基于主动学习的电力系统暂态稳定评估方法  

Transient stability assessment method in power system based on active learning

作　　者：谢培元[1] 袁文 刘永刚[1] 潘飞来[1] 叶文浩 杨俊 Xie Peiyuan;Yuan Wen;Liu Yonggang;Pan Feilai;Ye Wenhao;Yang Jun(State Grid Hunan Electric Power Company,Changsha 410007,China;State Grid Changde Power Supply Company,Changde 415001,Hunan China;State Grid Changsha Power Supply Company,Changsha 410015,China)

机构地区：[1]国网湖南省电力公司,长沙410007 [2]国网常德供电分公司,湖南常德415001 [3]国网长沙供电分公司,长沙410015

出　　处：《电测与仪表》2021年第5期86-91,共6页Electrical Measurement & Instrumentation

基　　金：国网湖南省电力有限公司科技项目(5216K0160001)。

摘　　要：随着泛在电力物联网概念的提出,暂态稳定在电力系统运行控制中扮演着越来越重要的角色。由于相量测量单元(Phasor Measurement Unit,PMU)的广泛配置,基于机器学习的暂态稳定实时评估方法展现出了巨大的发展潜力。针对这类方法在应用中离线训练数据生成耗时及造成的难以在网架发生变化后快速更新模型的问题,论文提出了一种基于主动学习的电力系统暂态稳定评估方法。考虑不同运行方式、不同故障下进行短时间仿真(仿真至故障切除时刻)生成无标注样本;随机选取一部分样本进行长时间仿真以标注这些样本的稳定状态,并进一步训练基于支持向量机的暂态稳定评估模型;最后循环选择剩余未标注样本中信息熵较高的部分数据进行标注对模型重新训练,直至模型准确率不再变化。在新英格兰10机39节点测试电力系统的仿真表明,论文提出的方法能够有效降低离线仿真的时间,大大提高评估模型部署的效率,并对广域噪声具有鲁棒性。With the concept of ubiquitous power internet of things,the transient stability plays an increasingly important role in the operation and control of power system.Due to the extensive configuration of the phasor measurement unit(PMU),the real-time evaluation method of machine-based transient stability shows great potential for development.Aiming at the problem that data generation of the offline training is time-consuming and it is difficult to update the model quickly after the grid changes,this paper proposes a power system transient stability assessment method based on active learning.Firstly,implementing short-time simulations(simulation to fault clearing time)to generate unlabeled samples in different kind of operations and faults;and then,randomly select a part of samples for long-term simulation to mark these samples;Then,a part of samples are randomly selected for long-term simulation to be labeled with transient stability status,and support vector machine is further trained to build the transient stability assessment model;Finally,the data with high information entropy in the remaining unlabeled samples is re-trained until the model accuracy does not change.The simulation of the New England 10-machine 39-bus test power system shows that the proposed method can effectively reduce the time of offline simulation,which greatly improves the efficiency of model configuration,and it is robust to wide-area noise.

关 键 词：泛在电力物联网概念 相量测量单元 主动学习 暂态稳定评估 

分 类 号：TM93[电气工程—电力电子与电力传动]