Buck–Boost Dual-Leg-Integrated Step-Up Inverter With Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids

Qin, Ling; Hu, Minqiang; Lu, Dylan Dah-Chuan; Feng, Zhiqiang; Wang, Ya-Fang; Kan, Jiarong

doi:10.1109/tpel.2017.2742667

Cited by 26 publications

(29 citation statements)

References 27 publications

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“…It can be expressed as: U om = mU C1 . Since the input average current is equal to the inductance average current, the following equations can be written as: (10) and the average value of i L1 can be obtained as: (11) According to (8)~(11), the equations of the input voltage and the DC bus voltage can be derived as: (12) The d i is taken as the valid value and the voltage gain can be expressed as: (13) Fig. 6 shows the three-dimensional relationships of voltage gain G versus inductance L 1 and modulation ratio m when f S = 20 kHz, R O = 100 Ω are given.…”

Section: A Analysis Of Voltage Gainmentioning

confidence: 99%

“…However, the volume and cost of the inverter are relatively high due to the existence of transformers. Some single stage boost inverters are studied in [1]- [20], for example: Z source inverter [4]- [5], double Boost inverter [8]- [9], double Cuk integrated inverter [10]- [11], Buck-Boost integrated inverter [12]- [13] and so on. The typical Z source inverter can achieve the function of the boost by using the controlled direct connection of the upper and lower bridge arm power switches.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Yu¹,

Hu²,

Yao³

et al. 2019

CPSS TPEA

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A novel transformerless boost inverter for standalone photovoltaic generation systems is proposed in this paper. The proposed inverter combines the boost converter with the traditional bridge inverter. The switch S 1 not only realizes the boost function but also participates in inverting process. The inverter has a higher voltage gain and good characteristics when the inductor L 1 is operated in discontinuous mode (DCM) and the nonpolarized capacitor can be chosen as bus capacitor, which makes the volume smaller and the service life of the inverter is increased. The inverter consists of five switches in which only two switches are operated at high frequency state and a monopole sinusoidal pulse width modulation (SPWM) strategy is used. Therefore, the modulation strategy of switches is very simple and the switching loss is reduced. The principle of inverter is described in detail and mathematical models are built by small-signal analysis. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.Index Terms-Boost inverter, discontinuous mode (DCM), monopole sinusoidal pulse width modulation (SPWM), nonpolarized capacitor, photovoltaic generation systems, transformerless.

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Section: A Analysis Of Voltage Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Yu¹,

Hu²,

Yao³

et al. 2019

CPSS TPEA

View full text Add to dashboard Cite

show abstract

“…Figure 9 illustrates the performance of the projected controller circuit; as can be seen, in different times of a switching period, the controller generates different pulses to switch on and off the power MOSFETs. Figure 10 shows a comparison between this approach and the proposed methods in [1], [20], and [26] for resistive loads. As can be seen, significantly better results are reported in the sinusoidal state.…”

Section: One-phase Systemmentioning

confidence: 99%

“…For transformerless applications, for obtaining a qualified power factor, several important issues like total harmonic distortion, DC current injection, and output voltage and current regulation should be considered. In order to limit the total harmonic distortion (THD) in output current or voltage signals, various PWM methods are intensively studied in pure sinusoidal inverters [20,21]. For a pulse width modulation (PWM) technique, the voltage gain is determining by calculating the ratio of the fundamental components of the AC side's voltage to the DC voltage of the input side.…”

Section: Introductionmentioning

confidence: 99%

THD minimization for Z-source-based inverters with a novel sinusoidal PWMswitching method

Ghaderi¹

2019

Turk J Elec Eng & Comp Sci

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This paper presents a modified sinusoidal pulse width modulation (SPWM) switching method for one-phase and investigated two-phase impedance-source inverter structures. The proposed structure generates pulses for a quasi-Z-source converter and this block produces a unilateral voltage sine wave in the block's output. This signal is applied to the inverter as its input wave. For this purpose, the novel SPWM method is proposed for power switches while being switched complementarily. Two power switches are used in the structure to generate the pure sinusoidal output voltage and to minimize total harmonic distortion (THD), which is an essential parameter in inverter design. The results show that the proposed method generates the pure sinusoidal voltage and current signals for resistive and inductive loads and pure voltage and improved current waves for capacitive loads in comparison with existing techniques, since the THD of the output voltage and current signals is strongly affected by the dynamic loads. This method leads to final cost improvement and reduction of the size of the system with fewer number of components, which are essential parameters for renewable energy resource applications. A mathematical model is validated with the 2017a version of MATLAB/Simulink and 1.51% and 1.33% THD values are reported for low and high power loads, respectively, in the one-phase structure and 0.95% and 0.87% in the two-phase system. Finally, a 120 W prototype has been implemented and tested. A sine-wave with 620 Vac peak to peak amplitude and 50 Hz frequency has been gained in the inverter's output and the quality of the voltage and current waveforms has been evaluated for different two 1.8 k Ω and 600 Ω resistive loads in the one-phase structure. Experimental results confirm all mathematical and simulation results.

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“…N many dc-ac power conversion systems, the input dc source is below the demanded peak voltage of the ac output [1], [2]. The boost dc-ac power conversion is therefore undeniably an important research topic of continuously growing importance in power electronics applications.…”

Section: Introductionmentioning

confidence: 99%

Single-Phase Simplified Split-Source Inverter (S³I) for Boost DC–AC Power Conversion

Lee

Tan

Ishak

et al. 2019

IEEE Trans. Ind. Electron.

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The single-phase split-source inverter is an emerging and attractive topology for boost dc-ac power conversion system. Such an inverter features high compactness, however, at the expense of high-frequency commutations across diodes. The corresponding hybrid PWM also confines the voltage harmonics to concentrate around the switching frequency and its multiples. This paper proposes a simplified split-source inverter which is realized by inserting only one power switch into an Hbridge. While generating the ac output, the newly developed PWM strategy ensures the inductor charged with constant duty-cycle. When compared to the existing split-source inverters, it offers the added benefits of reduced switch count, enhanced voltage boosting gain, reduced output filter requirement, and enhanced power efficiency. Comprehensive steady-state analysis is discussed while simulation and experimental results are subsequently presented to prove the validity of the proposed topology and the PWM strategy.Index Terms-Boost dc-ac power conversion, singlestage inverter, split-source inverter, pulse width modulation.

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Buck–Boost Dual-Leg-Integrated Step-Up Inverter With Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids

Cited by 26 publications

References 27 publications

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

THD minimization for Z-source-based inverters with a novel sinusoidal PWMswitching method

Single-Phase Simplified Split-Source Inverter (S³I) for Boost DC–AC Power Conversion

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Buck–Boost Dual-Leg-Integrated Step-Up Inverter With Low THD and Single Variable Control for Single-Phase High-Frequency AC Microgrids

Cited by 26 publications

References 27 publications

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

Analysis and Design of a Transformerless Boost Inverter for Stand-Alone Photovoltaic Generation Systems

THD minimization for Z-source-based inverters with a novel sinusoidal PWMswitching method

Single-Phase Simplified Split-Source Inverter (S3I) for Boost DC–AC Power Conversion

Contact Info

Product

Resources

About

Single-Phase Simplified Split-Source Inverter (S³I) for Boost DC–AC Power Conversion