Development And Application Of Online Power Information And Quality Monitoring And Management System

In Daqing, the electrical energy metering of a6kv-power plant applies the traditional mechanical energy meter which, with active grade2level, is of low accuracy. Operators do the daily manual meter reading, and then the data is imputed to computer statistics by the production statistics personnel. The heavy workload and the certain man-made error bring inconvenience to the calculated consumption, plant electricity rate statistics, and statistical energy analysis. The power plant’s harmonic content increase year by year. Without power quality monitoring system and real-time data, electrical technicians are unable to make quantitative analysis on the problems in the production process and thus propose timely solution.In this situation, the development of power information and online power quality monitoring and management system is highly necessary, which will not only liberate workers from massive manual meter reading and energy calculating but also provide the network browse function of electricity data information, and therefore hasten the plant’s pace of information technology.First, access to electricity data. Replace The old electric energy meters in6KV plant1,2,3,4,5and thermal network segment with7electric energy data acquisition terminals controlled by the communication prepositive machine placed in the central electrical control room. The acquisition device and electric energy meters are communicated with RS485channel, cables are laid between switch cabinets of each energy meter and are connected with DJVVP222×2×0.5shielding belt armor. An IPC is placed in the central electrical control room and connected to acquisition terminals with485communication interface. The IPC will transmit the data collected, which will be stored in the main station system. Then, the building of online power quality monitoring and management system. The mode of overall structure, the planning of electric energy quality selection, communication planning and signal acquisition mode would be decided on the basis of the requirements of whole function of the power plant. The whole system is composed of data server, WEB server, power quality data acquisition device. The system realizes the continuous measurement of the parameters of power quality, and accurate data acquisition of hardware device. And the software system has functions such as real-time data display, historical data analysis, over limit alarm, remote management of data acquisition device, user management,data integrity control, and network security control.Through the application of power quality online monitoring and management system, we will realize the all-weather online real-time monitoring for the power quality data of voltage deviation, frequency deviation, harmonics and unbalanced three-phase in power network and therefore improve the automatic management level of power system, strengthen the supervision and management of the public power grid quality and provides the reliable guarantee for the safe operation of power grid.