摘要
针对三相PWM整流器传统直接功率控制(DPC)引起的开关频率不固定、网侧电流谐波分量高、系统调节时间长等问题的分析,提出了一种基于模型预测(P-DPC)的三相PWM整流器直接功率控制方法。该方法将模型预测理论与二阶拉格朗日插值法相结合,对下一个采样周期的有功功率和无功功率变化进行预测,完成对下一个周期开始时功率给定值的跟踪控制,并采用空间矢量脉宽调制(SVPWM)产生PWM信号驱动整流器功率开关,实现固定的开关频率。仿真结果表明,该方法具有良好的动态和稳态性能,有效降低了交流侧电流总谐波失真(THD),提高了交流侧功率因数。
With the analysis of the problems caused by the traditional direct power control for three-phase PWM rectifier, including the unfixed switching frequency, net side current harmonic component was high, and system settling time was long,a scheme on the direct power control based on model predictive for three-phase PWM rectifier was proposed. By using model predictive and the second order langrange interpolation method to predict the variations of active and reactive power in the next sampling period, which achieved the tracking control to the given power of next period. And using the PWM signal was generated by space vector pulse width modulation（SVPWM） to drive the power switch of rectifier, which made the fixed switching frequency. The simulation results showed that this scheme has better dynamic performance and stable performance; it could reduce the total harmonic distortion （THD） of AC- link current effectively and could improve the power factor of AC-link.
出处
《电机与控制应用》
北大核心
2016年第7期27-31,共5页
Electric machines & control application
基金
国家自然科学基金项目(U1404512)
关键词
PWM整流器
直接功率控制
模型预测
固定开关频率
PWM rectifier
direct power control（DPC）
model predictive
fixed switching frequency
