Active Virtual Ground— Single-Phase Transformerless Grid-Connected Voltage Source Inverter Topology

Li, River Tin Ho; Ho, Carl Ngai Man; Chen, Eric-Xu

doi:10.1109/tpel.2017.2690146

Cited by 45 publications

(14 citation statements)

References 13 publications

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“…The selected topologies are compared in terms of switching voltage stress, switching current stress, volume of inductor, voltage conversion ratio, components count, and size of the converter and summarized in Table 2. The proposed inverter uses the least component counts compared with other related topologies presented in Table 2 30,39–42 . This intern makes the proposed inverter cost‐effective and more reliable.…”

Section: Derivation Of a Family Of Two Winding Semi‐mcis Invertersmentioning

confidence: 83%

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A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

Gautham

Reddivari

Jena

2020

Circuit Theory & Apps

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Summary This paper presents a new two winding coupled inductor architecture for a semi magnetically coupled impedance source (SMCIS) inverter by connecting the coupled inductor windings in flipped gamma fashion. The proposed topology is derived from the conventional MCIS inverters. It can produce sinusoidal output voltage/current without using any shoot‐through operation and output LC filter, which improves the system reliability. Further, a doubly grounded feature, no start‐up inrush current, reduced component count, low input current ripple, continuous output currents, and small leakage currents are the major advantages of the proposed inverter. However, the proposed semi flipped gamma MCIS inverters still suffer from limited output voltage gain problem. The voltage‐boosting feature is added to the proposed inverter by connecting two converter modules in differential boost configuration through the embedded structure. The voltage‐boosting ability is the major advantage of this differential boost embedded configuration. It has flexibility in choosing a wide range of duty cycle operation from zero to one (whereas, the duty cycle was limited to 0.666 in case of semi‐Z‐source inverter [ZSI]). The modes of operation, design procedure, and feature comparisons of proposed inverters are discussed in this paper. Finally, the effectiveness of proposed inverters is validated through simulation and experimental results in terms of component count, voltage gain, and feature comparison.

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Section: Derivation Of a Family Of Two Winding Semi‐mcis Invertersmentioning

confidence: 83%

“…The HERIC and NPC converters 40,41 suffer from high conduction losses due to more switches 44–46 . In addition, the shoot‐through risk and high components count are the common limitations associated with the H‐5, HERIC, NPC, and AVG inverters 39–42 …”

Section: Derivation Of a Family Of Two Winding Semi‐mcis Invertersmentioning

confidence: 99%

A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

Gautham

Reddivari

Jena

2020

Circuit Theory & Apps

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“…1 Nevertheless, common mode leakage current (CMLC) exists in the nonisolated PV grid-connected inverters, which causes personal safety problem, induces electromagnetic interference, increases inverter losses, and decreases grid current quality. [2][3][4][5] In order to List of Symbols and Abbreviations: i g , Grid current; U in , Input voltage; u g , Grid voltage; i L1 -i L3 , Currents through L 1 -L 3 , respectively; I refm , Maximum value of the reference grid current; U inf , Feedback voltage of U in ; u gf , Feedback voltage of u g ; iL1_ref, Reference current of L 1 ; i L1f , Feedback current of L 1 ; iL2_ref, Reference current of L2; iL2f, Feedback current of L2; φg, Phase of u g ; pin, Instantaneous input power; po, Instantaneous output power; U g , Root-mean-square (RMS) value of u g ; u ds1 -u ds4 , Drain-source voltages of S 1 -S 4 , respectively; u d1 and u d2 , Voltages across D 1 and D 2 , respectively; uC, Voltage across capacitor C; d 2 , Duty ratio of S 2 ; d 1 , Duty ratio of S 1 ; P o , Output power; f s , Switching frequency; U gp , Maximum value of u g ; I gp , Peak value of i g .…”

Section: Introductionmentioning

confidence: 99%

“…reduce the CMLC, control methods can be changed or extra semiconductors can be added to conventional PV gridconnected inverters. [2][3][4] Nevertheless, variations in the environment and parameters of semiconductors may affect the CMLC. Therefore, a doubly grounded nonisolated grid-connected inverter was presented by directly connecting the grounds of the grid and PV panels, which can eliminate the CMLC thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Single‐stage high reliability doubly grounded nonisolated PV grid‐connected inverter

Yao

2021

Int Trans Electr Energ Syst

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Nonisolated PV grid-connected inverters are extensively used in renewable generation systems. However, there is a shoot-through issue in traditional voltage-source inverters and common mode leakage current (CMLC) in nonisolated PV inverters. In order to address the aforementioned problems, a single-stage high reliability doubly grounded nonisolated PV grid-connected inverter is presented. The inverter is composed of a buck converter and a buck-boost converter, which operates in the positive and negative half grid periods, respectively. Grounds of the grid and PV array are shorted to eliminate the CMLC. The sinusoidal pulse width modulation (SPWM) is adopted in the proposed inverter. The proposed inverter is a single-stage system in each half grid cycle. There is no CMLC in the proposed inverter. Voltage across all semiconductors is not affected by the intrinsic capacitors of them. In addition, the inverter does not have the shoot-through issue, which increases reliability of the inverter. Only one switch is high frequency operated in each half grid period, so efficiency of the inverter can be improved, which is 98.6%. Experimental results of a 250 W single-stage high reliability doubly grounded nonisolated PV grid-connected inverter confirm the theoretical analysis. The inverter can be used in the PV application with high reliability and no CMLC.

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“…bipolar modulation) where the efficiency is relatively low due to the increased power losses (core and switches), and in three-level switching scheme (i.e. unipolar and hybrid modulation) where the efficiency is more than the twolevel one [2]. The main advantage of using non-isolating inverter topologies is its high conversion efficiency, low implementation cost and small size [3].…”

mentioning

confidence: 99%

Novel High Efficiency H-Bridge Transformerless Inverter for Grid-Connected Single-Phase Photovoltaic Systems

Khan

Forouzesh

Siwakoti

et al. 2018

2018 IEEE Region Ten Symposium (Tensymp)

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This paper proposes a new H-bridge type transformerless inverter for grid-connected photovoltaic (PV) application. The proposed H-bridge zero voltage switch controlled rectifier (HB-ZVSCR) inverter uses additional switches and diodes at the AC side with voltage clamping feature to the DC midpoint. Main characteristics of the proposed inverter are the high conversion efficiency and low leakage current, which make it a suitable candidate for grid-connected PV applications. The analysis and operating principles of the proposed inverter are discussed in details. This theoretical findings has been simulated using PLECS software to verify the common mode voltage (CMV) and leakage current behaviors and the results are compared with similar existing midpoint voltage clamping inverter topologies (i.e. HB-ZVR and HB-ZVR-D). Furthermore, power loss and efficiency of the proposed inverter have been evaluated and compared with existing topologies.

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Active Virtual Ground— Single-Phase Transformerless Grid-Connected Voltage Source Inverter Topology

Cited by 45 publications

References 13 publications

A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

A cost‐effective single‐phase semi flipped gamma type magnetically coupled impedance source inverters

Single‐stage high reliability doubly grounded nonisolated PV grid‐connected inverter

Novel High Efficiency H-Bridge Transformerless Inverter for Grid-Connected Single-Phase Photovoltaic Systems

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