A double-input DC-DC converter for hybrid supply systems

Mohammadi, Mohammad; Milimonfared, Jafar; Behbahani, M. R. M.; Moghani, Javad Shokrollahi; Moradi, Hadi

doi:10.1109/pedstc.2015.7093245

Cited by 8 publications

(3 citation statements)

References 17 publications

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“…On the other hand, in boosting modes, the impedance network is active to build a rectified switched sine-wave across v PN . Therefore, according to (6), D ST is as follows:…”

Section: Review Of Pwam In Impedance Network Invertersmentioning

confidence: 99%

“…Due to the availability and simplicity of energy generation from sunlight, photovoltaics (PVs) are fast becoming necessary energy resources, in recent decades. Despite their advantages, PVs suffer from several major drawbacks: (1) The generated voltage is DC; (2) the produced power and voltage depends on the irradiation of sunlight and the ambient temperature 4–6 . Accordingly, grid‐connected inverters with buck–boost capability are of paramount importance in utilizing PV systems 7,8 …”

Section: Introductionmentioning

confidence: 99%

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Performance improvement of pulse width‐amplitude modulation‐based quasi‐Z‐source inverters: Analysis and implementation

Mohammadi

Mirzaee

Magnone

et al. 2020

Circuit Theory & Apps

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Pulse width-amplitude modulation (PWAM) have been widely used in recent years to mitigate switching losses as well as reducing passive components' size. This paper precisely investigates this modulation approach in quasi-Z-source inverters (qZSI). It will be concluded that the existence of capacitive paths from load to source in such converters causes two undesired behaviors while utilizing PWAM, which increases total harmonic distortion and semiconductor stresses. Bypassing the capacitive paths is proposed in this paper to alleviate these issues. In order to implement this approach, a bidirectional quasi-Z-source inverter is studied. A design procedure is presented to achieve a fast dynamic response for tracking reference voltage. The operation of both conventional and bidirectional qZSI under different loads including resistive and resistive-inductive loads is investigated in the simulation and experiment. According to experimental results, by utilizing bidirectional qZSI, THD is improved from 12.34% to 3.51% for a lag load. Moreover, the voltage stress of the semiconductor no longer exists. K E Y W O R D S low impedance path, pulse width-amplitude modulation, quasi-Z-source inverter, regenerative current 1 | INTRODUCTION Global warming and environmental pollution are increasingly recognized as serious worldwide public health concerns. 1-3 Due to the availability and simplicity of energy generation from sunlight, photovoltaics (PVs) are fast becoming necessary energy resources, in recent decades. Despite their advantages, PVs suffer from several major drawbacks: (1) The generated voltage is DC; (2) the produced power and voltage depends on the irradiation of sunlight and the ambient temperature. 4-6 Accordingly, grid-connected inverters with buck-boost capability are of paramount importance in utilizing PV systems. 7,8 Voltage source inverters (VSIs) are the most well-known and popular inverter. Due to the well operation of VSIs, they are one of the most important structures in power electronics. 9,10 However, the buck characteristic of VSIs is a major problem with this kind of inverter in grid-tied PV applications. To overcome this issue, two approaches would be

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“…On the other hand, in boosting modes, the impedance network is active to build a rectified switched sine-wave across v PN . Therefore, according to (6), D ST is as follows:…”

Section: Review Of Pwam In Impedance Network Invertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance improvement of pulse width‐amplitude modulation‐based quasi‐Z‐source inverters: Analysis and implementation

Mohammadi

Mirzaee

Magnone

et al. 2020

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…Accordingly, to increase the reliability of supply systems, usually, a storage system is used to supply the power in the case that the PV extracted power is not enough. [5][6][7][8][9][10][11][12] In addition, the generated voltage by the commercial products is not as large as the required level for grid connected inverters. Accordingly the voltage gain of conventional boost converters is not as much as the required value.…”

Section: Introductionmentioning

confidence: 99%

A bidirectional high step-up multi-input DC-DC converter with soft switching

KhademiAstaneh

Javidan

Valipour

et al. 2018

Int Trans Electr Energ Syst

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Summary With the advancement of technology in renewable energy resources, the researchers and engineers have been more interested in utilizing such energy resources in various types of applications. To utilize commercial loads, the produced energy should be transferred to a high voltage (HV) DC link. In this paper, a double input HV gain DC‐DC converter is proposed. The soft switching capability and bidirectional power flow are achieved in the proposed topology using a coupled inductor structure. Thanks to an improved switching strategy for different power flow modes, soft switching operation of four main switches is achieved in low voltage (LV) to HV power flow direction. In HV to LV power transfer, the soft switching of the half of switches still exists. Moreover, a HV gain is achieved due to utilizing the coupled inductor. To validate the operation of proposed converter in different operation modes, a laboratory prototype was tested, which its results is presented in the paper.

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