【作者】 卓清锋；

【导师】 刘和平；

【作者基本信息】 重庆大学 ， 电力电子与电力传动， 2002， 硕士

【摘要】 随着电力系统的发展，输电线路电压等级的提高，电力系统的稳定性问题日益突出。异步化同步发电机以其独特的多相绕线式转子结构，通过励磁控制可以实现无功、有功的独立调节，为提高电力系统稳定性和扩大进相运行范围提供了一条崭新的途径。本论文在详细方案论证的基础上选择了交－直－交电压型主电路和数字信号处理器TMS320LF2407构成高性能的异步化同步发电机交流励磁系统。文中讨论了主电路、整流器控制模块、逆变器控制模块、电机转速和转子位置测量模块以及信息交换模块的组成、接口方法和控制原理，详细说明了系统中实现不同电压等级间信号电平匹配的方法、系统与上位机进行同步参数测量的方法以及实现高精度电机转速和转子位置测量的方法。在软件组织上，采用典型的前后台模式，以主程序作为后台任务，中断服务程序作为前台任务，通过对前后台任务的及时切换以及对前台任务进行优先级排序，达到及时响应系统测量、控制、显示等一系列任务。重点分析了整流器和逆变器的协调控制策略，始终保持SPWM高调制度，达到励磁电压调节的快速响应和高分辨率。通过从运行时间和占用空间等方面比较实现浮点数运算的几种方法，并选择了近似计算法作为系统控制算法浮点数运算的方法，在保证足够计算精度的前提下达到计算的快速性，实现低谐波和频率控制精度高的励磁电压。利用CAN总线构造上下位机信息传递的通道以及由液晶和触摸屏组成了人机接口界面。整个系统通过全面的实验验证，实验结果充分说明所设计的系统产生出低谐波、调节速度快、调节范围宽和频率控制精度高的交流励磁电压，达到了预期的目标。最后论文对系统中存在的一些不足提出建议性的改进方案。更多还原

【Abstract】 With the development of power system and enhancement of transmission line voltage, the problem of power system’s stability is more and more of standing out. The asynchronized synchronous generator (ASG)’s reactive power and active power can be adjusted independently by excitation control because of ASG’s special multi-phase wounded winding rotor structure, which provides a novel approach for improving power system’s stability and extending generator’s operating range. The AC-DC-AC voltage source inverter (VSI) main circuit and TMS320LF2407 are selected to form high performance alternating current (AC) excitation system of ASG in this dissertation after detail schemes argumentation. The constitution, interface and control principle of main circuit, rectifier control module, inverter control module, generator’s rotor speed and rotor position measuring module, information exchange module are discussed. Specially, the methods of implementing signals level match in multi-voltage system, synchronizing with PC in parameters measurement and measuring rotor speed and rotor position with high precision are explained in detail. The system software uses typical foreground/background model. The main program serves as background and interrupts’ ISRs serve as foreground. System program responses all measuring, controlling, communicating and displaying tasks in time through switching between foreground and background and queuing tasks in terms of priority level. The concerted control strategy of rectifier and inverter is analyzed to keep high modulation degree of SPWM, which achieves quick response and high resolution of excitation voltage regulation. The approximate computation method is used in float point computation of system’s control algorithms after comparing several methods in respect of running time and program space involved, which attains quick computation besides high precision and implements excitation voltage with low harmonic and high control precision of frequency. The information is exchanged between TMS320LF2407 and PC by CAN bus. The humancomputer interface is made up of LCD and touch screen. The system reached control goal by experimental verification and the experimental results showed the system could produce AC excitation voltage with low harmonic, quick adjusting speed, wide adjusting range and high control precision of frequency. At the same time, the paper put forward some proposed schemes to improve system performances.更多还原