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Research And Design Of Feeder Terminal In Smart Grid

Posted on:2017-05-06Degree:MasterType:Thesis
Country:ChinaCandidate:X XiaoFull Text:PDF
GTID:2272330485969621Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
With the development of smart grid, distributed power supply and other new energy operate in a grid-connected way, therefore, more and more powerful power distribution equipments are required in distribution automation system. However, the traditional distribution terminal lacks of scalability and intelligent function, it is difficult to meet the needs of smart grid. Feeder automation, as the key component of power distribution automation, is mainly responsible for monitoring, coordinating and controlling the operation status of distribution network, uploading the collected data and information to the main power stations, and switching on/off operation of power distribution equipment. Its performance and function have a direct impact on the power supply capacity and reliability of the whole distribution network. Therefore, it is necessary to design a FTU with stable performance and powerful and high intelligent level to improve the level of distribution network automation system, which plays an important role on the construction of smart grid.This paper first describes the background, significance and some concepts of smart grid, and the development of domestic distribution network, and overview the current development situation of feeder automation technology. According to the development status of 10KV distribution network in China, a new mode of feeder automation terminal system based on the combination of centralized control and local control is proposed. Then, according to the status of China’s smart grid and the characteristics of distribution network communication requirements, this paper analyzed the protection mode, communication mode and communication protocol of feeder automation, and select an appropriate implementation adaptable to the current stage of the feeder automation in China.Then, as is described in this paper that advanced DSP technology to design the FTU hardware circuit, including dual power supply switching circuit, RS232 interface circuit, CAN bus interface circuit, GPRS interface circuit, Ethernet communication circuit, simulation input circuit, I/V conversion circuit, switch input/output circuit etc. is utilized. This paper also reveals an analysis of the A/D sampling algorithm, FIR algorithm, FFT algorithm and a new fault location algorithm that adapt to distributed power supply, and designed the software flow. In addition, the FIR filtering algorithm and FFT algorithm are simulated by Matlab software. These results can meet the requirements of FTU data processing.Finally, a test platform is built, which uses equipment management software to test the FTU device. Which including AC sampling program debugging and simulation, and have a real-time monitoring on telemetry, remote signaling and remote control that worked on normal condition, and the fault location test. The FTU monitoring and information display are achieved through the terminal device and equipment management software, which further illustrate the feasibility of the designed system.
Keywords/Search Tags:Smart Grid, Distribution Automation System, Feeder Terminal Unit FTU, Fault Location
PDF Full Text Request
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