Novel Step-Up Transformerless Inverter Topology for 1-Φ Grid-Connected Photovoltaic System

Chamarthi, Phani Kumar; Moursi, Mohamed Shawky El; Khadkikar, Vinod; Hosani, Khalifa Al; EL-Fouly, Tarek H. M.

doi:10.1109/tia.2021.3066141

Cited by 23 publications

(10 citation statements)

References 26 publications

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“…switches and diodes) and power components. The total seven numbers of power devices are used in the proposed HVBTI, while the total power devices count of high gain transformerless inverters in [10], [11], [15]- [20], [26]- [30] varies from 3∼8, as shown in Table III. However, a limited number of high gain inverters from these topologies support the reactive power as per the IEEE 1547-2018 standards.…”

Section: Comparative Performance Analysismentioning

confidence: 99%

“…The transformerless inverters in [10], [11], [15], [16] have a gain in the output voltage of m i . Hence, these inverters can be used in such applications where the output voltage is required to step down.…”

Section: Comparative Performance Analysismentioning

confidence: 99%

“…system and also to a reduction in efficiency [7]. To overcome these problems, several researchers have developed transformerless inverter topologies for PV applications [8]- [10].…”

mentioning

confidence: 99%

“…However, the H5 inverter cannot supply reactive power, the H6 inverters have higher control complexities, and HERIC inverters add an additional filter that increases the size of the system. In [10] and [15], transformerless inverter topologies are introduced to suppress the leakage currents completely. In this inverter topology, the −ve terminal of PV is shorted to neutral of the power grid, effectively suppressing parasitic currents.…”

mentioning

confidence: 99%

“…A flying capacitorbased voltage boosting transformerless inverter topology in [11] boosts its output voltage twice the input voltage, with an issue of DC offset current injection into the power grid due to asymmetry in the operation of the inverter. In [16], a charge pump circuit based transformerless inverter is introduced to Transformerless inverters [8], [9], [10], [12], [13], [14], [15] High voltage gain [11], [16], [17], [18], [26], [27] Capability of reactive power [19], [20], Proposed HVBTI suppress the leakage currents. However, it cannot provide a high gain in the output voltage and also suffers from high current ripple at the input due to the absence of the input inductor.…”

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confidence: 99%

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Novel 1-$\varphi$ High-Voltage Boosting Transformerless Inverter Topology With Optimal Power Components and Negligible Leakage Currents

Chamarthi

Muduli

Moursi

et al. 2023

IEEE Trans. on Ind. Applicat.

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Inverter topologies for integrating a rooftop photovoltaic (PV) unit into a microgrid are becoming increasingly complex. This paper proposes a high-voltage boosting transformerless inverter (HVBTI) topology for enhancing such applications. The coupled inductor-based high voltage gain feature of the HVBTI configuration allows power to be delivered into the grid from a lower voltage PV source without using higher duties. In addition, HVBTI suppresses leakage current as the common connection shared between the −ve terminal of the PV source and the grid neutral point. In comparison to existing topologies, the HVBTI topology uses a compact pulse width modulation strategy to control only six controllable switching devices. Again, using lower-rated switching devices is more cost-effective while increasing reliability and efficiency. In a laboratory prototype of a 1 kVA grid integrated system, the proposed HVBTI configuration is validated, and the maximum efficiency of the HVBTI is estimated at approximately 95%.

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Section: Comparative Performance Analysismentioning

confidence: 99%

Section: Comparative Performance Analysismentioning

confidence: 99%

“…system and also to a reduction in efficiency [7]. To overcome these problems, several researchers have developed transformerless inverter topologies for PV applications [8]- [10].…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Novel 1-$\varphi$ High-Voltage Boosting Transformerless Inverter Topology With Optimal Power Components and Negligible Leakage Currents

Chamarthi

Muduli

Moursi

et al. 2023

IEEE Trans. on Ind. Applicat.

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An integrated common ground‐based grid‐connected current‐fed switched inverter

Ravitheja,

Sahoo,

Thirumala

2024

Circuit Theory & Apps

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A current‐fed switched inverter and its derivatives are gaining more attention in solar PV grid‐connected applications. In these inverters, the absence of galvanic isolation generates the leakage current, leading to the injection of harmonics and the degradation of solar PV panel life span. This paper proposes an integrated common ground‐based grid‐connected current‐fed switched inverter. The common ground between the input DC source and output AC grid eliminates the leakage current and makes the inverter immune to high‐frequency common‐mode voltage variations. It utilizes the shoot‐through state to boost the input DC voltage and obtain the rated AC output voltage. Moreover, as compared to the contemporary common ground‐based inverter topologies, the number of passive reactive elements and active switches is less. Thereby, the size, cost of the system, and associated power loss are reduced. The proposed inverter's continuous input current and buck–boost nature make it suitable for applications like solar PV systems. The steady‐state analysis of the proposed inverter is validated using the MATLAB Simulink tool, and furthermore, the simulation results during grid‐tied mode have been cross‐verified with the help of real‐time simulator OPAL‐RT. Further, the power loss and thermal loss analysis are carried out using the PLECS software. Finally, the performance of the inverter and simulation results are verified with the experimental results.

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A five‐level single‐phase transformerless inverter with lesser component count for PV applications

Neti,

Singh,

Anand

2024

Circuit Theory & Apps

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SummaryA transformerless inverter with reactive power capability has gained popularity in grid‐tied photovoltaic applications. This brief report introduces a five‐level transformerless inverter structure based on a switched capacitor (SC), which requires seven switches as semiconductor elements, one capacitor, a small inductor element to limit the high inrush current, and an input DC source in the power circuit. Notably, fewer power components result in lower losses in the inverter system. In order to fulfill the reactive power capability and self‐balanced SCs, a level‐shifted pulse width modulation (LSPWM) scheme is adopted. A simple closed‐loop controller is used for the voltage‐balancing approach to maintain the voltage and grid‐connected operation of the presented five‐level inverter. SC functional operation, modulation method, and voltage self‐balancing are thoroughly explored. In‐depth comparisons are made between the proposed and five‐level state‐of‐the‐art MLIs for PV systems. Finally, the performance of the inverter is verified experimentally in the laboratory environment for a single‐phase 1 kW system. The voltage and current stress are analyzed. The experiment is carried out for the change in modulation index, input, and loading condition. The experimental results suggest the inverter's adequate performance with an efficiency of the inverter is 97.3%.

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Novel Step-Up Transformerless Inverter Topology for 1-Φ Grid-Connected Photovoltaic System

Cited by 23 publications

References 26 publications

Novel 1-$\varphi$ High-Voltage Boosting Transformerless Inverter Topology With Optimal Power Components and Negligible Leakage Currents

Novel 1-$\varphi$ High-Voltage Boosting Transformerless Inverter Topology With Optimal Power Components and Negligible Leakage Currents

An integrated common ground‐based grid‐connected current‐fed switched inverter

A five‐level single‐phase transformerless inverter with lesser component count for PV applications

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