An Improved Multilevel Inverter for Single-Phase Transformerless PV System

Faraji, Faramarz; Birjandi, Ali Akbar Motie; Gazafrudi, Sayed Mohammad Mousavi; Zhang, Jianhua; Wang, Baocheng; Guo, Xiaoqiang

doi:10.1109/tec.2020.3006552

Cited by 25 publications

(4 citation statements)

References 32 publications

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“…The advantages and disadvantages of the NPC topology in comparison to the commonly recognized topologies, namely the cascaded H-Bridge (CHB) inverter and the flying capacitor (FC) inverter, are presented in Table 1. While there is a continued pursuit of enhanced efficiency in transformer-less PV power converters, the growing utilization of these converters in several conversion systems has revived concerns regarding one of the principal challenges inherent to these systems which is the common mode voltage (CMV) issue [22][23][24][25]. Substantial common-mode leakage currents can be generated due to the high switching frequencies of MLI power devices.…”

Section: Topology Schematic Representation Features Limitationsmentioning

confidence: 99%

A Comprehensive Review on Space Vector Based-PWM Techniques for Common Mode Voltage Mitigation in Photovoltaic Multi-Level Inverters

Ben Mahmoud,

Khedher

2024

Energies

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Nowadays, transformer-less photovoltaic (PV) multi-level inverters (MLIs) are commonly employed in both industrial and residential settings. This structure has attracted increased attention due to its unique advantages, such as higher efficiency, lower cost and size, better waveform quality, and inherent fault tolerance. However, due to the removal of the transformer, the common mode voltage (CMV) becomes one of the crucial issues in transformer-less PV MLIs. The high-frequency variation in CMV results in a leakage current that deteriorates the line current quality, increases the PV power system losses, leads to severe electromagnetic emissions (EMI), reduces the PV array lifespan, and causes personal safety problems. In this regard, this paper presents a review of the existing and recent research on modulation techniques based on space vector pulse width modulation (SVPWMs) that overcome this issue in transformer-less three-level NPC-MLIs (3L-NPC-MLIs). The reduced CMV-SVPWM (RCMV-SVPWM) can be mainly categorized as an RCMV-SVPWM based on the vector type, based on virtual vectors, and based on the two-level SVPWM (2L-SVPWM). Their features and their limitations in terms of several main criteria are discussed. In the final section of this paper, some challenges and future trends for this research area are projected.

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Section: Topology Schematic Representation Features Limitationsmentioning

confidence: 99%

A Comprehensive Review on Space Vector Based-PWM Techniques for Common Mode Voltage Mitigation in Photovoltaic Multi-Level Inverters

Ben Mahmoud,

Khedher

2024

Energies

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“…The literature reports several methods to deal with CMV that can be classified as follows: specific design of the pulse width modulation (PWM) strategy, virtual-ground connection, control techniques, commonground connection, passive filtering, and redesign of the topology [6]- [9]. Among these, PWM strategies, passive filtering, common-ground connection and control methods result in attractive solutions because they avoid the modification of the converter structure reducing the implementation cost [10].…”

Section: Introductionmentioning

confidence: 99%

A 5LCHB Inverter for PV Transformerless Applications With Reduced Leakage Ground Current

et al. 2022

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The transformerless inverters for photovoltaic systems are widely used as it features low cost, volume, and weight. Thus, in recent years, its study has been of great interest to the research community. In this paper a transformerless cascade multilevel inverter for photovoltaic applications with leakage ground current compensation capability is presented. The proposed solution involves a second-order LC output filter with a particular connection, which is referred to as the DC-link-tied LC output filter. This solution is aimed to deal with the leakage-ground current issue, regardless of the considered PWM strategy. The mathematical model of the system involving such a particular LC output passive filter configuration is presented, out of which, both the differential-mode and the common-mode models are obtained. These models are used to explain the leakage-ground current improvement of the proposed DC-link-tied LC output filter. This hardware solution is evaluated under different modulation schemes to contrast the converter output response and the leakage-ground current performance. Finally, simulation and experimental results are performed using a 1 kW academic prototype to assess the performance of the proposed DC-link-tied LC output filter used in a transformerless inverter application.INDEX TERMS leakage ground current, passive filters, PWM strategy, transformerless photovoltaic systems.

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“…Although the harmonics issue is an enormous challenge in this technology, this causes harmful effects on some appliances. Within harmonics, the highly hazardous to the system are lower order harmonics since they create pulsation torque in electric drives, diminish the efficiency, and take down the system lifetime [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Artificial Neural Network and Newton Raphson (ANN-NR) Algorithm Based Selective Harmonic Elimination in Cascaded Multilevel Inverter for PV Applications

2021

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In this article, a hybrid Artificial Neural Network -Newton Raphson (ANN-NR) is introduced to mitigate the undesired lower-order harmonic content in the cascaded H-Bridge multilevel inverter for solar photovoltaic (PV). Harmonics are extracted by the excellent choice of opting switching angles by exploiting the Selective Harmonic Elimination (SHE) PWM technique accompanying a unified algorithm in order to optimize and reduce the Total Harmonic Distortion (THD). ANN is trained with optimum switching angles, and the estimates generated by the ANN are the initial guess for NR. In this study, the CHB-MLI is combined with a traditional boost converter, it boosts the PV voltage to a superior dc-link voltage Perturb and Observe (P&O) based Maximum Power Point Tracking (MPPT) algorithm is used for getting a stable output and efficient operation of solar PV. The proposed system is proved over an eleven-level H-bridge inverter, the work is carried out in MATLAB/Simulink environment, and the respective results are confirmed that the proposed technique is efficient, and offers an actual firing angles with a few iterations results in a better capability of confronting local optima values. The suggested algorithm is justified by the experimental development of eleven-level cascaded H-bridge inverter.

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An Improved Multilevel Inverter for Single-Phase Transformerless PV System

Cited by 25 publications

References 32 publications

A Comprehensive Review on Space Vector Based-PWM Techniques for Common Mode Voltage Mitigation in Photovoltaic Multi-Level Inverters

A Comprehensive Review on Space Vector Based-PWM Techniques for Common Mode Voltage Mitigation in Photovoltaic Multi-Level Inverters

A 5LCHB Inverter for PV Transformerless Applications With Reduced Leakage Ground Current

Artificial Neural Network and Newton Raphson (ANN-NR) Algorithm Based Selective Harmonic Elimination in Cascaded Multilevel Inverter for PV Applications

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