Experimental Comparison of Two-Level Full-SiC and Three-Level Si–SiC Quasi-Z-Source Inverters for PV Applications

Stepenko, Serhii; Husev, Oleksandr; Vinnikov, Dmitri; Roncero‐Clemente, Carlos; Pimentel, Sérgio Pires; Santasheva, Elena

doi:10.3390/en12132509

Cited by 21 publications

(17 citation statements)

References 44 publications

(39 reference statements)

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“…According to the study, a full-SiC 2-level qZSI solution has a clear advantage over the 3-level NPC qZSI solution with Si MOSFETs, in terms of higher efficiency, along with the lower volume of the heatsink, while the volume of passive elements remains the same. The interleaved 2-level qZSI for a single-phase PV application and the control approaches, including different modulation techniques, are discussed in detail in [23][24][25][26][27]. Our work is devoted to the feasibility study of the interleaving approach in terms of size, efficiency and the overall cost of the converter.…”

Section: Description Of a Case Study System With A Quasi-z-source Invmentioning

confidence: 99%

“…These numbers are sufficient to yield an MPPT efficiency of 99%, which is the industrial standard. The 2-level qZSI is described in [22] as a three-phase PV inverter, while the 2-level solution is compared with the 3-level NPC for a single-phase application in [23]. According to the study, a full-SiC 2-level qZSI solution has a clear advantage over the 3-level NPC qZSI solution with Si MOSFETs, in terms of higher efficiency, along with the lower volume of the heatsink, while the volume of passive elements remains the same.…”

Section: Description Of a Case Study System With A Quasi-z-source Invmentioning

confidence: 99%

“…At the same time, the most important outcomes are found in the experimental study. A detailed experimental study of a single qZSI is presented in [23]. In the experimental study, we focused on the interleaved qZSI and its comparison with the single 2-level qZSI.…”

Section: Simulation and Experimental Studymentioning

confidence: 99%

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Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

et al. 2020

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This paper presents a comprehensive feasibility study of an interleaving approach for a quasi-Z-source inverter. The state-of-the-art approach revealed that an interleaving approach is often used to improve the efficiency and power density that can overcome the problem of oversized passive elements of quasi-Z-source-based converters. The focus is on the application of the interleaving approach in terms of the comparison of several important parameters of a quasi-Z-source inverter. Our analysis includes losses, capacitor and inductor sizes, as well as semiconductor costs. The theoretical comparison is based on the quasi-Z-source inverter model and the losses model. Simulation and experimental verification of theoretical statements are provided. It was found that a 40% reduction of inductor volume, along with 15–20% of efficiency improvements, are achievable. The results are discussed in the conclusion.

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Section: Description Of a Case Study System With A Quasi-z-source Invmentioning

confidence: 99%

Section: Description Of a Case Study System With A Quasi-z-source Invmentioning

confidence: 99%

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Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

et al. 2020

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“…There are only a few studies on dynamics of the complete system [6], [17] − [22]. Most of them focus on the assessment of AC network impedance performance on the DC side [18], [20], [21]. The impact of AC grid on qZSI PV power generation system dynamics is investigated in [6], [17], [19].…”

Section: Introductionmentioning

confidence: 99%

Frequency Domain Stability Assessment of Photovoltaic Power Generation Systems with Quasi-Z-Source Inverters

Sainz¹,

Monjo²

2021

REPQJ

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Photovoltaic power generation systems are one of the main renewable power sources, and quasi-Z-source inverters are becoming powerful devices to integrate these systems in AC grids. However, stability issues due to the damping behaviour of converters must be considered. There are several studies in this direction but instability concerns are not completely solved yet. This paper contributes with a procedure for the stability assessment of photovoltaic power generation systems with quasiZ-source inverters in the frequency domain. The study is based on the small-signal averaged model of the system expressed in the s-domain and the stability criterion derived from the frequency characteristics of the state-space matrix. The influence of the photovoltaic power generation system operating point on stability is studied by the proposed procedure. Eigenvalue analysis and PSCAD/EMTDC simulations are also performed to validate the obtained results.

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“…In [13][14][15][16][17][18] a novel type of impedance network called quasi-Z-source (qZS) was proposed to overcome the limitations of the ZS network. In this topology, the input current is continuous and voltage stress on capacitors is reduced, significantly.…”

Section: Introductionmentioning

confidence: 99%

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

Tran

et al. 2020

Energies

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In recent years, the three-level T-Type inverter has been considered the best choice for many low and medium power applications. Nevertheless, this topology is known as a buck converter. Therefore, in this paper, a new topology incorporating the dc-link type quasi-switched boost network with the traditional three-level T-type inverter is proposed to overcome the limit of traditional three-level T-Type inverter. The space vector pulse width modulation scheme is considered to control this topology, which provides some benefits such as enhancing modulation index and reducing the magnitude of common-mode voltage. For this scheme, the zero, medium, and large vectors are utilized to generate the output voltage. The shoot-through state which is adopted by turning on all power switches of inverter leg is inserted into zero vector to boost the dc-link voltage. As a result, there is no distortion at the output waveform. The control signal of intermediate network power switches is also detailed to improve the boost factor and voltage gain. As a result, the voltage stress on power devices like capacitors, diodes, and switches is decreased significantly. To demonstrate the outstanding of proposed structure and its control strategy, some comparisons between the proposed method and other ones are performed. Simulation and experimental prototype results are conducted to verify the accuracy of the theory and effectiveness of the inverter.

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Experimental Comparison of Two-Level Full-SiC and Three-Level Si–SiC Quasi-Z-Source Inverters for PV Applications

Cited by 21 publications

References 44 publications

Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

Feasibility Study of Interleaving Approach for Quasi-Z-Source Inverter

Frequency Domain Stability Assessment of Photovoltaic Power Generation Systems with Quasi-Z-Source Inverters

A Three-Level DC-Link Quasi-Switch Boost T-Type Inverter with Voltage Stress Reduction

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