A Novel Three-Phase Transformerless Cascaded Multilevel Inverter Topology for Grid-connected Solar PV Applications

Chamarthi, Phani Kumar; Durra, Ahmed Al; Saleh, S. A.

doi:10.1109/ias44978.2020.9334766

Cited by 10 publications

(8 citation statements)

References 26 publications

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“…Number of inductors in the proposed inverter and the inverter in Reference 19 is four, while it is six in the inverters in References 15,16,20–22, which is the most among the inverters in Table 2. Number of inductors in the inverters in References 8,10,12,14,17,18,28 is three, while it is two in the inverter in Reference 29, which is the least among the inverters in Table 2. There is no capacitor in the inverters in References 8,15,17,18 because of no output capacitors in the grid‐connected inverters.…”

Section: Resultsmentioning

confidence: 99%

“…The CMLC in the three‐level neutral point clamped (NPC) three‐phase inverter can be reduced by selecting the damping resistor in a modified LCL filter 16 . A cascaded three‐phase grid‐connected inverter was also presented to reduce the CMLC 17 . Nevertheless, there are 18 switches in the inverter in Reference 17, which increases complexity and cost of the inverter.…”

Section: Introductionmentioning

confidence: 99%

“…A cascaded three‐phase grid‐connected inverter was also presented to reduce the CMLC 17 . Nevertheless, there are 18 switches in the inverter in Reference 17, which increases complexity and cost of the inverter.…”

Section: Introductionmentioning

confidence: 99%

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Three‐phase transformerless photovoltaic inverter without common mode leakage current

Yao

Gan

et al. 2022

Engineering Reports

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Since three-phase transformerless (TPT) PV inverters have large common mode leakage current (CMLC), a TPT PV inverter without CMLC is proposed. The proposed inverter is derived from three single-phase half-bridge inverters and a boost converter. Grounds of the PV array and three-phase loads are connected directly, so no CMLC exists in the TPT solar inverter. Operating principle, stability analysis, and loss calculation and example of the proposed three-phase inverter are illustrated in detail. The pulse-width modulation (PWM) and sinusoidal PWM control methods are used in the boost converter and three-phase inverter, respectively. The proposed inverter is a stable system. Finally, simulation and experimental results of a 900-W TPT PV inverter confirm the theoretical analysis. The CMLC in the proposed inverter is only about 0.8 mA, which is mainly caused by the ground line inductance and oscilloscope probe noise.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three‐phase transformerless photovoltaic inverter without common mode leakage current

Yao

Gan

et al. 2022

Engineering Reports

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“…The extracted VE primary grid cells have an irregular geometric structure, forming a one-to-one correspondence with the primary river network of the lake basin. The grid coding form is consistent with the coding scheme of the primary river network of the lake basin, so as to inherit its topological relationship and facilitate the interactive query and retrieval between the MLG and the river network [15][16].…”

Section: Primary Grid Division and Coding Of Vementioning

confidence: 99%

Water Eutrophication based on Multilevel Grid

2020

AJEB

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With the acceleration of the process of lacustrization, the ensuing eutrophication disaster of water body has an increasing impact on people's normal life and production. Lake water body calculation model is an important means to realize the mechanism analysis, risk assessment and loss calculation of eutrophication disaster. Aiming at the problems and difficulties existing in the research of eutrophication of lake water, this paper introduces the advanced idea of multi-level grid(MLG) of spatial information to solve the above problems, discusses the general idea of MLG construction method of eutrophication of water, proposes the related technologies of grid spatial database, and finally builds a series of analysis and decision-making models based on MLG through the parameter collection and calibration test analysis of MLG experimental model, Provide strong data support for the prevention and control of water eutrophication(VE) disasters.

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“…Some topologies were presented with reduction in the number of switches in symmetrical and asymmetrical configuration to achieve more levels in the output waveform 4‐9 . The grid‐connected applications for feeding real power and reactive power via the photovoltaic system in addition to the mitigation of harmonics were discussed using multilevel inverters 10‐13 . To suppress the harmonics produced by the multilevel inverter, many modulation schemes were introduced in the past few years.…”

Section: Introductionmentioning

confidence: 99%

A novel control topology for grid‐integration with modular multilevel inverter

Vanaja¹,

Stonier²,

Moghassemi

2021

Int Trans Electr Energ Syst

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Summary This paper presents a novel control topology for a multilevel inverter with reduced number of power switches for achieving an increased number of levels in output voltage along with improved power quality. The diode clamped multilevel inverter configuration is modified and the gating signals are generated using selective harmonic optimization technique at fundamental frequency using Satin Bower Bird optimization (SBO). It enhances the quality of output voltage waveform with the reduction in total harmonic distortion (THD), less switching power losses, and better efficiency. The inverter is investigated for its competent operation capability on grid‐tied applications. Detailed simulation is conducted and results are presented for various load conditions. To validate the inverter operation, an experimental setup of the modified diode clamped modular inverter (MDCMI) interfacing the grid is presented. The loss analysis is carried out at the inverter and converter segments. Based on the analysis, the proposed control topology demonstrates the reliable and efficient operation of the modular inverter. From the results obtained it is evident that the proposed inverter design suits superlative for the grid applications.

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A Novel Three-Phase Transformerless Cascaded Multilevel Inverter Topology for Grid-connected Solar PV Applications

Cited by 10 publications

References 26 publications

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Three‐phase transformerless photovoltaic inverter without common mode leakage current

Water Eutrophication based on Multilevel Grid

A novel control topology for grid‐integration with modular multilevel inverter

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