摘要
变频器具有优异的调速功能、高效的起制动效率以及良好的节能效果,无论是在工业生产、科学研究还是实验教学等领域都得到了广泛的应用。但由于其集成化高、内部结构复杂以及价格高、配套数少等原因,在实验室只能辅助学生做电动机调速等基本操作,很难将整流、滤波、逆变、比例积分控制和脉冲宽度调制波控制等理论知识与其结合讲解给学生。该文利用Simulink设计了一种交-直-交变频调速系统的仿真模型,将工频电源转换成为频率可调的交流电压,并结合PI控制、调制波控制技术,实现三相异步电机调速控制。基于此教学仿真模型,学生可以对不同PI、滤波以及调制波控制参数进行仿真分析,既可以让学生将变频器涉及的重要理论知识通过仿真分析得以验证,进一步加深对控制理论的理解,同时也为电机控制实验教学奠定良好的基础,并可显著提高学生设计电路、仿真分析以及解决问题的能力。
Due to excellent speed regulation function,efficient starting and braking efficiency and sound energy saving effect,the frequency converter has been widely applied in industrial production,scientific research and experimental teaching.However,due to its high integration,complicated internal structure,high cost and small quantity,it can only be used to assist students to do basic operations in the laboratory such as motor speed adjustment,and it is difficult to teach the theories of rectification,filtering,inverter,proportional-integral(PI)control,and sinusoidal pulse width modulation(SPWM)wave to students.This paper has designed a AC-DC-AC variable frequency speed control system using Simulink,and converted fundamental frequency power supply to frequency-varying alternating voltage,and achieved three-phase asynchronous motor speed control by combining with PI control and control techniques of modulated wave.Based on this teaching simulation model,students can perform simulation analysis on different PI,filtering and modulation wave control parameters,namely,allowing students to verify the important theoretical knowledge related to the frequency converter through simulation analysis.This helps further deepen the students’understanding of the control theory,lay a good foundation for the experimental teaching of motor control,and improve the students’ability to design circuits,simulate analysis and solve problems.
作者
徐航
郭颖奇
XU Hang;GUO Yingqi(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《实验科学与技术》
2021年第3期77-81,116,共6页
Experiment Science and Technology
基金
四川大学教改项目(SCU201094)。
