基于状态观测器的PWM整流器电流环无差拍控制技术

被引:27
作者
李春龙 [1 ]
沈颂华 [1 ]
卢家林 [2 ]
张建荣 [2 ]
白小青 [2 ]
石涛 [2 ]
机构
[1] 北京航空航天大学自动化科学与电气工程学院
[2] 西安爱科电子有限公司
关键词
数字控制; 状态观测器; 无差拍; 交流电子负载; PWM整流器;
D O I
10.19595/j.cnki.1000-6753.tces.2006.12.013
中图分类号
TM461 [整流器];
学科分类号
080801 ;
摘要
由零阶保持器及计算时间产生的控制延时是数字控制的固有缺点,将会导致系统振荡以至不稳定。传统电流状态观测器由于其本质是开环观测器,预测效果不甚理想。为补偿延时,一种基于新型状态观测器的方法被提出。该方法首先分析了一个开关周期内的电流变化情况,然后通过在一个开关周期的中间时刻采样获得新输出变量来校正观测误差,据此得到观测器从而预测下一开关周期电流值。此方法消除延时影响不仅使系统稳定,且对给定电流输入可取得无差拍响应。1kW的能量回馈型交流电子负载样机被用于验证该方法,样机采用25kHz的开关频率和TMS320F2812DSP控制芯片,仿真和样机实验都验证了理论分析的正确性。
引用
收藏
页码:84 / 89
页数:6
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