The Research And Realization Of Automatic Frequency And Load Conditioner In Marine Power Station Based On PLC

Automation of Marine power station is an important part in unmaned engine room,which is an issue that experts have been exploring and studying.In some developed countries PLC cooperated with computer has been used to control marine power stations,and automatic marine power stations have been realized.The subject of High Capability conditioner of Programmable Automatic Frequency and Load of marine power station is one of the Fujian Provincial university research projects.The research of the control of marine power station using PLC is a meaningful attempt and exploration for the realization and development of Chinese automatic marine power stations.The paper expounds the principle of frequency and load adjustment and the method for its realization.On the basis of a study of the development in the latest technology of marine electrical automation at home and abroad,we have adopted PLC to realize automatic frequency and load adjustment in marine power station.PLC automatically adjusts the frequency and load of marine power station through real time parameters obtained by means of sensors and data-collecting.Main contents in the paper are as follows:(1) Principle analysis of automatic frequency and load adjustment(2) PID adjusting principle and parameters tuning(3) Hardware design of automatic frequency and load conditioner(4) Software design of Automatic frequency and load conditioner(5) Alarm and IndicationThe device alarms in case of abnormal voltage or frequency .The research has been conducted in marine power station Dynamic Simulation Lab . All parameters were obtained from real synchronous generator on aboard. The frequency and load conditioner has been tested in two generators in the lab.Experiments show that the close point of the frequency and load conditioner is accurate;and when the load has a disturbance, the frequency and generator power of the power network will change ,the automatic frequency and load conditioner will stabilize the frequency and evenly distribute the power average for each generator.