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http://hdl.handle.net/11375/24737
Title: | Model Predictive Control for Permanent Magnet Synchronous Motor Drives with Improved Techniques to Minimize Current Ripples |
Authors: | Zhao, Guanghan |
Advisor: | Emadi, Ali |
Department: | Electrical and Computer Engineering |
Publication Date: | 2019 |
Abstract: | Permanent Magnet Synchronous Motor (PMSM) is widely used in many industrial applications such as electric vehicles, industrial robotics and servo machines due to the merits of low volume, light weight, high efficiency, and high power density, etc. Finite Control Set Model Predictive Control (FCSMPC), as an advanced and promising control scheme, has attracted more and more attention in its use for PMSM drives due to its notable advantages like fast dynamic response, the ability of multi-variable control and the flexibility to include multiple constraints. However, the FCSMPC scheme suffers from certain drawbacks of large current ripples, which will lead to unexpected torque ripples and noise in the PMSM drive system. This thesis presents two FCSMPC methods for PMSM drives with improved techniques to minimize the current ripples. First, an improved FCSMPC with integrated duty cycle and finite virtual voltage vector technique is proposed. The finite control set is expanded by introducing six symmetrically positioned virtual voltage vectors in addition to the six original active voltage vectors while the selected optimal non-zero voltage vector is applied in the regulated proportion of the sampling period according to an efficiently calculated duty ratio. By combining the concept of duty cycle and finite virtual voltage vector in the proposed technique, the control accuracy is distinctly improved while the current ripples are effectively reduced for the FCSMPC-controlled PMSM drives. Second, an improved FCSMPC with continuous virtual voltage vector technique is proposed. At each sampling interval, the proposed technique applies a continuous virtual voltage vector that is realized by at most two suboptimal basic non-zero voltage vectors and one null voltage vector in proper duty cycle ratios. The continuous virtual voltage vector eliminates the error between the reference current and the actual current at each sampling instant and therefore achieves significant current ripple reduction for the FCSMPC-controlled PMSM drives. The effectiveness of both proposed techniques is validated with the reference 5 KW IPMSM drives test bench under different conditions. Additionally, to better evaluate the effectiveness of the proposed techniques on reducing the current ripple, two conventional techniques are introduced and implemented with the reference IPMSM drives under the same conditions. It is found in the experimental results that the FCSMPC with the proposed techniques achieve better steady-state performance and much lower current ripples while maintaining similar transient responses as compared to the basic FCSMPC and the FCSMPC with conventional techniques. |
URI: | http://hdl.handle.net/11375/24737 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Zhao_Guanghan_finalsubmission201908_MASc.pdf | 3.09 MB | Adobe PDF | View/Open |
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