【作者】 董世君；

【导师】 陈众；

【作者基本信息】 长沙理工大学 ， 电力系统及其自动化， 2012， 硕士

【摘要】 随着现代电力技术在电力系统中的应用，越来越多的过程需要通过辨识来为电力系统的运行、控制和预报等决策提供依据。因此，不管从理论意义，还是实际应用价值方面来讲，研究电力系统辨识就变得非常必要。本文对电力系统核心部件同步发电机的d轴暂态开路时间常数的辨识进行了研究，并探讨了相应辨识模型在同步发电机停机过程电气制动中的应用。首先简单介绍了d轴暂态开路时间常数辨识方法的研究现状，针对如何准确高效地辨识出该参数的问题，本文通过分析同步发电机空载状况下的电磁和电压方程，推导出了同步发电机在起励试验时的以机端电压、励磁电压、励磁电流、d轴暂态开路时间常数T’_d0和起励时间t等为主要参数和变量的数学模型，运用MATLABSIMULINK仿真平台搭建同步发电机起励试验仿真模型测得实际量测数据，通过采用最小二乘法进行d轴暂态开路时间常数T_d0的参数辨识，仿真结果证明了该数学模型的科学性和最小二乘辨识算法的适用性。此外，针对如何确定同步机定子绕组三相短路电气制动中的制动电流大小的问题，本文基于前文辨识出的同步发电机空载时的数学模型，通过MATLAB与VB混合编程开发了一款电气制动特性分析软件，探讨了由该模型确定的制动电流在电气制动中的应用效果，证明了由该模型确定制动电流的有效性。更多还原

【Abstract】 With the application of modern power technology used in the power system,more and more process of the power system needs to be identified to provide areference for operation, control and forecasting and so on. Therefore, it is verynecessary to research the power system identification in both theoretical significanceand practical value.This paper researched the identification of the d-axis transient open circuit timeconstant of synchronous generator, which is the core components of the powersystem , With the identified model used in the electrical braking of shut downprocess of the synchronous generator sets. This paper briefly introduced theapplication and development of the identification of the d-axis transient open-circuittime constant. In order to identify the parameters accurately and efficiently, Theelectromagnetic and voltage equation of synchronous generator in no-load conditionswas analyzed and the mathematical model of the synchronous generator, whichcontained the main parameters and variables such as the terminal voltage, theexcitation voltage, the excitation current，the d-axis transient open circuit timeconstant and the excitation time t in the excitation test, was derived. It got the actualmeasured data by the MATLAB SIMULINK simulation platform to build synchronousmotor excitation test simulation model and the parameter identification of d-axistransient open circuit time constantT’_d0was done by the least square method,simulation results show that the mathematical model derived scientific and the leastsquare identification method affection.In addition, according to the problem of how to determine the size of the brakingcurrent of the synchronous machine stator of the winding three-phase short-circuitelectrical braking，The electrical braking time-tested platform was developed by thehybrid programming between MATLAB and VB to investigate the application of thebraking current of the excitation in the electric braking，which was obtained by theidenfied mathematical model of synchronous generator above.更多还原