By deriving the discrete-time models of a digitally controlled H-bridge inverter system modulated by bipolar sinu- soidal pulse width modulation （BSPWM） and unipolar double-frequency sinusoidal pulse width modulati...By deriving the discrete-time models of a digitally controlled H-bridge inverter system modulated by bipolar sinu- soidal pulse width modulation （BSPWM） and unipolar double-frequency sinusoidal pulse width modulation （UDFSPWM） respectively, the performances of the two modulation strategies are analyzed in detail. The circuit parameters, used in this paper, are fixed. When the systems, modulated by BSPWM and UDFSPWM, have the same switching frequency, the stabil- ity boundaries of the two systems are the same. However, when the equivalent switching frequencies of the two systems are the same, the BSPWM modulated system is more stable than the UDFSPWM modulated system. In addition, a convenient method of establishing the discrete-time model of piecewise smooth system is presented. Finally, the analytical results are confirmed by circuit simulations and experimental measurements.展开更多
Instead of avoiding occurrence of chaos in motor drives, chaos is positively utilized in this paper. A new chaotic pulse width modulation （PWM） scheme is proposed and implemented for AC motors, which functions to si...Instead of avoiding occurrence of chaos in motor drives, chaos is positively utilized in this paper. A new chaotic pulse width modulation （PWM） scheme is proposed and implemented for AC motors, which functions to significantly suppress harmonic peaks and hence acoustic noise. The key is to employ the Chua＇s circuit for generating a desired chaotic sequence. By using a practical induction motor, computer simulation and experimental results verify that the chaotic PWM has advantages of harmonic peak suppression and simple hardware implementation over the conventional PWM and random PWM.展开更多
高频链矩阵式逆变器(High Frequency Link Matrix Inverter,简称HFLMI)是一类可实现直流侧与交流侧电气隔离的高功率密度变换器,针对矩阵式逆变器的双向开关特征,运用解结耦分析思想,研究了一种新的适用于三相HFLMI的解结耦正弦脉宽调制...高频链矩阵式逆变器(High Frequency Link Matrix Inverter,简称HFLMI)是一类可实现直流侧与交流侧电气隔离的高功率密度变换器,针对矩阵式逆变器的双向开关特征,运用解结耦分析思想,研究了一种新的适用于三相HFLMI的解结耦正弦脉宽调制(SPWM)策略。阐述了所提方案的基本控制思路,详细分析了在前级逆变器高频开关工作周期内高频链逆变电路的工作模态,给出实验结果。相关工作验证了解结耦SPWM的可行性与有效性。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 51277146)the Foundation of Delta Science,Technologythe Education Development Program for Power Electronics (Grant No. DREG2011003)
文摘By deriving the discrete-time models of a digitally controlled H-bridge inverter system modulated by bipolar sinu- soidal pulse width modulation （BSPWM） and unipolar double-frequency sinusoidal pulse width modulation （UDFSPWM） respectively, the performances of the two modulation strategies are analyzed in detail. The circuit parameters, used in this paper, are fixed. When the systems, modulated by BSPWM and UDFSPWM, have the same switching frequency, the stabil- ity boundaries of the two systems are the same. However, when the equivalent switching frequencies of the two systems are the same, the BSPWM modulated system is more stable than the UDFSPWM modulated system. In addition, a convenient method of establishing the discrete-time model of piecewise smooth system is presented. Finally, the analytical results are confirmed by circuit simulations and experimental measurements.
基金Project supported by the Shanghai Leading Academic Discipline Project (Grant No.T0103)
文摘Instead of avoiding occurrence of chaos in motor drives, chaos is positively utilized in this paper. A new chaotic pulse width modulation （PWM） scheme is proposed and implemented for AC motors, which functions to significantly suppress harmonic peaks and hence acoustic noise. The key is to employ the Chua＇s circuit for generating a desired chaotic sequence. By using a practical induction motor, computer simulation and experimental results verify that the chaotic PWM has advantages of harmonic peak suppression and simple hardware implementation over the conventional PWM and random PWM.
文摘高频链矩阵式逆变器(High Frequency Link Matrix Inverter,简称HFLMI)是一类可实现直流侧与交流侧电气隔离的高功率密度变换器,针对矩阵式逆变器的双向开关特征,运用解结耦分析思想,研究了一种新的适用于三相HFLMI的解结耦正弦脉宽调制(SPWM)策略。阐述了所提方案的基本控制思路,详细分析了在前级逆变器高频开关工作周期内高频链逆变电路的工作模态,给出实验结果。相关工作验证了解结耦SPWM的可行性与有效性。
