Design On The Intelligent Automatic Switch-in Protection Device Of Standby Power Supply For Rural Power Grid

With the rapid development of China’s power industry, electric energy plays a more and more important role in all aspects of society. Electricity customers have a higher requirement on power quality, safety, reliability and continuity, which requires the power industry can take more effective, more reasonable measures to manage electric energy production, transportation, distribution and consumption intelligently. Therefore, the concept of smart grid is proposed. For some important electricity load, even short time interruption may cause enormous losses. It’s very necessary to install automatic switch-in protection device of standby power supply in integrated substation automation system. The rural power grid is also being constructed and designed more intelligently at a rapid speed. In order to adapt to the development of smart grid, research on intelligent automatic switch-in protection device of standby power supply is also of great significance.Based on consulting a large number of relevant literature at home and board and understanding the research background and current situation, this thesis analyzes the advantages and disadvantages of several typical automatic switch-in protection device of standby power supply. Combined with the principle of automatic switch-in protection device of standby power supply and functional requirements of smart grid, a set of automatic switch-in protection device of standby power supply based on TMS320F2812DSP for smart rural grid is designed. The modular design method is adopted both in hardware and software. In addition to the completion of basic back-up power auto-switching, the device also intergrates several protection function, including adaptive over current protection, overload intertripping protection and bus bar charging protection. The communication part design of automatic switch-in protection device of standby power supply adopts Ethernet communication module and wireless communication technology, which can better meets the needs of future development of smart grid. The thesis elaborates the design principle, key techniques and implementation methods of automatic switch-in protection device of standby power supply both in hardware and software modules. At last, it completed automatic switch-in protection device of standby power supply function test, including alternating current sampling precision adjustment, standby power supply auto-switching, current protection and fault alarm function and so on.In the existing test lab condition, a series of research and experiment is conducted. The results show that the intelligent automatic standby power supply switch-in protection device has very high sampling accuracy, and it can realize standby power supply auto-switching function, the three sections of adaptive current protection function, fault alarm function, Ethernet communication and wireless communication, which achieves the design goal. Figures(31), tables(11), references(65).