继电保护及二次回路状态评价研究

发布时间：2018-11-03 18:32

【摘要】：随着智能电网技术的不断优化,继电保护在电网中有了越来越重要的地位,因而,针对继电保护及二次回路的状态评价显得尤为重要。本文首先跟据上传广域状态信息,利用距离判别分析原理针对线路运行情况,建立故障关联域,为后文继电保护以及二次回路状态评价研究打下坚实基础。本文利用保护状态信息与运行数据信息对保护状态进行评价,主要是以保护四个基本要求为出发点,建立完善的可靠性评价指标体系,在故障关联域内针对保护动作的可靠性、灵敏性、选择性、速动性作出评价,并提出了相应的改进建议。该评价方法能够针对保护装置上下级的保护配合、动作值整定以及动作时限作出评价,提高了继电保护装置在现今电网高速发展条件运行的稳定性,为电力系统安全稳定运行打下坚实基础。考虑到以往针对继电保护二次回路状态评价方法的缺陷,本文提出了一种基于状态信息融合的二次回路状态评价方法,将保护动作信息、启动信息、断路器动作信息融合在一起,建立状态评价模型,利用遗传算法求取最优解,并针对求得的最优解对二次回路进行状态评价,为及时发现二次回路存在的安全隐患提供可靠参考。
[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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM77

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