A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset
The frequency component of the grid voltage plays a crucial role in ensuring the stable operation of power electronic grid-connected systems. When the grid voltage contains a DC offset disturbance, the parameter estimation methods in the literature suffer from estimation errors, and a filter is alwa...
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| Language: | English |
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/11122501/ |
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| author | Ji Xiao Jiaming Zhang Shishun Tan Youfeng Zhou |
| author_facet | Ji Xiao Jiaming Zhang Shishun Tan Youfeng Zhou |
| author_sort | Ji Xiao |
| collection | DOAJ |
| description | The frequency component of the grid voltage plays a crucial role in ensuring the stable operation of power electronic grid-connected systems. When the grid voltage contains a DC offset disturbance, the parameter estimation methods in the literature suffer from estimation errors, and a filter is always required to counteract its impact. In this paper, a nonlinear algebraic transformation method is proposed to eliminate the influence of the DC offset completely. By applying the nonlinear algebraic transformation to four consecutive sampling points, a first-order linear regression model of voltage is constructed for a single-phase grid affected by DC offset. This model inherently eliminates the offset’s impact on the model parameters. A parameter estimator is then developed for the linear regression model, and the frequency can be directly derived from the parameters of this model. Rigorous theoretical analyses confirm the stability and convergence of the proposed parameter estimator. Meanwhile, the results demonstrate that the proposed parameter estimator can globally track the frequency variations in single-phase grids with DC offset. Experimental results further confirm the efficacy of the proposed nonlinear algebraic transformation method. |
| format | Article |
| id | doaj-art-60db3fa9097441179604da8bcff4f648 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-60db3fa9097441179604da8bcff4f6482025-08-20T04:03:25ZengIEEEIEEE Access2169-35362025-01-011314139514140210.1109/ACCESS.2025.359760011122501A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC OffsetJi Xiao0Jiaming Zhang1Shishun Tan2Youfeng Zhou3https://orcid.org/0009-0007-1836-8515Marketing Service Center of State Grid Chongqing Electric Power Company, Chongqing, ChinaMarketing Service Center of State Grid Chongqing Electric Power Company, Chongqing, ChinaMarketing Service Center of State Grid Chongqing Electric Power Company, Chongqing, ChinaSchool of Mechano-Electronic Engineering, Xidian University, Xi’an, ChinaThe frequency component of the grid voltage plays a crucial role in ensuring the stable operation of power electronic grid-connected systems. When the grid voltage contains a DC offset disturbance, the parameter estimation methods in the literature suffer from estimation errors, and a filter is always required to counteract its impact. In this paper, a nonlinear algebraic transformation method is proposed to eliminate the influence of the DC offset completely. By applying the nonlinear algebraic transformation to four consecutive sampling points, a first-order linear regression model of voltage is constructed for a single-phase grid affected by DC offset. This model inherently eliminates the offset’s impact on the model parameters. A parameter estimator is then developed for the linear regression model, and the frequency can be directly derived from the parameters of this model. Rigorous theoretical analyses confirm the stability and convergence of the proposed parameter estimator. Meanwhile, the results demonstrate that the proposed parameter estimator can globally track the frequency variations in single-phase grids with DC offset. Experimental results further confirm the efficacy of the proposed nonlinear algebraic transformation method.https://ieeexplore.ieee.org/document/11122501/Frequency estimationDC offsetsingle-phase systemnonlinear algebraic transformation |
| spellingShingle | Ji Xiao Jiaming Zhang Shishun Tan Youfeng Zhou A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset IEEE Access Frequency estimation DC offset single-phase system nonlinear algebraic transformation |
| title | A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset |
| title_full | A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset |
| title_fullStr | A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset |
| title_full_unstemmed | A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset |
| title_short | A Precise and Efficient Frequency Estimation Method for Single-Phase Grid With DC Offset |
| title_sort | precise and efficient frequency estimation method for single phase grid with dc offset |
| topic | Frequency estimation DC offset single-phase system nonlinear algebraic transformation |
| url | https://ieeexplore.ieee.org/document/11122501/ |
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