低开关频率下的不对称空间矢量脉宽调制  

Asymmetric SVPWM at Low Switching Frequency

作　　者：袁庆庆[1] 伍小杰[1] 吴强[1] 朱洪顺[1] 

机构地区：[1]中国矿业大学,信息与电气工程学院,江苏徐州221008

出　　处：《电力电子技术》2013年第5期4-6,17,共4页Power Electronics

基　　金：国家自然科学基金项目(51077124);江苏省2012年度普通高校研究生科研创新计划项目(CXZZ12_0930)~~

摘　　要：降低功率器件开关频率是减少大功率变换装置损耗的主要途径,但这样会造成脉宽调制(PWM)环节输出谐波增加、电流畸变率增大,影响系统控制性能。针对目前各类优化的PWM策略在低开关频率时存在的诸多问题,提出了将不对称规则采样与空间矢量PWM(SVPWM)相结合的不对称SVPWM(ASVPWM)算法,在开关频率低至500 Hz时,输出电流总谐波畸变率(THD)较采用SVPWM算法时有所降低,且算法简单、动稳态性能优越。Matlab仿真及DSP实验验证了该调制策略的有效性与可行性。Switching frequeney reduction of the power semiconductors has been being an important approaeh to realize the energy-saving and exhaust-reducing for the high power converters, which may cause an undesired harmonic distortion of the converter output, and affect the control system performance.There are some problems of the existing optimal pulse width modulation （PWM） strategy when the switehing frequency is low, such as steady off-line solution, complicated algorithm and so on.According to these, this paper proposes a new modulation strategy combined with asym- metric regular sampling and the space vector PWM （SVPWM）.With the new asymmetric SVPWM （ASVPWM）, the AC current total harmonic distortion（THD） could be reduced when the switching frequency is 500 Hz along with a simple algorithm and a nice dynamic performance.Finally, Maflab simulation and DSP experimental results verify the effectiveness of the proposed modulation strategy.

关 键 词：空间矢量脉宽调制 低开关频率 不对称规则采样 

分 类 号：TN787[电子电信—电路与系统]