菜单
　　
    摘要过去，对于风机以及电机调速系统，一直是通过改变阀门开度大小来改变给风量以及给水量，这样不仅导致输入功率很大，也导致输出消耗的能量增加。
    随着电力电子器件的产生，异步电机的调速问题得到了很好的解决，调速性能甚至优于直流电机，电力电子器件的产生给异步电机的调速问题带来了福音。异步电机的调速有多种方法，恒压频比控制是交流电动机变频调速最基本的一种控制转速方式。39966
    本文是基于恒压频比的水泵节能控制系统的设计及讨论,其中提出一种基于恒压频比的交流闭环变频调速系统的设计方法:即恒压频比调速系统，它是将变频器、感应电机以及PID等看成一个整体。
    本文通过分析系统的基本原理,并且剖析了系统结构，建立了仿真系统，并且通过MATLAB进行了仿真。最后仿真结果表明:基于恒压频比的水泵节能控制系统比传统的水泵更节能。
     为了确定系统运行的可行性，在进行系统仿真之后，又做了恒压频比的电机调速系统试验。经过对实验结果的计算及分析表明：本系统实现了恒压频比调速，可自动控制，且系统运行起来很稳定。
    毕业论文关键词：节能控制 恒压频比 系统仿真
    Abstract In the past, it has been changed by varying the size of valve opening to change wind or water for wind turbine and motor speed control system, which not only leads to the input power is too much, but also will increase the consumption of the output energy.
    With the generate of power electronic devices,Asynchronous motor speed control issues have been solved well,Velocity modulation performance even better than the DC motor,Can be said that the generation of the power electronic devices brought the gospel to the asynchronous motor of its speed control. There are several methods to control the asynchronous of its speed, constant U/f is the basic control way of the AC motor.
    This paper is based on the design and discussion of constant U/f of the water pump energy-conservation control system, which puts forward a kind of based on constant U/f design method of ac frequency control of motor speed closed loop system: the speed governor system of constant U/f, it inducts motor and frequency converter and PID, etc as a whole.
    Through the analysis of the basic principle of the system and the structure of system, the simulation system is established, and simulated by MATLAB as well. Finally, the simulation consequence show that the constant U/f of the water pump energy-conservation control system is better than the traditional pump in saving energy.
    In order to determine the feasibility of execution of the system, after doing the system simulation, the constant U/f of the motor speed control system has been experimented. Through calculation and analysis of the experimental results show that this system has realized the constant U/f control,it also can automatically control, what’s more, the system running is stable.
    Key words：energy-conservation control  constant U/f  the system simulation
    目   录
    摘要     I
    Abstract     II
    1  绪论    1
    1.1 课题背景及意义1
    1.2国内外研究现状2
    1.3 本设计的主要内容2
    2  基于恒压频比的水泵节能控制系统设计原理的分析    4
    2.1 基频以下调速4
    2.2 基频以上调速7
    2.3 系统设计方案选择8
    2.4 恒压频比控制的能耗分析9
    3  基于恒压频比的水泵节能控制系统的结构    12
    3.1变频器的原理12
    3.1.1整流器13
    3.1.3逆变器14
    3.2 PWM控制器的设计15
    3.3 PID控制器的设计16
    3.3.1 PID原理16
    3.3.2 PID参数整定18
    4  基于恒压频比的水泵转速调节系统仿真    20
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