脉宽调制在电源及电机控制中的应用.docVIP

本科毕业设计（论文） 题目：脉宽调制在电源与电机控制中的应用 院 系：工学院电气与电子工程系 专 业：自动化 班 级：自动化1202 姓 名： 学 号： 指导教师： 二〇一六年六月 脉宽调制在电源与电机控制中的应用 摘 要 脉宽调制技术作为目前逆变电路控制中不可或缺的驱动电路的一部分。本文首先PWM调制技术的优缺点。其次详细分析脉宽调制技术的基本原理、调制方式以及SPWM调制方法。本文选取了直流开关电源、单相逆变器、以及三相逆变电源与异步电机的控制等部分进行了详细的，并均通过了仿真验证该调制技术的运用。开关电源选取的是Boost升压电路为主电路，通过单闭环控制方法有效实现了输出电压的闭环控制；单相逆变器通过LC滤波电路、输出电压的单闭环控制实现输出电压稳定于给定电压。三相逆变电源的存在着电流的解耦，所以控制策略需要先对电流进行解耦到ID、IQ信号，通过电流、电压进行双闭环控制从而实现输出电压电流的稳定性。最后在电机控制中选用了目前工业控制中运用矢量控制策略，通过改变调制信号的频率达到改变调制信号电压的目的。 关键字PWM调制 DC-DC 逆变器 异步电机 Application f PWM in Power Supply and Motor Control ABSTRACT Pulse width modulation technology as the indispensable part of the drive circuit of inverter circuit control, This article first discuss the use of PWM modulation advantages and disadvantages. Secondly, detailed analysis of the basic principle of pulse width modulation technology, modulation mode and SPWM modulation method. This article selects the dc switching power supply, single phase inverter, and three-phase inverter power supply and control of asynchronous motor, part carried on the detailed analysis, and all through the simulation verify the use of the modulation technique. Selected switch power supply is the boost booster circuit as the main circuit, the output voltage by single closed-loop control method is effective and the closed loop control; Single phase inverter by LC filter circuit, the output voltage of single closed-loop control to achieve stable output voltage to a given voltage. Three-phase inverter power supply decoupling of the existence of the current, so current control strategies need to be decoupled to ID, IQ signal, through the current, voltage double closed-loop control to achieve the stability of the output voltage and current. The final selection of the current in the motor control used in industrial control is vector strategy, by changing the frequency modulation signal to achieve the purpose of changing voltage