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载波相移pwm     
相关语句
  carrier phase-shifted pwm
     Cascade multilevel inverter output voltage performance can be improved when carrier phase-shifted PWM technique which can get the high switch frequency effect with real low switch frequency is applied.
     载波相移PWM技术应用于级联型多电平变频器可以在较低的器件开关频率下实现较高开关频率的效果,从而提高其输出性能,但是不同的载波相移角度,输出性能并不完全一样,因此对载波相移PWM技术的相移角度同级联型多电平变频器输出性能进行了研究。
短句来源
  carrier-shifted pwm
     The relationship between the carrier-shifted PWM and the space vector PWM in flying capacitor multilevel inverters is established, and according to the relationship, the switching loss minimized PWM for flying capacitor multilevel inverters is presented, the switching loss can be greatly reduced and efficiency of the system can be improved. Three kinds of novel PWM methods are researched theoretically in the thesis, which utilizes vertical offsets among carriers of the CFD and horizontal offsets among carriers of the CFD.
     为了使飞跨电容三电平逆变器PWM控制方法的研究具有系统性和理论性,本文建立了载波相移PWM方法和空间矢量PWM方法之间的联系,在此基础上提出了飞跨电容三电平逆变器开关损耗最小PWM方法,该方法很大程度地减少了开关损耗,提高了系统的效率。
短句来源
  carrier-shifting pwm
     A relationship between a carrier-shifting PWM and a space vector PWM in flying capacitor multilevel inverters are established, and according to the relationship, the switching loss minimized PWM for flying capacitor multilevel inverter is presented.
     该文在理论分析的基础上建立了飞跨电容多电平逆变器载波相移PWM方法和空间矢量PWM方法之间的联系,并以此为依据,提出了飞跨电容多电平逆变器开关损耗最小PWM方法。
短句来源
     In a comparison with conventional carrier-shifting PWM method, every phase of the flying capacitor multilevel inverter can have the 120?
     与传统的载波相移PWM方法相比,该方法使飞跨电容多电平逆变器每相输出在一个开关周期内有120°不开关区域;
短句来源
  a carrier-shifting pwm
     A relationship between a carrier-shifting PWM and a space vector PWM in flying capacitor multilevel inverters are established, and according to the relationship, the switching loss minimized PWM for flying capacitor multilevel inverter is presented.
     该文在理论分析的基础上建立了飞跨电容多电平逆变器载波相移PWM方法和空间矢量PWM方法之间的联系,并以此为依据,提出了飞跨电容多电平逆变器开关损耗最小PWM方法。
短句来源

 

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    A relationship between a carrier-shifting PWM and a space vector PWM in flying capacitor multilevel inverters are established, and according to the relationship, the switching loss minimized PWM for flying capacitor multilevel inverter is presented. In a comparison with conventional carrier-shifting PWM method, every phase of the flying capacitor multilevel inverter can have the 120?no switching zone in one period by the proposed method; according to power factor angle, 120°

    该文在理论分析的基础上建立了飞跨电容多电平逆变器载波相移PWM方法和空间矢量PWM方法之间的联系,并以此为依据,提出了飞跨电容多电平逆变器开关损耗最小PWM方法。与传统的载波相移PWM方法相比,该方法使飞跨电容多电平逆变器每相输出在一个开关周期内有120°不开关区域;根据负载的功率因数角,通过调整注入的零序电压,使120°不开关区域最大程度地位于负载电流的最大处,因此该方法大大减小了开关损耗,提高了系统的效率。仿真和实验结果证明了该方法的正确性和可行性。

    In this paper, cascade H-bridge converter with carrier phase-shifted SPWM technique(CPS-SPWM) has been proposed, which is the combination of cascade structure and CPS-SPWM technique. High equivalent switching frequency can be obtained with low switching frequency devices. Such advantages as simple structure, wide bandwidth and good transient response can be obtained in large power equipment. This converter has been applied in shunt active power filter(APF). In applied system of shunt active power filter, the...

    In this paper, cascade H-bridge converter with carrier phase-shifted SPWM technique(CPS-SPWM) has been proposed, which is the combination of cascade structure and CPS-SPWM technique. High equivalent switching frequency can be obtained with low switching frequency devices. Such advantages as simple structure, wide bandwidth and good transient response can be obtained in large power equipment. This converter has been applied in shunt active power filter(APF). In applied system of shunt active power filter, the advantage of cascade multilevel converter is put forth sufficiently because of no need for active power on DC bus. Moreover, the excellent signal-transmitting feature of Carrier Phase Shifted PWM is also employed all right. Simulation and Experiment result proves that the shunt APF system with cascade multilevel converter based on Carrier Phase Shifted PWM can achieve excellent compensation effect at much low switch frequency, which is of perfect prospect in industry application.

    提出了基于CPS-SPWM技术的级联H桥型多电平变流器,它是CPS-SPWM技术与级联H型变流器拓扑结构的结合。这种变流器能在较低的器件开关频率下实现较高等效开关频率的效果,具有结构简单、传输频带宽、动态响应好等优点。文中将这种变流器用在有源电力滤波器这样大功率场合,在并联有源电力滤波器系统中,由于直流侧不需要提供有功功率,级联型多电平变流器的优势可以得到充分的发挥;而载波相移PWM技术良好的谐波传输特性也可以得到良好的利用。仿真和实验结果表明基于CPS-SPWM技术级联 H桥型多电平变流器的SAPF系统能够在较低的器件开关频率下实现较好补偿效果,具有良好的工业应用前景。

    Some kinds of control strategies are introduced in detail,which are applied to cascade multilevel converter.Their advantages and disadvantages are compared and analyzed,too.Subsection SPWM control strategy is a good method,which combines the advantage of step modulation and carried shift PWM modulation able to reduce switch waste and have better performance of the output waveform.Finally,harmonic spectrums are given and the feasibility of subsection SPWM is proved.

    介绍了阶梯波、载波相移脉宽调制和分段SPWM调制等几种级联型多电平变流器的控制策略,并对它们的优缺点进行了分析和比较,并指出了分段SPWM控制策略是另外两种方法的一种折中方案,它综合了阶梯波和载波相移PWM调制方法的优点,既可以减少开关损耗,又可以使得输出波形性能满足要求。最后给出了几种控制策略产生的输出波形的谐波频谱,验证了分段SPWM方案的可行性和分析的正确性。

     
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