Step-up Transformerless Seven-level DC-AC Hybrid Topology for Interconnection of Renewable-based DC Sources to Microgrids

Rodríguez, Juan; Moreno-Goytia, Edgar L.; Venegas-Rebollar, Vicente; Ugalde, L. E.; Salgado-Herrera, Nadia María

doi:10.1080/15325008.2014.949910

Cited by 3 publications

(7 citation statements)

References 20 publications

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“…The output voltage value is identical to the summation of the voltage of C O1 , C O2 , and C O3 , as presented by (19).…”

Section: Components Voltage Stress Current Stressmentioning

confidence: 99%

“…Similar to the steps taken to find the voltage of capacitor C O1 (25)-( 27), the following equation can be found for capacitors C O2 and C O3 . According to (19), the output voltage is equal to the sum of the voltage of three output capacitors. Therefore, the output voltage and efficiency are determined by (29) and (30).…”

Section: Conduction Losses and Efficiencymentioning

confidence: 99%

“…By these methods, it is possible to design high-power converters with low losses and high efficiency. Yan et al 19 proposed a novel step-up converter, which is placed in non-isolated group of converters. Bidirectional power flow, interleaved operation, and high gain are the main features of the proposed topology.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A new high‐efficiency interleaved step‐up converter with zero‐voltage switching, zero‐current switching, and common‐ground features for stand‐alone electric vehicle charging stations

Eshkevari

Sadighi

Salemnia

et al. 2021

Circuit Theory & Apps

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A new step-up dc-dc converter with the interleaved operation is proposed. This converter is equipped with a novel active clamp circuit that provides zero-voltage switching (ZVS) operation for power switches and zero-current switching (ZCS) for diodes. High-efficiency, interleaved structure, common-ground, and continuous input current are other features of this topology. Also, the presented topology provides higher boost factors due to using coupled inductors. Therefore, this topology is useful for connecting to renewable energy resources like photovoltaic panels and fuel cells. Due to its soft-switching operation and high efficiency, this converter can be designed for high-power applications. As a result, this converter can be utilized in stand-alone electric vehicle charging stations. Simulation and experimental results are presented to evaluate this topology. For this purpose, a 48-V/380-V/500-W prototype has been built. Results confirm the above claims.

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“…The output voltage value is identical to the summation of the voltage of C O1 , C O2 , and C O3 , as presented by (19).…”

Section: Components Voltage Stress Current Stressmentioning

confidence: 99%

Section: Conduction Losses and Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

A new high‐efficiency interleaved step‐up converter with zero‐voltage switching, zero‐current switching, and common‐ground features for stand‐alone electric vehicle charging stations

Eshkevari

Sadighi

Salemnia

et al. 2021

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…Conventionally, full bridge inverters were optimized with voltage divider capacitor, 1 whereas new topologies were proposed for obtaining higher efficiency with the reduced number of switches. 2 Researchers have also provided an extensive overview of transformerless inverter topologies. [3][4][5] In the research presented by Freddy et al 6 H bridge was modified with zero states to reduce the losses.…”

Section: Introductionmentioning

confidence: 99%

“…Considering the solar power generation, inverters play a significant role in converting direct current (DC) power generated from the PV systems to alternating current (AC) form for utilization with high efficiency. Conventionally, full bridge inverters were optimized with voltage divider capacitor, 1 whereas new topologies were proposed for obtaining higher efficiency with the reduced number of switches 2 . Researchers have also provided an extensive overview of transformerless inverter topologies 3‐5 .…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of stand‐alone transformerless inverters

Khan

Haque

Kurukuru

2019

Int Trans Electr Energ Syst

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Summary There is a significant improvement in the efficiency and reliability of photovoltaic inverter by using transformerless topologies. But, the issues related to voltage regulation and total harmonic distortion (THD) needs to be addressed deeply. This paper aims to study the performance parameters like voltage regulation, efficiency, and THD of highly efficient transformerless inverters. In addition to this, a modified topology is proposed, which exhibits improved performance while operating with controllers, such as fuzzy and neuro‐fuzzy, are implemented. Simulation is performed using MATLAB. A prototype of the proposed transformerless inverter is also developed in the lab along with the modified control. The proposed topology isolates the photovoltaic (PV) array form the load during the zero‐voltage state. When operated in stand‐alone mode with an intelligent controller, the proposed topology provides benefits with low THD, less power loss, improved voltage regulation, enhanced performance, and efficiency. The result shows an error of 1% in the nominal value of output voltage under varying load and ambient conditions. Settling time is observed to be less than 0.1 seconds for both simulation and prototype. THD is observed at 1.9% for simulation and 2.1% for prototype results, which is better than the previous work.

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A single‐loop and current‐sensorless control for on‐grid seven‐level photovoltaic microinverter

Rodríguez

Mejía-Ruiz

Paternina

et al. 2022

IET Power Electronics

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This paper proposes a single‐phase transformerless photovoltaic (PV) microinverter for low and medium‐voltage applications. The proposed approach comprises a suitable combination of multilevel boost/buck and H‐bridge topologies with a current‐sensorless control scheme, where the system controller only needs a straightforward‐to‐implement control loop to reach the desired attributes in solar PV conversion systems. Compared with other microinverters, this proposal significantly reduces the number of hardware components and required software resources, considerably attaining industrial and production advantages; guaranteeing: (i) a high DC elevation factor; (ii) an extraction of maximum power from solar PV panels; (iii) a multilevel output voltage; (iv) a low total harmonic distortion; and (v) a power factor close to unity. The multilevel microinverter's feasibility and effectiveness are assessed by a comprehensive mathematical model, whose simulation results are evaluated using MATLAB‐Simulink, and the experimental results are validated by means of an on‐grid low‐scale prototype, generating a power capacity of 1.5 kW.

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Step-up Transformerless Seven-level DC-AC Hybrid Topology for Interconnection of Renewable-based DC Sources to Microgrids

Cited by 3 publications

References 20 publications

A new high‐efficiency interleaved step‐up converter with zero‐voltage switching, zero‐current switching, and common‐ground features for stand‐alone electric vehicle charging stations

A new high‐efficiency interleaved step‐up converter with zero‐voltage switching, zero‐current switching, and common‐ground features for stand‐alone electric vehicle charging stations

Performance assessment of stand‐alone transformerless inverters

A single‐loop and current‐sensorless control for on‐grid seven‐level photovoltaic microinverter

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