Introducing the Pepsi Asia R&D Center, using intelligent power meters to collect various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After the network is connected, it communicates through the fieldbus and travels to the background. The Acrel-2000 power monitoring system realizes the real-time monitoring and management of the power distribution circuit power distribution.
Yang Junjun 1

1 Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;

Overview

Pepsi Asia R&D Center is located in Pujiang Hi-Tech Park in Caohejing Development Zone. The R&D center is PepsiCo's largest R&D center outside of North America and one of PepsiCo's most integrated food and beverage R&D centers in the world, playing a pivotal role in PepsiCo's global R&D network.

The Pepsi Asia R&D Center covers an area of ​​about 25 acres and has a construction area of ​​nearly 20,000 square meters. It is equipped with a technology-leading cooking center and a pilot kitchen to develop foods and beverages that are suitable for Asian consumers' tastes and preferences. The center also has a test production facility that allows developers to quickly test new products and support PepsiCo to accelerate R&D innovation in China and other growing Asian markets.

This project undertakes part of its monitoring system for the substation.



1 Demand analysis

In order to ensure the statistics and analysis of the electricity load for production management and real-time monitoring of dangerous sources. Real-time online monitoring of voltage, current, power and other parameters of low-voltage distribution cabinets and power transformers at the production site is required. Once the monitoring point is abnormally monitored, the alarm can be detected in time, and the relevant personnel take necessary measures to avoid the occurrence of a safety accident. The automatic meter reading function saves manpower and material resources. The power trend curve function can intuitively display the working status and time of each loop, which is convenient for the user to find out the abnormal power circuit and timely rectify.

This technical condition applies to the substation of the Pepsi Asia R&D Center. Supplier products should be highly safe and reliable, easy to expand, and easy to maintain and maintain. The products provided by the supplier shall meet at least the technical conditions, but not limited to this, and its technical performance shall meet the requirements for data monitoring of the power distribution room.

data collection

Automatically collect analog data of all power meters in the field, and automatically collect switch data such as field switch status and fault status.

Support real-time acquisition, automatic cycle acquisition (timed acquisition) configurable cycle (1 minute to 24 hours).

Support multi-thread processing mechanism, improve data collection efficiency, and can collect data for multiple devices at the same time.

The real-time data display adopts the visual display mode of the main wiring diagram of the power distribution room, and the circuit breakers are disconnected and the fault status is visually visible.

Data analysis and processing

Comprehensive statistics and analysis of data need to achieve the following functions:

The statistics and calculations of the hours, days, months, and years of the electricity consumption data of each equipment.

Count the electricity consumption of each substation and the whole.

Data query and display

It is required to facilitate the query of the client and the query of the management personnel at all levels. The query interface can meet the requirements of managers at all levels and can support flexible conditional combination query and comparative analysis. The data of various statistical analysis can flexibly adopt various charts such as reports. Intuitive display function.

The data display function can be divided into three levels: operation layer, management layer and decision layer according to the different permissions of different users.

authority management

It is required to assign different roles to different users, and can authorize function submenus, specific file records, data records, and the like.

The system requires a reasonable and complete user security control mechanism to effectively protect the information resources in the application environment and prevent information loss, theft and destruction.

parameter settings

The transformer transformer ratio can be set through the collection cabinet, and various current and voltage protection settings can be set.

Fault judgment and alarm have automatic fault diagnosis and use sound and light mode alarm function. The types of alarms include switch faults, voltage and current overruns, communication faults in the field acquisition module, and communication faults with the monitoring system. The alarm time is automatically recorded in the system database, which is convenient for users to inquire. The staff can grasp the real-time running status of the variable power station at any time, find the fault of the power distribution and operate accordingly, improve the management efficiency of the power distribution and improve the safety of the power system. reliability.



2 system plan

Acrylic Acrel-2000 system According to the actual situation of Pepsi Asia R&D Center, the overall network structure is directly connected to the data collector of the power distribution station by shielded twisted pair cable and then directly connected to the monitoring host of the opening and closing station to ensure the power distribution station. The stability and real-time performance of power monitoring system transmission. As shown in the figure below: station management layer, network communication layer and field device layer.



The site has a total of 9 ACR330EL/H, 61 ACR220EL, and 4 M5 integrated protection devices. It is divided into 5 RS485 buses and connected to the data collector of the power distribution station. The data collector is directly connected through the super five network cable. Monitoring host to the duty room.

1) Station management

The management of the station control management system for the power monitoring system is a direct window for human-computer interaction. In the Pepsi Asia R&D Center project, it mainly refers to the monitoring host placed in the power distribution station.

2) Network communication layer

The communication layer is mainly composed of a Nport5610-8, an Ethernet device and a bus network. The main function of the Nport5610-8 data collector is to monitor the on-site intelligent instrument; the main function of the Ethernet device and the bus network is to realize the data interaction between the substation and the main station, so that the distribution system management is centralized, informationized and intelligent. Greatly improve the safety, reliability and stability of the power distribution system, and truly achieve the goal of unattended.

3) Field device layer

The field device layer is a data acquisition terminal, which is mainly composed of smart meters. The smart meter is connected to the communication server through the shielded twisted pair RS485 interface, and uses the MODBUS communication protocol bus type connection to reach the communication host through the communication server. Implement remote control.

Smart meter field connection

The field instruments are connected by hand-tightly through the shielded twisted pair (RVSP2*1.0). The number of smart meters connected to each bus is about 20, and different types of smart devices are connected to different buses, and then the data is uploaded to the data. The collector Nport5610-8, and then upload the data to the local monitoring terminal. The specific connection diagram is as follows:



The ACR multi-function liquid crystal display instrument is used in the incoming and outgoing loops. It is a network power meter designed for power monitoring needs of power systems, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as three-phase voltage and current. Active power, reactive power, power factor, frequency, active power, reactive power.



3 system function

The real-time monitoring system diagram of the power distribution station is the main monitoring screen, which mainly monitors the running status of all circuits in the power distribution station in real time. In the system diagram, you can visually see the operating parameters and status of each incoming and outgoing line. You can see all the conventional power parameters on the outgoing side of the transformer, such as: three-phase voltage, current, active power, reactive power, and power factor. , frequency, active power, etc. As shown below:



Power distribution system



Loop detailed electrical parameters

The event alarm recording function mainly completes the alarm information event record and the occurrence time of the alarm time period, provides the basis for the on-duty personnel and analyzes the cause of the accident, as shown in the following figure:



Alarm function real-time query

The harmonic monitoring function mainly monitors the power quality and power reliability of the entire distribution system. For example, the maintenance personnel of the power distribution system can grasp the harmonic content of the power distribution system through the harmonic analysis interface, and take corresponding measures to improve the reliability of the power distribution system and reduce the occurrence of power supply accidents caused by harmonics. The three-phase voltage, the percentage of the 2-31 harmonic content of the three-phase current, and the percentage of the total harmonic content can be displayed in a list mode and a histogram manner.



Harmonic monitoring

The parameter meter reading function mainly queries the electric parameters of the low-voltage outlet circuits. 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 circuits of the transformer inlet and outlet lines of the Pepsi Asia R&D Center, including: three-phase current, active power and active power. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown below



Electrical parameter reading

The power consumption report function can select the time period for query, support the electricity cumulative query for any time period, and have the functions of data export and report printing. Provide accurate and reliable energy reports for duty personnel. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown in the figure below, the accurate power consumption of the power distribution circuit is displayed. Users can directly print the report and save it to other locations in EXCEL format. As shown below:



Energy report

The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Green indicates normal communication and red indicates communication failure. The figure below shows the communication status of the power distribution station.



Communication structure diagram

The load trend curve interface can be used to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item on the screen to complete the corresponding function switching; help users to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the health of the entire system. As shown below:



Trend graph



4 Conclusion

In today's distribution facilities, the distribution security of the public office building project is crucial. The application of the Acrel-2000 power management system in the Pepsi Asia R&D Center can realize the distribution circuit for the power distribution. The real-time monitoring of electricity can not only display the power consumption of the loop, but also have the network communication function, and can form a power management system with the communication management machine and the computer. The system realizes the analysis and processing of the collected data, and displays the running status of each distribution circuit in the power distribution station in real time. It has pop-up alarm dialog box, voice prompt, SMS alarm light, and generates various energy reports for the closing and closing of the load. Analyze curves, graphs, etc., to facilitate remote meter reading and analysis and research of electric energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for solving large-scale public construction problems.



references:

[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Power Electrical Measurement Digital Instrumentation [M]. Beijing. China Electric Power Press. 2007. 4

[2]. Zhou Zhongbian. Smart grid customer power monitoring and power management system product selection and solution [M]. Beijing. Mechanical Industry Press. 2011.10




About the Author:

Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ




Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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