ZHAO Chaodai,SUN Yuanyuan,WANG Tongxun,et al.Partitioning Harmonic Evaluation Method for Power System Considering Multi-frequency Coupling Influences[J].Automation of Electric Power Systems,2026,50(17):228-239.
ZHAO Chaodai,SUN Yuanyuan,WANG Tongxun,et al.Partitioning Harmonic Evaluation Method for Power System Considering Multi-frequency Coupling Influences[J].Automation of Electric Power Systems,2026,50(17):228-239.DOI: 10.7500/AEPS20250707004.
Partitioning Harmonic Evaluation Method for Power System Considering Multi-frequency Coupling Influences
With the large-scale integration of power electronic devices into power systems
the increase in harmonic disturbance sources has led to continuously escalating harmonic pollution. Accurately evaluating the harmonic state of the power grid is of great guiding significance for power quality management. However
as the scale of power systems expands
harmonic disturbances exhibit pronounced coupling characteristics. The harmonic state estimation for the entire grid requires substantial computational resources. To enhance the accuracy of harmonic evaluation while reducing computational resource consumption
this paper proposes a partitioning harmonic evaluation method considering multi-frequency coupling influences. Firstly
in view of the strong coupling characteristics of harmonic
a coupling harmonic state estimation method is proposed for the refined evaluation of the harmonic state in the focus region. Secondly
an observable path identification algorithm based on measurement allocation is proposed to find all observable paths containing a specified focus bus. Finally
by selecting the focus region based on the observable paths
a coupling harmonic contribution evaluation method for non-focus regions is further proposed. This method clarifies the cross-frequency harmonic contribution from non-focus regions to the focus bus
constructing a global harmonic evaluation scheme for power systems that balances computational efficiency and evaluation completeness. Results of simulation verification conducted on a modified IEEE 33-bus system demonstrate that
compared with conventional algorithms
the proposed method effectively enhances the computational accuracy and efficiency of harmonic state estimation. Simultaneously
the proposed method precisely decouples the cross-frequency harmonic contributions from non-focus regions to the focus bus.
Lin Chaofan , Bie Zhaohong . Review of static modeling and quantitative analysis methods for uncertainties of new power systems [J]. Automation of Electric Power Systems , 2024 , 48 ( 19 ): 14 - 27 .
Chen Zhilin , Liu Hao , Bi Tianshu . Synchronous measurement data-driven classification method for disturbance sources in distribution networks [J]. Automation of Electric Power Systems , 2025 , 49 ( 18 ): 127 - 135 .
Wang Y , Ma H X , Xiao X Y , et al . Harmonic state estimation for distribution networks based on multi-measurement data [J]. IEEE Transactions on Power Delivery , 2023 , 38 ( 4 ): 2311 - 2325 .
Niu Shengsuo , Liang Zhirui , Zhang Jianhua , et al . Power system harmonic state estimation based on generalized ridge estimation [J]. Electric Power Automation Equipment , 2012 , 32 ( 7 ): 94 - 98 .
Ou Zhujian , Cheng Xingong , Zong Xiju , et al . Observability analysis of power grid harmonic state estimation [J]. Automation of Electric Power Systems , 2015 , 39 ( 6 ): 53 - 59 .
Yu K K C , Watson N R , Arrillaga J . An adaptive Kalman filter for dynamic harmonic state estimation and harmonic injection tracking [J]. IEEE Transactions on Power Delivery , 2005 , 20 ( 2 ): 1577 - 1584 .
Hu J X , Hu W H , Cao D , et al . Robust multiarea distribution system state estimation based on structure-informed graphic network and multitask Gaussian process [J]. IEEE Transactions on Industrial Informatics , 2024 , 20 ( 8 ): 10599 - 10612 .
Sun Y Y , Li S R , Xu Q S , et al . Harmonic contribution evaluation based on the distribution-level PMUs [J]. IEEE Transactions on Power Delivery , 2021 , 36 ( 2 ): 909 - 919 .
Sun Yuanyuan , Xu Qingshen , Ma Zhao , et al . Key technologies for harmonic source tracing in new power system in background of digitalization [J]. Automation of Electric Power Systems , 2024 , 48 ( 6 ): 154 - 169 .
Wang Junxiong , Zang Tianlei , Fu Ling , et al . Harmonic responsibility determination method for distribution network with wind turbines integration [J]. Power System Technology , 2020 , 44 ( 11 ): 4377 - 4386 .
Lin Shunfu , Yan Xinyu , Dai Yemin , et al . Estimation method of system harmonic impedance based on sub-space dynamic coefficient regression [J]. Automation of Electric Power Systems , 2020 , 44 ( 12 ): 146 - 153 .
Mai Xiaoqing , Zhang Yan , Zhang Tianhu , et al . Responsibility division of multiple harmonic sources considering the change of system operation mode [J]. Distribution & Utilization , 2023 , 40 ( 5 ): 34 - 43 .
Li Yahui , Sun Yuanyuan , Wang Qingyan , et al . Data-driven probabilistic harmonic power flow calculation based on source and load harmonic coupling model [J]. Proceedings of the CSEE , 2024 , 44 ( 11 ): 4323 - 4335 .
Zhang Lei , Sun Yuanyuan , Li Yahui , et al . Measurement data based analysis and modeling method for harmonic characteristics of direct-drive wind turbine [J]. Automation of Electric Power Systems , 2025 , 49 ( 3 ): 82 - 92 .
陈吉 . 混合量测环境下智能电网的动态状态估计 [D]. 武汉 : 华中科技大学 , 2020 .
Chen Ji . Dynamic state estimation for smart grid with hybrid measurements [D]. Wuhan : Huazhong University of Science and Technology , 2020 .
Chen Yihuang , Shao Zhenguo , Lin Junjie , et al . Interval harmonic robust state estimation method based on multi-source measurement data fusion [J]. Transactions of China Electrotechnical Society , 2024 , 39 ( 23 ): 7394 - 7405 .
Zhu Maolin , Liu Hao , Bi Tianshu . Dynamic state estimation of doubly-fed wind turbine based on observability analysis and multi-step prediction cubature Kalman filter [J]. Automation of Electric Power Systems , 2023 , 47 ( 3 ): 49 - 58 .
Han Pingping , Zhang Nan , Pan Wei , et al . Review of research on observability of distribution network state estimation [J]. Proceedings of the CSU-EPSA , 2022 , 34 ( 4 ): 11 - 21 .