基于Simulink平台的变压器纵联差动保护的仿真研究

Simulation Experiment Research of Transformer Longitudinal Differential Protection Based on Simulink Platform

电力系统实验综合性强、复杂且抽象难懂,实验仿真相较传统实验在电力系统实验教学中具有一定优势。采用Simulink仿真平台设计电力变压器纵联差动保护实验仿真。从已知案例出发做了相关计算,设计变压器、电流互感器等关键元件的参数,构建主电路仿真模型,分析变压器正常或区外故障时电流互感器在计算变比和选择变比情况对差动回路电流的影响、变压器内部短路故障时的差动保护等。通过参数计算、建模及实验仿真分析等过程,使得抽象问题具体化,展现了实验仿真灵活性、优越性、创新性等特点。

Power system experiments are comprehensive,complex and difficult to understand.Compared with traditional experiments,simulation experiments have lots advantages in power system experiments.The authors of this paper take the complex experiment of power transformer longitudinal differential protection as a case,and design the specific simulation experiment process with the help of Simulink simulation platform.Firstly,based on known cases,this paper makes relevant calculation and demonstration and designs parameters of the transformer,current transformer and other key components.Then,this paper constructs the main circuit simulation model.Finally,this paper designs and analyzes the simulation experiments of the current transformer by calculating the transformation ratio and selecting the transformation ratio on the differential circuit current when the transformer is normal and external faults and the differential protection of the internal short-circuit fault of the transformer.Through the process of calculating parameters,modeling,simulation and experimental analysis,it makes abstract problems concrete,and shows that the simulation experiment has outstanding features such as flexibility,superiority and innovation.