, to a method and device for analyzing amplitude changes of pulse waveforms. Background technique [0002] The pulse width modulation (PWM) driving pulse generated by the wind turbine converter is generally a high-frequency differential mode voltage. When it is transmitted from the bottom of the tower to the motor side through a long-distance cable, there will be leakage inductance and coupling Capacitors, high-frequency differential mode voltage will cause voltage reflection on the motor side, causing overvoltage on the motor side, which will easily cause huge damage to the motor. Therefore, filters are usually used in the design to improve the PWM high frequency differential mode voltage characteristics, so as to effectively protect the generator. [0003] When the PWM pulse voltage jumps, the voltage change per unit time is defined as du / dt, and ...

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Problems solved by technology

[0004] At present, there is no automatic method to evaluate the du / dt of the filter, which makes the process of obtaining the starting point and end point of the transition edge and calculating its du / dt only manually, so for a section with 20-30 For the PWM voltage waveform of a transition edge, the experimenter usually randomly extracts 2-3 transition edges from the entire waveform manually to calculate its du / dt, and calculate the average as the du / dt characteristic of the entire waveform

However, in fact, there is a large error in this du / dt evaluation method, because the du / dt difference of each transition edge in a voltage waveform is relatively large, and the du / dt characteristics of the entire waveform obviously cannot be determined by 2-3 evaluation, thus leading to the problem of lower accuracy

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