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First, TXP system control range 1. DAS (including peripheral system alarm/display signals)
The OM screen is divided into 11 functional areas and 166 frames (excluding curves and bar graphs).
2. BMS (all functions except the group control of the local oil gun group), SCS
Including group control 4, subgroup 34, standby interlock switching function group 21. CCS
Including coordination, main steam temperature, water supply, furnace pressure and other control loops a total of 77 sets.
4. Light word alarm system (electrical: 167 points, thermal work: 144 points)
5. Electrical part 1) Control of 3KW/10KV switch 2) Control of 400V inlet switch of the whole plant 3) Generator excitation voltage/current regulation 4) Surveillance signal of 500KV/220KV 5) Monitoring signal of UPS and DC system 6) Diesel power generation The start-up and monitoring of the whole DCS total points 7831 points (electrical 1685 points, thermal control 6128 points)
Second, TXP system configuration and hardware configuration Configuration diagram (slightly)
2. System hardware configuration 1). Engineer Station (ES680) 1 set 2). Process Unit (PU) 2 Pairs (4)
3). One pair of service units (SU) (4)
4). Operator terminal OT6 only 5). AP cabinet basic cabinet 8
Expansion Cabinet 5
6). APF cabinet 2
7). Relay Cabinet 7
8). Ma Xilin Cabinet 14
9). Power Cabinet 230VAC Power Distribution Cabinet 1
230VAC/24VDC Power Cabinet 2
10). ET-200 Cabinet 1
11). Star Coupler 2
12). Big screen 1
13). Printer 5
14). Main clock 1
15). Optical cable 3 groups 16). Backup hard hand station thermal: M/ASTATION 27, ON/OFF 22 electrical: ON/OFF 47 17). Conventional indicator table thermal work: 11 only 18). Modem 1
19). PU/SU/OT UPS13
20). PU/SU/OT Manager 1
Third, the application of 1. Hardware After the DCS began to receive power on December 16, 1997, it ended at 168 hours for Unit #1. All Siemens modules did not fail due to quality reasons. Even if the main control room air conditioning system malfunctioned, the room temperature reached 40 degrees. The above can also work normally (at this time the large screen is turned off due to temperature protection actions), Siemens TXP hardware quality is higher.
2. Engineering design and application software The engineering and design unit of LNG Island is US S&L, which provides logic diagrams to Siemens based on BW and WH's control strategy and requirements. After many discussions and clarifications by Siemens, owners and S&L, B&W, and WH, and after making many reasonable changes to the original design logic, Siemens finally completed the design of related application software. During the whole debugging process, the logic changes of BMS, SCS, and CCS are small.
3. The operation of the system proved that the Siemens TXP system worked well, especially the CCS system control strategy has significant characteristics. After proper parameter adjustment, all closed-loop control systems meet the operational requirements, and the quality of the adjustment is basically good. Under 600,000 load, the system's load factor is: AP is less than 60%, PU is 17%, OT is 13%, SU is 12%, communication load rate is 8%.
1). The load change test was conducted at 168 hours before the automatic investment rate was 100% and the protection was 100%. During the commissioning of CCS, in order to test the coordination and adjustment of quality, the unit made variable load tests (automatically all inputs) several times, and the variable load rate was 10,000/min. The unit was all normal, and the DCS system had not experienced any communication blocking or crashes. Although this variable load rate has reached the advanced level of domestic 600,000 units, there is still a gap compared with the ministerial regulations. Currently Siemens is working with B&W and WH to optimize the system.
2). During the commissioning of the trip, due to operational reasons, or an important auxiliary trip, several times caused MFT or shutdown (maximum load of 673,000), DCS system is working properly.
3). Load rejection According to the requirements of the commissioning program, the unit must perform a 50% load rejection test to test the regulation characteristics of the turbine speed control system. DCS did not show any abnormalities during the test and during system recovery.
4). A single auxiliary machine tripped in the unit 168. The single steam pump was skipped twice because of the interruption of the 400VAC power supply. The shutdown accidents were successfully avoided. All parameters were within the allowable range. The DCS did not show any communication blocking. Such phenomena, the system is working properly.
3. Debugging problems and processing results 1) Due to incorrect S&L design, or carelessness during debugging, resulting in strong power (230VAC) string FUM and SIM module (Siemens switch module access voltage is 48VDC), burning Bad module 15 blocks.
2) The DCS system has been unable to confirm the alarm window or alarm signal phenomenon (but operation, display everything is normal), HOTLINE experts through the MODEM inspection found that: PU within the MAC stack area (ie, buffer) overflow, due to engineering design The corresponding buffer size is not set according to the size of the functional area (the default capacity of the buffer corresponding to each functional area when the PU is shipped is 2000), and the actual information of the larger functional areas such as the combustion area and the smoke area Buffer overflow occurs when the amount exceeds the buffer's default capacity, causing the alarm to be unacknowledged. After the resetting of the buffer capacity by the Siemens field experts, the problem was solved and no such problems have occurred since then.
3) On the morning of October 28th, all OTs after partial OT could not be operated. It took about 30 minutes. During this period, the unit brought 500 MW load. The automatic system and various protections were still working properly. The unit did not stop. During this period, the server unit (sU) switches to the redundant unit, and Siemens technicians return the OT to normal after the OT restarts. Siemens headquarters engineering service center through the MODEN test inspection, analysis, and Siemens field technicians to discuss and confirm the above phenomenon is due to SU hard disk failure. Later, Siemens headquarters sent experts to the scene to clarify the explanation. At the end of December of 1998, Siemens replaced the failed SU hard disk, and there was no similar phenomenon in the future.
4) OT5 has appeared two screen graying phenomenon, originally thought to be a crash phenomenon, the latter check is because the CR and OT connection signal cable is loose. After treatment, this phenomenon does not occur again.
Fourth, the implementation of the contract Siemens Corporation is a large company that focuses on reputation and user image. In the four years of the implementation of the I&C contract, this has been fully reflected. In 1993, when determining the principle for the drafting of the bidding documents for the I&C island of 2*600MW unit of No. 2 Plant, the control of the electricity used by the electric plant was not included in the DCS. With the improvement of the reliability of DCS and the need for electric centralized control, after the contract is signed, the owner requests that the control of the power supply of the electric plant and the monitoring of 500/220KV be put into DCS control. Due to the expansion of the scope of supply and beyond the scope of the contract, the increase in costs has been caused. However, Siemens did not interrupt the related work because the cost was not implemented. Instead, it immediately provided all the equipment for Units #1 and #2 as required, completed the corresponding engineering design, and provided related technical services. Among the many foreign manufacturers of the second factory, Siemens is one of the best manufacturers to cooperate with the owners.
After the commencement of construction of the second Yangtse works, the work progressed quickly. The work in each phase was completed several months earlier than the planned construction period. This required Siemens to deliver goods in advance, and the signing of the I&C contract was also delayed. Therefore, the pressure on Siemens is greater. After the owners negotiated with Siemens, Siemens timely adjusted the production plan and personnel arrangement, delivered more than three months in advance under the premise of guaranteeing quality, and finally made the total progress of Unit #1 more than six months ahead of schedule.
V. Technical Service Capability 1. On-site Technical Service Status Siemens has sent a total of 4 German experts (1 installation specialist, 1 DCS commissioning expert, 1 system administrator, 1 CCS commissioning expert) and 5 SPPA professionals Responsible for DCS installation, system restoration and debugging. Except the one exception that the OT screen cannot be operated, all the other issues are handled by on-site experts. Siemens experts have a high level of business and are proactive in their work. In order to cope with the progress of the owners' commissioning, they often work overtime on Saturdays, Sundays and evenings. During the period of 168, according to the proposal of the trial operation headquarters, Siemens experts were divided into three shifts and 12 hours of shifts, which formed a stark contrast among the experts of many companies. In particular, their work attitude and sense of responsibility won the respect of the owners. Mr. Alther was also named one of the thirteen outstanding foreign experts who served in China in 1998 for his outstanding performance and was received by Vice Premier Li Lanqing.
2. Technical Support Capability 1) Technical Expert Group (HOTLINE)
Siemens Germany Kasruer Development Group has an expert group, which is available to users all over the world and can provide services to users 24 hours a day. The experts guide users and on-site commissioning personnel through HOTLINE to perform system recovery, fault finding and troubleshooting, and can directly enter through MODEM when necessary. On-site DCS system. (Saturday, Sunday, October 28, these experts have been working, which is rare in Germany)
2) Domestic Partner Support Capabilities SPPA is a joint venture between Siemens AG and Nanjing Automation Factory (Siemens Holding in 1996) established in 1993. There are 40 technicians with bachelor's degree or above, which has been continuously trained by Siemens and domestically. The design and commissioning of the project has been independently designed (except for CC5 control strategy), manufacturing (DCS module provided by Siemens), and the ability to debug. After the actual test of the Yangsan Plant project, SPPA has been able to undertake normal training. Software modification, debugging and other technical services are a powerful support and guarantee for domestic users how to make good use of Siemens system.
3) Application of MODEM The on-site DCS system uses MODEM to connect directly with the German Siemens Development Department through international telephone lines. The Siemens experts can directly perform dynamic inspection and diagnosis on the DCS system of No. 2 Plant, helping users to eliminate faults and problems in a timely manner.
VI. Characteristics of DCS in Yangzhou No. 2 Power Plant:
1. The electrical plant system was first entered into DCS in China and successfully put into use.
2. The first application of the big screen, especially played a great role during debugging.
3. Many base controllers were cancelled and the scope of CCS was expanded.
4, using a remote l / O cabinet, that is, ET-200 to achieve control of the pump.
5. The powerful technical support of the HOTLINE expert group enables the user to shorten the troubleshooting time greatly, improve the availability coefficient of the unit, and improve the economic efficiency.
6. Use MODEM directly to connect with Siemens in Germany.
VII. Summary In summary, during the commissioning process of Unit #1 in Yangzhou No. 2 Power Plant, there was no accident caused by the shutdown or shutdown of the DCS due to a fault or abnormality of the DCS. Regardless of hardware, software, TXP system failure rate is low, high reliability, stable performance, strong functionality, hardware and software have matured, and technical services are good. According to the practical application of the TXP system in Yangzhou No. 2 Plant, we believe this is a preferred system that is worthy of promotion in power plant control.
Address: Ling Xiaoding, Engineering Department, Yangzhou No. 2 Power Plant, Jiangsu Province, China Postcode: 225131
Tel: 0514-7523000-5889
Application of TXP System in Yangzhou No. 2 Power Plant
The 2*600MW coal-fired unit of the Yangzhou No. 2 Power Plant was selected by public bidding through the use of a World Bank loan. The boiler was a product of the American Bally Company, the steam turbine was a product of the American Westinghouse Company, and the decentralized control system (DCS) was a new generation of the German Siemens company. DCS product TELEPERM-XP system. DCS #1 was powered for the first time on December 16, 1997, and was commissioned on March 10, 1998. After more than five months of debugging, the whole set of start-up was started on August 17, 1998, and was successfully connected to the network on August 19, 1998. For the first time on October 17, 1998, it was fully loaded and at 10:38 on November 12, 1998, the 168-hour full-load test run was completed and handed over to the production unit for trial production. By February 1999, the performance test of the turbine was completed ( VWO conditions), TXP system in Yangzhou No. 2 power plant configuration, contract implementation, practical application, as well as adjustments and other aspects of the test are summarized in several ways as follows: