同步发电机励磁系统模型辨识

发布时间：2018-01-13 02:23

本文关键词：同步发电机励磁系统模型辨识　出处：《郑州大学》2014年硕士论文　论文类型：学位论文

【摘要】：同步发电机的励磁系统与发电机及电力系统的电压稳定控制密切相关。励磁系统在提高同步发电机和电力系统的运行稳定，改善系统的动态品质方面起着非常重要的作用；因此知道同步发电机励磁系统的详细数学模型对于电网稳定分析计算是非常有必要的。目前虽然大部分的仿真软件中都有励磁系统的模型库，但是由这些模型库中的模型参数大都根据出厂时各个元件的初始元件参数组合或者经验得到，而且很多情况下没有考虑各个元件之间的相互影响，这样就对运算及仿真的结果造成一定的影响，根据以上情况，本文专门针对同步发电机的励磁系统设计了一套模型辨识装置进行参数辨识，以确定励磁系统模型的真实参数。整套辨识装置包括数据采集和上位机参数辨识两部分。励磁系统参数辨识的第一步就是需要通过数据采集装置对实际系统有关信号进行多通道的同步采集，考虑到同步发电机励磁系统的特点和复杂性，本文所用的数据采集装置以C8051F410单片机和AD7606为核心芯片，能够实现多通道的同步采样，并能将采集到的数据存储到大容量的U盘中，从而实现脱机采集。同步发电机励磁系统模型辨识的核心环节就是通过上位机辨识软件进行参数辨识，，上位机辨识软件是通过MATLAB和VB的相互调用实现的。其中辨识软件的核心辨识算法是通过MATLAB编写的遗传算法，辨识软件中的采样命令设置和通道分拣转换是通过VB编写的，辨识软件中的数据预处理和参数辨识及校验是通过VB调用MATLAB中的函数及程序实现的，整个上位机辨识软件界面方便直观，通用性强。该模型用由运算放大器及阻容元件构成的典型环节组合而成。以其为对象的辨识结果，表明辨识装置具备了同步发电机励磁系统模型辨识的基本功能。
[Abstract]:The excitation system of the synchronous generator is closely related to the voltage stability control of the generator and the power system . The excitation system plays a very important role in improving the operation stability of the synchronous generator and the power system and improving the dynamic quality of the system . The first step of parameter identification of excitation system is that the data acquisition device is used to synchronously collect the relevant signals of the real system . Considering the characteristics and complexity of the excitation system of synchronous generator , the data acquisition device used in this paper is the core chip of MCU and AD7606 , which can realize multi - channel synchronous sampling , and can store the collected data into the large - capacity USB flash disk , so as to realize the offline acquisition . The key link of the identification of the excitation system model of synchronous generator is the parameter identification through the upper computer identification software . The identification software of the upper computer is realized by the mutual call of MATLAB and VB . The kernel identification algorithm of the identification software is written by VB . The identification and verification of the data in the identification software is realized through VB calling function and program in MATLAB . The whole upper computer identification software interface is convenient and intuitive , and has strong versatility . The model is composed of a typical link composed of an operational amplifier and a resistance capacity element . The identification result of the object is obtained , which indicates that the identification device has the basic function of the identification of the excitation system model of the synchronous generator .

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM31

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