双容水箱pid液位控制系统的仿真.doc

双容水箱液位PID控制算法的仿真研究 摘要 由于单回路控制系统已不能克服液位控制中的一些问题，如：大时延、非线性、容量滞后等。因此本设计针对这些问题设计串级控制，对单回路控制系统无法控制的问题进行解决，同时比较单回路控制系统和串级控制系统的不同之处。本次毕业设计的课题是多容水箱的PID液位控制系统的仿真。在设计中，主要针对双容水箱进行了研究和仿真。本文的主要内容包括：对水箱的特性确定与实验曲线分析，通过实验法建立了液位控制系统的水箱数学模型，设计出了串级控制系统，针对所选液位控制系统选择合适的PID算法。用MATLAB/Simulink建立液位串级控制系统，调节器采用PID控制系统。通过仿真比较了单回路液位控制系统和串级控制系统控制的不同之处，以及参数的整定及各个参数的控制性能的比较，对所得到的仿真曲线进行分析，总结了参数变化对系统性能的影响。 关键词：MATLAB；PID控制；串级控制；液位系统仿真 More let water tank PID level control system simulation Abstract Because single loop control system has not overcome some of the liquid level control issues, such as: big time delay, non-linear process, capacity lag and so on. So this design is proposed to solve these problems, the cascade control for single loop control system cant control problems were solved, meanwhile compared single loop control system and cascade control system differences. The graduation design topic is based on the MATLAB PID level control system simulation. In the design, I mainly responsible is double let water tank simulation. The main content of this article include: software MATLAB, the introduction and application of the simulation of use in Simulink problems that should be paid attention to. Grasp the basic ideas of PID control to be familiar with PID algorithm, PID parameters setting method. Water tank with the experimental curves to determine the characteristics, through the test method analysis level control system was established mathematical model, the water tank designed cascade control system for the selected level control; choose the appropriate control system PID algorithm. MATLAB/Simulink establishes level cascade control system, the regulator using fuzzy PID control system. Through the comparative simulation single loop level control system and a cascade control system control differences, and parameter setting and various parameters control performance comparison, application gets PID control algorithm is analyzed for simulation curve, summarizes the parameters on the sys