基于交流变频感应的新型无刷励磁系统的理论和技术研究

New type brushless excitation based on AC variable frequency induction is studied intensively in this project. This type can improve the dynamic performance,material utilization and strong excitation of brushless excitation system which can solve the existing problems currently. The detection of excitation current and rotor position and the starting of synchronous motor can be achieved by this new type brushless excitation system.The researches of this project include:(1)mathematical model,operating characteristics and optimization design, performance analysis and design method of AC induction exciter,(2)control method of the brushless excitation system in order to improve dynamic performance and strong excitation capability,(3)control method of the excitation torque and solving the starting problem of AC synchronous motor by the excitation torque.(4)detection methods of sensorless brushless excitation system rotor variable which can achieve the detection of synchronous motor excitation current and rotor position.Thus, this new type excitation system has many obvious advantages in comparison with the conventional brushless excitation system which is highly integrated system including motor technology,power electronics,control and detection technology.This research can lay a foundation for the theoretical and technical basis of of AC variable frequency induction brushless excitation system.

本项目拟对提出的基于交流变频感应的新型无刷励磁系统进行深入研究，提高无刷励磁系统的动态性能、强励能力以及励磁机的材料利用率，解决同步电动机的无刷励磁目前存在的问题，利用无刷励磁系统实现同步电机的励磁电流和转子位置检测以及工频同步电动机的起动。本项目的研究内容包括：第一，研究交流感应励磁机的数学模型、运行特性和优化设计，解决励磁机性能分析和设计的方法；第二，研究无刷励磁系统的控制方法，提高励磁系统的动态性能和强励能力；第三，研究励磁机电磁转矩的控制方法，解决利用励磁机的电磁转矩实现工频同步电动机的起动问题；第四，研究无刷励磁系统的无传感器转子变量检测方法，解决同步电机的转子励磁电流和位置检测问题。因此，该励磁系统与现有的无刷励磁系统相比具有许多明显的优势，是包括电机技术、电力电子技术、控制和检测技术的高度集成的系统，其研究为新型交流变频感应无刷励磁系统的实际应用奠定理论和技术基础。