融合多源量测数据的区间型抗差谐波状态估计  

Interval Harmonic Robust State Estimation Method Based on Multi-Source Measurement Data Fusion

作　　者：陈艺煌 邵振国 林俊杰[1,2] 张嫣 陈飞雄[1,2] Chen Yihuang;Shao Zhenguo;Lin Junjie;Zhang Yan;Chen Feixiong(Key Laboratory of Energy Digitalization,Fuzhou 350108 China;College of Electrical Engineering and Automation Fuzhou University,Fuzhou 350108 China)

机构地区：[1]数字能源福建省高校重点实验室,福州350108 [2]福州大学电气工程与自动化学院,福州350108

出　　处：《电工技术学报》2024年第23期7394-7405,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52377087)。

摘　　要：在相量测量单元(PMU)配置数量不足以满足谐波状态估计的可观性条件时,可将电能质量监测装置(PQMD)作为数据补充源。该文针对多源量测数据存在的同步性差异和量测偏差等问题,提出一种融合PMU与PQMD量测数据的区间型抗差谐波状态估计方法。首先,根据PQMD检测起始时刻不同步的特征,提出基于重叠度指标的PMU与PQMD量测数据融合方法;其次,采用量测变换从PQMD功率量测数据得到等效电流相量量测,构建区间型混合量测全集;再次,采用投影统计法和改进Huber权函数计算量测权重,对重叠度低且残差大的量测赋予较小的权重以抑制量测偏差的影响,并根据权重大小优选测点,得到非同步量测偏差最小的量测子集;最后,通过迭代重加权最小二乘法求解状态估计模型,在IEEE 30系统验证了该文所提方法的可行性与有效性。Harmonic state estimation is a key part of power system operation management,which can be used to monitor the harmonic in the power grid and provide an important reference for the stable operation of the power grid.At present,the number of phasor measurement unit(PMU)configurations are difficult to satisfy the observability requirements of state estimation.It is necessary to adapt power quality monitoring device(PQMD)data to improve the redundancy of measurement and make the harmonic state estimation possible.However,the non-synchronized monitoring data characteristics of PQMD make the fused measurement data still have deviations,which will lead to a large error in harmonic estimation state.Fusing PMU and PQMD measurement data and minimizing the asynchronous measurement bias of PQMD measurement data,as well as suppressing the influence of this measurement bias in state estimation,will provide a more effective means for grid harmonic analysis.Therefore,the paper proposes an interval robust harmonic state estimation method based on PMU and PQMD measurement data fusion.Firstly,the detection period of PQMD is selected with the overlap index,and the reference period is selected with the maximum overlap as the target.The selected reference period is used as the measurement buffer of PMU,and the PQMD measurement data in this period is fused to form an interval mixed measurement set.The harmonic power measurements of PQMD are converted into equivalent harmonic current phasor measurement by the measurement transformation strategy,which is updated with state quantity in iterative solution.Secondly,the projection statistical method is used to calculate the initial weight of the measurement,and the overlap index is introduced into the Huber weight function to adjust the measurement weight.The measurement with low overlap and large residual is given a small weight to suppress the influence of measurement deviation,and further improve the robustness of the algorithm.Finally,the measurement points are preferring according to th

关 键 词：同步相量量测 电能质量监测装置 多源量测数据融合 区间算法 谐波状态估计 

分 类 号：TM711[电气工程—电力系统及自动化]