不同母线钳位PWM的对比研究  

Contrastive research on different bus_clamping PWM methods

作　　者：崔琳[1] 陈阳生[1] 

机构地区：[1]浙江大学电气工程学院,浙江杭州310027

出　　处：《机电工程》2013年第7期856-861,共6页Journal of Mechanical & Electrical Engineering

摘　　要：为了有效减小功率器件的开关损耗,在传统SVPWM(CSVPWM)的基础上,通过合理选择和放置零矢量,实现了不同效果的母线钳位PWM(BCPWM)。通过对比分析CSVPWM和3种典型的BCPWM的相电流谐波、相电压波形、开关损耗,以及中性点电压波动对电机轴承的影响,得出了BCPWM策略的优劣;最后,通过实验进一步验证了BCPWM的可行性。仿真及实验结果表明,与CS-VPWM相比,BCPWM控制下功率器件的开关损耗减小,尤其是采用负载功率因数角动态确定零矢量的BCPWM3策略开关损耗最小;但是BCPWM控制下电流的谐波畸变率(THD)升高,BCPWM2和BCPWM3策略下中性点电压变化率很大,加剧了电机轴承的损坏。In order to reduce switching losses of power device, several typical types of bus-clamping pulse width modulation（BCPWM） were realized by reasonably selecting and placing the zero vectors on the basis of classical space vector pulse width modulation（CSVPWM）. Har- monics of currents and the wave form of voltages were studied and compared. Then the switching losses were calculated and different influ- ence on the motor bearing due to the fluctuations of voltage to neural were explained. Finally, the feasibility of BCPWM was testified by ex- perimental study. The simulation results indicate that compared with CSVPWM, BCPWM can effectively reduce the switching losses, espe- cially which of BCPWM3 that adopts the zero vectors dynamically according to the power factor angle of the load. In the meantime, BCPWM increases the total harmonic distortion（THD） of currents. The fluctuations of voltage to neural are larger in BCPWM2 and BCPWM3, which aggravate the damage of motor bearing.

关 键 词：母线钳位PWM 谐波 开关损耗 中性点电压 谐波畸变率 

分 类 号：TM46[电气工程—电器] TH39[机械工程—机械制造及自动化]