Mitigation of Leakage-Ground Currents in Transformerless Grid-Tied Inverters via Virtual-Ground Connection

Escobar, G.; Martinez‐Rodriguez, Panfilo R.; Iturriaga‐Medina, Samuel; Mayo-Maldonado, Jonathan C.; Lopez-Sarabia, Jorge; Micheloud, O.

doi:10.1109/jestpe.2019.2933399

Cited by 20 publications

(12 citation statements)

References 20 publications

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“…Then, different configurations of leakagecurrent blocking switches are added to separate AC and DC side during the freewheeling period [25], [18]. The virtualground connection was introduced by [26] and [27] for PV application; however, the proposed topology can be extended in hybrid MGs utilization as well. In this study, the neutral point of the LCL filter is connected to the neutral point of the DC-link capacitor and the neutral point of the three-phase three-level full-bridge inverter.…”

Section: Topologiesmentioning

confidence: 99%

“…This approach does not change the CM current; however, providing an alternative predominant capacitive path for the CM current decreases the high-frequency CM current flowing by the ground path. The main demerits of this method are the safety issue and the total power-loss increase because the virtual ground path consists of switches [27]. CM solutions are shown with a dashed line in Fig.…”

Section: Topologiesmentioning

confidence: 99%

“…However, few studies have addressed the frequency noise and power quality in the rectifier mode of BIC on the DC side. Decoupling the AC side from the DC side by the two-stage BIC is an efficient way to decline the effects of EMI [229]; however, few studies consider the effects of AC side power change on the DC-link ripple and the harmonics produced [27]. This issue originates from an essential topic, i.e., lack of DC power quality regulations.…”

Section: F CM Current Controlmentioning

confidence: 99%

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Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

et al. 2021

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This work analyzes interlinking converter control in hybrid AC/DC microgrids. The paper addresses the state-of-the-art general hybrid microgrid structure. The key power electronics topologies are used as bidirectional interface converters in the AC and DC parts. Different control structures of hybrid microgrids are categorized, followed by the classification of the main control functions, their control strategies, and the control techniques and a summary of their positive and negative aspects and applications. Control functions, their strategies and techniques are classified in the interlinking-converter based. Finally, overall control objectives, time-scaled control structures, and their strategies are outlined. The prospects, main challenges, research gaps, and the trend of the hybrid microgrid structure and control are reviewed and summarized in the conclusions.

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Section: Topologiesmentioning

confidence: 99%

Section: Topologiesmentioning

confidence: 99%

Section: F CM Current Controlmentioning

confidence: 99%

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Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

et al. 2021

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“…However, galvanic isolation increases the weight, cost and decreases the overall efficiency of the SECS, thereby, researchers have presented transformerless grid interfaced SECS in [10,11]. Researchers have identified the existing possible parasitic capacitance in the SECS [3,[8][9][10][11]. There are typically three different capacitances, 1) solar film to the glass, 2) solar film to roof surface area and 3) solar film to the grounded support frame.…”

Section: Introductionmentioning

confidence: 99%

“…The typical value (per kilowatt) of the stray capacitance is 80 and 130 nF for crystalline silicon cells and thin-film modules, respectively. For accurate estimation of the stray capacitance for the solar PV array system, the detailed calculation process is described in [3,5,[8][9][10][11]. The effects and consequences with variation in stray capacitance on the SECS, are analysed in [11].…”

Section: Introductionmentioning

confidence: 99%

Power quality improvement using three‐phase transformerless grid interfaced SECS enabling leakage current suppression

Shah

Singh

2021

IET Power Electronics

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This paper presents a harmonic compensation strategy for a 3-ϕ grid-tied solar energy conversion system with leakage current attenuation feature. As parasitic capacitance exists between the solar photovoltaic panels with the ground, the deviation in common-mode voltage compels the probable safety hazards such as electromagnetic interference and harmonics injection in the grid currents. Additionally, the power quality indices of the grid, are exacerbated with the coupling of the non-linear load. Owing to these issues, a generalized integrator based approach is introduced to ensure the harmonics suppression, power factor correction, leakage current alleviation. Additionally, the grid current distortion limits are ensured within limits in order to comply with the IEEE std. 519. The presented algorithm ensures a robust operation with respect to various anomalies in the grid voltages. Simulation results show the satisfactory response of the harmonics controller even under abnormal operating scenarios including the symmetrical/unsymmetrical faults in the grid side network. In comparison with the traditional algorithms, the harmonic controller suppresses the leakage current and harmonics within restricted limits despite the abnormal conditions. Real-time simulator results demonstrate the performance of the controller under distinct operating conditions such as load unbalancing, distorted grid voltages, etc.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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A control design for a photovoltaic transformerless HB-NPC inverter with leakage-ground current reduction

Iturriaga‐Medina

Martinez‐Rodriguez

Escobar

et al. 2023

International Journal of Electrical Power & Energy Systems

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Mitigation of Leakage-Ground Currents in Transformerless Grid-Tied Inverters via Virtual-Ground Connection

Cited by 20 publications

References 20 publications

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

Power quality improvement using three‐phase transformerless grid interfaced SECS enabling leakage current suppression

A control design for a photovoltaic transformerless HB-NPC inverter with leakage-ground current reduction

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