Application of Pump Station Automation Control System 1. Project Introduction The Pump Station establishes an independent and fully functional on-site automatic control system and a centralized monitoring and control room to realize the automatic operation control of the pump station. The operation of various equipment in the pumping station is directly controlled by the on-site control system of the pumping station. The on-site control system of the pumping station is controlled according to the working conditions of pumping stations such as liquid level. The pump station receives the global operation data and control instructions downloaded by the central monitoring and control system of the sewage treatment engineering as the condition parameters of the automatic control of the pumping station so as to meet the flow-based control stipulated by the central monitoring and control system of the sewage treatment engineering. 2. System composition Pumping station system adopts hierarchical control structure, the system is divided into three layers: Information layer: Monitoring Computer control layer: PLC and remote IO substation Equipment layer: valves, pumps, flow meters, water level meter and other field equipment As the season All kinds of pumping stations will adopt different operating modes in different seasons. The annual operating mode of the pumping station is as follows: Mode 1: When the dry season is no rain or when it is early to rain and has not exceeded the intercepted water flow, only the shut-off sewage pump runs alternately or Full load operation. Mode 2: When it is early and has exceeded the intercepting water, the intercepting sewage pump runs at full capacity and the rainwater regulating tank is enabled. Mode 3: The rainfall continues, the rainwater conditioning pool has been full, shut-off sewage pump at full capacity, rainwater pump began flood control operation. Mode 4: the end of the rain, the rain pump outage, regulation pool began to vent, only the interception of sewage pumps alternately. Mode five: the rainy season without rain, rain pump test, shut-off sewage pump temporarily stopped running. Six modes: pumping station overhaul. 3. System Features The system is reliable. System economy. Achieve monitoring of all instrumentation and electromechanical equipment, including pumping stations and other facilities. Improve the data collection. Safe operation monitoring. Realize automatic control, reduce the labor intensity of pumping station operators and improve the safe operation level. 4. Systematic solution Sewage pump house and rainwater pump house control are relatively independent, set up their own based on programmable logic controller (PLC) composed of sewage pump control subsystem and rain pump control subsystem. Substation set up an independent automation control system and control room and connected to the computer system. In the control room set up two monitoring computer (one with a prepared) to manage and coordinate the work of the various subsystems, the display and keyboard constitute the pumping station in situ control system interface. The sewage pump house and the rain pump house PLC are respectively responsible for the communication with the sewage treatment project central monitoring station and the urban drainage information system. Monitoring computer, sewage pump control PLC, rain pump control PLC, transformer substation automation system data concentrator and other equipment using industrial Ethernet (Ethernet) interconnection. PLC and pumps, gates and other mechanical equipment between the control box using DeviceNet bus interconnection. Instrument analog and pulse signal is transferred to DeviceNet via remote I / O module. The communication between the pumping station and the central monitoring station of the sewage treatment project uses two channels: the common channel adopts the city digital data network (DDN); the standby channel is the wireless communication channel and is transferred to the sewage treatment project located at the M2 pumping station via the SA pumping station Central monitoring station. Communication protocol using IEC60870.5-101, non-balanced transmission mode, polling method to achieve every change is reported. Pump stations and urban drainage information system commonly used means of communication for wireless communication, standby for dial-up telephone lines. Sewage pump room control in three layers to achieve, that is, central control, local control and basic control. Rainwater pump room without central control, only local control and basic control. Central control level: The central control level provides systematic macro-control and maintains the overall coordination of the system. The (remote) central control room of the sewage pump house of this project is the central monitoring station located at M2 pumping station. Central control room to the pump station for remote data acquisition and operating parameters set, but does not directly control the pumping station equipment. Local control layer: local control priority than the central control, the use of PLC's logic control functions, to provide automatic control of equipment and associated equipment linkage, chain control. The local control interface of the project is the monitoring computer screen of the centralized control room. The PLC can automatically control the field devices according to the instructions issued by the monitoring computer and the pre-established rules and regulation methods. Basic control level: The basic control has the highest control priority. When the control box of the operation box of the device is in "manual operation", the control commands issued by the monitoring computer and PLC are shielded. The on-site devices can be realized on the power distribution screen or the control cabinet Manual operation and inspection. These distribution panels or control cabinets need to provide basic control interlocks or interlocking. 5. Software Application The supervisory control of pumping station automation monitoring system is developed and realized by CloudControl configuration software and an independent and fully functional rainwater pumping station and sewage pumping station unified control system is established with centralized monitoring and control room to realize automation of pumping station Operation control functions, including the main functions of the monitoring system, including real-time detection of various data, regular print data statements, query historical data, alarm information, display flow curve. System Graphical Display Interface The display interface of pumping station monitoring system is divided into main control platform, power station detection, alarm inquiry, report browsing, system maintenance and system running according to the function. First, it enters the main control platform interface, which can display the whole pumping station All devices information, click on each device to view the details of the device, the power station test interface can display the system electrical connection network diagram, alarm query and report browsing interface can view the alarm situation and historical data browsing curve of real-time data. In the main control platform contains all the pumping station sewage pumps, rain pumps and grilles and other parameters of the various types of information on the various pumps, gates and grilles, and so on. 1, the start and stop of the pump and the main parameters: "pump monitoring" window shows the pump current running status, the cumulative running time and frequency, current value, frequency value, speed value, cumulative flow and other parameters; The pump for remote start-stop control. 2, the start and stop the gate and the main parameters: "gate monitoring" window shows the current state of the gate, the cumulative running time and the number of parameters such as information; but also to the gate for remote control. 3, the main parameters of the grille: "grille monitoring" window shows the current status of the grille and other parameters of the information. 4, "Rainwater discharge operation" and "Sewage discharge operation" window contains a variety of rainwater or sewage discharge mode of operation. Data Acquisition The system automatically processes the process of data acquisition and storage, data sampling period of less than 100ms, of which the important parameters of the unit is divided into two categories by nature. (1) Switch parameters: The source of these parameters is PLC, such as: unit control start, stop, gate switch, etc .; (2) Flow parameters: . Such as: unit winding temperature and bearing temperature. PC for different devices were data acquisition, PLC equipment, use only need to add equipment and some parameters set, we can achieve the information transfer. According to user requirements for different data processing, dynamic display or save to the database. The report form is an important function of pump station management. The system requires the host computer to schedule or summon an automatic report form. The designed report includes: the operation log of all units in the pumping station; statistical reports of sewage and storm water flow (divided into year, month and day Statistical reports); fault alarm reports. 6. Conclusion The system has perfect monitoring and control functions of pumping station to meet various requirements of safety monitoring, control regulation and production management. The operation of the site is stable and reliable with economic and energy saving, greatly reducing labor intensity of pumping station operators. Man-machine interface configured by CloudControl has powerful automatic control and data management functions, and the entire monitoring system is stable and reliable, providing the ideal informationization solution for the user's pump station monitoring automation.
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