A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency
In a single-phase grid-tie system, the presence of a second harmonic current (SHC) on the DC side reduces the conversion efficiency and lifetime of the DC source. For a system whose front-end is a boost type converter, a digital band-stop filter (BSF) with a center frequency of 120 Hz could be intro...
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IEEE
2025-01-01
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| Online Access: | https://ieeexplore.ieee.org/document/10843191/ |
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| author | Jun-Hyeong Kwon Guangxu Zhou Chun-Sung Kim Sung-Jun Park Yipei Wang |
| author_facet | Jun-Hyeong Kwon Guangxu Zhou Chun-Sung Kim Sung-Jun Park Yipei Wang |
| author_sort | Jun-Hyeong Kwon |
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| description | In a single-phase grid-tie system, the presence of a second harmonic current (SHC) on the DC side reduces the conversion efficiency and lifetime of the DC source. For a system whose front-end is a boost type converter, a digital band-stop filter (BSF) with a center frequency of 120 Hz could be introduced in the voltage sampling loop to suppress the SHC. However, in a grid that relatively lacks inertial support, the frequency will fluctuate over a broader range, resulting in a corresponding variation in the pulsation frequency of the SHC. Based on this, the digital BSF is combined with a phase-locked loop, and the center frequency is further designed to track the acquired grid frequency in real-time. The parameters of the BSF are updated in each interrupt program to provide optimal SHC suppression performance for arbitrary frequencies. An experimental prototype is built and tested. In the case of the grid frequency fluctuating continuously, the proposed method can effectively suppress SHC with a percentage of about 1% at all frequencies, which proves its validity and stability. |
| format | Article |
| id | doaj-art-7a250c097d3a44289733ca4b5c8f72cd |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
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| series | IEEE Access |
| spelling | doaj-art-7a250c097d3a44289733ca4b5c8f72cd2025-01-28T00:01:08ZengIEEEIEEE Access2169-35362025-01-0113132501326310.1109/ACCESS.2025.352988610843191A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid FrequencyJun-Hyeong Kwon0https://orcid.org/0009-0008-4614-6247Guangxu Zhou1Chun-Sung Kim2Sung-Jun Park3https://orcid.org/0000-0001-8337-2333Yipei Wang4https://orcid.org/0000-0002-4386-981XDepartment of Electrical Engineering, Chonnam National University, Gwangju, South KoreaInstitute of Automation, Shandong Provincial Key Laboratory of Automotive Electronics Technology, Qilu University of Technology (Shandong Academy of Sciences), Jinan, ChinaEnergy Innovative Industry Research and Development Department, Green Energy Institute, Naju, South KoreaDepartment of Electrical Engineering, Chonnam National University, Gwangju, South KoreaInstitute of Automation, Shandong Provincial Key Laboratory of Automotive Electronics Technology, Qilu University of Technology (Shandong Academy of Sciences), Jinan, ChinaIn a single-phase grid-tie system, the presence of a second harmonic current (SHC) on the DC side reduces the conversion efficiency and lifetime of the DC source. For a system whose front-end is a boost type converter, a digital band-stop filter (BSF) with a center frequency of 120 Hz could be introduced in the voltage sampling loop to suppress the SHC. However, in a grid that relatively lacks inertial support, the frequency will fluctuate over a broader range, resulting in a corresponding variation in the pulsation frequency of the SHC. Based on this, the digital BSF is combined with a phase-locked loop, and the center frequency is further designed to track the acquired grid frequency in real-time. The parameters of the BSF are updated in each interrupt program to provide optimal SHC suppression performance for arbitrary frequencies. An experimental prototype is built and tested. In the case of the grid frequency fluctuating continuously, the proposed method can effectively suppress SHC with a percentage of about 1% at all frequencies, which proves its validity and stability.https://ieeexplore.ieee.org/document/10843191/Grid-tie invertersecond harmonic currentphase-locked loopdigital band-stop filtergrid frequency fluctuation |
| spellingShingle | Jun-Hyeong Kwon Guangxu Zhou Chun-Sung Kim Sung-Jun Park Yipei Wang A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency IEEE Access Grid-tie inverter second harmonic current phase-locked loop digital band-stop filter grid frequency fluctuation |
| title | A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency |
| title_full | A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency |
| title_fullStr | A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency |
| title_full_unstemmed | A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency |
| title_short | A Second Harmonic Current Suppression Strategy Based on a Digital Band-Stop Filter With Center Frequency Tracking Grid Frequency |
| title_sort | second harmonic current suppression strategy based on a digital band stop filter with center frequency tracking grid frequency |
| topic | Grid-tie inverter second harmonic current phase-locked loop digital band-stop filter grid frequency fluctuation |
| url | https://ieeexplore.ieee.org/document/10843191/ |
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