A Hybrid Resonant Converter Utilizing a Bidirectional GaN AC Switch for High-Efficiency PV Applications

LaBella, Thomas; Lai, Jih-Sheng

doi:10.1109/tia.2014.2312818

Cited by 77 publications

(27 citation statements)

References 26 publications

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“…The main task of the inductors in the qZS-network is to limit the current ripple through the switch during the shoot-through states. Choosing an acceptable peak to peak current ripple r C the required inductance can be estimated by (6) Where Lis the inductance of each inductor in the qZS-network, V C1 is the operating dc voltage of the capacitor C 1 and r C is the desired peak to peak current ripple through the inductor.…”

Section: Operation and Basic Implemention Of Srmentioning

confidence: 99%

Analysis, Design and Investigation on a New Single-Phase Switched Quasi Z-Source Inverter for Photovoltaic Application

Bharatiraja

Sanjeevikumar

Mahes

et al. 2017

IJPEDS

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This paper addresses the approach to improve the efficiency of the quasi Z-source inverter. In order to increase the efficiency the reduction of conduction losses is one way to approach. Sequentially to decrease the conduction losses in the quasi z-source inverter the replacement of diode is replacing with switches is proposed which is also called as synchronous rectification. The paper represents basics of the approach, analysis and comparison of the power losses of the traditional and proposed designs of the grid connected PV-system with quasi z-source inverter system. The proposed approach validated on the computer simulations in the MATLAB environment. Keyword:Inverter Photovoltaic application Quasi Z-source Copyright © 2017 Institute of Advanced Engineering and Science.All rights reserved.Corresponding Author:C. Bharatiraja, School Electrical and Electronics Engineering, SRM University, Chennai, India. Email: bharatiraja@gmail.com INTRODUCTIONThe quasi z-source inverters (q-ZSI) are drawing more attention than other impedance source networks in photovoltaic (PV) application due to its ability to deal with wide input voltage variation and its shoot-through capabilities and suitable for renewable energy system with large of gain. Feature of the qZSI is that it can draw continuous and constant current. The qZSI boost the input voltage by utilizing an extra switching state is the simultaneous conduction of both switches of the same leg in inverter-which is called as the shoot-through state [1]. This kind of operation forbidden in the traditional voltage source inverters (VSI) because it causes short circuit of the DC link capacitors.in the qZSI, shoot-through state is used to boost the magnetic energy stored in the dc-side inductors (L 1 and L 2 in Figure 1) without short-circuiting the dc capacitors C1 and C2. During this state, energy is first stored in the impedance network, and then released into the capacitors and load at non-shoot-through states. This increase in inductive energy, in turn, provides the boost of the output voltage VOduring the traditional operating states (active states) of the inverter.Most of the commercially available grid connected systems for renewable applications include a transformer, which enables the selection of a suitable dc voltage input for the inverter and isolates the energy source from the utility grid [2]. Converters including a transformer either use a line transformer or a highfrequency transformer. Line-frequency transformers are regarded as poor components due to increased size, weight, and prize. Converters with high-frequency transformers include various power stages and are pretty complex. In this paper a new system is proposed, which is having quasi z-source for the boost the voltage and inverter used as grid connected transformer-less system [3], which reduces size and cost. Unipolar pulse width modulation which is most commonly used PWM technique for this kind of system. To reduce the

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Section: Operation and Basic Implemention Of Srmentioning

confidence: 99%

Analysis, Design and Investigation on a New Single-Phase Switched Quasi Z-Source Inverter for Photovoltaic Application

Bharatiraja

Sanjeevikumar

Mahes

et al. 2017

IJPEDS

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“…A computer-aided design approach is proposed in [17] to optimize the efficiency of a resonant converter, in which a peak value of 97.4% was achieved. A modified topology of the resonant converter is proposed in [18], [19] with the aim of reducing the losses. In both studies Gallium-nitride devices are employed and a maximum efficiency of 97.5% and 98.3% is obtained in [18] and [19], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…A modified topology of the resonant converter is proposed in [18], [19] with the aim of reducing the losses. In both studies Gallium-nitride devices are employed and a maximum efficiency of 97.5% and 98.3% is obtained in [18] and [19], respectively. These designs are for low power (up to 300 W) and low voltage (up to 400 V) applications.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Reliable SiC-Based DC–DC Converter for Smart Transformer

Costa

Buticchi

Liserre

2017

IEEE Trans. Ind. Electron.

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Abstract-The series-resonant converter (SRC) has been used in several application and it recently became popular for Smart Transformers (STs). In this application, the efficiency and reliability are of paramount importance. Although many papers have addressed the design challenges to improve the converter efficiency, discussions about the reliability are still missing in literature. In this context, this paper presents a design procedure focusing on the efficiency and reliability improvement of the SRC for ST application. High efficiency is achieved through the use of Silicon-Carbide (SiC) MOSFETs, reducing conduction and switching losses, and the detail design procedure based on accurate losses modeling. High reliability is achieved through a fault tolerant topology and reliability-oriented design of the resonant circuit passive components. Experimental results obtained for the optimized 10 kW series resonant converter has shown an efficiency of 98.61%.

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“…As additional advantages, the converter has good transformer utilization and also low EMI emission, due to the smooth current shape (low di/dt). According to [20], the main problem with the SRC is the lack of input voltage regulation. On the other hand, it is an advantage for ST application, once the system has enough degrees of freedom to control the input voltage by using the front-end rectifier (first stage).…”

Section: Introductionmentioning

confidence: 99%

Highly efficient and reliable DC-DC converter for smart transformer

Costa

Buticchi

Liserre

2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Abstract-The series-resonant converter (SRC) has been used in several application and it recently became popular for Smart Transformers (STs). In this application, the efficiency and reliability are of paramount importance. Although many papers have addressed the design challenges to improve the converter efficiency, discussions about the reliability are still missing in literature. In this context, this paper presents a design procedure focusing on the efficiency and reliability improvement of the SRC for ST application. To improve the efficiency, losses modeling in all components is carefully carried out. Additionally, SiliconCarbide (SiC) MOSFETs are used to reduce the conduction and switching losses. The reliability is addressed on the converter design by taking the lifetime of the resonant capacitor and the stress on the main components. Experimental results obtained for the optimized 10 kW series resonant converter has shown an efficiency of 98.61%.

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A Hybrid Resonant Converter Utilizing a Bidirectional GaN AC Switch for High-Efficiency PV Applications

Cited by 77 publications

References 26 publications

Analysis, Design and Investigation on a New Single-Phase Switched Quasi Z-Source Inverter for Photovoltaic Application

Analysis, Design and Investigation on a New Single-Phase Switched Quasi Z-Source Inverter for Photovoltaic Application

Highly Efficient and Reliable SiC-Based DC–DC Converter for Smart Transformer

Highly efficient and reliable DC-DC converter for smart transformer

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