Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters

Ui Min Choi; Frede Blaabjerg; Kyo Beum Lee

doi:10.1109/APEC.2014.6803537

Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters

Ui Min Choi
, Frede Blaabjerg
, Kyo Beum Lee

Media IT Engineering Program

Aalborg University
Ajou University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

7 Scopus citations

Abstract

To improve the efficiency of the photovoltaic (PV) system, the centralized topology using three-level inverters are widely used. In this system, PV modules are separately connected to the split DC-links. This causes a decrease of maximum power point tracking (MPPT) efficiency under the partial shading condition. This paper proposes an independent control of two DC-link voltages for separate MPPT of each PV module in three-level inverters. The proposed method is simply implemented by adding or subtracting the time-offset to the three-phase turn-on times and modifying the reference voltages without complex calculations or any additional hardware. Simulations and experimental results verify the validity and feasibility of the proposed methods.

Original language	English
Title of host publication	APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1718-1724
Number of pages	7
ISBN (Print)	9781479923250
DOIs	https://doi.org/10.1109/APEC.2014.6803537
State	Published - 2014
Event	29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014 - Fort Worth, TX, United States Duration: 16 Mar 2014 → 20 Mar 2014

Publication series

Name	Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference	29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014
Country/Territory	United States
City	Fort Worth, TX
Period	16/03/14 → 20/03/14

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

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10.1109/APEC.2014.6803537

Cite this

Choi, U. M., Blaabjerg, F., & Lee, K. B. (2014). Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters. In APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition (pp. 1718-1724). Article 6803537 (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2014.6803537

Choi, Ui Min ; Blaabjerg, Frede ; Lee, Kyo Beum. / Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters. APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc., 2014. pp. 1718-1724 (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

@inproceedings{3baa740f6f4d462cb9330eec221cf213,

title = "Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters",

abstract = "To improve the efficiency of the photovoltaic (PV) system, the centralized topology using three-level inverters are widely used. In this system, PV modules are separately connected to the split DC-links. This causes a decrease of maximum power point tracking (MPPT) efficiency under the partial shading condition. This paper proposes an independent control of two DC-link voltages for separate MPPT of each PV module in three-level inverters. The proposed method is simply implemented by adding or subtracting the time-offset to the three-phase turn-on times and modifying the reference voltages without complex calculations or any additional hardware. Simulations and experimental results verify the validity and feasibility of the proposed methods.",

author = "Choi, \{Ui Min\} and Frede Blaabjerg and Lee, \{Kyo Beum\}",

year = "2014",

doi = "10.1109/APEC.2014.6803537",

language = "English",

isbn = "9781479923250",

series = "Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

pages = "1718--1724",

booktitle = "APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition",

note = "29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014 ; Conference date: 16-03-2014 Through 20-03-2014",

}

Choi, UM, Blaabjerg, F & Lee, KB 2014, Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters. in APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition., 6803537, Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Institute of Electrical and Electronics Engineers Inc., pp. 1718-1724, 29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014, Fort Worth, TX, United States, 16/03/14. https://doi.org/10.1109/APEC.2014.6803537

Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters. / Choi, Ui Min; Blaabjerg, Frede; Lee, Kyo Beum.
APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc., 2014. p. 1718-1724 6803537 (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters

AU - Choi, Ui Min

AU - Blaabjerg, Frede

AU - Lee, Kyo Beum

PY - 2014

Y1 - 2014

N2 - To improve the efficiency of the photovoltaic (PV) system, the centralized topology using three-level inverters are widely used. In this system, PV modules are separately connected to the split DC-links. This causes a decrease of maximum power point tracking (MPPT) efficiency under the partial shading condition. This paper proposes an independent control of two DC-link voltages for separate MPPT of each PV module in three-level inverters. The proposed method is simply implemented by adding or subtracting the time-offset to the three-phase turn-on times and modifying the reference voltages without complex calculations or any additional hardware. Simulations and experimental results verify the validity and feasibility of the proposed methods.

AB - To improve the efficiency of the photovoltaic (PV) system, the centralized topology using three-level inverters are widely used. In this system, PV modules are separately connected to the split DC-links. This causes a decrease of maximum power point tracking (MPPT) efficiency under the partial shading condition. This paper proposes an independent control of two DC-link voltages for separate MPPT of each PV module in three-level inverters. The proposed method is simply implemented by adding or subtracting the time-offset to the three-phase turn-on times and modifying the reference voltages without complex calculations or any additional hardware. Simulations and experimental results verify the validity and feasibility of the proposed methods.

UR - https://www.scopus.com/pages/publications/84900385576

U2 - 10.1109/APEC.2014.6803537

DO - 10.1109/APEC.2014.6803537

M3 - Conference contribution

AN - SCOPUS:84900385576

SN - 9781479923250

T3 - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

SP - 1718

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BT - APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014

Y2 - 16 March 2014 through 20 March 2014

ER -

Choi UM, Blaabjerg F, Lee KB. Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters. In APEC 2014 - 29th Annual IEEE Applied Power Electronics Conference and Exposition. Institute of Electrical and Electronics Engineers Inc. 2014. p. 1718-1724. 6803537. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC). doi: 10.1109/APEC.2014.6803537

Independent control strategy of two DC-link voltages for separate MPPTs in transformerless photovoltaic systems using neutral-point-clamped inverters

Abstract

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