Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System
The existence of high-frequency components in common-mode (CM) current would reduce the stability of a non-isolated PV grid-connected system. It has great impacts on the output power quality when the generated power from PV is low. The method of single CM inner loop in suppressing the high-frequency...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-10-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/8/11/2072 |
| _version_ | 1818929131153260544 |
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| author | Dongliang Liu Haoqi Zhu Ruiguang Zhao |
| author_facet | Dongliang Liu Haoqi Zhu Ruiguang Zhao |
| author_sort | Dongliang Liu |
| collection | DOAJ |
| description | The existence of high-frequency components in common-mode (CM) current would reduce the stability of a non-isolated PV grid-connected system. It has great impacts on the output power quality when the generated power from PV is low. The method of single CM inner loop in suppressing the high-frequency components has poor effect. Based on the CM equivalent circuit model and the cause analysis of the CM current, a novel dual CM inner loops method is proposed to restrain the high-frequency components in CM current. This method not only meets the grid connection demand of CM current, but also overcomes the high frequency resonant problem. Furthermore, the high-frequency components in CM current from the outer parasitic circuit are substantially reduced. Finally, the proposed method is verified by simulation and experimental results. |
| first_indexed | 2024-12-20T03:39:55Z |
| format | Article |
| id | doaj.art-19f59a3e32a842399950821bde6aa034 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-20T03:39:55Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-19f59a3e32a842399950821bde6aa0342022-12-21T19:54:46ZengMDPI AGApplied Sciences2076-34172018-10-01811207210.3390/app8112072app8112072Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected SystemDongliang Liu0Haoqi Zhu1Ruiguang Zhao2College of Automation, Hangzhou Dianzi University, Hangzhou 310018, ChinaCollege of Automation, Hangzhou Dianzi University, Hangzhou 310018, ChinaCollege of Automation, Hangzhou Dianzi University, Hangzhou 310018, ChinaThe existence of high-frequency components in common-mode (CM) current would reduce the stability of a non-isolated PV grid-connected system. It has great impacts on the output power quality when the generated power from PV is low. The method of single CM inner loop in suppressing the high-frequency components has poor effect. Based on the CM equivalent circuit model and the cause analysis of the CM current, a novel dual CM inner loops method is proposed to restrain the high-frequency components in CM current. This method not only meets the grid connection demand of CM current, but also overcomes the high frequency resonant problem. Furthermore, the high-frequency components in CM current from the outer parasitic circuit are substantially reduced. Finally, the proposed method is verified by simulation and experimental results.https://www.mdpi.com/2076-3417/8/11/2072Non-isolatedPV grid-connected systemcommon-mode currentinner loophigh-frequency component |
| spellingShingle | Dongliang Liu Haoqi Zhu Ruiguang Zhao Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System Applied Sciences Non-isolated PV grid-connected system common-mode current inner loop high-frequency component |
| title | Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System |
| title_full | Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System |
| title_fullStr | Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System |
| title_full_unstemmed | Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System |
| title_short | Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System |
| title_sort | novel common mode current suppression method in transformerless pv grid connected system |
| topic | Non-isolated PV grid-connected system common-mode current inner loop high-frequency component |
| url | https://www.mdpi.com/2076-3417/8/11/2072 |
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