虚拟PID控制器的设计.pdfVIP

虚拟 PID 控制器的设计 摘 要 目前对系统过程控制技术的研究国内外已发展到了一个相当成熟的水平。即使是 有很大滞后，负荷经常变化的系统，也总能找到相应的控制方法来达到较为理想的控 制效果。然而目前在国内仍有为数不少的行业因其自身的特点决定了其行业规模小， 产品价值较低，而被控对象又具有一定的难度（如滞后时间较长、负荷经常变化等）。 这些企业主不可能投入与其产品本身价值不相符合的费用，采用复杂调节系统或采用 高性能智能仪表来达到系统控制要求。 本论文所要解决的问题是通过一种使用方便的工具（如软件）能够提供合适的控 制方案，并使用价格不高的仪表与其低值产品（或设备）相配套，以满足其控制要求。 本论文所要达到的目的是用Lab View 8.2设计以个简单的PID控制器，它具有分析功 能，对被控对象进行辨识，得出对象的特性曲线，从而建立相应的模型，并由此提出 相应的控制方案。将较为复杂的控制过程转化成一组简单的调节方案。 经仿真结果显示，由用Lab View语言实现的虚拟PID控制器所完成的PID基本调节 规律对系统性能的影响与用自动控制理论分析所得到的结论也基本一致。 关键词：虚拟仪器，Lab VIEW 8.2 ，PID控制器 I 虚拟 PID 控制器的设计 Abstract The technology of system process control has matured in the world recently. In order to reach ideal effect the control method can be found even to system which has long delay or which load is Time variable. But in our country there are some industries which output value is very low. The high expense using complicated control system or high performance intelligent instrument does not match with such low output value. It is also impossible using complex instruments (such as DCS) to reach control purpose because the lack of automaTic control engineer in these industries. In order to solve above problem, in this thesis an adequate control plan by applicaTion of a convenient tool (such as software) is provided. The goal of this thesis is: design a simple PID controller which has analysis funcTion. By using this we can recognize controlled object to obtain a characterisTic curve of object. Based on this characterisTic curve we can establish a model and provide an adequate control plan. Now this problem has changed from the complicated control process to a set of simple control plan. The result