Analysis on topology derivation of single-phase transformerless photovoltaic grid-connect inverters

Liao, Zhiling; Cao, Chenchen; Qiu, Diancheng

doi:10.1016/j.ijleo.2018.12.169

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…The specified insulation resistance value is determined by eq. ( 7), considering multiple factors [10][11][12][13][14]17]…”

Section: The Insulation Resistancementioning

confidence: 99%

“…The insulation resistance requirement for 1 m² PV panel, as per DIN EN 61646 and DIN IEC 61215, is a minimum of 40 MΩ. When connected to an inverter, the parallel connection of insulation resistances from multiple photovoltaic panels decreases the overall resistance of the photovoltaic system to Earth [12][13][14][15][16][17]…”

Section: The Insulation Resistancementioning

confidence: 99%

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Enquête De Performance d'UN Onduleur Pv Monophasé Sans Transformateur Connecté À Un Réseau Basse Tension

BOULAHCHICHE,

HADJ ARAB,

HADDAD

et al. 2024

RRST-EE

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Due to their high efficiency and reduced size and weight compared to transformer-based inverters, transformerless single-phase inverters are the most widely used in photovoltaic systems connected to the low-voltage grid. Unfortunately, the absence of galvanic isolation leads to ground faults caused by capacitive leakage current flow and deterioration of the inverter's insulation resistance on the dc side. This paper examines the performance of the three transformerless single-phase inverters of the first grid-connected photovoltaic system in Algeria under adverse weather conditions, such as rain, as there is no galvanic isolation between the dc and ac side of the inverter, making operation of the photovoltaic system more difficult. The flow of capacitive leakage current from the earth to the inverter output is one of the two phenomena, resulting in protection devices being triggered involuntarily. The second phenomenon is system shutdown due to a decrease in the inverter's insulation resistance at the input. The VDE 126-1-1 standard integrated into the inverter, which defines the safety requirements for grid-connected photovoltaic systems, is used in this article to manage and analyze both phenomena.

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“…The specified insulation resistance value is determined by eq. ( 7), considering multiple factors [10][11][12][13][14]17]…”

Section: The Insulation Resistancementioning

confidence: 99%

Section: The Insulation Resistancementioning

confidence: 99%

Enquête De Performance d'UN Onduleur Pv Monophasé Sans Transformateur Connecté À Un Réseau Basse Tension

BOULAHCHICHE,

HADJ ARAB,

HADDAD

et al. 2024

RRST-EE

View full text Add to dashboard Cite

show abstract

“…Each switch consists of an Insulated Gate Bipolar Transistor (IGBT) and an anti-parallel diode, so the conduction losses of the switches are composed of these two parts. When the switch turns on when the IGBT is closed, the on-state current I C , flows through the IGBT, creating a saturated voltage drop V CE(SAT ) , the conduction loss is shown in Equation (10),…”

Section: Comparison With Heric Topologymentioning

confidence: 99%

“…During the freewheeling stage of the inverter switching cycle, the output side of the photovoltaic cells and the grid side are decoupled to prevent the formation of a common-mode loop. The most representative topology structures for this purpose are the H5, H6, and HERIC topologies (8)(9)(10) . These topologies change the transmission path of the freewheeling path by increasing the number of switch devices, thereby suppressing leakage current.…”

Section: Introductionmentioning

confidence: 99%

Development of Improved Low-leakage Current H6 Single-Phase Full-Bridge Inverter Topology

Begum,

Upendar

2024

IJST

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Objective: To minimize leakage current in non-isolated photovoltaic grid connected inverters. Methods: The circuit design integrates extra switches and modifies the switch drive signals at the midpoint of the DC bus voltage, altering the common-mode current path. Findings: The proposed topology exhibits significant potential for widespread adoption, finding practical applications in diverse industrial settings as well as in residential use. Novelty: The suggested method implies that the topology presents distinctive or beneficial characteristics in contrast to current solutions, rendering it especially promising for a range of industrial and residential applications. This novelty may arise from enhancements in efficiency, cost-effectiveness, scalability, versatility, or other favorable attributes that distinguish it from traditional approaches. Moreover, Simulation outcomes distinctly demonstrate a noteworthy decrease in leakage current within the refined topology when contrasted with both the H5 topology and the High Efficient and Reliable Inverter Concept (HERIC) topology. This compelling evidence affirms the effectiveness of the proposed configuration in proficiently mitigating leakage current. Keywords: Photovoltaic, Common Mode Voltage, Leakage Current, Grid Connected Inverter

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“…This module is often applied in the DC application systems were observed according to [7][8][9], where their utilization in DC loads through the DC-DC converter. PV module is also commonly used in the AC application systems based on [10][11][12][13], where observation was conducted on their application in the pulse-width modulations (PWM) transformerless photovoltaic inverter (TPVI) system. These inverters were operated directly by a PV module, as the main DC energy source.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Solar Irradiance on the Performance of 50 Hz Photovoltaic Wireless Power Transfer System

et al. 2023

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A wireless power transfer (WPT) system transfers an alternating current (AC) power from a TC (transmitter coil) to a RC (receiver coil), using an electromagnetic field concept. Several previous reports on WPT systems were able to transmit this power, although their AC frequencies were high in some kilohertz or megahertz (kHz or MHz). These frequencies were unable to be applied directly on the AC loads or only administered to the direct current (DC) energy after rectification through a rectifier circuit. In the receiver phase, the AC power was also very low, due to the minimum voltage and current on the RC. Therefore, this study aims to determine the effects of temperature and solar irradiance on the performance of the 50 Hz photovoltaic wireless power transfer (PVWPT) system. This system is constructed by some PV modules in series connection, to achieve a required DC voltage level on the DC-DC converter and receiver phase. It also converts DC to AC voltages on the TC (transmitter coil) of an H-bridge inverter, with a receiver circuit and a magnetic relay coil positioned between the TC and RC (transmitter and receiver coil). The results showed that solar irradiance and temperature affected the performances of the PV module and PVWPT system. This indicated that higher solar irradiance increased the performance of the PVWPT system, whose maximum efficiency was achieved by positioning the magnetic relay coil between the TC and RC.

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Analysis on topology derivation of single-phase transformerless photovoltaic grid-connect inverters

Cited by 6 publications

References 12 publications

Enquête De Performance d'UN Onduleur Pv Monophasé Sans Transformateur Connecté À Un Réseau Basse Tension

Enquête De Performance d'UN Onduleur Pv Monophasé Sans Transformateur Connecté À Un Réseau Basse Tension

Development of Improved Low-leakage Current H6 Single-Phase Full-Bridge Inverter Topology

Effect of Temperature and Solar Irradiance on the Performance of 50 Hz Photovoltaic Wireless Power Transfer System

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