无刷同步电动机智能全数字励磁系统研究分析.doc

摘要 同步电机由于具有功率因数高、运行效率高的优点，在工业领域得到广泛的应用。尤其是近年来水利、冶金、化工等行业的迅速发展，使得同步电机的市场需求很大。励磁系统是同步电机正常工作的核心部件。工业的发展要求同步电机的励磁系统有更好的性能，限制、报警、监控、保护等功能。励磁系统的发展方向是数字化、智能化。其主要体现在励磁调节器和功率单元的数字化上。 基于国内同步电机的励磁发展现状，本文介绍一种无刷同步机智能全数字励磁系统的设计。在无刷励磁同步电动机励磁系统的智能控制中，将模糊控制和神经网络算法引入同步电动机功率因数控制系统，从而构成了模糊神经控制器，实现电机启动阶段的控制。当电机转速达到给定值后，由PID调节器起作用，实现无差控制，输出西门子6RA70整流器电流的给定值，以控制励磁发电机的励磁电流。模糊控制和神经网络相结合，充分利用了二者优势互补的特点，进一步提高了系统的动态性能和鲁棒性传统PID的控制，保证了稳态时系统的无差控制。Abstract Because of its advantages by high power factor and efficiency, synchronous motor to be widely used in industrial areas. Particularly, water conservancy, metallurgy, chemical industry is developing rapidly in recent years , the market demand of synchronous motor is great. The excitation system of Synchronous motor is the core components for its normal work. The development of Industra demand the excitation system a better performance ,and demand it has restrictions, alarm, protection, and other functions. This is reflected in the development of digital, intelligent, and it main reflected in the digital excitation regulator and power units. Based on the situation of excitation of synchronous motor in our country, this paper for a brushless synchronous digital excitation system-wide intelligent design. Algoirthms of fuzzy control and neural network have been introduced to the power factor control system of the synchromotor, so as to form the fuzzy-neural controller to force control during its starting stage in the intelligent control of the brushless excitation system of the synchromotor. When the speed reaches its rated value of the motor, the PID controller will activate to force zero error control to bring the given current value to SIEMENS 6RA70 rectifier,which will control the excitation curent of the generator. The combination of fuzzy control and neural network takes full advantage of the specialty which offsets each other to improve the dynamic and robust performance of the system further.The traditional PID control assures no error contro