摘要

异步电动机采用变频调速技术，具有调速范围广，调速时因转差功率不变而无附加能量损失的优点，因此，变频调速是一种性能优良的高效调速方式。

本文以MATLAB为仿真工具，介绍了Simulink中的仿真模块，研究了交流电机变频调速系统，分析了变频器的构成和工作原理，并据此对逆变电路进行了仿真设计。首先对调速系统仿真所需要的各种电力系统模块做了简要的介绍，说明了逆变器的工作原理，在此基础上用MATLAB/Simulink软件分别对各种电路模块进行了仿真设计，进而设计出了实际中广泛应用的交-直-交变频器的仿真模型，实现了对交流电机变频调速系统的仿真研究，在此基础上建立电机模型，进行矢量控制设计，以带转矩内环的转速、磁链闭环矢量控制的方法对异步电动机变频调速系统进行建模和仿真，并对仿真结果进行了分析,由仿真结果可以看出系统转速的动态响应快，稳态跟踪精度高，表明此建模方法是可行和有效的。

关键词：MATLAB/Simulink 变频调速 逆变器 仿真

ABSTRACT

With the application of frequency and speed conversion technology to synchronous motor, its speed can be wide-ranged adjusted.  When it comes to adjusting speed, because of slip power unchanged, there is no additional energy lost. Thus it makes this technology a high-equality and efficient way to exchange the speed.

This thesis, aiming at MATLAB as simulation tool, introduces Simulink simulation module and the AC motor speed control system as the subject of the research and analyzes the structure of the inverter and how it works. On this basis,a variety of inverter circuit simulation designs are conducted. First of all, this thesis makes a brief introduction about power system module power which needs power electronic simulation, the working principle of the inverter included. Based on the theory above, then MATLAB / Simulink software are used in the simulation designs about different kinds of circuit modules. Moreover the designs of the simulation model of widely-used cross - DC - AC inverter are conducted to achieve the goal of the simulation study of AC motor speed control system, carries the modelling and the simulation on asynchronous motor adjusting-speed system based on vector control with torque inner rim and flux linkage of closed loop，gives out the simulation and makes analyse to it．The simulation result of the model shows the speed of dynamic response and the accuracy of steady-state tracking，also confirmes that the modelling is feasible and effective．

Key words：MATLAB/Simulink   Frequency Control   Inverter   Simulation