基于数字孪生的柔性直流线路保护中不良数据自纠错方法  

A self-correcting method for bad data in flexible DC line protection based on digital twinning

作　　者：和敬涵[1] 韦智腾 李猛 聂铭 高嫦霞 张海钰 HE Jinghan;WEI Zhiteng;LI Meng;NIE Ming;GAO Changxia;ZHANG Haiyu(School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《电力工程技术》2023年第6期141-152,共12页Electric Power Engineering Technology

基　　金：国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U2066210)。

摘　　要：直流线路保护是柔性直流电网发展的关键,需要在3 ms内完成故障判别。现有学者提出基于数字孪生的柔性直流线路保护方法,具有速度快、灵敏性高等优点,但其可靠性易受互感器测量异常影响,可能导致保护误动作。现有不良数据检测方法的准确性和快速性难以满足直流控制保护设备的需求,因此为提高该保护方法的可靠性,文中提出一种基于移动平均法的不良数据自纠错方法。根据测量数据平稳变化的时序特性,利用移动平均法得到测量数据的预测值,通过比较预测误差与实际误差进行不良数据的检测与纠错,无需迭代计算和预先训练模型。利用四端柔性直流电网进行仿真检验,结果表明相较于已有方法,所提方法具有更好的准确性与快速性,纠错性能较好,能适配保护方法并提升抗干扰能力,有效提高保护的可靠性。DC line protection is the key to the development of flexible DC grids,and fault identification within 3 ms is required.Existing scholars have proposed a digital twinning based flexible DC line protection method with high speed and sensitivity advantages.However,its reliability is easily affected by transformer measurements,which may lead to protection misoperation.The requirements of DC control protection equipment can be hardly meted by existing bad data detection methods with insufficient accuracy and rapidity.Therefore,in order to improve the reliability of this protection method,a self-correcting method of bad data based on the moving average method is proposed in this paper.The predicted value of the measured data is obtained by using the moving average method according to the time sequence characteristics of the steady change of the measured data,and the bad data is detected and corrected by comparing the predicted error and the actual error,without iterative calculation and pre-trained model.The results of a simulation test using the four-terminal flexible DC grid show that the proposed method has higher accuracy and rapidity with good error correction performance than any existing method does,and it can be adapted to the protection method and improve the anti-interference capability as well as the reliability of protection in an effective manner.

关 键 词：柔性直流 动态状态估计 直流互感器 不良数据辨识 时间序列预测 移动平均法 

分 类 号：TM77[电气工程—电力系统及自动化]