A Family of High-Frequency Isolated Single-Phase Z-Source AC–AC Converters With Safe-Commutation Strategy

Ahmed, Hafiz Furqan; Cha, Honnyong; Khan, Ashraf Ali; Kim, Heung-Geun

doi:10.1109/tpel.2016.2539216

Cited by 64 publications

(75 citation statements)

References 32 publications

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“…Moreover, similar to the converter proposed in [29]- [32], the converter has not the same buck/boost operation process for non-inverting and inverting modes and have not the common ground on input and output. In addition, a high-frequency isolated AC-AC converter with bipolar voltage gain is proposed in [33]- [34]. However, this converter has some drawbacks, such as a converter proposed in [34] needs to a safe-commutation strategy, which reduces its reliability.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Bipolar-Type AC–AC Converter Topology Based on Nondifferential Dual-Buck PWM AC Choppers

Wang

Cai

et al. 2021

IEEE Trans. Power Electron.

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A novel single-phase pulse width modulation (PWM) direct ac-ac converter based on two-level non-differential dual-buck ac chopper legs with inverting and non-inverting operations is first proposed in this paper. It has the ability to resolve both voltage sag and swell problems at the same time when used as distributed flexible voltage conditioner (DFVC). Compared to the traditional ac-ac converter, it has much enhanced system reliability thanks to no shoot-through problems even when all switches of each ac chopper legs are turned on, and therefore, the PWM dead-time is not needed leading to improving the utilization of the duty cycles. Only half of the switches in the proposed converter are switched at high frequency during a switching period at most, which significantly reduces the total switching loss. In particularly, the converter has two greatest advantages that it retains the common sharing ground of the input and output and has the same buck/boost operation process for non-inverting and inverting modes. In order to fully testify the performance of the proposed converter, a 500W experimental prototype is built and tested at different conditions.

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Section: Introductionmentioning

confidence: 99%

“…In addition, a high-frequency isolated AC-AC converter with bipolar voltage gain is proposed in [33]- [34]. However, this converter has some drawbacks, such as a converter proposed in [34] needs to a safe-commutation strategy, which reduces its reliability.…”

Section: Introductionmentioning

confidence: 99%

An Improved Bipolar-Type AC–AC Converter Topology Based on Nondifferential Dual-Buck PWM AC Choppers

Wang

Cai

et al. 2021

IEEE Trans. Power Electron.

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“…It also faces a reliability problem. The Z-source converters are another approach for bipolar voltage characteristics, but they require the snubber circuits to avoid the problems initiated by the current commutation [35]. The safe commutation with bipolar voltage features is ensured in [36] by employing the switching cell arrangement.…”

Section: Introductionmentioning

confidence: 99%

A New Single-Phase AC Voltage Converter With Voltage Buck Characteristics for Grid Voltage Compensation

et al. 2020

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Voltage sags and swells are the major problems of the power distribution system that arise due to uneven distribution of the single-phase and nonlinear loads. They severely degrade the power quality and may cause the failure of the equipment at the user's side. The voltage sag and swell issues are compensated by operating the AC voltage controllers with bipolar voltage gain characteristics. In these converters, high switching voltage and current, and a large number of switching devices are the main issues that cause unwanted power losses and result in reduced efficiency of the system. High voltage stresses may cause device failure due to the increase in dv/dt rating. The large count of switching devices results in high cost and high conversion losses. So here, we propose a novel AC converter with fewer switching devices that reduces switching voltage and current to have low conversion losses. The amplitude of the output is governed through the direct PWM control (DPWM) of one switch that controls the switching state of the other switch indirectly called indirect PWM control switch (IDPWM). The detailed analysis of the proposed converter is carried out to compare its performance with the existing converters. MATLAB/Simulink environment-based simulation results are proved through the experimental results obtained by developing a hardware prototype. INDEX TERMS Bipolar voltage gain, power distribution system, power quality, PWM control, switching and conduction losses, switching voltage, voltage sag and swell.

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“…Impedance source inverters (ZSIs) provide an enhanced power conversion capability with a similar functionality as boost inverters without inserting any extra active elements and with simple control strategies [11]. The concept of impedance source converters has been implemented for (i) AC-AC converters [12][13][14][15][16], (ii) DC-DC converters [17][18][19][20], (iii) AC-DC rectifiers [21][22][23][24] and (iv) DC-AC inverters [25][26][27][28][29][30][31][32][33][34]. Based on these merits, ZSIs start to penetrate various industrial application markets, such as electric vehicles [35][36][37][38][39][40], renewable energy-distributed generation [41][42][43][44][45][46], battery energy storage [47,48], and uninterruptable power supply (UPS) [49,50].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance Modified Discontinuous PWM Technique for Three-Phase Z-Source Inverter

et al. 2020

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Various industrial applications require a voltage conversion stage from DC to AC. Among them, commercial renewable energy systems (RES) need a voltage buck and/or boost stage for islanded/grid connected operation. Despite the excellent performance offered by conventional two-stage converter systems (dc–dc followed by dc–ac stages), the need for a single-stage conversion stage is attracting more interest for cost and size reduction reasons. Although voltage source inverters (VSIs) are voltage buck-only converters, single stage current source inverters (CSIs) can offer voltage boost features, although at the penalty of using a large DC-link inductor. Boost inverters are a good candidate with the demerit of complicated control strategies. The impedance source (Z-source) inverter is a high-performance competitor as it offers voltage buck/boost in addition to a reduced passive component size. Several pulse width modulation (PWM) techniques have been presented in the literature for three-phase Z-source inverters. Various common drawbacks are annotated, especially the non-linear behavior at low modulation indices and the famous trade-off between the operating range and the converter switches’ voltage stress. In this paper, a modified discontinuous PWM technique is proposed for a three-phase z-source inverter offering: (i) smooth voltage gain variation, (ii) a wide operating range, (iii) reduced voltage stress, and (iv) improved total harmonic distortion (THD). Simulation, in addition to experimental results at various operating conditions, validated the proposed PWM technique’s superior performance compared to the conventional PWM techniques.

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A Family of High-Frequency Isolated Single-Phase Z-Source AC–AC Converters With Safe-Commutation Strategy

Cited by 64 publications

References 32 publications

An Improved Bipolar-Type AC–AC Converter Topology Based on Nondifferential Dual-Buck PWM AC Choppers

An Improved Bipolar-Type AC–AC Converter Topology Based on Nondifferential Dual-Buck PWM AC Choppers

A New Single-Phase AC Voltage Converter With Voltage Buck Characteristics for Grid Voltage Compensation

Enhanced Performance Modified Discontinuous PWM Technique for Three-Phase Z-Source Inverter

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