Single-Phase Transformerless Photovoltaic Inverter With Suppressing Resonance in Improved H6

Akpınar, E.; Balikci, Abdul; Durbaba, Enes; Azizoglu, Buket Turan

doi:10.1109/tpel.2018.2886054

Cited by 30 publications

(13 citation statements)

References 29 publications

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“…Inductors are key components in the operating principle of most industrial power electronics converters such as EV chargers [1], [2], PFC rectifiers [3], traditional single-phase SMPS [4], and low-power and multi-megawatt inverters for distributed and centralized renewable energy generation systems [5]- [7]. Inductors strongly influence the volume, weight, cost and efficiency of these converters [8]- [10].…”

Section: Introductionmentioning

confidence: 99%

Winding Resistance Measurement in Power Inductors - Understanding the Impact of the Winding Mutual Resistance

et al. 2021

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Inductors are cornerstone components in power electronics converters. Since winding loss is the dominant loss mechanism in these components, its accurate measurement is fundamental for the validation of the inductor's operation and design. The techniques for the winding resistance Rw measurement in power inductors can be classified into two groups, indirect and direct. Both techniques use coupled inductors to separate winding and core power losses. If coupled inductors with non-zero winding mutual resistances Rw,m are used, invalid results are obtained with these techniques. Understanding the meaning of Rw,m in coupled inductors is complex. In this paper, the impact of Rw,m on the inductor Rw measurement techniques is demonstrated and practical guidelines for the design of the zero Rw,m coupled inductors are given. Particularly, the location of the auxiliary winding for the direct technique is investigated. In order to compare the Rw measurement techniques and to validate the coupled inductor's Rw,m impact, two different inductors are built and tested. The results are compared with the values for Rw calculated by FEA simulation. It is found that only the direct technique with an auxiliary winding carefully designed and located following the guidelines given in this paper makes the accurate measurement of Rw in power inductors possible.

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Section: Introductionmentioning

confidence: 99%

Winding Resistance Measurement in Power Inductors - Understanding the Impact of the Winding Mutual Resistance

et al. 2021

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“…Switch T B1 turns on to connect point A (or B) to point O in freewheeling mode. A new circuit configuration for the inverter with a single dc-link capacitor and seven insulated gate bipolar transistors (IGBTs) is proposed in [54]. The additional switch is turned on in the freewheeling modes, and two turn-OFF snubber circuits are added in parallel to the switches in order to share the input dc voltage between the snubber capacitors.…”

Section: Npc Cells For Uspwmmentioning

confidence: 99%

A Topology Synthetization Method for Single-Phase, Full-Bridge, Transformerless Inverter with Leakage Current Suppression—Part II

et al. 2020

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This paper proposes a topology derivation methodology to achieve small leakage current or zero leakage current for photovoltaic application. The core of the proposed method is a unified topology model and MN principle to show how to derive all possible topologies based on unipolar sinusoidal pulse width modulation (USPWM) and double-frequency USPWM (DFUSPWM). Part II of this paper discusses the topology synthetization method to achieve zero leakage current. Two types of neutral point clamped (NPC) topologies based on USPWM and DFUSPWM are elaborated. Two possible connections for the NPC cell are introduced, and detailed NPC topology derivation procedures are also provided. All existing NPC topologies are derived, and twenty-two new NPC topologies are found based on the new topology derivation methodology for a single-phase, full-bridge, transformerless inverter.

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“…Grid-connected inverters can interface both the PV source and the grid side. On the PV side, it can extract the available maximum power from the PV panels, whereas it transfers sinusoidal current to the grid side [29][30][31]. The power injected to the grid needs to fulfill the requirement of the grid, which is highly dependent on the performance of the grid-connected PV inverters.…”

Section: Transformerless Grid-connected Topologies With Step-up Abilitymentioning

confidence: 99%

A Review on Transformerless Step-Up Single-Phase Inverters with Different DC-Link Voltage for Photovoltaic Applications

et al. 2019

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Photovoltaic (PV) energy has been competitive in power generation as an alternative to fossil energy resources over the past decades. The installation of grid-connected solar energy systems is expected to increase rapidly with the fast development of the power electronics technology. As the key to the interface of the PV energy and the grid, power converters should be reliable, efficient and comply with the grid requirements. Considering the nature of PV energy, the power conversion should be flexible (e.g., high step-up DC-DC conversion and harmonic-free DC-AC conversion). Accordingly, many power electronic converters have been reported in literature. Compared with isolated inverters, transformerless inverters show great advantages. This paper thus presents an overview of the transformerless step-up single-phase inverters for PV applications based on the dc-link configurations. Grid-connected PV inverters are classified as constant dc-link voltage structures, pseudo-dc-link voltage structures, pulsating dc-link voltage structures and integrated dc-link voltage structures. The discussion on the composition of different dc-link structures is presented, which provides guidance to select appropriate transformerless inverter topologies for PV applications.

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Single-Phase Transformerless Photovoltaic Inverter With Suppressing Resonance in Improved H6

Cited by 30 publications

References 29 publications

Winding Resistance Measurement in Power Inductors - Understanding the Impact of the Winding Mutual Resistance

Winding Resistance Measurement in Power Inductors - Understanding the Impact of the Winding Mutual Resistance

A Topology Synthetization Method for Single-Phase, Full-Bridge, Transformerless Inverter with Leakage Current Suppression—Part II

A Review on Transformerless Step-Up Single-Phase Inverters with Different DC-Link Voltage for Photovoltaic Applications

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