Study on Modified SPWM Control for Rectified Load
碩士 === 國立成功大學 === 電機工程學系 === 104 === This thesis proposes a control method for sinusoidal pulsewidth modulation (SPWM) single-phase inverters with rectified loads. The classical SPWM is not effective in compensating the harmonics and the distortion caused specifically by the nonlinear currents drawn...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/52213893560026287782 |
| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 104 === This thesis proposes a control method for sinusoidal pulsewidth modulation (SPWM) single-phase inverters with rectified loads. The classical SPWM is not effective in compensating the harmonics and the distortion caused specifically by the nonlinear currents drawn by the rectified loads. The characteristics of rectified loads are analyzed and discussed. In order to determine the severity of the impact of rectified loads, it is necessary to identify parameters of rectified loads. By sensing the output current, the first conduction switching cycle of the bridge rectifier can be found to adjust the pulsewidth in advance for inrush current suppression. The proposed control strategy is verified by simulation and experiment. The results of simulations and experiments demonstrate that the parameters of rectified loads can be estimated effectively, and the proposed controller successfully achieves reducing the inrush current and the current crest factor.
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