脉宽调制整流器直接平均功率控制  

Direct Mean Power Control of PWM Rectifier

作　　者：张永昌[1] 谢伟[1] 

机构地区：[1]北京市电力电子与电气传动工程研究中心,北方工业大学,北京市100144

出　　处：《电力系统自动化》2014年第5期90-95,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51207003,51347004);北京市科技新星计划资助项目(xx2013001);重庆市自然科学基金资助项目(cstc2012jjB107)~~

摘　　要：直接功率控制作为脉宽调制(PWM)整流器的一种经典高性能控制方法,具有动态响应快速、无需电流内环整定和参数鲁棒性好等优点,其不足之处是:稳态时功率脉动较大,网侧电流含有较多谐波分量,需要高速AD采样。在PWM整流器的预测功率模型基础上,提出了直接平均功率控制,其特点是在一个控制周期内,将一部分时间分配给从矢量表中得到的非零矢量,其余时间则由零矢量作用。通过控制一个控制周期内有功功率的平均值与参考值相等,从而解析得到非零矢量的作用时间。实验结果表明,该方法能够在保持传统矢量表直接功率控制的良好动态性能和单位功率因数运行的同时,有效抑制稳态时有功功率的脉动,减少网侧电流谐波和总谐波失真。Direct power control （DPC） is a classical high performance control strategy for the pulse width modulation （PWM） rectifier,which features the merits of quick response,no need of inner current regulation and strong robustness against parameter mismatches,etc.However,DPC exhibits high power ripples and rich grid current harmonics at steady state and requires high sampling frequency.Based on the predictive model for the PWM rectifier,direct mean power control（DMPC）is proposed by employing the non-zero vector from a predefined switching table and a zero vector during a control period.By equalizing the mean value of active power to its reference value,the duration or duty cycle of the non-zero vector can be analytically derived.Experimental results show that,compared with conventional DPC,the proposed DMPC can achieve reduced power ripples at steady state,less current harmonics and lower current total harmonic distortion （THD）,while maintaining unit power factor operation and quick response of conventional DPC.

关 键 词：脉宽调制整流器 平均功率 直接控制 预测控制 

分 类 号：TM461[电气工程—电器]