Research On Multi-source Data Fusion Technology Of Distribution Network With D-PMU Measurement

With the construction of smart grids,large-scale access of flexible loads such as distributed generation and electric vehicles and frequent interaction between users and power grid,the difficulty of data monitoring and decision-making control in distribution network is increasing.More and more measurement terminals or systems are arranged in distribution networks,such as distribution network micro-synchronous phasor measurement devices(D-PMU),advanced measurement systems(AMI),and traditional equipment.The distribution network SCADA system together constitutes a new distribution network hybrid measurement and control system.At the same time,due to the wide access of distributed new energy sources and electric vehicles in the distribution network,data such as photovoltaic,meteorological stations have become very important.In the era of big data development,the basic goal of intelligent power distribution is to achieve comprehensive collection,smooth transmission and efficient processing of information,however,the data format of distribution network is different at present,which makes it difficult for distribution network to share data information.Therefore,it is very important to study the fusion of D-PMU and original data in distribution network.In view of the above problems,in order to realize the integration and utilization of multi-source information in distribution network,the main research contents of this paper are as follows:This paper summarizes the necessity current situation o f power grid data fusion,Compared with data models such as SCADA,distributed power generation,account,marketing,the research on D-PMU data model of new devices in distribution network is almost blank.D-PMU device is introduced in this paper.The difference between D-PMU and PMU in distribution network is analyzed through the comparison of structure,synchronous timing and communication.It shows that the data model of PMU in main network is not suitable for D-PMU in distribution network.This paper analyzed the data format of high frequency D-PMU,which shows the difference with other data of distribution network.Based on IEC 61968/61970 series international standards,through the differentiation analysis of D-PMU,the CIM data model of D-PMU is established using UML,and classes and attributes are added.At the same time,the photovoltaic,SCADA data and account data are extended on the original CIM model to complete the unified expression of data.On the basis of unified modeling,the data models are transformed into extensible markup language(XML)documents for data-level interaction.Besides,the document object model is used to parse and extract the data information contained in the XML document..Then,in order to realize the integration of multi-source data information in distribution network with account data as the center of association,taking account data as the center of association,the modeled data is processed into database.In order to solve the problem of large amount of D-PMU data,the relational database SQL Server is used to store persistent data and the memory database Fast DB is used to store current application data,which speeds up the data processing and realizes the association of multi-source data at the database level.Finally,relying on Guangzhou Nansha Free Trade Zone,WCF is used to realize the communication between client and server on the information integration platform of distribution network.The correctness of database interface and data storage form are tested through data access interface of server.The effect of data fusion in distribution network is demonstrated through client interface.