Design And Research On Feeder Terminal System In Smart Grid

Over the years, due to the low level of distribution automation in China’s electric power system, it results in such situation as tight electricity supply, high loss of residential and agricultural electricity wire, high electricity tariffs, low voltage, unreliable power supply.In order to achieve the feeder automation in distribution network, and to meet the need of Smart Grid, and to fundamentally sovle the above problems, this paper proposes a new feeder terminal automation system, so that such functions as "Remote Adjustment, Remote Metering, Remote Signaling, Remote Control" in feeder terminal can be achieved. For the distribution network to complete the above functions, the paper makes a careful study of the following aspects.First, it describes the purpose, significance and some concepts of this design; and to the current situation of the distribution automation as well as the development of feeder automation, an improved feeder automation terminal system is proposed.Secondly, the paper inquires the details on the distribution network troubleshooting mode, and selected feeder protection mode based recloser master monitor, which is more suitable for our current distribution network. On this basis, a fault location algorithm based on matrix operations is chosen.Then, feeder automation terminal system is designed integrately. From the selection of the switch body at one side, to FTU that is the core of the secondary equipment, the paper studies the column switch, the transformer connection, each of the signal interfaces and so on; focused on the main function of the FTU, the overall design is proposed. Seeing Blackfin member products ADSP-BF531as the main chip, the paper makes the design of the functional circuit (storage expansion circuit, analog input circuit, frequency measurement circuit, etc.).Finally, the research on the algorithm of the feeder automation system is launched, including the protection tuning methods, digital signal processing algorithm as well as some functional software design; on this basis, the debugging and emulation of the hardware functional circuitry are unfolded, which can illustrate the feasibility of the designed system.