【作者】 邓超；

【导师】 徐金榜；

【作者基本信息】 华中科技大学 ， 控制理论与控制工程， 2011， 硕士

【摘要】 励磁控制器是同步发电机的一个重要部分,对于发电机的正常运行,对电力系统的安全稳定运行具有非常重要的作用。随着发电机容量增加与电网规模的不断扩大,对于励磁控制器的控制性能与速度,保护功能的完善都提出了更高的要求。控制理论、电力电子技术与芯片技术的发展,促进了励磁控制装置的不断创新,数字化技术成为励磁控制系统发展的趋势。本文在这种背景下,设计以TMS320F28335为核心的励磁控制器。本论文阐述了励磁系统在电力系统中发挥的重要作用,介绍了励磁控制系统的概念、分类及发展状况,并详细说明了励磁控制器的工作原理,分析了各种励磁控制理论的实现方法及实际应用情况:PID励磁控制、PSS(电力系统稳定器)原理、线性最优励磁控制、非线性最优励磁控制并最终根据实际需要确定了本设计的控制方式。?完成了基于该DSP的软硬件设计。硬件上主要介绍了芯片选型及模拟信号采集与处理、同步信号检测、开关量处理、SCI通讯与CAN通讯等模块的设计,给出了各硬件模块设计的结构框图;软件上主要介绍了电气参量测量与处理、移相触发角度计算、脉冲信号产生、励磁给定与限制、通讯与人机交互等模块的设计方法,并给出了各模块的程序流程图。搭建了基于Saber的励磁系统仿真平台,按照需要设置仿真条件。通过空载启动试验分析了PID励磁控制算法各参数的效果及其改进策略;通过给定±10%波动、发电机并网、突加负载、发电机灭磁等试验验证了本设计采用的励磁控制算法正确性。更多还原

【Abstract】 An excitation controller, which ensures generator`s regular operation, is an important part of the synchronous generator and meaningful to the stability of the power systems. With the increase of a single generator and the development of the modern power system, higher requirements have been put forward to the excitation controller, including controlling performance and speed, performances of protection and so on. The excitation controllers are innovated constantly with the development of control theories, power electronics technology and chip manufacture technology. Digital technology is now the development tendency for excitation controllers. Under this background, this thesis designs the excitation controller based on TMS320F28335 DSP.This thesis expounds the importance of excitation system and gives a brief introduction of excitation control system on its basic concepts, classification, and research status, explains the operating principles of the system; studies various kinds of control methods and there applying status: PID excitation, PSS(power system stabilizer), linear optimizing strategy and non-linear strategy; then chooses the control strategy for this system. This thesis complete the hardware and software designs for the excitation system, the hardware design includes chip selecting, analog sampling, synchronization signal sampling, switch signal dealing with, SCI and CAN communication modules and all block diagrams. The software designs includes electric parameters obtaining, phase shift angles calculating, pulse signal creating, excitation references and limits calculating and communication modules and all the program trees.This thesis builds the simulation platform of excitation system based on Saber and sets the corresponding simulation environment. Through non-load starting experiment, the effect of every parameter of PID control strategy can be analysed and its improved strategies are put forward. Through reference±10% change, abrupt change of load, and parallel running, the thesis proves the control strategy of this excitation controller.更多还原