The Research Of Intelligent Electronic Device For Monitoring Power Quality Based On IEC 61850

Along with raising concern of the power quality during power plants, power supply bureau and consumers of electricity, and the implementation of setting prices according to the quality, it is imminent to establish power quality dynamic monitor and management system, which covers the entire power grid. It also put forward higher requirements for the interoperability among power quality monitoring devices from various manufacturers. IEC 61850 is the only international standard of substation automation system based on the Common network platform, and it is gradually covering all the features of power quality monitoring. Thus, the application of IEC 61850 as communication protocol of power quality monitoring devices will be the preferred option for solving interoperability problem.Based on deep research of IEC 61850 standard connotations, this paper firstly analyzes existing problems of the existing power quality monitoring IED and key issues in the practice of power quality monitoring IED.Then a more comprehensive information model is established from information modeling and communications services modeling. Based on the C + + language, it adopts improved integrated data structure to construct information model entities. Then it analyzes the mapping relationship between core services of station bus and MMS services, the methods of giving services parameter is proposed. It uses stratified encoder/decoder library to achieve the MMS services. Finally the overall programme of software design is put forward. By analyzing the MMS communication principle and power quality monitoring IED communication processes, it completes communication module design on windows platform and uses a standard client-IED Scout to verify the interoperability of this design.In this paper, the modeling and working principle of power quality monitoring IED is carried out in-depth research. It has practical and theoretical significance for IEC 61850-based power quality monitoring device modeling. The design and implementation of the protocol layer encoder/decoder library, realizing the MMS protocol stack core functions, has great practical value.