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Study on Harmonic Impedance Estimation and Harmonic Contribution Evaluation Index [PDF]

IEEE Access, 2020
Harmonic impedance estimation and suitable evaluation index selection are the key steps of harmonic contribution evaluation. Most of the traditional harmonic impedance estimation methods are only applicable to the scenario, where the background harmonic ...
Ziteng Liu, Yonghai Xu, Haiwei Jiang, Shun Tao   +3 more
doaj   +3 more sources

Estimation of harmonic impedance and harmonic contribution with harmonic complex power in the absence of harmonic phase angle

IET Generation, Transmission & Distribution, 2023
Estimation of harmonic impedances and harmonic contributions is beneficial to harmonic control, and harmonic phasors data is necessary for the existing estimation methods.
Hongru Zheng, Fangwei Xu, Qin Shu, Chuan Wang, Quan Zhou   +4 more
doaj   +3 more sources

Study on the Estimation of Utility Harmonic Impedance Based on Minimum Norm of Impedance Difference [PDF]

IEEE Access, 2020
The existing methods for estimating harmonic impedance usually assume that harmonic impedance is constant in a measurement period. However, for a variety of practical reasons, such as the load change of power grid, utility harmonic impedance may be ...
Fangwei Xu, Chuan Wang, Qin Shu, Zhiquan Ma, Hongru Zheng, Anqing Peng   +5 more
doaj   +3 more sources

Novelty method for the utility harmonic impedance estimation based on Gaussian mixed model

IET Generation, Transmission & Distribution, 2020
The accurate estimation of harmonic impedance on the utility side of a point of common coupling (PCC) is much important to harmonic control, harmonic emission level, and harmonic responsibility analysis.
Zhirong Tang, Qin Shu, Fangwei Xu, Yue Jiang   +3 more
doaj   +3 more sources

Utility harmonic impedance estimation based on time series clustering and improved Pettitt method

International Journal of Electrical Power & Energy Systems
Utility harmonic impedance estimation is critical for power quality assessment and improvement. Noninvasive methods without injecting harmonics are widely adopted to estimate utility harmonic impedance using natural load variations.
Wentao Li, Shunliang Wang, Hao Tu, Hong Miao, Ning Jiao, Tianqi Liu   +5 more
doaj   +3 more sources

Independent Component Analysis-Based Harmonic Transfer Impedance Estimation for Networks with Multiple Harmonic Sources

Energies
This paper presents a novel methodology to estimate the harmonic transfer impedances in electric power systems with multiple harmonic sources (HSs). The purpose is to determine the responsibility of each HS for the total harmonic distortion at a specific
Mateus M. de Oliveira, Leandro R. M. Silva, Igor D. Melo, Carlos A. Duque, Paulo F. Ribeiro   +4 more
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Study on Harmonic Impedance Estimation Based on Gaussian Mixture Regression Using Railway Power Supply Loads

Energies, 2022
There are a huge number of harmonics in the railway power supply system. Accurately estimating the harmonic impedance of the system is the key to evaluating the harmonic emission level of the power supply system. A harmonic impedance estimation method is
Yankun Xia, Wenzhang Tang
doaj   +2 more sources

A new method for harmonic impedance estimation [PDF]

2018 18th International Conference on Harmonics and Quality of Power (ICHQP), 2018
Determining the harmonic responsibilities of utility and customer side at a PCC has been a great concern in harmonic research, and utility harmonic impedance is a key factor for assessing harmonic emission levels. When background harmonic is unstable, traditional methods have a large error.
Fang-Wei Xu, Lu Wang, Jin-Shuai Zhao, Ying Chen, Lin Xu, Can Hu   +5 more
openaire   +2 more sources

A Harmonic Impedance Estimation Method Based on the Cauchy Mixed Model

Mathematical Problems in Engineering, 2020
In this paper, a new method without any tradition assumption to estimate the utility harmonic impedance of a point of common coupling (PCC) is proposed. But, the existing estimation methods usually are built on some assumptions, such as, the background harmonic is stable and small, the harmonic impedance of the customer side is much larger than that of
Zhirong Tang, Huaqiang Li, Fangwei Xu, Qin Shu, Yue Jiang   +4 more
openaire   +3 more sources

Harmonic impedance estimation based on improved rank estimation

Journal of Physics: Conference Series
Abstract In response to the issue of harmonic data anomalies affecting harmonic impedance estimation, a method based on improved rank regression is proposed, building upon the foundation of rank estimation. This method utilizes harmonic data sampled from the point of common coupling, treating harmonic impedance as regression parameters ...
Dianlang Wang, Jing Chen, Qi Yin, Hanlin Ding, Qingsong Liu, Hong Miao   +5 more
openaire   +2 more sources