Design of urban drainage pumping station management system based on platform

In recent years, waterlogging disasters occur frequently in Chinese cities, causing serious casualties and economic losses, which seriously threatens the safety of cities. Data show that from 2015 to 2018, the average annual number of flooded or waterlogged cities in China accounted for about 1/5 of the number of Chinese cities; People's lives and property also suffered serious losses, according to incomplete statistics, as of the first half of 2021, the number of people killed and missing due to flood disasters in China reached 26, causing economic losses of 13.5 billion yuan. On the one hand, we need to actively construct and manage drainage facilities; On the other hand, the establishment of urban flood control and drainage monitoring and early warning system. It can not only provide management departments with real-time information on the water level of urban rivers and roads, but also provide technical and data support for urban flood control management. Based on technologies such as the Internet of Things and edge computing, the pumping station remote monitoring system combines local self-control with big data remote monitoring platform to provide solutions for urban flood disaster monitoring, waterlogging early warning and management.Data show that from 2015 to 2018, the average annual number of flooded or waterlogged cities in China accounted for about 1/5 of the number of Chinese cities; People's lives and property also suffered serious losses, according to incomplete statistics, as of the first half of 2021, the number of people killed and missing due to flood disasters in China reached 26, causing economic losses of 13.5 billion yuan. On the one hand, we need to actively construct and manage drainage facilities; On the other hand, the establishment of urban flood control and drainage monitoring and early warning system. It can not only provide management departments with real-time information on the water level of urban rivers and roads, but also provide technical and data support for urban flood control management. Based on technologies such as the Internet of Things and edge computing, the pumping station remote monitoring system combines local self-control with big data remote monitoring platform to provide solutions for urban flood disaster monitoring, waterlogging early warning and management.

 

Classification of urban pumping stations

According to the application scenario, urban pumping stations can be divided into three categories: drainage pumping station, sewage pumping station and water supply pumping station. Drainage pumping station is mainly used for drainage and waterlogging pumping station; Sewage pumping station is used to transport domestic wastewater; The water supply pumping station is mainly used for urban life water supply. These three types of pumping stations are essential for urban operation, and how to make pumping stations efficient, safe and low-consumption operation is the first issue that managers need to pay attention to. Pump station management platform provides solutions for urban pump station management through on-site monitoring and control sensors, edge computing, cloud platform combined with local PLC.

 

Electrical design of urban drainage pumping station

According to DJG 08-22-2018 "Urban Drainage Pumping Station design Standards", drainage pumping stations generally use 35kV or 10kV power supply according to power demand and local power supply conditions. The load grade of urban drainage pumping station is the second load, and the pumping station in important areas should be designed according to the first load. The two-stage load pumping station generally needs two power supplies to be mutually standby or one common one standby; A first-load pumping station needs two independent power supplies. When one power supply fails, the other power supply can be independently supplied without being affected. In special cases, it is also necessary to set up its own power supply. Take a drainage pumping station as an example, set 3 10kV high voltage asynchronous motors and 2 0.4kV asynchronous motors, usually 2 0.4kV asynchronous motors can meet the requirements of drainage, in flood season, you can run 5 motors at the same time, see Figure 1.

10kV bus adopts single bus segment connection, 0.4kV bus adopts single bus or single bus segment connection. In order to reduce the impact of motor starting on the system, the motor with high power is started with a soft starter. The reactive power compensation of 10kV motor adopts the local compensation mechanism, and ensures that the compensated power factor is about 0.95; 0.4kV motor adopts centralized reactive power compensation, and the power factor after compensation is not less than 0.9.

 

FIG. 2 Configuration diagram of protection measurement and control device of pumping station

 

 

Table 1 Selection of protection measurement and control device of pumping station

 

Table 1 Selection of protection measurement and control device of pumping station

 

3.2

Automatic control, measurement, monitoring and communication of pumping stations and important auxiliary machinery systems. Its content includes: the control of the oil system supporting the main engine (such as: pump blade adjustment pressure oil system, quick gate fluid (oil) pressure operating system, oil system, gearbox cooling oil system, etc.); Control of the gas system for the main engine (low pressure gas system for vacuum failure valve (siphon pump station), medium pressure energy storage gas system for regulating the pressure oil and other pneumatic tools for the pump blade); Pumping station water system (main unit supporting cooling water system, pumping station drainage system and fire water system, etc.).

 

3.3

All kinds of non-electrical automatic measurement, monitoring, communication aspects. Its contents are as follows: the displacement, settlement, lifting pressure, stress and other monitoring of hydraulic safety; Hydrology, water level, water condition, water quantity, water quality and other monitoring; Various temperature and humidity monitoring; Insulation monitoring; The opening degree and load of each gate are monitored.

These signals are analog and switching output form, the acquisition signal is 4-20mA analog signal and switching signal, these signals are collected by the main PLC device and the corresponding alarm and control, the data can be uploaded to the pump station management platform.

In order to improve reliability, the 4-20mA or 0-5V analog signal needs to increase the signal isolation device to achieve voltage limiting, current limiting, isolation and other measures to increase the anti-interference ability of the system.

 

Table 2 Signal acquisition and isolation device selection of pumping station

 

3.4

The pumping station should be equipped with normal working lighting and emergency lighting, and meet the illumination requirements of each place, and the continuous power supply time of emergency lighting should not be less than 30min.

 

Table 3 Lighting system requirements for pumping stations

 

Ankeri provides fire emergency lighting and evacuation indication systems and intelligent lighting control system solutions for pumping stations. The normal working lighting can be controlled by induction control, timing control, remote control, etc., to meet the requirements of pump station working lighting. The emergency lighting and evacuation indication system provides no less than 90 minutes of emergency lighting, and adopts centralized power supply to ensure fire safety. Fire emergency lighting and working lighting control can be connected to the pump station management platform to achieve centralized monitoring and control.

 

 

FIG. 3 Fire emergency lighting and working lighting system of pumping station

 

 

3.5

The whole station video surveillance system and video information upload.

Pumping station management system

Pump station management platform is composed of local protection and control device, measurement and acquisition instrument, PLC automatic control device, video security, local control system and regional pump station management platform. The pumping station management platform can realize the functions of data collection, operation monitoring, control and adjustment, energy consumption analysis, accident warning, event record, operation and maintenance management of the pumping station in the region, realize unattended and centralized operation and maintenance management of the pumping station, and improve the operation reliability of the pumping station.

 

 

4.1 Pumping Station Management System (on-site deployment)

The Acrel-2000M pump station management system is deployed inside the pump station to realize the comprehensive monitoring, control and operation record of the pump station, and timely alarm signals can be issued in case of anomalies to ensure the safety of the pump station operation.

 

Panoramic view of pump gate

The pump gate panorama can help users to comprehensively monitor the overall operating status of the pump gate, such as the internal and external river level, the east-west opening of the control gate, the opening of the inner and outer gates, the operating status of the pump and the current.

 

 

Pump station overview and single line map display

Check the distribution and connection of the distribution circuit of the pumping station and the main electrical parameters. Main data include: three-phase current, three-phase voltage, power, electrical energy, power factor, circuit name.

 

Control gate monitoring

Monitor the operating state of the control gate, such as the opening of the gate, whether to lock and unlock the state, while monitoring the trend of the internal and external river level, the operation of the oil pump. In addition, the function module can realize the remote control function of control gate and oil pump, and can switch the remote/local control.

 

 

Pump operation monitoring

Monitor the running state of the pump, such as running, stopping, protection device failure and other states, to achieve remote control of the pump, drainage and water linkage control, before the remote control function will be the pump, the working gate PLC control cabinet to select the remote. When drainage and diversion are combined, the system will issue the inlet gate open command until the inlet gate is fully open.

 

 

Gate monitoring

Monitor the working door, oil pump operating status, such as running, stop and other states, in the function module can realize the remote control of the working door, oil pump.

 

 

Trend curve analysis

It can monitor the motor running load curve, internal and external water level curve, etc., to help users analyze and record the operating trend.

 

In addition, the system also has abnormal alarm, report tabulation and other functions, so that managers can know the operation of the power station in time.

 

4.2 Regional pumping station management platform

The AcrelEMS pump station management platform is set in the cloud server or regional command center to achieve unified monitoring of different types of pump stations in the region and improve management efficiency. The platform has the functions of geographical location display, 3D display of pump station, power monitoring, data query, control and adjustment, energy consumption analysis, video monitoring, alarm management, equipment management, operation and maintenance management. Data can be transmitted via 4G wireless private network or network.

 

Geographical location identification of pumping station

Pump station location can be marked on the map, click the icon on the map to directly enter the pump station monitoring interface.

 

Pump station process 3D display

Real-time display of pumping station operation status via 2.5D or 3D interface, including electrical data, pipe network, water level, gate status, etc.

 

 

Power monitoring

Real-time monitoring of pumping station power distribution system operation, including electrical parameters, off-limit/abnormal alarm, etc.

 

Pump station non-power monitoring

The platform can display the temperature of key contact points such as transformer, motor and cable of pumping station, in addition to various parameters such as motor vibration, ambient temperature and humidity, water level, gate status, video, access control, etc., and can set the alarm of exceeding the limit.

 

 

Energy consumption analysis

The power consumption data and carbon emission analysis of each pumping station were analyzed to provide data support for the energy efficiency index of the standard pump to upgrade the energy efficiency of the equipment.

 

 

Alarm analysis

The platform can classify the alarm of the pumping station in the region: ordinary, serious and accident three levels, and analyze all accidents to help managers better understand the operating status of the pumping station and avoid missing important alarm information.

 

 

Equipment archives and operation and maintenance management

The platform establishes equipment archives for pumping station equipment, records equipment manufacturers, performance parameters, maintenance information, and generates equipment two-dimensional code to support operation and maintenance management processes such as operation and maintenance inspection, defect records, work order management, accident repair, etc., to help users manage pump station operation and maintenance more efficiently.

 

 

In addition, the platform can access the lighting control system, emergency lighting and evacuation indication system data of each pumping station, and carry out unified monitoring and management through the platform to improve the operation safety and management efficiency of the pumping station.