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Research of Digital Control and Main Circuit of High Power Inverter

Author: LiZuo
Tutor: LiMinYuan
School: Xi'an University of Technology
Course: Pattern Recognition and Intelligent Systems
Keywords: Inverter high power unipolar SPWM multi-loop main circuit
CLC: TM464
Type: Master's thesis
Year: 2009
Downloads: 260
Quote: 1
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Abstract


High power inverter technology is being paid more and more attention in morden power electronics. In order to provide high power for the loads, three-phase inverter can be used as usual. The output voltage of tranditional three-phase four-leg inverter will be dissymmetrical when it supplies to three phase imbalance loads. Three-phase combined inverter can be solving the problem of imbalance. But, if the modulation or control strategies are not fit for the inverter system, the quality of output voltage will be influenced, even if the system will be wasted.Contraposing the problems of high power inverter system, this paper studied modulation mode, multi-loop control strategy and main circuit parameters of inverter system. First, several kinds of modulation modes are studied, based on project problems, selected unipolar SPWM modulation for the inverter system. Second, the characteristics of multi-loop control are analyzed, then the phase feedback loop is added in traditional multi-loop structure to solve the problem of phase imbalance of high power inverter system, and the results of simulation by MATLAB/SIMULINK indicate that, this control strategy can realize phase self-regulation. Third, the parameters of inverter system main circuit are designed; chose the appropriate driver board for experiments by calculating the parameters of the inverter system. TMS320F2812DSP is used to realize 400Hz,115V single phase multi-loop digital controlled inverter, and the driver board used KA962 which is improved by M57962. Three single phase inverter systems are connected to a three-phase combined inverter power system, which with multi-loop control strategy can ensure that the phase difference between every phase of the three-phase combined inverter is 120°.Study results indicate that the inverter system which desgined in this paper can reduce harmonious content of output voltage, and ensure that the phase difference between every phase of the three-phase combined inverter is 120°.

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