Application of Power Monitoring System in Distribution Reform of Wuhan Aiji Auto Parts Co., Ltd.

The company's main business scope is: design, development, processing of automotive key components and automotive, motorcycle molds, inspection tools and fixtures; sales of the company's products, and provide technical advice and technical services.

This project is a transformation project of Wuhan Aiji Auto Parts Co., Ltd. According to the requirements of power distribution system management, it is necessary to carry out power monitoring on 8 low-voltage distribution lines in 3 substations of Wuhan Aiji Auto Parts Co., Ltd. to ensure safe, reliable and efficient operation of the power circuit.

The Acrel-2000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and performs distributed data collection and centralized monitoring and management of the variable power distribution system. The secondary equipment of the power distribution system is networked, and the field devices of the distributed power distribution stations are connected as an organic whole through the computer and the communication network to realize remote monitoring and centralized management of the power grid operation.

1 System structure description This monitoring system mainly realizes the power monitoring and power management of 8 inlet cabinet distribution systems in 3 power distribution rooms of Wuhan Aiji Auto Parts Co., Ltd.; the monitoring scope is T1, T2 of the transformation substation. T3, T4, T5, D1, D2 and D3 A total of 8 transformers of the incoming line side of the instrument for remote real-time monitoring and power management. The system has a total of 8 instruments, divided into 2 buses, which are directly connected to the duty server through the shielded twisted pair pipeline to connect to the serial server to realize the data connection between the instrument on the bus and the monitoring host.

The power monitoring system uses a relatively simple and easy-to-understand picture display; as shown in the following figure:

2 Main functions of power monitoring system 2.1 Data acquisition and processing Data acquisition is the basis of power distribution monitoring. Data acquisition is mainly completed by the underlying multi-function network instrument, 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, electrical EPI, harmonics, and remote device operating status.

The data processing mainly displays the electric parameters collected as required in real time to the user, and achieves the automation and intelligent requirements of the power distribution monitoring, and simultaneously stores the collected data into the database for the user to inquire.

2.2 Human-computer interaction system provides a simple, easy-to-use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low-voltage power distribution system, showing the status of the power distribution system equipment and the corresponding real-time operation parameters; real-time dynamic refresh of the screen; analog quantity display; switch quantity display; continuous record display.

2.3 The diachronic event duration event viewing interface is mainly for the user to view the fault records, signal records, operation records, and over-limit records that have been made to provide convenient and friendly human-computer interaction. Through the historical event viewing platform, you can customize the requirements according to your own requirements and query conditions. It is convenient to locate the historical events you want to view, and provide good software support for your operation of the entire system.

2.4 Database establishment and query mainly complete remote measurement and remote signal collection, and establish a database to generate reports for users to query and print.

2.5 User Rights Management For different levels of users, set different permission groups to prevent loss of production and life due to human error, and to achieve safe and reliable operation of the power distribution system. Users can log in, log out, change passwords, add deletes, etc. through user management, which is convenient for users to modify accounts and permissions.

2.6 Operation load curve The load trend curve function is mainly responsible for timing the incoming line and important loop current and power load parameters, and automatically generating the running load trend curve, so that users can know the running load status of the equipment in time. Click the corresponding button or menu item to complete the corresponding function switching; 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 users enter the line trend analysis and fault recall. Analysis of the health of the entire system 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 filter the data processed in the system to generate the report data required by the user. The program can also use the timed save, print or summon save and print mode for the report file according to the user's needs. At the same time, the program also provides users with the function of generating report file management.

The report has the function of freely setting the query time to realize the energy statistics, data export and report printing of day, month and year.

3 Case Analysis 3.1 The customer requested that the three power distribution rooms of Wuhan Aiji Auto Parts Co., Ltd. have 8 power distribution systems for power monitoring and power management; the monitoring scope is T1, T2, T3 and T4 for transforming substations. , T5, D1, D2 and D3 A total of 8 transformers of the incoming line side of the instrument for remote real-time monitoring and power management. Customer-supplied power distribution room power monitoring requirements table:

Customer requirements for the report: report the current, voltage, power, power factor, 2-31 harmonic components of each circuit, generator room and power distribution room temperature humidity, and support the query of historical data printing.

3.2 Software realization function for this project In this transformation project, there are 8 Ankerui ACR series harmonic instruments, which are network power meters designed for power monitoring needs of power systems, industrial and mining enterprises, public facilities and intelligent buildings. Measure all conventional power parameters, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power, harmonics and other electrical parameters. This 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.

1# The main transformer is shown in the figure (2). The function has electric power telemetry. It mainly monitors the electrical parameters of the running equipment, including: line three-phase voltage, current, power, power factor, electric energy, frequency and other electrical parameters and the distribution loop. Three-phase current; the remote signal function realizes the operation status of the field device, which mainly includes: the switch's branching and closing operation status and communication fault alarm.

The parameter meter reading function mainly completes the inquiry of the electrical parameters of the low-voltage outlet circuits. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of the low voltage circuits of the two transformer outlets of the substation, 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 in Figure (3).

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. See Figure (4).

The harmonic curve function mainly completes the harmonic component statistics of the low-voltage outlet circuit, and provides an intuitive, accurate and reliable grid quality report for the duty personnel. The curve has functions such as data export, historical data query and report printing. See picture (5).

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. Red indicates normal communication and green indicates communication failure. See Figure (6).

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. See Figure (7).

4 Conclusion With the development of society and the wide application of electric power, the power monitoring system has become an inevitable choice for users of large-scale multi-substance projects such as key projects, landmark buildings/large public facilities throughout the country. The Acrel-2000 power introduced in this paper The application of the monitoring system in the transformation of three substations in Wuhan Aiji Auto Parts Co., Ltd. can realize real-time monitoring and power management of the power supply of the low-voltage distribution circuit of the substation, not only showing the power consumption of the circuit, but also having network communication. Function, can be combined with serial server, computer, etc. to form a power monitoring system. The system realizes the analysis and processing of the collected data, and displays the running status of each distribution circuit in the substation in real time. It has a pop-up alarm dialog box and an alarm sound prompt for the analog switch-on and load limit, and generates various energy reports and analysis. Curves, graphics, etc., facilitate remote meter reading and analysis and research of electrical energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for the users of the substation to solve the problem of electricity consumption, and has achieved good social benefits.