First, system overview
Global energy is very scarce. In order to respond to energy conservation, environmental protection, and emission reduction, countries around the world are vigorously accelerating the development of nuclear energy, and China will also vigorously develop clean power. Nuclear power is the main direction of future national power structure adjustment, and the scale of investment will greatly exceed that of conventional power plants. . The state's strategy for the development of nuclear power plants ranges from "moderate development" to "positive development." In this context, China’s nuclear power will have good opportunities for development.
According to the “12th Five-Year Plan†proposed by the National Energy Administration, the “12th Five-Year†energy plan should reflect the principle of giving priority to the development of new energy and renewable energy. Among them, the development of nuclear power plants should promote inland nuclear power projects and form the East-Central nuclear power zone.
The development of nuclear power plants has effectively stimulated the rapid development of the nuclear power equipment industry. At present, the overall localization rate of nuclear power plants in China is about 50%-60%, and the localization rate is planned to be greater than 80% by 2020. According to the calculation of the installed capacity of more than 70 million kilowatts, the total investment in China's nuclear power will reach 1 trillion yuan in the next 10 years. Nuclear power equipment accounts for about 60% of the investment in nuclear power plants, and equipment investment is about 600 billion yuan. If the localization rates of nuclear islands, conventional islands, and auxiliary equipment are calculated as 70%, 80%, and 90% respectively, domestic nuclear power equipment manufacturers will share more than 320 billion yuan of market, and the market has great potential.
Second, the system description
Nuclear power plant digitization instrument control system controls almost all valves, switches, relays, etc. of nuclear power plants from conventional islands to nuclear islands. The data is displayed centrally in the system, calculated and processed, and automatically drives actuators, with high reliability and openness. Flexibility, coordination, easy maintenance, complete control functions and other features. It is the brain, nerve center, operation center and safety barrier of a nuclear power plant. It is the most important and core technology embodied in the entire nuclear power plant. It is the carrier of key nuclear power plant technology and an important indicator of the degree of modernization of large-scale nuclear power equipment. It is the four major nuclear power plants. One of the key sets of equipment.
As a nuclear power plant, a high-tech major equipment that uses a nuclear reactor as a primary energy source, its control system is closely related to the nuclear reaction process. The functions and performance of the control system, such as its safety, reliability, accuracy, and integrity, are directly affected. Because of the safety and economy of the entire nuclear power plant operation, when considering the autonomy of the nuclear power unit equipment itself, it is impossible to consider the autonomy of its control system at the same time.
As the nuclear power plant control core control system was previously conventional equipment, the use efficiency is relatively low, and the maintenance cost is very high. Nowadays, with the rapid development of digitalization, information, automation, and networking in the world, the application of DCS to nuclear power plants is increasing. Domestic nuclear power producers actively respond to the national requirements for accelerating the localization of nuclear power DCS, and EVOC MEC-5007 uses high Features such as performance, low power consumption, big data processing, high reliability, remote maintenance, etc., have had the privilege of undertaking the NC-DCS control equipment and gateway node unit for non-safety nuclear power plants. The following is the NC-DCS system description:
Non-safety factory-wide digital instrumentation control system (NC-DCS)
This system is a fully digital instrumentation control system developed for a nuclear power unit of a 1000kW PWR nuclear power plant. It mainly includes the following subsystems:
Helium reactor protection system
ïµSafety special control system
ïµ Reactor power control system CCS
ïµSafety-VDU in the control room and RSS
Remove nuclear island control systems other than CCS
Conventional Island Control System
ïµKIC system
Large screen display system POP
Backup operation panel BUP (including PAMS)
NC-DCS system features:
ïµSoftware component design, design of standardized software module interface, based on internal software bus, software configuration on demand
ïµ Strengthen the self-diagnosis design, using the combination of hardware Watchdog and software task diagnostics to detect failures in case of serious equipment failures
ïµ Separate control network data and application service data according to the two-tier network structure of FCS Net and KIC Net to reduce the impact of man-machine operation on real-time automatic control systems
ïµ Provides a variety of redundant and fault-tolerant designs, using dual redundant designs for important system components such as power supplies, networks, IO buses, control station CPU modules, real-time servers, and historical servers. Uses bus- and software-based data synchronization design to ensure uninterrupted switching
ïµ Use C/S to separate data services and data applications
ïµData transfer based on deterministic real-time networks to reduce the instability of control cycles due to network delay
ïµ Provide Level2 algorithm function, can achieve global operations in Level2, such as the plant status, safety parameters, performance calculation, global alarm and other functions
ïµ Open data interface providing universal data interface based on Ethernet and serial links
ïµ Through FMEA analysis and statistical data analysis, identify key components and links that affect system reliability and improve overall system reliability
ïµProvide over-voltage, over-current, filtering and other IO interface protection circuit design to prevent transient signal damage to IO channel
互连 Interconnect signals related to control or interlocking logic between different control stations are hard-wired and considered for isolation; electrical separation is used for signal and communication interconnection of different system partitions or different security levels
ïµ Control and interlocking logic implementations take into account the unique diagnostic and fault tolerance capabilities of digital systems
(NC-DCS system topology diagram)
NC-DCS system requirements for IPC:
ïµ Fully sealed fanless, high performance, low power control unit;
åŠ å¼º Strengthen the self-diagnosis design, and timely detect faults in case of serious equipment failure;
ïµ Provides a variety of redundant and fault-tolerant designs, using dual redundant designs in important system components such as power supplies, networks, IO buses, control station CPU modules, real-time servers, and historical servers;
ïµ Based on deterministic real-time network data transmission, to reduce the instability of the control cycle due to network delay;
开放 Open data interface and high security performance;
方便 Convenient remote maintenance, easy maintenance and easy integration;
Third, the conclusion
DCS Best Processing Unit Recommendation: EVOC MEC-5007
Product Information: http://
Because the price of nuclear DCS products is very expensive, the manufacturing process of nuclear-level automation products is very complicated, and the reliability of the system is very high. It is a very urgent technology for domestic production. The manufacturing technology of this product is mastered, and the automation field is upgraded to a new one. Realm, and can save a lot of money.
It can be said that the nuclear power plant is the wisdom of human beings, and as the DCS of the nuclear power plant that controls the nuclear power plant represents the highest level of scientific and technological level. With the continuous development of computer technology and information automation technology, intelligent control maintenance and technical management (Intelligent control maintenance and technical management The intelligent control system integrated with management system (ICMMS) has become the development direction of the power station instrument control system. The control unit of such a control system is no longer a simple sensor and controller, but an intelligent self-agent with certain autonomous control, data management and communication capabilities. The industrial control computer is used as a nuclear power DCS domestic control unit. It also highlights its importance. It is believed that through our unremitting efforts, China's nuclear power business will mature gradually. At the same time, the products of EVOC will also exert its due power for the localization of nuclear power control systems.
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