CAJ | 학술논문

扩展卡尔曼滤波器作为非线性的速度、位置估计器应用在永磁同步电动机无传感器控制系统中已经是一个很成熟的课题.但是,这种控制系统中有一个始终没有解决的问题:虽然在高速区(>5Hz)卡尔曼滤波具有较高的估计精度,但是在低速区(<5Hz),其控制性能较差.针对永磁同步电动机扩展卡尔曼滤波无传感器控制时低速性能不佳的问题,分析了低速性能不佳的原因--电压信噪比较小,并且提出了提高信噪比的方法--调节逆变器的直流母线电压,来改善系统的低速性能.通过调节逆变器的直流母线电压,成功实现了在2Hz左右的低速运行,仿真和实验结果证明了该方法的有效性.
확전잡이만려파기작위비선성적속도、위치고계기응용재영자동보전동궤무전감기공제계통중이경시일개흔성숙적과제.단시,저충공제계통중유일개시종몰유해결적문제:수연재고속구(>5Hz)잡이만려파구유교고적고계정도,단시재저속구(<5Hz),기공제성능교차.침대영자동보전동궤확전잡이만려파무전감기공제시저속성능불가적문제,분석료저속성능불가적원인--전압신조비교소,병차제출료제고신조비적방법--조절역변기적직류모선전압,래개선계통적저속성능.통과조절역변기적직류모선전압,성공실현료재2Hz좌우적저속운행,방진화실험결과증명료해방법적유효성.
The application of an extended Kalman filter(EKF) as nonlinear speed and position observer in PMSM drives has been a mature research project. However, one significant problem still unsolved is the weakly performance at low speed of PMSM drive system that yield to the best estimation performance on high speed range(>5Hz). The reason about weakly performance at low speed-lower ratio of voltage signal-to-noise(SNR) was analyzed, and proposed a novel method-adjustable DC bus voltage, to enhance the SNR as well as to improve the low speed performance. The findings from the experiment that the better performance in low speed(<5Hz) by adjusting the DC bus voltage according to the system reference speed were also presented.Simulation and experimental results were given to confirm the effectiveness of the proposed method.