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Guan, Quanxue,Yang, Ping,Guan, Quansheng,Wang, Xiaohong,Wu, Qinghua The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
Large magnitude common-mode voltage (CMV) and its variation dv/dt have an adverse effect on motor drives that leads to early winding failure and bearing deterioration. For matrix converters, the switch states that connect each output line to a different input phase result in the lowest CMV among all of the valid switch states. To reduce the output CMV for matrix converters, this paper presents a new space vector modulation (SVM) strategy by utilizing these switch states. By this mean, the peak value and the root mean square of the CMV are dramatically decreased. In comparison with the conventional SVM methods this strategy has a similar computation overhead. Experiment results are shown to validate the effectiveness of the proposed modulation method.
An SVD-based SVM with Common-mode Voltage Reduction for Direct Matrix Converters
Quanxue Guan,Xiaohong Wang,Zhuoli Zhao,Lina Wang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a new space vector modulation (SVM) strategy is presented to reduce the output common-mode voltage (CMV) for direct matrix converters. This method modifies the traditional singular value decomposition modulation to enable the usage of switch vectors with 120? phase shift, then substitutes two of the corresponding switch states by an orientation switch state which connects every input to one output phase. Since those orientation switch states have zero CMV at the output side of matrix converters, by this mean, not only the peak value but also the voltage transitions of the CMV are decreased dramatically. Besides, the improvement of the modulation can be implemented by some minor modification in software, and thus not additional costs in hardware are needed. imulation results are shown to corroborate the effectiveness of the proposed method. Index Terms?Common-mode Voltage, Matrix Converters, Singular Value Decomposition, Space Vector Modulation
Quanxue Guan,Ping Yang,Quansheng Guan,Xiaohong Wang,Qinghua Wu 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3
Large magnitude common-mode voltage (CMV) and its variation dv/dt have an adverse effect on motor drives that leads to early winding failure and bearing deterioration. For matrix converters, the switch states that connect each output line to a different input phase result in the lowest CMV among all of the valid switch states. To reduce the output CMV for matrix converters, this paper presents a new space vector modulation (SVM) strategy by utilizing these switch states. By this mean, the peak value and the root mean square of the CMV are dramatically decreased. In comparison with the conventional SVM methods this strategy has a similar computation overhead. Experiment results are shown to validate the effectiveness of the proposed modulation method.
Z-domain modeling of peak current mode control for full-bridge DC-DC buck converters
Wang, Xiaohong,Huang, Qisong,Zhang, Bo,Chen, Di,Guan, Quanxue The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1
Traditional local-averaged state-space modeling for peak current mode (PCM) controls fails to explain the subharmonic oscillation phenomenon when the spectrum is higher than half of the switching frequency. To address this problem, this paper presents a small-signal modeling method in the z-domain, and builds a discrete linear model for the current loop of a full-bridge DC-DC converter. This discrete model is converted into a second-order continuous model that is able to represent the system performance with a wider frequency range. A frequency-domain analysis shows that this model can be used to explain the subharmonic oscillations and unstable characteristics. This provides an engineering guideline for the practical design of slope compensation. The effectiveness of the proposed modeling method has been verified by simulation and experimental results with a prototype working in the Buck mode.