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Research on Bridge-type Passive Lossless Three-Phase PWM Inverters

Author: HanZuo
Tutor: FengJian
School: Northeastern University
Course: Proceedings of the
Keywords: Soft-switching Passive Lossless PWM control Inverter
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 85
Quote: 0
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Abstract


In recent years, with the development of the PWM inverter, power converter design a fundamental change from the bulky and large frequency transformer into a small size, light weight, high-density power converters, the overall efficiency of the converter also greatly improved, which is conducive to design and promote the application of the PWM inverter. However, with the increase of China's industrial development and energy demand, energy efficient inverter has become a focus for researchers. Traditional inverter technology is mature, reliable, and widely used, but there is a large volume, audible noise, poor shortcomings of system dynamics, the design of the power inverter soft-switching technology is considered to be a state-of-the-art technology. In order to address the loss of traditional buffer circuit proposed lossless soft-switching technology, according to the presence or absence of auxiliary switching devices, lossless soft-switching technology is divided into active lossless soft-switching technology and passive lossless soft-switching technology. Although active lossless snubber circuit can reduce the switching losses are more complex, but the structure and control. Passive lossless soft-switching technology can not only reduce the switching losses weaken noise, and the circuit is simple, low cost, high reliability, and in recent years has been widespread concern and research. Soft switching inverter control resonant process through the auxiliary switching devices, the control method is complex and not easy to achieve. This paper studied an absorbent soft-switching topology, zero current turn of the main switch off and zero-voltage characteristics of this circuit topology share the same bridge arm tube opened absorption inductance and off snubber capacitor, optimized on the basis of the structure of the main absorbent, adding a small amount of the inductor and the diode element, and minimize additional element, the voltage source again capacitor structure, to achieve the energy feedback and absorption element reset. On the basis of analyzing the compilation of relevant research literature, development of soft-switching inverter technology now and like to make a more detailed overview, thesis research work are as follows: First, a passive non-destructive analysis of three-phase PWM inverter 's topology, switch state analysis of the working principle and process of this topology. Establish a mathematical model and solving for the main parameter values. This circuit can achieve soft switching of the switching device is verified by theoretical analysis and energy feedback, and provides a theoretical basis for follow-up studies. Secondly, through the analysis of this soft switch working conditions of the circuit design SPWM control strategy, as long as the the tune system meets the conditions of the zero-voltage switching and zero-current switching, the switch will be able to achieve soft switching. The subsequent three-phase passive lossless soft-switching inverter simulation study, a comparative analysis of simulation results with traditional inverters, structure and spectrum analysis to verify the correctness of the control strategy through simulation. Finally, it is pointed out that the existing problems in theoretical research and practical application, the prospect for further research.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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