Research On Novel Real-time GOOSE Communication Network Oriented Smart Substation

The GOOSE(Generic Object Oriented Substation Event) network in SmartSubstation is used to transmit critical information, including opening or closingpackets. For the reason that GOOSE network is one of the key communicationnetworks which ensuring the safety and stable operation of Smart Substation, theimproving of its reliability and real-time is significant for the Smart Substationconstruction.The existed GOOSE network is based on traditional Switched Ethernettechnology, which means that the swtiches are the core of the network. As a result,the reliability and real-time performance of GOOSE network is limited by thenumber and capability of the switches. This paper proposes to replace the traditionalSwitched Ethernet with EtherCAT(Ethernet Control Automation Technology). Onthis basis, the GOOSE network will be re-networked. Then, the paper will researchon the reliability and real-time of the novel GOOSE network.Firstly, the paper had an overview of the communication system and structurein Smart Substation. Also, the role and function of the GOOSE network wasdiscussed. Based on the analysis of the structure and technical characteristics inGOOSE network, the requirements of it were specificed. Furthermore, the existingbottlenecks and risks of the GOOSE network were analyzed. On the other hand, thepaper introduced the principles and real-time advantages of EtherCAT. Taking atypical220kV GOOSE network in Smart Substation for example, the paperdescribed the networking process of the novel GOOSE network based on EtherCAT,which laid the foundation for further theoretical and experimental research.Secondly, the paper used the spanning tree-based network reliability analysismethod to research the reliability of traditional GOOSE network based on theSwitched Ethernet and novel GOOSE network based on the EtherCAT respectively.In the process, MATLAB software was applied to the calculation and simulation.The results showed that EtherCAT can improve the reliability of the GOOSEnetwork under the same network conditions.Thirdly, the real-time requirements of GOOSE network definited by IEC61850standard was specificed in the paper. On the basis of these requirements, the networkdata transmission delay in the traditional GOOSE network and the novel GOOSEnetwork was computed and analyzed respectively. The calculation results impliedthe networking limitations of the traditional GOOSE network and the real-timeadvantages of the novel GOOSE network. Using OPNET simulation software, the paper namely simulated the traditional GOOSE network under normal operationsituation and broadcast storm situation. The simulation results showed that thetraditional GOOSE in broadcast storm situation was unable to meet the real-timerequirements of IEC61850standard.Finally, an experimental platform was designed for the novel GOOSE networkwith DSP28335development board and EtherCAT toolkits. The platform was usedto test and analyze the key real-time parameters of the novel GOOSE network. Thetest results showed that after the EtherCAT was applied in, the real-time of theGOOSE network can be improved and the real-time requirements of IEC61850willbe meet at the same time,.