Design and Application of Energy Management Monitoring System for the Fourth Wastewater Treatment Plant in Cangzhou

0 Overview

This project is the fourth Yuzhou sewage treatment plant power management system. According to the requirements of power distribution system management, power monitoring and power management of the power distribution room of the fourth sewage treatment plant in Cangzhou is required to ensure the safety, reliability, and efficiency of power usage.

Acrel-3000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and field bus technology, and performs distributed data collection and centralized monitoring and management of the power distribution system. The secondary equipment of the distribution system is networked. Through the computer and the communication network, the field devices of the decentralized power distribution station are connected into an organic whole, and the remote monitoring and centralized management of the power grid operation is realized.

1 System Structure Description

The monitoring system mainly realizes electricity monitoring and power management in the power distribution room of the Fourth Sewage Treatment Plant in Cangzhou; the monitoring range is the meters distributed in the power distribution room, and remote real-time monitoring and power management of these multi-functional meters. The system has a total of 86 instruments (all PZ72L-E4/C). It is divided into four buses and is connected to the CP134U-I. Finally, it is connected to the monitoring host through the shielded line and connected to the monitoring host to realize the data connectivity between the instrument on the bus and the monitoring host. .

The monitoring system adopts a hierarchical distributed structure, ie station control layer, communication layer and bay layer; as shown in Figure (1):

Figure (1) Network topology

Interval equipment layer is mainly: multi-function network power meter, switch and intelligent circuit breakers. These devices are corresponding to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the on-site MODBUS bus network communication, data acquisition on the spot.

The main network communication layer is: a communication server. The main function of the communication server is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange between the field layer and the station control layer.

Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the field equipment and display it to the user in the form of human-computer interaction.

The above network instruments all adopt RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission. Generally, two wires are used to connect the wires. The connection is simple and convenient. The communication interface is half-duplex communication, that is, both parties can receive and send data. Only data can be sent or received at the same time. The maximum data transmission rate is 10Mbps.

The RS485 interface is a combination of balanced drivers and differential receivers. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus. The maximum transmission distance is 1.2 km.

2 main functions of the power management system

2.1 Data Acquisition and Processing

Data acquisition is the basis of power distribution monitoring. Data collection is mainly accomplished by the underlying multi-function network instrumentation, realizing local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, power Epi, and remote device operating status.

The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query.

2.2 Human-computer interaction

The system provides simple, easy to use, and good user interface. Using the Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low voltage distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters, the screen timing switching tour; dynamic refresh of the screen real-time; analog display; switch display; continuous Record display and so on.

2.3 Historical events

The duration event viewing interface provides users with easy and friendly human-computer interaction by viewing the fault records, signal records, operation records, and over-limit recordings that have occurred. You can view the platform through historical events. You can easily locate the fault according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.

2.4 Database Establishment and Query

It mainly completes the remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.

2.5 User Rights Management

For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate user modification of accounts and permissions.

2.6 Running load curve

The load trend curve function is mainly responsible for regularly collecting incoming lines and important loop current and power load parameters, and automatically generating running load trend curves to facilitate users to know the operating load status of the equipment in a timely manner. Click the corresponding button or menu item of the screen to complete the switching of the corresponding function; you can view the real-time trend curve or historical trend line; you can perform translation, zoom, range conversion and other operations on the selected curve to help the user to enter the trend analysis and fault recall. Analyzing the entire system's operating status provides intuitive and convenient software support.

2.7 Remote Report Query

The main function of the report management program is to design the report style according to the needs of the user, and the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files.

The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing.

3 Case Studies

The Ganzhou No. 4 Wastewater Treatment Plant's power management system performs power monitoring and power management for the power distribution cabinets in the power distribution room.

The power circuit adopts PZ72L-E4/KC multifunctional power meter, which is a network power meter designed for the power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as: Phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power and other electrical parameters. And this instrument has 4 photoelectric isolation digital input contacts and 2 relay control output contacts. These contacts can be used with intelligent circuit breakers to achieve remote signaling and remote operation of the circuit breaker. The series of network power meters are mainly used in substation automation, distribution network automation, residential power monitoring, industrial automation, energy management systems and intelligent buildings.

The secondary diagram of low-voltage power distribution is shown in figure (2). The main function of the power telemetry is to monitor the electrical parameters of the operating equipment, including: three-phase voltage, current, power, power factor, electrical energy, frequency and other electrical parameters and distribution loops. Three-phase current; remote signal function to display the operating status of field devices, mainly including: switching of the switch, closing operation status and communication failure alarm; when the circuit breaker is dislocated, it will send an alarm signal to remind the user to deal with the fault in time.

Figure (2) Secondary diagram of low voltage distribution

Trend curve function: This function can query the running trend of three-phase current I and active power P on a monitoring circuit one day and draw four trend curves. The vertical axis of the trend curve represents the value of the parameter, and lists the maximum value and the rated value within the query range; the horizontal axis of the curve represents the time, when clicking on the view by day, the display data is an hour for each cell, and when the click is on the hour The data bits are displayed for one minute per cell when viewed. The query supports the left and right shift function buttons. The left and right shifting period by day is 1 day, and the left and right shifting period by hour is 1 hour within the query day. (Figure 3)

Figure (3) Trend Curve

The parameter reading function mainly inquires into the electrical parameters of the low-voltage outlet circuit. Supports electrical parameter query at any time, with functions such as data export and report printing. This report queries the electrical parameters of the low-voltage loops for 86 outlets of substations, which mainly include: three-phase current, active power, active power, and transformer temperature. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. See Figure (4).

Figure (4) Parameter reading

The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. Users can print the report directly and save it in EXCEL format to other locations. See Figure (5).

Figure (5) Energy Report

4 Conclusion

With the development of society and the wide application of electricity, the power system has become an inevitable choice for large-scale multi-substation users, such as key construction projects and landmark buildings/large-scale public facilities throughout the country. The Acrel-3000 energy management system introduced in this paper is The application of the Ganzhou No. 4 WWTP can realize real-time monitoring and power management of the high- and low-voltage power distribution circuits of substations. It can not only show the power status of the loop, but also has network communication functions, and can be combined with computers to form power management. system. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and voice prompts for the closing and closing of the load, and generates various energy reports and analysis curves. Graphics, etc., to facilitate remote meter reading and analysis, research. The system is safe, reliable and stable. It provides real and reliable basis for users of substations to solve electricity problems and has achieved good social benefits. [2]

references:

[1]. Ren Cheng, Zhou Zhongzhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4

[2].Zhou Zhouzhong, et al. Product Selection and Solution for Smart Grid User-end Power Monitoring and Power Management System[M]. Beijing. Machinery Industry Press. 2011.10

About the Author:

Zhang Qiaoyu, female, undergraduate, Ankerui Electric Co., Ltd., engineer,

Technical communication: 021-69155257 QQ;2880263327 Email@qq.com

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