【摘要】：過去大型低速二沖程柴油機試車系統(tǒng)燃油、滑油以及冷卻水等的壓力恒定主要通過泵的增減切換、閥門的開度控制來實現(xiàn),存在操作不方便,可靠性低、能源浪費等問題。近年來隨著電力電子技術及自動化控制技術的高速發(fā)展,設計一種更方便、更可靠、更節(jié)能的恒壓控制系統(tǒng)成為可能。針對上面所描述的問題,本文設計了一種恒壓變頻控制系統(tǒng),主要由泵、變頻器、軟啟動器、PLC、壓力變送器、PID控制器等組成。此系統(tǒng)工作原理是通過壓力變送器對實際壓力的反饋、經(jīng)過PID控制器的運算,通過PLC控制泵的增減切換及通過變頻器控制泵的轉速變化來改變系統(tǒng)的流量,從而實現(xiàn)壓力恒定。本文首先分析了恒壓變頻控制的原理,對恒壓變頻的幾種方案進行了分析和選擇,并基于選擇的方案分析了恒壓變頻的運行過程;接著詳細介紹了恒壓變頻系統(tǒng)的硬件結構;最后對恒壓變頻系統(tǒng)的軟件設計進行了分析和說明。本恒壓變頻控制系統(tǒng)是針對大型低速二沖程柴油機試車系統(tǒng)設計的,經(jīng)過現(xiàn)場調試和運行表明本系統(tǒng)控制效果良好,其恒壓控制思想可以推廣運用到試車系統(tǒng)溫度、液位恒定的控制中去。
[Abstract]:In the past, the constant pressure of fuel, lubricating oil and cooling water of large low-speed two-stroke diesel engine was mainly realized by changing the pump and opening the valve. There were some problems such as inconvenient operation, low reliability, energy waste and so on. In recent years, with the rapid development of power electronics and automation control technology, it is possible to design a more convenient, more reliable, more energy saving constant voltage control system. Aiming at the problems described above, this paper designs a constant voltage frequency conversion control system, which consists of pump, inverter, soft starter, PLC, pressure transmitter, PID controller and so on. The working principle of the system is to change the flow rate of the system through the feedback of the pressure transmitter to the actual pressure, the operation of the PID controller, the change of the increase or decrease of the pump through the PLC control and the change of the speed of the pump by the frequency converter, so as to realize the constant pressure. This paper first analyzes the principle of constant voltage frequency conversion control, analyzes and selects several schemes of constant voltage frequency conversion, and analyzes the running process of constant voltage frequency conversion based on the selected scheme, and then introduces the hardware structure of constant voltage frequency conversion system in detail. Finally, the software design of constant voltage frequency conversion system is analyzed and explained. The constant pressure frequency conversion control system is designed for the test run system of large low speed two stroke diesel engine. The field debugging and operation show that the control effect of this system is good, and its constant pressure control idea can be popularized to test system temperature. In constant liquid level control.
【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TK427

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本文編號：2264351