【Daily Question 20090421】Which industries use DCS for power management and load distribution in their process control?
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As we all know, in process industries, the ultimate objects of automatic control are usually the media involved in the production process, such as oil, gas, water, etc. DCS and PLCs are used to communicate with the instruments and valves on site in order to enable monitoring. So, for electricity, which is equally important, is it necessary to use DCS, PLCs, or RTUs for monitoring? Do you have any examples of this? Please share your opinions or examples. These examples can be either product cases from manufacturers or real-world scenarios from actual installations. A reminder: you can draw parallels with the relationship between substation automation and DCS when discussing this topic. We hope everyone will express their thoughts freely, participate actively, and that valuable insights from those who take part in the discussion will be highly appreciated. Encourage originality. This post was last edited by wopale3 on 2009-4-21 at 11:09.]
Similar to the DCS systems used for automation in production processes, the electrical engineering field also has an Electrical Monitoring System (ECS). Thermal power generation units widely employ Distributed Control Systems (DCS) to carry out the monitoring, control, regulation, and interlock protection of boilers, turbines, as well as auxiliary equipment for these systems, thereby achieving automated operation control of the thermal systems. For electrical systems, in recent years, new large-scale generator sets as well as those that have been upgraded have gradually incorporated their control functions into the DCS, thereby creating an electrical control system (ECS) with relatively independent functions. However, in most engineering designs, traditional hardwired \"one-to-one\" control methods for high-voltage systems are still used; signal information regarding switch positions and control commands are sent directly to the DCS’s DI and DO cards via hard wiring. Electrical analog values such as voltage, current, and power are converted into 4–20 mA current signals using transmitters before being fed into the DCS’s AI cards. The DCS’s distributed processing units (DPUs) and I/O cards are used to carry out the measurement and control of important electrical equipment. The electrical control system implemented in this way remains a narrow sense of ECS; the electrical system is merely integrated into the DCS from a production process perspective, but it still has significant weaknesses in terms of implementation: it relies on a large amount of secondary wiring, resulting in high costs, and its accuracy and resistance to interference cannot be guaranteed. Other computer control systems related to electricity also include: electrical security monitoring systems ； The computer-based monitoring and management system for power distribution can enable unattended operation of the power distribution rooms, and it provides the three remote functions for the entire system: remote measurement, remote signaling, and remote control ；
For the electrical control and thermal engine control of a 15MW unit designed by the Guangxi Electric Power Design Institute that I was involved with, only Siemens’ PCS 7 DCS system was used.
Nanjing Keyuan uses the Euroland NETWORK6000 system. System integration. Now, Keyuan has developed its own MIS system to facilitate monitoring by managers
Apart from the widespread use of DCS in power plants, power demand-side management and power relay protection systems for industrial enterprise users can also serve as relatively simple DCS systems.