Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters

Ui Min Choi; Frede Blaabjerg; Kyo Beum Lee

doi:10.1109/TIA.2015.2399611

Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters

Ui Min Choi, Frede Blaabjerg, Kyo Beum Lee

Media IT Engineering Program

Research output: Contribution to journal › Article › peer-review

87 Scopus citations

Abstract

The centralized topology with three-level inverters are widely used in photovoltaic (PV) systems due to their less installation costs and complexity. However, the common maximum power point tracking (MPPT) is a disadvantage of the centralized topology particularly under the partial shading and panel mismatch conditions. In this system, if PV modules are separately connected to the split capacitor voltage, the MPPT efficiency can be improved by the proposed control strategy. By the proposed method, the two capacitor voltages can be controlled asymmetrically to perform the separate MPPTs of each PV module connected to separate capacitors. The outputs can be generated without distortion even if two capacitors are asymmetrically regulated. Simulation and experimental results verify the validity and feasibility of the proposed methods.

Original language	English
Article number	07031429
Pages (from-to)	3295-3303
Number of pages	9
Journal	IEEE Transactions on Industry Applications
Volume	51
Issue number	4
DOIs	https://doi.org/10.1109/TIA.2015.2399611
State	Published - 1 Jul 2015

Keywords

asymmetric capacitor voltage control
central inverter
PV inverter
T-type inverter
Thee-level inverter

UN SDGs

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

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10.1109/TIA.2015.2399611

Cite this

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title = "Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters",

abstract = "The centralized topology with three-level inverters are widely used in photovoltaic (PV) systems due to their less installation costs and complexity. However, the common maximum power point tracking (MPPT) is a disadvantage of the centralized topology particularly under the partial shading and panel mismatch conditions. In this system, if PV modules are separately connected to the split capacitor voltage, the MPPT efficiency can be improved by the proposed control strategy. By the proposed method, the two capacitor voltages can be controlled asymmetrically to perform the separate MPPTs of each PV module connected to separate capacitors. The outputs can be generated without distortion even if two capacitors are asymmetrically regulated. Simulation and experimental results verify the validity and feasibility of the proposed methods.",

keywords = "asymmetric capacitor voltage control, central inverter, PV inverter, T-type inverter, Thee-level inverter",

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

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AU - Choi, Ui Min

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AU - Lee, Kyo Beum

PY - 2015/7/1

Y1 - 2015/7/1

N2 - The centralized topology with three-level inverters are widely used in photovoltaic (PV) systems due to their less installation costs and complexity. However, the common maximum power point tracking (MPPT) is a disadvantage of the centralized topology particularly under the partial shading and panel mismatch conditions. In this system, if PV modules are separately connected to the split capacitor voltage, the MPPT efficiency can be improved by the proposed control strategy. By the proposed method, the two capacitor voltages can be controlled asymmetrically to perform the separate MPPTs of each PV module connected to separate capacitors. The outputs can be generated without distortion even if two capacitors are asymmetrically regulated. Simulation and experimental results verify the validity and feasibility of the proposed methods.

AB - The centralized topology with three-level inverters are widely used in photovoltaic (PV) systems due to their less installation costs and complexity. However, the common maximum power point tracking (MPPT) is a disadvantage of the centralized topology particularly under the partial shading and panel mismatch conditions. In this system, if PV modules are separately connected to the split capacitor voltage, the MPPT efficiency can be improved by the proposed control strategy. By the proposed method, the two capacitor voltages can be controlled asymmetrically to perform the separate MPPTs of each PV module connected to separate capacitors. The outputs can be generated without distortion even if two capacitors are asymmetrically regulated. Simulation and experimental results verify the validity and feasibility of the proposed methods.

KW - asymmetric capacitor voltage control

KW - central inverter

KW - PV inverter

KW - T-type inverter

KW - Thee-level inverter

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M3 - Article

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ER -

Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters

Abstract

Keywords

UN SDGs

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