具有电枢反应非线性不确定性的直流电机速度鲁棒跟踪控制研究

该文针对电枢反应引起的非线性不确定性及具有参数变化和负载扰动的直流电机速度跟踪控制问题，构造了一个适当的增广被控对象，将其转化为一标准设计问题，设计了速度控制系统的鲁棒状态反馈控制器，进而利用二自由度鲁棒跟踪设计方法设计了速度鲁棒跟踪控制器。仿真研究结果表明，该文所设计的速度鲁棒跟踪控制系统，不仅对于电机的非线性不确定性有较好的控制效果，而且可以有效地抑制电机负载扰动的影响。     

AC motor drive systems with a reduced-switch-count converter

This paper presents two reduced-switch-count AC drive systems. One of the configurations was conceived to operate with a two-phase motor and the other one with a three-phase motor. The drive systems provide both bidirectional power flow and power factor control. Pulsewidth modulation techniques for the converter control are discussed. Experimental results are presented.     

Determining driver visual attention with one camera

This paper presents a system for analyzing human driver visual attention. The system relies on estimation of global motion and color statistics to robustly track a person's head and facial features. The system is fully automatic, it can initialize automatically, and reinitialize when necessary. The system classifies rotation in all viewing directions, detects eye/mouth occlusion, detects eye blinking and eye closure, and recovers the three dimensional gaze of the eyes. In addition, the system is able to track both through occlusion due to eye blinking, and eye closure, large mouth movement, and also through occlusion due to rotation. Even when the face is fully occluded due to rotation, the system does not break down. Further the system is able to track through yawning, which is a large local mouth motion. Finally, results are presented, and future work on how this system can be used for more advanced driver visual attention monitoring is discussed.     

A three-phase line-interactive UPS system implementation with series-parallel active power-line conditioning capabilities

This paper presents a three-phase line-interactive uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, using a synchronous-reference-frame (SRF)-based controller, which allows an effective power-factor correction, load harmonic current suppression, and output voltage regulation. The three-phase UPS system is composed of two active power filter topologies. The first one is a series active power filter, which works as a sinusoidal current source in phase with the input voltage. The other is a parallel active power filter, which works as a sinusoidal voltage source in phase with the input voltage, providing to the load a regulated and sinusoidal voltage with low total harmonic distortion. Operation of a three-phase phase-locked loop structure, used in the proposed line-interactive UPS implementation, is presented and experimentally verified under distorted utility conditions. The control algorithm using the SRF method and the active power flow through the UPS system are described and analytically studied. Design procedures, digital simulations, and experimental results for a prototype are presented to verify the good performance of the proposed three-phase line-interactive UPS system.     

特定消谐式变频器的研究

在分析特定消谐技术基本原理的基础上,设计了一种特定消谐式变频器,对其变压变频电路、保护电路等进行了深入研究。实验结果表明,该变频器具有消除谐波次数多、残余的谐波分量幅值小、使电动机发热损耗小等优点。