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- 저자 : Jiamin Guo (검색결과 2 건)
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Hybrid phase-shifted modulation method for hybrid cascaded H-bridge inverters
Hu, Wenhua,Guo, Jiamin,Liu, Jianfeng,Yuan, Yisheng The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
Due to its unreasonable DC voltage distribution, the phase-shifted pulse width modulation (PS-PWM) method cannot be directly applied to equal-ratio and equal-difference hybrid CHB inverters. Thus, these types of inverters lose the double-frequency characteristic of the CHB topology. To preserve this double-frequency characteristic, reduce the switching frequency of the high-voltage cells, and simplify the modulation method. This article proposes an optimized topology for the hybrid CHB inverter by optimizing the distribution of the DC voltage. A hybrid PS-PWM method is also proposed by combing the step-wave modulation method and the PS-PWM method. Theoretical analysis, simulation analysis, and experimental results show that the optimized topology and the hybrid PS-PWM method are both valid and feasible.
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Gongxing Wu,Jiawei Zhang,Guofu Li,Linling Wang,Qiang Yu,Jiamin Guo 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
In order to solve the difficulty of modeling the unmanned surface vehicle (USV) nonlinear maneuver model, a combination identification method of linear hydrodynamic coefficients and nonlinear hydrodynamic coefficients based on support vector machine (SVM) is proposed. The identification principle of USV hydrodynamic coefficients is briefly introduced and a regression algorithm of the SVM is derived for the USV maneuver model. Then, the linear hydrodynamic coefficients of the hull are identified by using a series of USV turning test data at small water-jet angles. And the large water-jet angle turning motion test data and the identified linear hydrodynamic coefficients are used to identify the nonlinear hydrodynamic coefficients for USV. The fourth-order Runge-Kutta method is used to design the USV maneuver simulation program, and a series of USV turning motion simulation experiments are carried out. The simulation data is compared with the corresponding USV sea trial data. Through comparative analysis, it is shown that the USV maneuver mathematical model established in this paper can describe the maneuverability of the USV. It is feasible to use the combination method of SVM to identify the hydrodynamic coefficient of USV.
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