【作者】 芈书亮；

【导师】 卢子广；

【作者基本信息】 广西大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 近年来,随着汽车用电设备的日益增多,汽车用电量迅速增长。然而,目前还被广泛使用的传统14V汽车发电系统因固有设计局限无法满足未来汽车对高效、高输出功率发电系统的需求,为此本文提出一种新型42V汽车爪极同步发电机系统,将发电机与PWM整流器串联,并采用磁场定向控制方法,保证直流侧输出电压稳定在42V。文中给出包括爪极发电机、PWM整流器和蓄电池在内的一系列设备模型,其中爪极发电机是在αβ坐标系下按照发电机惯例建立,并采用交流电势控制和直流稳压控制两种电压控制策略。采用励磁单闭环来调节交流电势,当转速变化时,通过调节励磁电流保证定子电势保持恒定。与此同时,采用相电流╱直流电压双闭环直流调压系统,其中相电流环作为内环,直流电压环作为外环,当负载变化时能够保证输出的直流电压迅速稳定在42V。文中系统并未采用传统速度传感器和交流电压传感器,而是通过直流侧输出电压和PWM整流器开关信号计算交流电压和发电机机械转速,系统动态性能可以与采用速度和交流电压传感器时的动态性能相匹敌,从而在一定程度上降低了系统成本,所提出的控制方法也已在实时仿真实验中获得了验证。更多还原

【Abstract】 In recent years,the electrical demand in automobiles has been increasing steadily with the introduction of more and more electrical devices.However, traditional 14-V automobile power generation system,which is still widely used nowadays,is not able to meet the foreseeable future power requirements due to its inherent design limitations.A new high-power,high-efficiency 42-V claw-pole synchronous generator system,therefore,is proposed in this thesis.A PWM rectifier is directly connected to the generator,and field-oriented control principle is also introduced to ensure the DC output voltage stabilized at 42-V.The models of the claw-pole generator,the PWM rectifier and the battery are presented.The claw-pole generator is modeled based onαβcoordinates in the generating direction and two different voltage control strategies are also proposed in order to control the AC electromotive force of the generator and the DC output voltage of the rectifier.The field current loop is regulated with varying speed. Meanwhile,a double closed-loop system including phase current and DC voltage is also introduced.Among them,the phase current loop is used as inner loop,and the DC voltage loop is used as outer loop to ensure the DC output voltage stabilize at 42-V with loads changing.To reduce the cost of the system,the control system without speed and AC voltage sensors is presented.The speed of the generator and the terminal AC voltage of the generator are calculated based on the DC output voltage of the rectifier and the switching signals of the PWM rectifier.The dynamic response of the system is as the same as the system with speed and AC voltage sensors used.The proposed approaches have already been evaluated by the real-time simulation experimental results.更多还原