Located in the monitoring room of the Tundian Pumping Station in the northwestern suburb of Beijing, Wang Hao, an engineer from Hefei Sanli Automation Engineering Company, looked at the rushing Jingmi diversion canal outside the window, while watching his colleagues debugging the control cabinet communication from time to time. Hefei Sanli is one of the largest automation integrators in the domestic water conservancy field.
The Tundian Pumping Station is the first station of the 9-level lifting pumping station of the Beijing Miyun Reservoir Regulation and Storage Project, and it is also a part of the supporting project of the middle route of my country's South-to-North Water Diversion Project. In the mid-route main canal project of the South-to-North Water Diversion Project, where Wang Hao is located, Sanli in Hefei is also one of the most important electrical integrators of the gate station monitoring system.
In such a major national water conservancy project involving nearly 100 million people, stability, accuracy, reliability, and rapid response are the primary requirements of the monitoring system. How to choose a set of excellent automation control solutions and how to find a trustworthy automation equipment supplier is the focus of Hefei Sanli's up and down and even the engineering construction management team—Siemens quickly entered their field of vision.
After the Miyun Reservoir's storage project is completed, the Fuyu Nanshui from the Danjiangkou of Hubei Province will be transported back to the Miyun Reservoir through the Jingmi Diversion Canal for storage.
The picture shows the Jingmi Water Diversion Canal.
Smooth and precise automationThe main canal project of the middle route of the South-to-North Water Diversion Project is mainly open canal, which uses the water level difference between the north and the south to achieve artesian flow. It starts from the Danjiangkou Reservoir in Hubei at the junction of Hubei and Henan in the south, and goes all the way north to Tuancheng Lake in Beijing and the Outer Ring River in Tianjin, with a total length of 1432 kilometers.
As a large-scale water transfer project across river basins and long distances, it is responsible for the major task of supplying water to 19 large and medium-sized cities including Beijing, Tianjin, Shijiazhuang, Zhengzhou and more than 100 counties and cities.
In addition to ensuring normal water delivery, the main canal project must also consider issues such as engineering safety, water quality safety, flood control and early warning, and operation management. Therefore, it has the characteristics of high automation control system requirements, strong real-time performance, and complex system. It needs to realize real-time automatic closed-loop control of numerous control gates, working gates, retreat gates, and diversion gates along the line.
According to the water supply situation of Danjiangkou Reservoir and the water demand application along the way, the water dispatching system determines the real-time dispatching plan. The gate station joint control model gives the opening control instructions of each gate according to the dispatching plan and the current channel water supply status. The gate station monitoring system will automatically send these instructions to the corresponding gate hole to control the opening and closing of the gate. After the instruction is executed, the channel water delivery status will also be fed back to the gate station joint control model, and a new correction instruction will be proposed until the scheduling index is balanced and the closed-loop automatic control is formed.
Hefei Sanli and Siemens implemented an automated monitoring system for the Diaohe to Chuanhuang South section of the trunk canal project, which occupies about 1/3 of the trunk canal length. Among them, 82 sets of Siemens SIMATIC S7-400 control cabinets (including remote 1/0 of the step-down station) realize precise automatic control of 82 on-site gate stations to keep the water flow stable.
"Such a large-scale water transfer project requires very high control accuracy. For example, the common hydraulic gate lifting accuracy requires millimeter-level design in order to achieve the design water level control before the gate. Siemens equipment can achieve this very well. The technical requirements to help realize the reliability and stability of the automation system." Wang Hao said.
Among these control cabinets, 34 sets of trunk canal main gate stations use CPU412-5H for redundant systems, and the remaining 48 sets of trunk canal branch gate stations use CPU412-2 for non-redundant systems. Siemens also provides 216 sets of distributed remote I /O module.
Through the construction of automatic facilities such as on-site monitoring and control, remote monitoring and control of the retreat water information and operating status of the monitoring gate station are realized. The SIMATIC S7-400 control system guides the north-south waters. Redundant configuration, reliable products, and high-quality services make the journey to the north and south water smarter, safer and smoother.
In addition to the control equipment, Siemens also provided 12 sets of large-diameter electromagnetic flowmeters for the Shijiazhuang-Beijing section of the main canal, with diameters ranging from DN800 to DN1600, providing a safe and stable measurement of the amount of water entering Beijing.
Siemens control equipment automates the control of the water pump, helping to increase the pressure of Nanshui. The picture shows the Tundian Pumping Station of the Miyun Reservoir Regulation and Storage Project.
Fast and reliable data transmissionNanshui arrives at Tuancheng Lake in Beijing. After meeting Beijing's water demand, if there is still surplus, it will be transported 103 kilometers through the Jingmi diversion canal to the Miyun Reservoir for storage.
Due to the high terrain of the Miyun Reservoir, the surplus Nanshui has to be pressurized by a 9-stage pumping station, and the "climbing" high station adds rice before it can be drunk into the "belly" of the Miyun Reservoir.
Compared with the gate station control on the main canal, the pump station monitoring of the Miyun Reservoir storage project under construction is more complicated. It must realize on-site electric control and remote automatic control of related equipment such as water pumps, valves, gates, and sewage cleaners. At the same time, it must quickly and reliably collect water level, flow, pressure, operating status of electromechanical equipment, gate opening and closing status, and current. , Voltage, temperature, various protection information and alarm information, etc., and monitor the main electrical parameters.
"In addition, the water quality information of important control points in the water delivery process must be quickly collected and transmitted in real time, as well as engineering safety monitoring of seepage pressure, soil pressure, joint measurement, and groundwater level, with high frequency and large amount of data." Hao said.
"Therefore, we adopted about 60 sets of Siemens process control system SIMATIC PCS 7 AS410, and at the same time integrated Profibus and Profinet Ethernet interface in communication, which is especially suitable for this kind of environment with many process variable monitoring requirements, and the performance is completely Meet or even exceed engineering needs." said Jiang Houxiang, project director of Hefei Sanli.
The SIMATIC PCS 7 AS410 control equipment is not only stable and reliable, but also has a fast response speed. It is fully capable of achieving the status point collection cycle of less than 1 second, and the time for collecting data to the remote database is less than 2 seconds, and it is highly reliable. The average time between failures of the CPU module is greater than 100,000 hours, and the system utilization rate after commissioning is greater than 99.9%.
In the monitoring system of key facilities such as Zha pumping station, redundancy is a major challenge, and it is also one of the fundamental guarantees for protecting equipment and reliable data transmission. SIMATIC PCS 7 AS410 has a dual-system hot standby and redundant field bus structure, that is, the rack, power supply module, CPU module, synchronization module, etc. adopt exactly the same configuration, and the network communication also adopts the redundant configuration. In this way, even if one segment of the network fails and terminates the work, another segment of the network will be activated to make the communication function unblocked.
In automation engineering projects, the cause of data communication failures is often the communication problems between different automation products from multiple suppliers, or the integration problems between the new pumping station and the original gate station equipment.
"We need to solve the integration and communication between the newly built pump station and the original gate station monitoring equipment and instruments in a very short time, and the system compatibility should be good." Wang Hao believes that this is also the realization of fast and reliable data transmission. A challenge.
The SIMATIC PCS 7 AS410 controller is connected to the industrial switch through the redundant Modbus-TCP upwards, and then realizes the function of third-party industrial computer data monitoring and recording. On the other hand, the status information of the gate opening meter, electric actuator and other instruments based on various communication methods collected on site is uploaded to the distributed I/O slave station through RS485 Modbus, and through the redundant Profibus-DP protocol Transfer to the controller.
The strong compatibility of Siemens equipment comes from the function library provided to support third-party communication, which enables the controller to seamlessly access the network of third-party equipment, and a compatible network can ensure a compatible system.
In addition to the Miyun Reservoir storage project, Siemens has also participated in a number of supporting projects for the middle route of the South-to-North Water Diversion Project in Beijing and Hebei together with Hefei Sanli. For example, the automation project of Beijing Shuiyuan No. 10 Factory also adopted 14 sets of Siemens SIMATIC PCS 7 AS410 control equipment.
At the Tundian Pumping Station, engineers are discussing the debugging of Siemens equipment.
China has floods in the south and drought in the north. The South-to-North Water Diversion Project, which lasted for more than 50 years, is not only a huge global water conservancy project, but also witnessed the tremendous changes in my country's economy and society. The winding water veins stretch for thousands of miles and need advanced and reliable automated control systems to escort them. Here, Siemens is showing its talents.
Adapter Ring,Ring Camera Adapter,Lens Adapter,Camera Adapter
Shaoxing Shangyu Kenuo Photographic Equipment Factory , https://www.kernelphoto.com