An auxiliary converter control system and method based on pulse density
An auxiliary converter and pulse density technology, applied in the direction of AC power input conversion to DC power output, output power conversion device, climate sustainability, etc., to improve stability, improve output waveform quality, and reduce peak EMI Effect
Active Publication Date: 2022-06-07
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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[0004] Therefore, how to solve the technical problem of an auxiliary converter control system and its control method based on pulse density, at the same time, the control system and its control method have good noise suppression, and can reduce the input grid and electrical equipment. There are still huge difficulties in improving the stability of train operation due to electromagnetic interference
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[0049] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0050] Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, the present application can also be applied to the present application according to these drawings without any creative effort. other similar situations. ...
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The present invention proposes a pulse density-based auxiliary converter control method, including: signal acquisition step: collecting the output voltage of the auxiliary converter, and outputting the attenuation voltage through the attenuation link; voltage-frequency compensation step: according to the attenuation voltage and preset Jointly adjust the reference voltage and the average value of the switching frequency of the preset power device, output the sampling frequency, perform voltage-frequency compensation on the preset reference voltage according to the sampling frequency, and output the reference voltage; comparison step: perform unit delay on the attenuation voltage, and output the attenuation delay voltage , according to the comparison between the reference voltage mixed with random noise and the decay delay voltage, the difference between the output reference voltage and the decay delay voltage; the second-order integration step: perform second-order integration on the difference between the reference voltage and the decay delay voltage, and output the integral voltage signal ; Quantization step: comparing the integral voltage signal with zero value, suppressing the low-frequency noise of the integral voltage signal, and outputting the driving signal after pulse density modulation, realizing the modulation method based on pulse density.
Description
technical field [0001] The invention relates to the field of auxiliary converter voltage modulation, in particular to a pulse density-based auxiliary converter control system and a control method thereof. Background technique [0002] At present, the train auxiliary converter converts high-voltage DC power into three-phase AC power, which is supplied to the vehicle's AC load. The conventional auxiliary converter adopts the pulse width modulation (PWM) method, figure 1 It is a schematic diagram of the prior art pulse width modulation method, such as figure 1 shown. The fixed frequency triangular wave is used as the carrier wave, and the DC or sine wave is used as the modulating wave, and the two are compared to obtain a pulse signal of equal height and unequal width and a fixed fundamental frequency, which is used to drive the power device. After demodulation through a low-pass filter, the ideal three-phase AC voltage is obtained. [0003] However, the pulse signal obtain...
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IPC IPC(8): H02M7/5387H02M7/5395H02M1/44
CPCH02M7/53875H02M7/5395H02M1/44Y02B70/10
Inventor 李骄松曾凡飞马法运夏猛曹虎
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST