Waveform modulation method and device based on space voltage vector
A technology of space voltage vector and reference voltage vector, applied in the field of vector modulation, can solve the problems of not considering the polarity of the line voltage, optimizing the synchronous modulation effect is not good, and can not well suppress the output harmonic current of the three-phase inverter. , to achieve the optimization effect, improve the suppression, and optimize the effect of output harmonics
Active Publication Date: 2016-12-21
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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[0003] At present, the commonly used optimized synchronous modulation method is based on the optimization method based on the minimum effective value of the harmonic output harmonic current of the inverter. Modeling is based on the output voltage waveform of the single-phase bridge arm of the three-phase inverter, and the output voltage waveform of each phase is obtained. For the three-phase inverter, the overall operating characteristics of the three-phase inverter cannot be intuitively obtained, and factors such as whether the polarity of the line voltage is consistent and whether two or more bridge arms are simultaneously operated are not considered. The impact on the output characteristics of the three-phase inverter, so based on the optimized switching angle obtained for each phase, the output voltage waveform of the inverter can not be well suppressed to suppress the output harmonic current of the three-phase inverter, and optimize the synchronous modulation Ineffective
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[0051] 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 making creative efforts belong to the protection scope of the present invention.
[0052] The terms "first", "second" and the like in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is merely a description of the manner in which objects with the same attribute are described in the embodi...
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The invention discloses a waveform modulation method based on a space voltage vector. The waveform modulation method comprises the following steps of acquiring a frequency f and a base wave peak U1 of a reference voltage vector; calculating a modulation ratio m according to the base wave peak U1, and acquiring a vector switching frequency k according to the frequency f; acquiring a vector sequence and an optimal switch angle which are corresponding to minimum harmonic current value output from a three-phase inverter by building a space voltage vector sequence according to the modulation ratio m and the vector switching frequency k; comparing a phase angle of the reference voltage vector with the optimal switch angle corresponding to each vector in the vector sequence; and modulating an output voltage waveform of the three-phase inverter by controlling an on / off state and acting time of a switch of a three-phase inverter switch device according to a comparison result. By optimizing an output harmonic of the three-phase inverter, the capability of outputting a harmonic current of the three-phase inverter is suppressed, and optimal synchronous modulation is more accurate.
Description
technical field [0001] The invention relates to the field of vector modulation, and more specifically relates to a waveform modulation method and device based on a space voltage vector. Background technique [0002] For the commonly used two-level inverter topology, space voltage vector modulation (SVPWM) is a pulse width modulation wave generated by the switching mode composed of six power switch tubes of the three-phase inverter. The basic idea is to use the three-phase The seven discrete space voltage vectors generated by the inverter are used to fit any required reference voltage vector to achieve the purpose of outputting the reference voltage. Since there are harmonics in the output voltage of the inverter, as the carrier ratio decreases, the output harmonics will become larger, and the control performance of the motor will deteriorate. It is necessary to use synchronous modulation to optimize the output voltage harmonics of the inverter. [0003] At present, the comm...
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Login to View More IPC IPC(8): H02M7/48
CPCH02M7/48H02M1/0003
Inventor 冯江华张朝阳许峻峰刘可安尚敬郑汉锋文宇良
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST