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1. Overview The 2×350MW unit of Huaneng Dandong Power Plant was contracted by the Westinghouse Company of the United States. The boiler was provided by British Babcock Company. The steam turbine and generator were provided by the American Westinghouse Company. The DCS system hardware and software adopted the WDPFII distributed control system of American Westinghouse Company. The entire system covers: DAS, CCS, SCS, BMS; DEH, UAM, By-PassECS and other functions. DCS system design, configuration, commissioning and on-site service, the two units completed the 168-hour trial run on November 23 and December 12, 1998 with an automatic input rate of 100%. At present, it has been invested in production.
II. Overall Structure and Configuration of DCS The DCS systems of the two units are each composed of 27 pairs of redundant 486DPUs, two non-redundant 486DPUs, five operator stations, one engineer, and one SUN/SPARC5 historical data station. Storage retrieval, a SUN/SPARC5 performance computing station, four Fustju3600k alarm printers, two laser printers, and one screen copy machine. In addition, there are two pairs of redundant DPUs to implement data transmission between the public system and #1 and #2 units. The functions implemented by each DPU are as follows:
#1 DPU steam feed Water Pump control, #2 ~ #4 DPUDEH system, #11 ~ #15 DPU, BMS system, #16 ~ #21 DPUCCS system, #22 ~ #25 DPU, #29 DPUSCS system, #26 ~ #28 DPUUAMBPS function, ByPass function Covered in CCS and SCS cabinets, ECS electrical monitoring functions are included in DAS cabinets, #30 to #35 DPUDAS systems, and #36 to 37 DPU public systems.
Third, system hardware equipment introduction 1. The 486DPU equipped with DPU's distributed processing unit is a process controller based on Intel486 introduced by Westinghouse. It can perform simple and complex continuous adjustment and sequence control. Data acquisition and I/O signal interface with the data highway, the DPU is equipped with a multi-speed processor, which can simultaneously control the lOms ~ 30s five configurations, speed, the resolution of the sequence of events recorded up to 0. 125ms. The new technology of 486DPU not only enhances the function of the system, but also brings great convenience to fault finding. A lot of real-time diagnosis and status information can be displayed on the DPU panel, and can also be displayed on the display screen of the operator station/engineering station. .
In the design of the I/O channel, the WDPF system separates the card cabinet from the terminal cabinet, and the field signal cable is inserted into the terminal cabinet and then plugged into the various card members through the prefabricated cables and the leading edge terminals. The leading edge terminals are inserted from the card members. Unplug the card to achieve the isolation of the site and the signal, so as to avoid the high voltage signal before the school line mistaken card and burn the card, so that the field wiring work and channel verification can be carried out at the same time, for the entire unit Drive start work for time.
Due to the lag in construction of the air conditioning and ventilation system in the computer room of Dandong Power Plant, the DPU cabinets are kept in a high temperature and high temperature environment for a long time. Because each card of the WDPF system is designed to adapt to higher temperature and humidity, the card itself adopts single The design of the laminate makes the natural ventilation in the cabinet better, so it does not affect the normal operation of the system due to high temperature and harsh environment.
2. WEStation Station The WEStation station is the collective name for the WDPF system man-machine interface station. There are four types of WEStations at Dandong Power Plant: operator stations, engineering stations, history/recording stations, and performance computing stations. Each station uses a common basic hardware and operating system to accomplish different application tasks. The WEStation station is based on SUN workstations and is equipped with rich application software to connect with the data highway and the Ethernet information highway. It collects information from the data highway. The Ethernet information highway interconnects WE stations into an information management network. For file transfer, software download and historical data retrieval, the combined use of these two highways greatly enhances the communication capabilities that are needed for decentralized control and information management.
3. Hardware devices connected to other control systems Each subsidiary system of Dandong Power Plant adopts the PLC-5 series programmable controllers of AB Corporation to effectively send the main status parameters of each ancillary system to the main control room so that the operators can learn about each The operating status of ancillary systems, WDPF system uses QLC cards and dedicated communications software and programmable controllers to achieve data transfer. The WDPF system also implements data transmission through Ethernet and routers and electric drive professional SCADA systems.
Fourth, software configuration 1. The DPU station DPU station does not require an operating system. The software for each DPU's station is divided into the following three categories: ("Standard plant software: Used for configuration database, continuous control, ladder logic, graphic display, historical data storage and Search; (2) Communication software: used to connect with external devices; (3) Self-diagnosis software: On-line testing of station status and system communication status.
2. WEStation Station The WEStation station system uses the real-time, multitasking U-NIX operating system, and the version is Chinese Solaris 2.3. In addition to the basic WEBStation software package, each station is equipped with different software packages according to the functions implemented by each station.
3. Software System Upgrade With the rapid development of computer technology, the software of the WDPF system is also continuously upgraded. With the help and support of Westinghouse, the operating system developed by our company has been upgraded from Chinese Solaris 2.3 to Solaris 2.5, and the Westinghouse operating system is also composed of 8. Version 5 was upgraded to version 8.6. After the upgrade was completed, the Y2K problem was solved accordingly.
V. Problems and Solutions in the Debugging Process 1. The UPS power supply was de-energized. In the debugging phase of the #1 unit of our plant, the W1) PF system's second power supply was not put in time. When the construction unit pulls the cable inside the DPU switchboard, it accidentally touches the iron wire on the UPS bus, grounding the UPS outlet busbar, and de-energizing the running WDPF system. Therefore, to ensure the safe operation of the WDPF system, it is recommended that the second power supply be timely implemented. Put into use.
2. The data highway must be handled with care when connecting data highways due to the carelessness of the construction unit in grounding the data highway and destroying the data highway joints until the system data highway is interrupted.
3. The installation and use of the QLI card was checked during I/O channel testing at the initial stage of debugging. Several pieces of the QU were damaged. After analyzing the reason, due to the particularity of the QLI card, once the cable connecting the QLI card output signal terminal is grounded, it will cause For the damage of the card, we took corresponding measures; we connected the insurance of the B cabinet to the output of the card.
4. The operator station started the #1 unit No.202 operator station and had several automatic shutdowns and restarts during the trial run. After the WDPF expert replaced the 32M memory bar of the station host, this phenomenon did not occur again.
5. The operating speed of the printer The operating speeds of the two operator stations connected to the alarm printers of the #1 and #2 units of our factory often slow down. The preliminary analysis is that all alarm priority alarms are printed by a printer, and the printing speed cannot keep up. The speed of the alarm, so that a large number of alarm information can not be printed out in time, thus taking up the memory of the operator station, and affecting the speed of the station.
VI. Concluding remarks At present, the two units of our plant have been put into production for nearly two years. The WDPF system has ensured the safe and stable operation of the two units with its powerful functions. According to our experience, a lot of meticulous work must be done during the installation and commissioning phase of the DCS system and the manufacturer’s manufacturer’s specifications must be strictly enforced. Only in this way can the DCS system perform its intended function. 
It is widely applied for pesticide control of foodstuff,cotton,vegetables and orchard as well as environment sanitization and epidemic prevention of publics,hotels,stations and feeding site of poultries and livestock.
Application of WDPFII System in Huaneng Dandong Power Plant
Huaneng Dandong Power Plant #1 and #2 units are 2×350MW. The DCS project adopts the WDPFII decentralized control system of American Westinghouse. This article gives an introduction to its system architecture, configuration, hardware and software applications, system features and debugging experience.