A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT
Nowadays, photovoltaic (PV) systems based on centralized topology with a three-level T-type (3LT<sup>2</sup>) inverter are used to decrease investment costs and increase conversion efficiency. In this topology, the split capacitors of the DC-link can individually connected to PV arrays....
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2021
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oai:doaj.org-article:199f1b5ac0d74fff91303d3710a9a17b2021-11-18T00:09:55ZA Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT2169-353610.1109/ACCESS.2021.3124295https://doaj.org/article/199f1b5ac0d74fff91303d3710a9a17b2021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9594787/https://doaj.org/toc/2169-3536Nowadays, photovoltaic (PV) systems based on centralized topology with a three-level T-type (3LT<sup>2</sup>) inverter are used to decrease investment costs and increase conversion efficiency. In this topology, the split capacitors of the DC-link can individually connected to PV arrays. Accordingly, DC-link capacitors’ voltage should separately controlled to track PV arrays’ maximum power point (MPP) voltage. However, the asymmetric control of capacitors’ voltage causes line voltage to unbalance and output current to distort. In this paper, a hybrid method based on dipolar variable injection and zero-sequence voltage injection concepts is proposed to simultaneously control the DC-link capacitors’ voltage of the 3LT<sup>2</sup> inverter and eliminate their voltages ripple. In the presence of partial shading, the proposed method can control the capacitors’ voltage of the DC-link to realize the separate MPP tracking while ensuring the balance of line voltages. Furthermore, the proposed method eliminates the voltage ripple on DC-link capacitors, inherently caused by the 3LT<sup>2</sup> inverter, to improve the DC-link lifetime and the PV system reliability. The simulation studies and practical experiments have been performed, and their results prove the validity of the proposed method, whether the PF is unity or non-unity.Mohammadreza LakTing-Lien WuTzung-Lin LeeIEEEarticleThree-level T-type (3LT²) inverterneutral point voltage (NPV) ripple eliminationseparate maximum power point tracking (MPPT)dipolar modulationzero-sequence voltage (ZSV) injectionphotovoltaic (PV) systemElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 9, Pp 148650-148664 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
Three-level T-type (3LT²) inverter neutral point voltage (NPV) ripple elimination separate maximum power point tracking (MPPT) dipolar modulation zero-sequence voltage (ZSV) injection photovoltaic (PV) system Electrical engineering. Electronics. Nuclear engineering TK1-9971 |
| spellingShingle |
Three-level T-type (3LT²) inverter neutral point voltage (NPV) ripple elimination separate maximum power point tracking (MPPT) dipolar modulation zero-sequence voltage (ZSV) injection photovoltaic (PV) system Electrical engineering. Electronics. Nuclear engineering TK1-9971 Mohammadreza Lak Ting-Lien Wu Tzung-Lin Lee A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| description |
Nowadays, photovoltaic (PV) systems based on centralized topology with a three-level T-type (3LT<sup>2</sup>) inverter are used to decrease investment costs and increase conversion efficiency. In this topology, the split capacitors of the DC-link can individually connected to PV arrays. Accordingly, DC-link capacitors’ voltage should separately controlled to track PV arrays’ maximum power point (MPP) voltage. However, the asymmetric control of capacitors’ voltage causes line voltage to unbalance and output current to distort. In this paper, a hybrid method based on dipolar variable injection and zero-sequence voltage injection concepts is proposed to simultaneously control the DC-link capacitors’ voltage of the 3LT<sup>2</sup> inverter and eliminate their voltages ripple. In the presence of partial shading, the proposed method can control the capacitors’ voltage of the DC-link to realize the separate MPP tracking while ensuring the balance of line voltages. Furthermore, the proposed method eliminates the voltage ripple on DC-link capacitors, inherently caused by the 3LT<sup>2</sup> inverter, to improve the DC-link lifetime and the PV system reliability. The simulation studies and practical experiments have been performed, and their results prove the validity of the proposed method, whether the PF is unity or non-unity. |
| format |
article |
| author |
Mohammadreza Lak Ting-Lien Wu Tzung-Lin Lee |
| author_facet |
Mohammadreza Lak Ting-Lien Wu Tzung-Lin Lee |
| author_sort |
Mohammadreza Lak |
| title |
A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| title_short |
A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| title_full |
A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| title_fullStr |
A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| title_full_unstemmed |
A Hybrid Method for Three-Level T-Type Inverters to Eliminate Neutral Point Voltage Ripple and Control DC-Link Capacitors’ Voltage for Separate MPPT |
| title_sort |
hybrid method for three-level t-type inverters to eliminate neutral point voltage ripple and control dc-link capacitors’ voltage for separate mppt |
| publisher |
IEEE |
| publishDate |
2021 |
| url |
https://doaj.org/article/199f1b5ac0d74fff91303d3710a9a17b |
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