电网节点电压暂降综合评估及其检验方法

Comprehensive evaluation of grid node voltage sag and its testing method

准确评估电压暂降是改善和解决暂降问题的基础,而对评估方法的检验是评估质量的保障。针对现有暂降指标体系缺乏综合评估方法且评估结果无法定量检验的问题,文章基于IEEE Std 1564-2014指标体系标准,提出了一套电网节点电压暂降综合评估流程及其检验方法。针对目前暂降评估仅对暂降频次或幅值进行评估从而造成信息缺失的问题,文章从暂降频次、幅值、能量和严重程度等方面建立暂降综合评估数学模型;提出以指标预处理、指标赋权和评估结果检验为关键环节的电压暂降综合评估一般流程;文章提出了综合评估流程的检验方法,从辨识性、一致性、稳定性和有效性四个角度出发,对综合评估方法的各环节进行定量评价。综合评估结果能反映电网中暂降严重的节点或区域,检验方法能衡量不同评估方法的优劣,从而为暂降的分析与治理提供科学依据。基于蒙特卡洛方法,对IEEE 30节点系统进行仿真,验证了文章方法的合理性和准确性。

Accurate evaluation of voltage sag is the basis for improving and resolving sag problems,and testing of evaluation methods is a guarantee of evolution quality.Aiming at the problem that the existing sag index system lacks comprehensive evaluation method and the evaluation result cannot be quantitatively tested,this paper proposes a set of grid node voltage sag comprehensive evaluation process and its testing method based on IEEE Std 1564-2014 index system standard.Firstly,in view of the current sag evaluation,only the sag frequency or amplitude is evaluated to cause the lack of information,this paper establishes a mathematical model of sag comprehensive evaluation from the aspects of sag frequency,amplitude,energy and severity.Secondly,this paper proposes a general process for comprehensive evaluation of voltage sag with key links such as index preprocessing,index weighting and results testing.Finally,this paper proposes a comprehensive evaluation process testing method,from the perspectives of identification,consistency,stability and effectiveness,quantitatively testing of the comprehensive evaluation.The comprehensive evaluation results can reflect the nodes or regions with severe sag in the power grid.The testing method can measure the advantages and disadvantages of different evaluation methods,thus providing a scientific basis for the analysis and treatment of sag.Based on the Monte Carlo method,the IEEE 30-node system is simulated to verify the rationality and accuracy of the proposed method.