Single-Phase Two-Stage Transformerless Grid-Connected Inverter For Photovoltaic Applications

Kurdkandi, Naser Vosoughi; Marangalu, Milad Ghavipanjeh; Hemmati, Tala; Hosseini, Seyed Hossein; Husev, Oleksandr; Khsokhbar-sadigh, Arash

doi:10.1109/pedstc52094.2021.9405959

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…Recently, large number of multilevel inverters have been presented based on switched-capacitor (SC) circuits. Compared to other inverters, the SC-based MLIs can generate more voltage levels at the output and decrease the number of the needed DC supplies [36][37][38][39]. To obtain a higher number of produced output voltage levels with reduced circuit components, a new type of switched capacitor multilevel inverters have been presented in [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

A new transformer‐less common grounded five‐level grid‐tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

Kurdkandi

Marangalu

Alavi

et al. 2023

IET Renewable Power Gen

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Due to serious Concerns such as air pollution, global warming, and fossil fuels shortcoming, renewable energy sources such as photovoltaic applications are dramatically being integrated into the power generation systems all of the world. Here, a new switched‐capacitor‐based transformer‐less grid‐tied inverter has been proposed. By applying the series–parallel switching technique of the utilized switched‐capacitor module, the voltage boosting capability has been obtained. By implementing common ground technique, high overall efficiency and leakage current elimination capability have been obtained. Since the proposed inverter provides a multi‐level output voltage, the total harmonic distortion of the injected grid current is reduced. The introduced control strategy has been implemented to control both active and reactive powers and generate the switches pulses. Therefore, a high quality and adjusted current is injected to the grid. This inverter requires a single renewable energy source as input DC source. Here, the comprehensive description of the proposed inverter and its performance with design considerations have been presented. The proposed structure has been compared with several similar structures and the obtained results have been investigated. To evaluate the performance of the proposed inverter, a 620 W laboratory prototype is assembled and experimental results are analyzed.

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Section: Introductionmentioning

confidence: 99%

A new transformer‐less common grounded five‐level grid‐tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

Kurdkandi

Marangalu

Alavi

et al. 2023

IET Renewable Power Gen

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“…It is worth noting that besides RES applications, power converters are widely used in numerous modern applications [8][9][10]. Among these converters, multi-level inverters (MLI) are one of the most popular solutions to improve the performance of electric vehicles, renewable energy systems (RES) such as photovoltaic (PV) systems, and other power electronic devices in mediumand high-power applications [11][12][13][14][15]. Compared to other inverter topologies, these inverters benefit from many merits like producing a staircase voltage waveform of the output with lower total harmonic distortion (THD) and higher power quality [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A Seventeen-Level Step-Up Switched-Capacitor-Based Multilevel Inverter With Reduced Charging Current Stress on Capacitors for PV Applications

Haghighian,

Yeh,

Marangalu

et al. 2023

IEEE Access

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Because of serious challenges such as air pollution, global warming, and fossil fuels limitations, renewable energy sources such as photovoltaic (PV) systems are increasingly being integrated into the power systems around the world. In this article, a new gridtied system is proposed for PV applications which consists of an improved flyback DC-DC converter and a new switched-capacitor (SC) based multilevel inverter. Over previously introduced topologies in the same class, the proposed SC-based multilevel inverter has many advantages like reduced number of power switches and DC voltage sources, and also increased number of voltage levels produced at the output. In the proposed structure, one of the most important problems of the capacitive switching inverters, i.e. the occurrence of the impact currents during charging capacitors, is solved by using an inductor with a parallel diode in the capacitive charging current path. This increases the efficiency of the converter and reduces the charging current stress on the capacitors. To validate the performance of the proposed topology, comprehensive experiments and comparisons have been performed and presented. In the experiments, a current controller is used to control the amount of active and reactive power injected to the grid by the proposed grid-tied 17-levels inverter.INDEX TERMS switched capacitor, multilevel inverter, capacitor charging spike, Solar Energy, PV applications.

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“…Higher efficiency, lower cost, proper power density, and meeting some grid code necessities of numerous distributed generation systems are the merits of the transformer-less inverters over the transformer-based systems [1][2][3][4][5][6][7][8]. Voltage fluctuation across the stray capacitor, which emerges between the photovoltaic (PV) panel and the ground, generates the leakage current [9][10][11]. The mentioned injected leakage current produces a noisy dc offset to the grid, so it is essential to control the same magnitude.…”

Section: Introductionmentioning

confidence: 99%

A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current

et al. 2022

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This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications. Additional significant features include-reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability. Moreover, the proposed topology provides full reactive power support to the grid. A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter. Finally, the performance of the proposed inverter is validated by the 770 W laboratory prototype.INDEX TERMS Transformer-less inverter, voltage boosting ability, leakage current limitation, and photovoltaic application.

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Single-Phase Two-Stage Transformerless Grid-Connected Inverter For Photovoltaic Applications

Cited by 17 publications

References 19 publications

A new transformer‐less common grounded five‐level grid‐tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

A new transformer‐less common grounded five‐level grid‐tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

A Seventeen-Level Step-Up Switched-Capacitor-Based Multilevel Inverter With Reduced Charging Current Stress on Capacitors for PV Applications

A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current

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