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分散控制系统 (DCS)在我国火电厂的应用日益增多 ,火电厂对DCS性能的要求也越来越高。为此 ,DCS生产厂家纷纷改进各自的产品。目前 ,经过改进 ,DCS的开放性更好 ;采用通用工作站 ;DCS与电厂的MIS网连接 ,成为管理、控制一体化的系统 ;采用光纤作为DCS局域网的通讯介质 ,传输速率快、通讯距离长、抗干扰能力强 ;DCS与PLC相互融合 ;软件进一步完善 ,实现了解耦控制、自适应、Smith控制、锅炉和汽机协调控制、电厂的负荷调节、控制等。由于现场总线控制系统 (FCS)的优越性 ,今后 ,火电厂的控制系统必将由FCS取代。
Decentralized control system (DCS) in China’s thermal power plants are increasingly used, thermal power plant on the DCS performance requirements are getting higher and higher. To this end, DCS manufacturers have to improve their products. At present, the DCS has been improved in terms of openness; the universal workstation is used; the DCS is connected with the MIS network of the power plant to become an integrated system of management and control; the optical fiber is used as the communication medium of the DCS local area network; the transmission rate is fast; the communication distance is long; Anti-interference ability; DCS and PLC mutual integration; software further improved, to achieve the decoupling control, adaptive, Smith control, boiler and steam turbine coordinated control, power plant load regulation, control. Due to the superiority of fieldbus control system (FCS), the control system of thermal power plant will surely be replaced by FCS in the future.