基于PLC控制的自动灌溉系统的设计.doc

西安交通大学硕士学位论文 PAGE \* MERGEFORMAT 17 摘 要 水资源的合理利用具有十分重要的意义。相比发达国家，目前我国灌溉方式还存在一定差距。因此农业灌溉自动化成为一个重要的研究方向。PLC具有优良的技术性能，利用PLC控制的灌溉系统更加智能化、运行的可靠性更高。 该设计介绍了可编程控制器（PLC）在自动节水灌溉控制系统中的应用，能根据不同类型的土地进行分类灌溉。系统按照A、B、C三种不同类型的作物的需水量分别采用不同灌溉模式，系统包括执行机构和控制机构两部分，执行机构主要是电动机作为驱动源，通过控制各电机的启动和停止来控制水泵工作，从而给作物进行灌溉。控制机构主要是可编程控制器。为了减少水泵电机的启动电流，减轻对电网形成的冲击，减少能耗，系统采用Y-△启动。 关 键 词：PLC；自动灌溉；Y-△启动 ABSTRACT PAGE 18 ABSTRACT Rational use of water resources is of great significance. Compared to developed countries, Chinas irrigation methods are still some gaps. Therefore, irrigation automation has become an important research direction. PLC has excellent technical performance, the use of irrigation systems more intelligent PLC control, higher reliability. This design describes the programmable controller (PLC) in the automatic control system of water-saving irrigation, irrigation can be classified according to the different types of land. System according to water demand A, B, C are three different types of crops were irrigated using different modes, the system consists of two parts actuators and control bodies, executive agencies are mainly motor as a driving source, by controlling the start and stop of the motors to control the pump to work, giving the crop irrigation. The main control mechanism is programmable controllers. In order to reduce the pump motor starting current, to reduce the impact on the grid formation, reduce energy consumption, the system uses Y-△ start. KEY WORDS: PLC ; Automatic irrigation; Y-△ start 目 录 STYLEREF 标题 1 \* MERGEFORMAT 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc387259869 1 绪论 PAGEREF _Toc387259869 \h 2 HYPERLINK \l _Toc387259870 1.1 课题背景及目的 PAGEREF _Toc387259870 \h 2 HYPERLINK \l _Toc387259871 1.2 课题研究现状 PAGEREF _Toc387259871 \h 2 HYPERLINK \l _Toc387259872 1.2.1 国外研究现状 PAGEREF _Toc387259872 \h 2 HYPERLINK \l _Toc387259873 1.2.2 国内发展现状 PAGEREF _Toc387259873 \h 2 HYPERLINK \l _Toc387259874 1.3 目的和意义 PAGEREF _Toc387259874 \h 2 HYPERLINK \l