Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions
In order to solve the neutral-point voltage unbalancing problem for neutral-point clamped (NPC) three-level inverters under non-ideal grid conditions, a novel zero-sequence component injection method for modulation signals was proposed in this paper. Based on the mathematical expressions of neutral-...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-05-01
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| Series: | Energies |
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| Online Access: | http://www.mdpi.com/1996-1073/11/6/1331 |
| _version_ | 1798002412032622592 |
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| author | Jian Guo Lyu Ji Dong Wang Wen Bin Hu Zhao Feng Wu |
| author_facet | Jian Guo Lyu Ji Dong Wang Wen Bin Hu Zhao Feng Wu |
| author_sort | Jian Guo Lyu |
| collection | DOAJ |
| description | In order to solve the neutral-point voltage unbalancing problem for neutral-point clamped (NPC) three-level inverters under non-ideal grid conditions, a novel zero-sequence component injection method for modulation signals was proposed in this paper. Based on the mathematical expressions of neutral-point voltage unbalancing, the fluctuation of the neutral-point voltage under different grid conditions was studied. The proposed method dynamically calculates the zero-sequence component for modulation signals by region selections based on sinusoidal pulse width modulation (DCR-SPWM). Under non-ideal grid conditions, this DCR-SPWM method can control the neutral-point voltage balance for NPC three-level inverters with different grid and output power conditions, and improves the grid current quality. The simulation results verified the correctness of the theoretical analysis in this paper, and the feasibility and effectiveness of this method were verified by the experiments in the experimental platform of the NPC three-level grid-connected inverter based on DSP-CPLD controllers. |
| first_indexed | 2024-04-11T11:52:51Z |
| format | Article |
| id | doaj.art-3630cc4ed16b43cba6d3d9aedbef4552 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T11:52:51Z |
| publishDate | 2018-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-3630cc4ed16b43cba6d3d9aedbef45522022-12-22T04:25:16ZengMDPI AGEnergies1996-10732018-05-01116133110.3390/en11061331en11061331Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid ConditionsJian Guo Lyu0Ji Dong Wang1Wen Bin Hu2Zhao Feng Wu3Nanjing University of Science and Technology, Nanjing 210094, ChinaNanjing University of Science and Technology, Nanjing 210094, ChinaNanjing University of Science and Technology, Nanjing 210094, ChinaNanjing University of Science and Technology, Nanjing 210094, ChinaIn order to solve the neutral-point voltage unbalancing problem for neutral-point clamped (NPC) three-level inverters under non-ideal grid conditions, a novel zero-sequence component injection method for modulation signals was proposed in this paper. Based on the mathematical expressions of neutral-point voltage unbalancing, the fluctuation of the neutral-point voltage under different grid conditions was studied. The proposed method dynamically calculates the zero-sequence component for modulation signals by region selections based on sinusoidal pulse width modulation (DCR-SPWM). Under non-ideal grid conditions, this DCR-SPWM method can control the neutral-point voltage balance for NPC three-level inverters with different grid and output power conditions, and improves the grid current quality. The simulation results verified the correctness of the theoretical analysis in this paper, and the feasibility and effectiveness of this method were verified by the experiments in the experimental platform of the NPC three-level grid-connected inverter based on DSP-CPLD controllers.http://www.mdpi.com/1996-1073/11/6/1331non-ideal gridthree-level invertersneutral-point voltage balancemodulation signalsregion selection |
| spellingShingle | Jian Guo Lyu Ji Dong Wang Wen Bin Hu Zhao Feng Wu Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions Energies non-ideal grid three-level inverters neutral-point voltage balance modulation signals region selection |
| title | Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions |
| title_full | Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions |
| title_fullStr | Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions |
| title_full_unstemmed | Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions |
| title_short | Research on the Neutral-Point Voltage Balance for NPC Three-Level Inverters under Non-Ideal Grid Conditions |
| title_sort | research on the neutral point voltage balance for npc three level inverters under non ideal grid conditions |
| topic | non-ideal grid three-level inverters neutral-point voltage balance modulation signals region selection |
| url | http://www.mdpi.com/1996-1073/11/6/1331 |
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