subject: Large Thermal Power Plant DCS System Status feature-DCS, power plant, automatic - electrical industry [print this page] Large Thermal Power Plant DCS System Status feature-DCS, power plant, automatic - electrical industry
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The past 20 years, with global economic development, especially in process industry's economy growing rapidly, the demand for process industries, rapid growth accordingly. Instrumentation and automation systems gradually to digital, intelligent, network, integration and transition Field Instruments Now in 4 ~ 20mADC conventional instruments: HART Standard Instrument: Fieldbus Meter ratio of 5:4:1 output stage, while the automation system is DCS : PLC : IPC: SLP (including single-loop controller, paperless recorder, digital instrumentation) than for the 5:3:1.5:0.5 stage, in fact, in the medium and large process industry HART, FF, PROFUBUS-PA field instruments and the application of DCS ratio greater. This paper focuses on large-scale thermal power plant DCS, so the trend is always focused on automation systems and related technologies, and some ideas to be elaborated.
The development trend of power plant automation
end of the battle field instrument standards into engineering practice phase, the coexistence of multiple bus has been formed. FF Foundation Fieldbus technology initiative into the DCS system, or said: After certified interoperability FF DCS system is the main system. There are currently 11 companies registered in 20 main control system, covering most of the world DCS. This idea has been tested in practice works, and a consensus at home and abroad have been in power plant projects with field bus performance.
and Information Technology ( IT ) Fusion. In accordance with the COTS (commercial off-the-Commercialoff-the-shelfTechnology) principle, using Fast Ethernet technology (including TCP / IP, etc.) as a factory-level system, the main network infrastructure.
Functional safety technology in the actual process of industrial automation projects has become an integral part of a safety instrumented system (SIS) and the process industry safety integrity level (SIL) certification system is taking shape. SIS and DCS integration or compatibility of the trend has taken shape.
EDDL device description language and system integration technology, and formed the basis of this equipment management system (AMS) has become an integral part of the basic automation, and has gradually expanded the scope of assets management, including equipment, information platforms, intelligent device management system , machinery and equipment management systems, performance testing systems. Current asset management system the world has more than 1,000 sets of application, full life cycle of enterprise asset management and project management concept is emerging.
integration and control instrumentation, electronic control integration is unified under the framework of the gradual implementation, EPR / MES / PCS three-tier structure has formed a consensus, based on the progressive realization of automation and seamless integration of enterprise information management. Motor Control Center (MCC) and the business of electricity distribution systems and the use of intelligence in the basic module based on fieldbus technology and gradually incorporated into the temperature, pressure, flow and other signal-based instrumentation system.
The characteristics of thermal power plants with DCS
Large thermal power plant DCS to remove the common trend, there is inherent personality:
turbine, boiler control and safety requirements such as complexity, fuel, water, ash-related auxiliary facilities such as large electric power generated by the schedule demands of higher power, resulting in DCS for the plant should have a loop feedback control, sequential control, hybrid control and other complex control functions, has driven the requirements of various implementing agencies to complete the complex computing power and advanced control (APC) function.
As the sequence of events FSSS operation on record as demanding, and may be combined to complete the multi-system function, so SOE's with a time stamp of digital input devices and related functions must be available.
