基于电压暂降监测数据的工业用户耐受能力等级评估  

Evaluation of tolerance level for industrial users based on voltage sag monitoring data

作　　者：汪颖[1] 王曼 肖先勇[1] 周文 徐在德 WANG Ying;WANG Man;XIAO Xianyong;ZHOU Wen;XU Zaide(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Hebei Electric PowerCompany Electric Power Research Institute,Shijiazhuang 050021,China;State Grid Jiangxi Electric Power CompanyElectric Power Research Institute,Nanchang 330096,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [3]国网江西省电力有限公司电力科学研究院,江西南昌330096

出　　处：《供用电》2023年第5期3-11,共9页Distribution & Utilization

基　　金：国家自然科学基金项目(52077145)。

摘　　要：准确评估工业用户的电压暂降耐受能力,是保证电网公司顺利推进优质供电服务的基础工作。为解决现有评估方法对过程结果、参数依赖程度高的问题,提出基于电压暂降监测数据的工业用户耐受能力等级评估方法。首先,定义电压暂降期间的U-t、P-t轨迹,通过小波模极大值算法检测轨迹起止点,提取P-U轨迹;其次,提出P-U轨迹图像彩色编码方法,将P-U轨迹原始图转换为P-U轨迹RGB彩图;然后,提出基于改进AlexNet的耐受能力等级评估模型,对已知用户的图像与数据进行训练,输出未知用户的耐受能力等级评估结果;最后,通过算例分析,验证了所提评估方法的准确性与有效性。Accurate evaluation of the tolerance of industrial users under voltage sag is a fundamental work to ensure that grid companies smoothly promote premium power supply services.In order to solve the problem of high dependence of existing evaluation methods on process results and parameters,this paper proposes an evaluation method of tolerance level for industrial users based on voltage sag monitoring data.Firstly,U-t and P-t trajectories during voltage sags are defined,and the starting and ending points of the trajectories are detected using wavelet modulus maximum algorithm to extract P-U trajectories.Secondly,a color coding method for P-U trajectory images is proposed,which converts the original P-U trajectory image into an RGB color P-U trajectory image.Then,a tolerance level evaluation model based on improved AlexNet is proposed,which trains the images and data of known users,and outputs the tolerance level evaluation results of unknown users.Finally,an example is analyzed to verify the accuracy and effectiveness of the proposed evaluation method.

关 键 词：电压暂降 监测数据 耐受能力 小波模极大值 图像彩色编码 改进AlexNet 

分 类 号：TM721[电气工程—电力系统及自动化]