Eliminating Leakage Currents in Neutral Point Clamped Inverters for Photovoltaic Systems

Cavalcanti, Marcelo C.; Farias, A. M.; Oliveira, K. C.; Neves, Francisco A. S.; Afonso, João L.

doi:10.1109/tie.2011.2138671

Cited by 214 publications

(78 citation statements)

References 18 publications

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“…NPC-based commercial solutions to interface relatively large Wind Energy Conversion Systems to medium voltage transmission lines are already available in the market [2]- [4]. The utilisation of NPC converters in micro-grids and low voltage distribution systems has also been reported [5]. In this sort of applications the advantages of the NPC converters are mainly the high effective switching frequency, allowing a noticeable reduction in the filter size, and the high overall efficiency which is important in some applications, e.g to interface photo voltaic (PV) energy to domiciliary and power plants applications [4], [6].…”

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confidence: 99%

A Simplified Space-Vector Modulation Algorithm for Four-Leg NPC Converters

Rojas

Cárdenas

Kennel

et al. 2017

IEEE Trans. Power Electron.

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Abstract-To interface generation sources and loads to fourwire distribution networks is important to use power converters and modulation methods which provide high performance, flexibility and reliability. To achieve these goals, this paper proposes a simple and efficient Space Vector Modulation (SVM) algorithm in αβγ coordinates for Neutral Point Clamped (NPC) converters. The proposed SVM method reduces a three-dimensional (αβγ) search of the modulating vectors into a simple two-dimensional (αβ) problem. Moreover, the algorithm provides full utilisation of the dc-link voltage, full utilisation of the redundant vectors and it can be applied to any other four-leg converter topology. The proposed SVM has been successfully validated using a 6kW three-level four-leg NPC converter, achieving control over the voltages of the dc-link capacitors and simple definition of switching pattern for shaping frequency spectrum.

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confidence: 99%

A Simplified Space-Vector Modulation Algorithm for Four-Leg NPC Converters

Rojas

Cárdenas

Kennel

et al. 2017

IEEE Trans. Power Electron.

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“…The transformerless photovoltaic (PV) inverters have the advantages of low cost, small size, light weight and high efficiency [1]- [3]. However, the leakage current will arise due to lack of galvanic isolation.…”

Section: Introductionmentioning

confidence: 99%

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

Guo

Jia

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-Leakage current reduction is one of the important issues for the transformelress PV systems. In this paper, the transformerless single-phase cascaded H-bridge PV inverter is investigated. The common mode model for the cascaded H4 inverter is analyzed. And the reason why the conventional cascade H4 inverter fails to reduce the leakage current is clarified. In order to solve the problem, a new cascaded H5 inverter is proposed to solve the leakage current issue. Finally, the experimental results are presented to verify the effectiveness of the proposed topology with the leakage current reduction for the singlephase transformerless PV systems.

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“…In [10] different SVPWM techniques are presented to eliminate leakage currents in transformerless PV systems.…”

Section: Introductionmentioning

confidence: 99%

A Simplified SVPWM for Three Level Inverters to Eliminate Leakage Currents in Transformeless Photovoltaic Systems

Ansari¹,

Kim²

2016

The Transactions of The Korean Institute of Electrical Engineer

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-This paper proposes a simplified SVPWM for three level inverters in transformerless photovoltaic (PV) systems. With the proposed SVPWM the three level space vector (SV) diagram is divided into only six sectors as in conventional two level SV diagram in such a way that only seven SVs are used among all the available SVs of three level inverter. The main features of the proposed SVPWM are that it is simple to implement, less switching losses as compared to conventional SVPWM and most importantly it eliminates the leakage currents in transformerless PV systems. Detailed theoretical analysis of the proposed SVPWM are presented and verified by numerical simulations and experimental results.

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Eliminating Leakage Currents in Neutral Point Clamped Inverters for Photovoltaic Systems

Cited by 214 publications

References 18 publications

A Simplified Space-Vector Modulation Algorithm for Four-Leg NPC Converters

A Simplified Space-Vector Modulation Algorithm for Four-Leg NPC Converters

Single phase cascaded H5 inverter with leakage current elimination for transformerless photovoltaic system

A Simplified SVPWM for Three Level Inverters to Eliminate Leakage Currents in Transformeless Photovoltaic Systems

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