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Normalized nonlinear PWM carrier modulating method of current transformer

A carrier modulation and nonlinear technology, which is applied in the field of normalized nonlinear PWM carrier modulation of converters, can solve the problems such as the inability to automatically adjust the amplitude of the carrier, interference, etc., so as to improve the utilization rate of DC voltage and reduce the capacity. , the effect of eliminating ripple

Inactive Publication Date: 2009-12-02
SHANGHAI MARITIME UNIVERSITY +1
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AI Technical Summary

Problems solved by technology

[0006] The most important feature of the above carrier modulation method is that the amplitude of the carrier cannot be automatically adjusted according to the voltage of the DC bus, and the carrier information does not contain the relevant information of the DC bus voltage ripple, so it is difficult to eliminate the DC bus voltage ripple of the converter simply and in real time. Wave interference on the output of the converter

Method used

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  • Normalized nonlinear PWM carrier modulating method of current transformer

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Embodiment Construction

[0021] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0022] refer to figure 1 , first sample the DC bus voltage to generate a voltage sampling signal U dc , the sampling signal U dc After low-pass filtering, the average sampled signal U is generated dc .

[0023] Sampling signal U dc Divide by the average sampled signal U dc , get the normalization factor ξ.

[0024] The normalization factor ξ reflects the relationship between the DC bus voltage of the DC bus voltage and the ripple of the DC bus voltage.

[0025] Multiply the original carrier signal V by the normalization factor ξ carrier * , get the nonlinear carrier signal V carrier . and with a nonlinear carrier signal V carrier Replace the original carrier signal V of the original equipment carrier * .

[0026] The above process ...

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Abstract

The invention relates to a normalized nonlinear PWM carrier modulating method of a current transformer, which belongs to a PWM carrier modulating method of the current transformer, in particular to a nonlinear PWM carrier modulating method of the current transformer. In the method, a feed-forward signal is introduced into direct current bus voltage and is used for processing an original carrier signal, thereby realizing the normalized nonlinear PWM carrier modulation and effectively eliminating the influence brought by ripples on a direct current bus to output control in real time; the method reduces the capacity of a flat wave filter capacitor and the hardware cost; and the method effectively improves the direct current voltage utilization rate of the current transformer, thereby improving the efficiency, power density and integration degree of the current transformer.

Description

technical field [0001] The invention relates to a PWM carrier modulation method of a converter, in particular to a nonlinear PWM carrier modulation method of a converter. Background technique [0002] With the development of power electronic technology, various AC / DC, DC / AC, AC / AC, DC / DC and AC / DC / AC power electronic conversion technologies with high efficiency and high power density have attracted more and more attention. The above-mentioned types of power electronic converters adopt the following methods when using the carrier comparison method for pulse width modulation. [0003] 1. Single triangle carrier or sawtooth carrier modulation method. This method is to compare the modulation signal with the triangular carrier or sawtooth carrier signal that does not change in frequency and waveform, and obtain the desired PWM control signal to drive the power switch tube. [0004] 2. Sawtooth carrier modulation method with waveform change. This method is based on the control ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/44H02M7/527H02M7/5395
Inventor 吴卫民
Owner SHANGHAI MARITIME UNIVERSITY
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