Method and apparatus for modulating space vector pulse width
A space vector pulse width, space vector technology, applied in output power conversion devices, electrical components, irreversible DC power input into AC power output and other directions, can solve the increase of harmonic content and the reduction of DC bus voltage utilization. , affecting the effect of pulse width modulation, etc., to reduce common mode components, improve bus voltage utilization, and improve system efficiency
Active Publication Date: 2012-11-14
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology
In this method, although better common-mode voltage characteristics can be obtained, because only part of the basic vectors are selected, the utilization rate of the DC bus voltage is reduced, and the content of various harmonics is increased, which affects the effect of pulse width modulation.
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0047] See figure 1 , is a flow chart of a space vector pulse width modulation method provided in Embodiment 1 of the present invention, including:
[0048] S100. Equivalently inject a harmonic component into the output of the inverter. Its implementation may be: adding a harmonic component to the modulated wave.
[0049] S101. Calculate the action time of each space vector of the synthesized inverter output voltage space vector, including: the action time T of t...
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The invention relates to a technology for modulating a pulse width, and discloses a method and an apparatus for modulating a space vector pulse width. The main concept of the method provided by the invention is that: a harmonic component is equivalently injected into an output of an inverter; action time of a redundancy small vector is allocated, so that an instantaneous common-mode voltage component output from the inverter is mutually canceled out with the instantaneous common-mode voltage component of the harmonic component which is equivalently injected into the output of the inverter, thereby eliminating the instantaneous common-mode voltage component of the output of the inverter. According to the method, the invention further provides a corresponding apparatus for modulating the space vector pulse width. By adoption of the method provided by the invention, common-mode voltage component in an output voltage of the inverter is effectively reduced, high utilization of a DC (Direct Current) busbar voltage is kept, and efficiency of the system is improved.
Description
technical field [0001] The invention relates to pulse width modulation technology, in particular to a space vector pulse width modulation method and device. Background technique [0002] Space Vector Pulse Width Modulation (SVPWM) technology is based on the ideal flux circle of the stator of the three-phase symmetrical motor when the three-phase symmetrical sine wave voltage is supplied as the reference standard, and the actual output generated by different switching modes of the converter. The magnetic flux approaches the reference circular magnetic flux, and the switching of the converter is determined by the result of their comparison, forming a PWM waveform. [0003] The traditional SVPWM technology mainly regards the input differential mode signal as the modulation object, and its output PWM common mode voltage is not used as the control object. Causes adverse effects such as increased ground leakage current and serious electromagnetic interference. [0004] In the pa...
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CPCH02M7/53871H02M7/48H02M2007/53876H02M7/487H02M1/123H02M7/53876
Inventor 张镇刘云峰刘小琴
Owner HUAWEI DIGITAL POWER TECH CO LTD