Soft-Switched Modulation Techniques for an Isolated Bidirectional DC–AC

Wang, Mengqi; Huang, Alex Q.; Guo, Suxuan; Yu, Xiaohang; Yu, Wensong

doi:10.1109/tpel.2017.2661965

Cited by 51 publications

(13 citation statements)

References 19 publications

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“…However, in the output stage switches are voltagecurrent-bidirectional switches which must be commutated such that never short the input port voltage and cut the output port current path. For this purpose, four-step commutation process based on the sign of switches voltage or current is proposed in the literature which is more complicated than that of conventional voltage source converters [16,18,19].…”

Section: Commutation Methodsmentioning

confidence: 99%

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Unidirectional isolated high‐frequency link DC/AC converter for grid integration of DC sources

Hojabri

2019

IET Renewable Power Generation

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Most of the converters used for the grid integration of DC resources are multi-stage DC/AC converters with a huge intermediate DC-link capacitor. This bulky DC-link capacitor increases the converter volume and cost, reduces its lifetime and reliability and, causes converters fault ride-through problems. For this purpose, DC/AC converters without any intermediate energy storage components are proposed in the literature named high-frequency AC (HFAC) link converters. However, due to a large number of active switches, modulation and commutation methods of these converters are overly complex compared with their conventional multi-stage versions. In this study, a new isolated unidirectional converter without any intermediate energy storage components, and with a reduced number of active switches are proposed for the grid integration of DC sources. The proposed HFAC converter structure is simple but more efficient and reliable than its conventional isolated multi-stage and HFAC versions. The converter modulation and commutation methods which are more simple than those of its conventional HFAC version, and its voltage and current gains are also presented. The performance of the proposed converter is verified through simulation in the islanded and grid-connected modes of operation. A simple experimental setup is also provided to validate the simulated converter.

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Section: Commutation Methodsmentioning

confidence: 99%

“…However, the main drawback of the HFAC converters is their large number of active switches. Due to a large number of active switches, commutation and modulation methods of these types of converters are too complex compared with their conventional multi-stage DC/AC converters [15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Unidirectional isolated high‐frequency link DC/AC converter for grid integration of DC sources

Hojabri

2019

IET Renewable Power Generation

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“…In case of isolated systems, line‐/high‐frequency transformer is used for galvanic isolation and voltage step‐up aspects, 1,2 as isolated systems are rigid, more efficient, and reliable. On the other hand, isolated systems using line‐frequency transformers degrade the overall efficiency 3 …”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, isolated systems using line-frequency transformers degrade the overall efficiency. 3 Alternatively, transformer-less two-stage nonisolated topologies can be employed, where the first stage boosts the input DC voltage using DC-DC converter while the second stage applies DC/AC conversion using VSI. The employed VSI requires an output filter to produce a pure sinusoidal output voltage.…”

mentioning

confidence: 99%

Three‐phase two‐leg buck‐boost DC‐AC inverter with differential power processor unit

Hossam-Eldin

Elserougi

Abdelsalam

et al. 2020

Circuit Theory & Apps

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Renewable energy sources (RESs) need power-electronics-based converters to deliver the acquired power to the grid. Those converters should provide voltage-bucking/boosting capabilities to accommodate various grid modes specially for three-phase distorted commonly unbalanced distribution utility networks. Several power electronic-based converters have been elaborated to fulfill this high-demand market. Single-stage converters are the most dominant in the market where the current source inverters (CSIs), impedance source inverters (ZSIs), and boost inverters are the high-end candidates. The aspects of cost, footprint, and minimal numbers of active switches, in addition to simplified controllability, build the main challenges that face the evolution of robust renewable energy-associated grid-tied converters. This paper presents a novel three-phase differential-mode buck-boost inverter based on two bidirectional buck-boost DC/DC converters and one differential power processor (DPP) unit. The proposed topology is a single-stage DC/AC converter offering bucking/boosting capability, with reduced hardware requirements. The proposed topology features a simplified control methodology in addition to reduced size and cost of the hardware setup which makes it more suitable for grid-tied renewable energy applications. The operation principles, small-signal model, and control strategy of the proposed topology are also illustrated. Simulation and experimental results are presented in details to verify the topologyenhanced performance under various operating conditions. The deducted results elucidate the viability of the proposed configuration alongside with the claimed merits. K E Y W O R D S DC/AC buck-boost inverter, DC/DC buck-boost converter, three-phase DC/AC inverter, threephase two-leg inverter 1 | INTRODUCTION Various renewable energy sources require the utilization of power electronics-based converter for maximum power tracking and grid integration purposes. The conventional two-level voltage source inverter (VSI) has been the most common grid-tied converter topology for DC/AC conversion applications. Due to the voltage buck nature of VSI, the

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“…These capacitors can be large and expensive [8]. Otherwise, there are different topologies that perform DC-AC conversion in an isolated and bidirectional way without the need for an intermediate stage of conversion [9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Novel modified phase‐shift modulation strategy for isolated AC–DC power converters

Llomplat

Bosso

Carballo

et al. 2020

IET Power Electronics

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Different power converter topologies are used to perform the energy exchange between an AC grid and a DC source belonging to a hybrid electric micro-grid. A single-phase single-stage isolated AC-DC power converter is one of them. Moreover, this power converter can operate under different modulation strategies. The phase-shift modulation (PSM) strategy is capable of varying the phase between the voltages applied to the high-frequency transformer terminals of the power converter in order to control the energy flow in both directions. Based on the PSM strategy, this study presents a novel modified PSM strategy capable of controlling the power flow in both directions and obtaining a current with low total harmonic distortion and a power factor close to 1 for the entire operating range on the AC side. Considering the novel modulation strategy to be proposed, a comparison of three PSM-based modulation strategies was carried out taking into account the total harmonic distortion of current injected into the AC grid, the power factor and the average power transferred. A theoretical analysis was carried out and the results obtained were validated by means of experimental results.

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Soft-Switched Modulation Techniques for an Isolated Bidirectional DC–AC

Cited by 51 publications

References 19 publications

Unidirectional isolated high‐frequency link DC/AC converter for grid integration of DC sources

Unidirectional isolated high‐frequency link DC/AC converter for grid integration of DC sources

Three‐phase two‐leg buck‐boost DC‐AC inverter with differential power processor unit

Novel modified phase‐shift modulation strategy for isolated AC–DC power converters

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