Long-distance water supply based on SCADA systemPipeline leak monitoring systemIt should be deployed in the dispatching center of the water plant and the multi-level management station under its jurisdiction as the basis for the dispatching platform of the entire connected water transmission project center. The dispatching center is responsible for the scheduling and operation of all management stations and water pipelines, as well as the storage, application, release, and management of production management data. At the same time, the corresponding software and hardware interfaces are reserved for the expansion of the long-term scheduling management scope.
The dispatching center deploys hardware equipment such as engineer stations, Ethernet backbone switches, and data servers, as well as multi-level plant and station intelligent scheduling models, intelligent disposal analysis software, intelligent evaluation and alarm software, application development tools and other software. The technical requirements for its system software are as follows:
The above picture shows the software login interface diagram of the long-distance water supply pipeline leakage monitoring system.
1. Intelligent scheduling model system
The dispatching system is configured with the long-distance water supply pipeline leakage monitoring system software customized and developed on the SCADA system platform, the intelligent scheduling model of the multi-level management station, which is used to realize the function of auxiliary decision support and expert scheduling, through the establishment of the system's water quantity model, hydraulic water quality calculation model and decision-making scheduling model, according to the water volume of the system, the calculation and decision-making model are used to analyze the scheduling scheme, and then produce a more economical operation scheme that meets the safety conditions, which is mainly composed of three models, namely the water volume model, Hydraulic models and decision-making models.
(1) Water volume ** model
The water volume of the transmission and distribution system is of great significance for arranging production plans and equipment maintenance plans, and emergency switching in case of accidents. Through the correlation analysis of the historical data of water consumption at each receiving point with weather, holidays, construction, etc., the water consumption value (including minutes, hours, days, tenths, months, etc.) is generated. Considering that the amount of water varies with the temperature (seasonal variation) and the time of residents, holidays will also affect the city's water demand. Therefore, it is necessary to fully consider the influence of various factors on the model, and classify and summarize the water demand function.
Selection of water volume model: At present, there are many methods of water volume, and according to the different processing methods of data, there are three types of methods commonly used in water volume: time series method, structural analysis method and system method.
(2) Hydraulic model
Establish a hydraulic calculation model for water transmission between the water receiving plant and the management station, and its principles and models should mainly include the following contents.
The hydraulic model of the pipe network of the water pipeline leakage monitoring system is usually calculated by Manning's formula, that is, according to the dynamic and static information of the pipe network (including pipe sections, valves, pumps, water towers, etc.), the state equation of the pipe network (including the continuity equation, the energy equation and the head loss equation of the pipe section) is established, and then the flow, flow rate, head loss, pressure of each node, and the water supply and water supply pressure of each water source are obtained. After Zui, the obtained calculation results are compared with the monitoring data, and if the error does not meet the requirements, the relevant parameters of the model are corrected accordingly.
(3) Scheduling decision-making model
During the operation of the system, the flow rate changes with time, and the change of flow rate leads to the change of water level or pressure at each node. In order to ensure the high efficiency of the system, it is necessary to correct the operation frequency or combination of the control gate and the status of the regulating equipment at each receiving point in time.
The daily dispatching should be based on the two indicators of water level and flow change, and the efficiency of the raw water transmission and distribution system should be optimized. According to the measured flow, water level and opening data, the daily dispatching invokes the real-time dispatching instruction to generate a model, quickly calculates the flow rate and gate opening of each pumping station at the next moment, and forms the corresponding dispatching instruction.
2. Computer-aided scheduling
Computer-aided dispatching system is an automatic information management system that applies modern information technology (including new technologies such as automatic detection, modern communication, computer and automatic control) to monitor and analyze the main equipment and operating parameters that affect the whole process of water transmission, proposes the basis of dispatching control or implements a reference scheme, assists water dispatching personnel to grasp the actual operating conditions of the water distribution system in a timely manner, and implements scientific dispatching control, mainly including SCADA system and dispatching management system.
The main tasks of the long-distance water supply pipeline leakage monitoring system based on SCADA system - computer-aided dispatching system are: to collect the data and parameters required for the whole process of water transmission production and scheduling within the scope of water supply engineering, including process operation parameters and electrical parameters such as water quantity, water pressure, water quality, water level, and electricity; Parameters of the main process equipment operating conditions. Complete the preprocessing, archiving, display and printing of the operation data, and at the same time, the data of the water plant and management stations at all levels should be provided to the GIS management information system, the dynamic network of the pipeline network and the hydraulic model system and the intelligent scheduling model system of the multi-management station through the communication system, and the optimized scheduling operation instructions will be sent to the remote station of the SCADA system through the data communication system or issued manually. Its specific implementation functions are as follows:
The above picture shows the GIS management information system of the leakage monitoring system of the long-distance water supply pipeline.
1) Data remote communication function.
2) Data management function.
3) Monitoring and alarm function.
4) Scheduling function.
5) Event processing function.
3. Intelligent disposal analysis system
The intelligent disposal and analysis system of SCADA system mainly deals with the accidents that occur in the leakage monitoring system of long-distance water supply pipelines, and establishes a complete system of accident identification, accident damage assessment, response plan, switching effect evaluation, and plan implementation steps. Including accident identification, accident assessment, accident plan library, plan implementation effect and impact assessment, plan hydraulic simulation and analysis, plan operation plan, which need to include the following main functions:
1) Emergency data collection: collect emergency-related early warning module information, on-site data collection (emergency detection, on-site data image transmission).
2) Emergency response and management: according to the information provided by the analysis and evaluation, complete the emergency plan start and release, emergency information reporting, linkage and rescue command and other scheduling functions, and generate an incident disposal process report after the emergency disposal is completed.
3) Emergency training and drills: Emergency training drills need to have the functions of emergency training and drills, mainly to train dispatch management personnel, enhance risk prevention awareness, and improve the emergency command ability of the system.
Fourth, intelligent evaluation and alarm system
Pipeline leakage monitoring system - intelligent assessment and alarm system After obtaining rich real-time data through data acquisition and transmission equipment RTU, the intelligence is divided into two levels, one is a simple underlying alarm judgment evaluation. Establish alarm boundaries for the safety of processes, equipment, and water quality, and send real-time alarm signals when the monitored data is out of the boundary; The second is the statistical analysis and correlation processing of data, which provides basic data support for system evaluation, scheduling, energy consumption management, etc.
The picture above shows the software alarm interface of the long-distance water supply pipeline leakage monitoring system.