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Units since the start and stop sequence control system (APS) is the highest level of the control system for thermal power generating units , which according to the needs of the unit at the start and stop at different stages of the process and greatly varying load conditions of the unit is a comprehensive , accurate , rapid detection and judgment , issue control instructions to the various sub- control systems or equipment , the unit can start in each state , until the steady load ; downtime or long-term and short-term ways to gradually fall to zero units in any load . APS application can be effective in reducing the consumption of the unreasonable fuel and working fluid , damage to reduce the impact of thermal stress on the main equipment of the unit and equipment failures , improve running economy and device security unit of energy saving and reducing pollution emissions . In this paper, a power plant 's Unit # 4 state fully automatic start and stop the research and implementation of the engineering background of the brief history of the development of the power plant thermal automation technology and power plant critical process , # 4 units each state to start the process characteristics , divided the necessary start-up phase and artificially determined point . A detailed analysis of the needs of each state of the power plant # 4 unit Fully automatic start and stop control systems engineering , the general scheme of the system design , hardware design and software functional design , including the allocation of system database , functional specification writing , logical groups state , site commissioning ; complete the design of the system configuration and the simulation machine debugging , including flowchart screen sequence step sequence , an important control loop configuration and debugging , alarms , trends , reports related process configuration and debugging. The self - start-stop control system project has been put into actual operation , and achieved good results , not only greatly improve the level of automated control and management of the # 4 units , as well as to ensure the stability of the production process , guarantee the efficient operation .
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