【作者】 李营；

【导师】 李爱平；

【作者基本信息】 东北大学 ， 电力电子与电力传动， 2009， 硕士

【摘要】 微型燃机同步发电机励磁控制系统的研究是当前影响我国微型燃机供电技术发展的关键问题,也是实现微型燃机供电系统国产化亟待解决的问题。Buck变换器技术是微型燃机同步发电机励磁控制系统的重要研究课题,通过对Buck变换器良好的控制,使整个同步发电机励磁控制系统工作在可靠稳定的环境中。本论文以东北大学和沈阳航天新光集团联合开发的微型燃机同步发电机励磁控制系统为研究背景,采用IGBT作为功率开关元件,以DSP作为控制芯片,设计了基于Buck变换器的75kW级无刷同步发电机励磁控制系统,并进行了现场调试运行,各项调试结果均达到了设计要求。本文主要完成的工作如下：(1)设计了励磁控制系统的总体硬件方案,对Buck变换器的整流、降压和滤波进行了设计,并研究设计了数字信号处理单元的采样模块、频率跟踪模块、通信模块、PWM驱动模块等。(2)根据现场噪声比较严重的情况,对励磁控制系统Buck变换器的电磁兼容性进行了分析,设计了保护电路。(3)在原有的励磁控制系统中增加了辅助闭环控制,用来稳定地控制Buck变换器的输出电压,使整个励磁控制系统运行更快速稳定。在Buck变换器的建模设计中,采用状态空间平均法和模糊建模二种方法,仿真结果证明模糊建模方法为最优控制方法。(4)针对控制系统非线性特点,运用T-S模糊控制方法设计了模糊控制器,并对其结果进行仿真分析,经过与P1D控制方式相比较,验证了本文提出方法的有效性。(5)由于系统要求稳定性比较高,而且现场环境比较复杂,难以采集精确的状态量,本文设计了模糊观测器,将观测器与控制器的设计统一到LMI的框架内,利用Matlab中LMI工具的功能,从而得到观测器和控制器的参数,并对结果进行了仿真,取得了优于常规PID控制方法的良好效果。更多还原

【Abstract】 Micro-turbine generator excitation system is not only the key issue which is the impact of China’s technological development of micro-turbine power, but also one of the issues to be settled urgently which is the localization of micro-turbine power supply system.Buck converter technology is one of the main technical of a micro-turbine generator excitation system, through the Buck converter was well analysised and controlled, the entire system will works reliably and stably.Under this background, this thesis was written on the basis of micro-turbine excitation control system which was developed by Northeastern University and Shenyang Aerospace Xinguang Group. A Buck converter control system for the 75kW brushless synchronous generator excitation was designed in this thesis with the help of IGBT as power switch component and DSP as control chip, site debugging was completed, the results reached the design requirements.The main works of this thesis are shown as follows:(1) The entire scheme of hardware for the excitation control system was designed, including the rectifier, depressurization and filtration of the Buck converter. The sampling module, the frequency tracking module, the communication module, the PWM driver module were designed after well studing.(2) For the Situation of more serious noise environment, the electromagnetic compatibility of Buck convertor of the excitation control system had been analysised and improved, and the protection circuit was designed.(3) The auxiliary closed-loop control was increased based on the original excitation control system to control the output voltage of the Buck converter steadily which made the whole excitation control system running faster and steadier. In the modeling design of the Buck converter, the state space average method and fuzzy modeling method were employed. The simulation result proved that fuzzy modeling method was the optimum control method.(4) For the nonlinear response in the program, the T-S fuzzy control was used in the excitation system to design the fuzzy controller, then the results was simulated and compared to the results which was obtained by PID, it proved that the method in the thesis was valid.(5) Due to the more stability required in the system and the more complexity of the environment, the precise state parameter was difficult to acquire, as a result, the fuzzy observer was designed, further the observer and controller were united in the frame of LMI, then utilized the LMI tool in Matlab to get the parameter of the observer and controller, at last simulating the results to get the better effect than the general PID control method.更多还原