The Research Of SVPWM Modulation Method In Three-phase Inverter

Three-phase inverter is widely used in our daily life. Various modulation method and control strategy is the researching hot pot so along, in order to obtain excellent output waveform. After Solving these problems, how to improve the inverter power density and reliability has been the research focus. Different modulation method corresponds to different switch frequency, Obviously, the machine's power loss is largely effected by it. At the same time, different modulation method generated different high-frequency harmonic, and high-frequency harmonic is an important aspect of the loss inside magnetic device.This paper established the three-phase inverter in dq rotating coordinate system, based on the mathematical equations, analyzes the dq rotating coordinate coupled condition, and introduces the rotation of the coordinate below electric circuit.and the outer ring of voltage control technology. Then analyzes the principle of implementing SVPWM modulation strategy in detail, and on this principle deduced the SVPWM engineering method, which can be easily achieve.Then discussed the SPWM modulation strategies and implementing SVPWM modulation schemes through the dual Fourier integral method for quantitative analysis of the two kinds of modulation method harmonic content difference. And on the basis of harmonic calculation, calculated dc current and harmonic current numerical and harmonic frequency on the dc side of inverter, in the last ,we make the simulation in MATLAB software simulation tool to got relative validation. Through analyzing harmonic content are making an important role in magnetic device internal loss analysis in the future.For implementing SVPWM modulation, built the experimental prototype and writing the corresponding program for it. With the experiment, we analysis the output waveform of harmonic content. Also made the corresponding axon add axon enquiring load experiment, also made the corresponding no-load to loading experiment, experiment shows that inverter control is steadily.