Research And Realization Of Electric Power Measurement Managing System For Power Plants

At present, the widely-used three-phase electron multifunction energy meter has the function of measuring direct and indirect active component, direct and indirect reactive component, maximum demand, and power factor. It can collect various electric data via RS485 and export interface of long-distance reading meter impulse as well as process kinds of information and manage electric volume. The electric volume data it provides is of high precision.RS485 serial communication is very convenient to use because it can avoid disturbance from yawp signal. RS485 standard serial communication port is taken as communication port for meter in DL/T645-1997 communication protocol which defines physical data link network layer in detail. In this thesis, various electric data collection for three-phase electron multifunction energy meter is realized via RS485 bus according to DL/T645-1997 communication protocol. The collected data will be saved to SQL SERVER and the system can process various data.Starting from the analysis of Electric Power Measurement System, and according to the further requirements power plants making to the concrete administration and application after their marketing operation, this article researches and realizes the Electric Power Measurement System software for power plants. The basic principles for the design and realization of Electric Power Measurement managing System are experimented in a system in reality.This system includes three parts: The subsidiary system for data collection, the subsystem for equipment administration, and the subsystem for data disposal and query. The subsidiary system for data collection and process makes use of the RS-485 or RS-232 digital signal output on intellectual electric energy meters, and puts the parallel 485 output of the electric energy meters to a computer with 485 module via communication cable. The computer is responsible for receiving the data collected by each electric energy data collection module and saving them to SQL Sever. The subsystem for equipment administration mainly charges equipment administration: meter parameter administration, changing meter administration et al. The subsystem for data disposal and query mainly charges data statistic, data analysis, inquiry, displaying and printing report forms et al.The whole system uses third class truss or multi-hierarchy system designing technology which has such advantages: 1. Convenient to install client procedure. 2. Efficient. 3. Safer. 4. More commonly-used because of stability. The client software is designed with multi-thread technology. Multi-thread technology can strengthen capability of procedure from these aspects: 1. Avoid bottle neck phenomenon.2. Parallel operation. 3. Multi managing.The system can collect data from electric energy meters accurately and efficiently, as well as monitor the system parameters, analyze energy measure, skim through the data, print report forms, give an alarm when there is an abnormal phenomenon et al.