CAN bus based electric energy quality real-time monitoring and evaluation system

Abstract

The invention discloses a real-time monitoring and estimating system of power quality based on CAN bus for electric system and each class of power distribution system, which comprises the following network structures: data gathering layer as the first layer, which groups multiple stations to manage and transmits all the electric power network signal into standard voltage to the data gathering card; data disposing layer as the second layer, which converses the electric parameter by data gathering layer to realize the calculation and analysis of electric quality such as voltage fluctuation, harmonic analysis, flicker and so on; data transmitting layer as the third layer, which utilizes CAN bus to establish high-reliability opened data communicating circuit and realizes the conversion of order and data between middle control chamber PC set and working control machine; user layer as the fourth layer, which builds friend operational interface to provide display, storage, analysis and estimation function of the monitored data and makes the user to observe real-time data of wind electric-field operation directly.

Description

technical field [0001] The invention relates to a real-time monitoring and evaluation technology of electric energy quality, which is mainly applicable to the real-time monitoring and evaluation of electric energy quality of power systems and power distribution systems at all levels. Background technique [0002] At present, the existing power quality monitoring system products can be roughly divided into three categories: offline portable instruments, stand-alone industrial computer mode and master-slave mode based on RS232 / 485 simple network communication. [0003] Offline portable instruments can only perform limited data acquisition and recording functions with human participation, and cannot provide rich and satisfying storage and historical data analysis functions. [0004] The stand-alone industrial computer method has little consideration in the 3-phase real-time acquisition and analysis, the working method is unreliable, and the collected and analyzed data cannot be...

AI Technical Summary

Problems solved by technology

[0003] Offline portable instruments can only perform limited data acquisition and recording functions with human participation, and cannot provide rich and satisfying storage and historical data analysis functions

[0004] The stand-alone industrial computer method has little consideration in the 3-phase real-time acquisition and analysis, the working method is unreliable, and the collected and analyzed data cannot be transmitted to the control center for analysis and storage, so as to facilitate future data comparison analysis and data mining

[0005] The master-slave method based on RS232 / 485 simple network communication has many shortcomings: there can only be one master node on a network, and it is impossible to form a multi-master or redundant system. Once the master node fails, the entire system will be paralyzed; The data transmission efficiency is low and the flexibility is poor, which is the fatal weakness in the occasions with high real-time requirements; the RS485 specification is adopted in the physical layer, and the SDLC protocol is used in the link layer, the overall efficiency is low, especially the error handling ability is not good powerful

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