含死区的单相并联有源滤波器建模及控制策略研究  

Modeling and Control Strategy Design for Single-phase Shunt Active Power Filter Containing Dead-time

作　　者：戎袁杰[1] 郑雪生[1] 徐长波[1] 李春文[1] 

机构地区：[1]清华大学自动化系,北京100084

出　　处：《系统仿真学报》2009年第15期4739-4742,4747,共5页Journal of System Simulation

基　　金：国家自然科学基金(60674039)

摘　　要：为减少由于死区时间所产生的附加谐波含量,建立了包含死区的单相并联有源滤波器(APF)混杂动态模型。根据脉宽调制原理(PWM)与精确离散化方法,将混杂动态模型转换为等效离散时间系统(EDTS)模型,并将EDTS模型在平衡流形邻域近似线性化,得到以脉宽偏差为输入函数的线性等效离散系统(LEDTS)模型。依据LEDTS模型,以PWM信号的脉宽作为控制量,设计了满足一定性能指标的切换线性二次最优控制器。仿真实验验证了所提建模和控制策略的有效性与可行性。In order to reduce the harmonics generated by the dead-time, a hybrid dynamic model containing the dead time was built for single-phase active power filter. The model was further transformed to an equivalent discrete-time system （EDTS） model in light of the PWM theory and the accurate discretization method. At some neighborhood of the equilibrium manifold, the EDTS was transformed to a linear EDTS （LEDTS） model. In terms of the LEDTS model, a switched linear quadratic regulator was utilized to meet the deffinitive performance. The control scheme adopts the duty ratio of the PWM signal as the control variable which is easy in realization and can compensate the influence brought by the dead time. Simulation results illustrate the effectiveness of the proposed control strategy.

关 键 词：并联有源滤波器 线性二次最优控制器 死区时间 混杂动态 

分 类 号：TM76[电气工程—电力系统及自动化]