繼電保護及二次回路狀態(tài)評價研究
[Abstract]:With the continuous optimization of smart grid technology, relay protection plays a more and more important role in the power network. Therefore, it is very important to evaluate the state of relay protection and secondary circuit. In this paper, according to the uploaded wide-area state information, the fault correlation region is established based on the principle of distance discriminant analysis, which lays a solid foundation for the research of relay protection and secondary loop state evaluation. In this paper, the protection state is evaluated by using the protection state information and the operation data information. Based on the four basic requirements of protection, a perfect reliability evaluation index system is established, which aims at the reliability of the protection action in the fault correlation domain. Sensitivity, selectivity and agility were evaluated and suggestions for improvement were put forward. The evaluation method can be used to evaluate the protection cooperation of the upper and lower level of the protective device, the setting of the action value and the time limit of the operation, which improves the stability of the relay protection device in the current high-speed development condition of the power network. Lay a solid foundation for the safe and stable operation of power system. Considering the defects of the previous secondary loop state evaluation methods for relay protection, this paper proposes a state evaluation method based on state information fusion, which will protect the action information and start the information. The circuit breaker action information is fused together, the state evaluation model is established, the optimal solution is obtained by genetic algorithm, and the state of the secondary loop is evaluated according to the obtained optimal solution. It provides a reliable reference for discovering the hidden danger of the secondary loop in time.
【學位授予單位】:華北電力大學(北京)
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM77
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