Novel Family of Single-Stage Buck–Boost Inverters Based on Unfolding Circuit

Husev, Oleksandr; Matiushkin, Oleksandr; Roncero‐Clemente, Carlos; Blaabjerg, Frede; Vinnikov, Dmitri

doi:10.1109/tpel.2018.2879776

Cited by 42 publications

(23 citation statements)

References 37 publications

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“…For a pulsatory waveform, the average value is equal to the peak value multiplied by the duty cycle of the waveform. Therefore, by considering i p inv as the peak value of i inv , the average current of i inv , which is equal to i L 1 , in each switching cycle is as follows: According to Equation (12), diode D turns off, once i L 1 = −i C 2 . According to Equation (13), at m(t) = 0.5, the inductor current is equal to −i C 2 .…”

Section: Investigation Of Unwanted Load Effects On the Inverter Permentioning

confidence: 99%

“…11 Many researches had been done on single-stage inverters in recent years, in which a lot of converters have been proposed and investigated. 12,13 Unfolding inverters, 12 differential inverters, 14,15 impedance network inverters (INIs), 16,17 and Cuk-derived inverters 18,19 are the most well-known structures. Flyback inverter (isolated) 11 and Aalborg inverter (nonisolated) 20 are two types of unfolding inverters.…”

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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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Section: Investigation Of Unwanted Load Effects On the Inverter Permentioning

confidence: 99%

mentioning

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

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“…However, in total, the topology in [22] had four switches, eight diodes, and four inductors. The tapped-inductor buck-boost inverter topologies presented in [23,24], as shown in Figure 2b,c, respectively, can achieve a much higher voltage gain than the traditional ones, but the switch counts were up to eight, whereas [25,26] had five switches, as presented in Figure 2d. The advantage of the topologies in [25,26] is that only one high-frequency switch was used, and thus, the switching losses were lower.…”

Section: Introductionmentioning

confidence: 99%

“…What is more, more detailed simulation studies for all the topologies Figure 2. Prior-art, single-stage, buck-boost inverters with high gains: (a) [22], (b) [23], (c) [24], and (d) [25].…”

Section: Introductionmentioning

confidence: 99%

A Family of Single-Stage, Buck-Boost Inverters for Photovoltaic Applications

et al. 2020

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This paper introduces a family of single-stage buck-boost DC/AC inverters for photovoltaic (PV) applications. The high-gain feature was attained by applying a multi-winding tapped inductor, and thus, the proposed topologies can generate a grid-level AC output voltage without using additional high step-up stages. The proposed topologies had a low component count and consisted of a single magnetic device and three or four power switches. Moreover, the switches were assembled in a push-pull or half/full-bridge arrangement, which allowed using commercial low-cost driver-integrated circuits. In this paper, the operation principle and comparison of the proposed topologies are presented. The feasibility of the proposed topologies was verified by simulations and experimental tests.

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“…The input voltage is boosting to the constant dc-link voltage. The Buck stage performs further modulation, which is unfolding to the sinusoidal voltage.A modified solution based on the inverting buck-boost dc-dc converter that allows reducing count of inductors is proposed in [39,40]. This paper discusses a grid-connected application of the proposed above discussed solution along with its bidirectional application which extends its application.…”

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confidence: 99%

Bidirectional Twisted Single-Stage Single-Phase Buck-Boost DC-AC Converter

et al. 2019

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This paper describes a bidirectional twisted single-phase single-stage buck-boost dc-ac converter based on an output unfolding circuit. This solution is derived by the combination of an inverting buck-boost dc-dc converter and an unfolding circuit. The operation principle, component design guidelines, along with the control approach are presented. The zero-crossing distortion problem is discussed and solved by a simple approach. The simulation and experimental results confirm all theoretical statements. Loss distribution and achievable efficiency are analyzed. Finally, the pros and cons of the proposed solution, along with the most promising application field, are analyzed and discussed in the conclusion.Another application field of the dc-ac converter with wide input voltage regulation is battery storage. Lithium-ion batteries are targeted to become the most popular choice for on-grid and grid-off solar battery storage in the foreseeable future. Such types of batteries have a wide range of input voltage. A converter that accepts different storage elements is preferable.Several single-stage alternatives were presented as alternative solutions. Inverters with an active boost cell were described in [6][7][8][9]. These inverters provide very high boost of the input voltage but suffer from high current spikes in the semiconductors and passive elements. Impedance-source networks have been reported in many research papers as a promising single-stage solution. Z-source inverters (ZSIs) and quasi-Z-source inverters (qZSIs) were proposed for different applications. Existing solutions were reviewed in [10][11][12][13][14], and different relevant issues are addressed in [15][16][17][18][19][20]. However, recent research revealed evident drawbacks of the IS-based converters in terms of power density and efficiency [21][22][23].Split-source inverters (SPIs) [24,25] were proposed as another alternative solution. According to the literature, SPIs have less passive component counts accompanied by higher voltage and current stresses at lower voltage gains, and they do not have short circuit immunity.Several interesting single-stage buck-boost inverters were proposed in [26][27][28][29]. At the same time all of them did not find industrial application. For example, the solution [26] requires reverse-blocking IGBTs, while others are quite complex solutions.An Aalborg inverter ( Figure 1b) is proposed as an inverter that combines buck and boost functionality [30][31][32][33][34][35]. These solutions have two independent buck-boost stages that are responsible for output sinusoidal voltage generation. The main advantage of the proposed solution is in the minimum voltage drop of the filtering inductors in the power loop at any time. At the same time, this solution uses a double number of semiconductors and an inductor in the buck and boost stage, which is an obvious drawback. Another drawback consists in the two power sources utilization. A similar idea with double components is discussed in [36].The solution based on the input boost a...

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Novel Family of Single-Stage Buck–Boost Inverters Based on Unfolding Circuit

Cited by 42 publications

References 37 publications

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

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

A Family of Single-Stage, Buck-Boost Inverters for Photovoltaic Applications

Bidirectional Twisted Single-Stage Single-Phase Buck-Boost DC-AC Converter

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