A study on the multi-carrier PWM methods for voltage balancing of flying capacitor in the flying capacitor multi-level inverter
A study on the multi-carrier PWM methods for voltage balancing of flying capacitor in the flying capacitor multi-level inverter
复制标题
飞跨电容多电平逆变器中飞跨电容电压平衡的多载波PWM方法研究
DOI：
10.1109/iecon.2005.1568993
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
D. Hyun
中科院分区：
文献类型：
--
作者：
Bumseung Jin;Won;Tae;D. Kang;D. Hyun
在飞行电容多电平逆变器(FCMLI)中，飞行电容电压控制对其安全运行至关重要。飞控电容器的电压不平衡给系统的安全可靠性带来了严重的问题，也限制了FCMLI的应用。电压不平衡是由于施加在FCMLI上的每个电容器的充放电时间不同造成的。本文研究和分析了解决电容电压均衡问题的多载波PWM方法。在FCMLI的各种脉宽调制方法中，对移相脉宽调制(PSPWM)方法、改进的载波重分布脉宽调制(MCRPWM)方法和锯齿旋转脉宽调制(STRPWM)方法从开关状态、电容平衡电压和输出波形等方面进行了讨论和比较。此外，本文还考虑了各种脉宽调制方法的性能。在飞跨电容三电平逆变器中对这三种脉宽调制方法进行了分析。通过仿真和实验，给出了仿真结果。最后，用谐波失真因子(Hdf)比较了这两种方法的输出电压的谐波。
The voltage control of flying capacitor is very important for safe operation in flying capacitor multi-level inverter (FCMLI). The voltage unbalancing of flying capacitor causes serious problems in safety and reliability of system, and also limits FCMLI's applications. The voltage unbalancing is occurred due to the difference of each capacitors charging and discharging time applied to FCMLI. This paper investigates and analyzes multi-carrier PWM methods to solve capacitor voltage balancing problem. Among the various PWM methods for the FCMLI, the phase-shift PWM (PSPWM) method, the modified carrier-redistribution PWM (MCRPWM) method and the saw-tooth-rotation PWM (STRPWM) method are discussed and compared with respect to switching state, balancing voltage of capacitors and output waveform. Also, this paper considers the performance of PWM methods. These three PWM methods are analyzed in the flying capacitor three-level inverter. The results are shown through simulation and experiment. Finally, the harmonics about the output voltages of their methods are compared using the harmonic distortion factor (HDF)