智能变电站继电保护装置状态评估实用化研究

Research on practical state evaluation of protection device in smart substation

在新一代智能变电站的试点建设中,继电保护装置的内部参数成为可观测指标,弥补了目前继电保护状态评估工作可用数据不足和评估方法可行性差的缺陷。基于监测到的动态数据和运行及检修积累的静态数据对保护装置状态评估的实用化进行了研究。首先,对现有基于模糊综合评判法的状态评估方法进行了改进:对重要评价指标进行补充,提出更完善的评价指标体系;针对其对快速劣化指标的反应灵敏度不足,提出了"隶属度动态修正"思想。随后,针对所建立评估模型仍可能存在的不足,又补充了辅助决策规则加以完善。最后,在算例中利用该方法对某设备进行状态评估,通过对结果的分析验证了该方法的可行性。

The construction of new generation smart substations makes the internal parameters of protection devices can be observed. It makes up the defect of current state assessment that lack of available data and feasibility. The paper does the practical research on state assessment of protection devices based on the monitored dynamic data and static data accumulated by operation and maintenance. Firstly, the paper improves the existing state assessment method which is based on fuzzy comprehensive evaluation method： supplement the important evaluation index to put forward a more complete evaluation index system; put forward a dynamic correction coefficient which can modify the evaluation result indirectly to make up the insufficient of the existing method that is unable to characterize the variation trend. Then, the paper adds an auxiliary decision rules to complete the possible shortcoming of the established evaluation model. Finally, the paper evaluates a device respectively in the case and analyzes the result to verify the feasibility of the established state assessment method.