DIRECT-DRIVE WIND POWER GENERATOR SYSTEM BASED ON CPS-SPWM FLYING CAPACITOR CONVERTER
IntroductionVariable speed motor drives are being rapidly deployed for a vast range of applications in order to increase efficiency and to allow for a higher level of control over the system1-3. One of the important areas within the field of variable speed constant frequency is direct-drive wind power system. In direct-drive systems significant simplifications result from the elimination of the gear box which has traditionally been used to interface a slowly rotating shaft with the generator shaft. The elimination of the gearbox is important for three reasons. Firstly, the gearbox is a significant cost component in the overall system. Secondly, removing the gearbox eliminates moving parts thereby improving system reliability. Thirdly, removing the gearbox could improve overall system efficiency. The system need full-scale high power converter, such as flying capacitor multilevel converter. On the realization of high power electronic equipment, an important problem is that the working frequency of high power devices is too low to apply excellent modulated technique such as PWM4-6. In large-power equipment, the switching frequency of power electronics devices is such low that good control performance cant be obtained with a single converter. In order to overcome this problem, Carrier phase-shifted SPWM technique (CPS-SPWM) has been researched. Reactive power compensation and harmonic reduction are two relevant research problems that exist in wind power system. With the advancement of modem power electronics technology in both circuits and devices, new and better solutions are being proposed and applied to solve these two problems. To compensate reactive power, a flying capacitor type multilevel inverters with a Carrier Phase-Shifted SPWM(CPS-SPWM) switching scheme is proposed. All this verified by simulation and experiment.
Li Jian-lin Xu Hong-hua
Institute of Electrical Engineering Chinese Academy of Sciences Beijing, China
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
301-302
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）