A Capacitance-Minimized, Doubly Grounded Transformer less Photovoltaic Inverter With Inherent Active-Power Decoupling

Xia, Yunfeng; Roy, Jinia

doi:10.1109/tpel.2016.2606344

Cited by 120 publications

(46 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As presented in Tables 1 and 2 the duty cycle of the boost used in the half bridge inverter topology is higher than that used in the full bridge topology with 5 % (10 % higher than a full bridge inverter) that enhances the conduction losses in the IGBT with the same amount, because the conduction losses are present during the period of the duty cycle [15,19].…”

Section: Duty Cycle and Conduction Lossesmentioning

confidence: 99%

“…Depending on the shape of the AC output voltage generated by the inverter there exist three main types of single phase stand-alone photovoltaic inverters: pure sinewaveform inverters, modulated waveform inverters and square waveform inverters [13][14][15] and each type of these inverters is also divided into different topologies: half bridge and full bridge for the square waveform inverters and multilevel (bridges) for the modulated waveform and the pure sinewave inverters. Square waveform inverters are designed to feed loads which have an important inductance [6] as motors because inductive loads allow having relatively pure sinewave current.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A comparison of single phase standalone square waveform solar inverter topologies: half bridge and full bridge

Chemseddine¹,

Benabadji²,

Cheknane³

et al. 2020

IJECE

View full text Add to dashboard Cite

In stand-alone photovoltaic installations the photovoltaic inverter allows transforming the DC power produced by the photovoltaic modules into an AC power. Depending on the shape of the AC output voltage generated by the inverter there exist three main types of stand-alone PV inverters: pure sine waveform inverters, modulated sine waveform inverters and square waveform inverters and each type of these inverters is also divided into different topologies. In this paper we will be interested and study the square waveform stand-alone inverter topologies which are the half bridge and the full-bridge inverter topologies.

show abstract

Section: Duty Cycle and Conduction Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison of single phase standalone square waveform solar inverter topologies: half bridge and full bridge

Chemseddine¹,

Benabadji²,

Cheknane³

et al. 2020

IJECE

View full text Add to dashboard Cite

show abstract

“…The voltage between the PV array and the ground is clamped. Therefore, the leakage current can be reduced [28][29][30][31][32]. The two-stage power conversion would be complicated and have a low efficiency.…”

Section: Conventional Current Source Invertermentioning

confidence: 99%

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

et al. 2018

View full text Add to dashboard Cite

A new single-phase transformerless current source inverter is proposed in this paper. The proposed inverter can achieve leakage current reduction, which is crucial for the conventional current source inverter. The basic concept of the proposed solution is to develop the new inverter by the duality principle from the voltage source inverter. The theoretical analysis is carried out to determine the switching states of the proposed inverter for the leakage current reduction. Also, a new modulation strategy is presented to achieve the optimized switching states. Finally, the experimental results are presented. Comparing with conventional single-phase current source inverter, the leakage current can be significantly reduced by the proposed inverter, which verifies the effectiveness of the proposed solution.

show abstract

“…This can be achieved by either adding an auxiliary power decoupling stage connected in series [9] or parallel [10] to the main inverter, or allowing higher ripple on the main dc-link [11], [12]. However, in the later case the control needs to be properly designed such that the ripple on the dc-link does not impact the output grid current [13].…”

Section: Introductionmentioning

confidence: 99%

“…This is commonly termed as the doubly grounded or common ground structure as adopted in a few recent works both related to string inverter [14]- [16] as well as microinverter [17], [18] applications. The presented circuit is a topological enhancement to [13] leading to a significant improvement in the converter efficiency. Unlike the conventional T-type converters, it does not pose any HB voltage balancing issue, as the voltage is inherently balanced without losing any modulation freedom in the inverter stage.…”

Section: Introductionmentioning

confidence: 99%

A Single Stage Common Ground Three-Level PV Inverter With Integrated Power Decoupling

Xia

Roy

2020

IEEE Open J. Power Electron.

Self Cite

View full text Add to dashboard Cite

In this paper, a T-type common ground transformerless single phase inverter with dynamic swing of the dc-link voltage is presented for photovoltaic (PV) application. The topology is a combination of a bi-directional, partial-powerprocessing boost stage and an asymmetric half-bridge inverter stage along with a T-branch. It takes advantage of the three-level switching states with reduced voltage stress on the main switches to achieve lower switching loss and almost one-half the inductor current ripple w.r.t. two level implementation. The double line frequency power decoupling is addressed by a dynamic dclink approach, which allows a large swing of the dc-link to reduce the decoupling capacitor requirement, enabling an allfilm capacitor implementation. This topology also significantly reduces the high-frequency capacitive coupled ground current by directly connecting the PV negative terminal to the grid neutral. Moreover, an adaptive dc-link voltage control scheme that optimally changes the average value of the dc-link voltage as the operating conditions (load and power factor) vary, has been proposed and thoroughly investigated from the perspective of better utilization of passive components and further reduction of switching losses. A SiC MOSFETs-based 1 kVA laboratory prototype has been built to validate the converter's operation at 200 V dc nominal input and 120 V/60 Hz ac nominal output with a wide range of power factor and load operations. Extensive experimental results validate the superior performance of the topology with the adaptive dc-link voltage control implementation showing a peak efficiency of 98.22% and a CEC efficiency of 98.03% at 50 kHz switching frequency.

show abstract

A Capacitance-Minimized, Doubly Grounded Transformer less Photovoltaic Inverter With Inherent Active-Power Decoupling

Cited by 120 publications

References 42 publications

A comparison of single phase standalone square waveform solar inverter topologies: half bridge and full bridge

A comparison of single phase standalone square waveform solar inverter topologies: half bridge and full bridge

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

A Single Stage Common Ground Three-Level PV Inverter With Integrated Power Decoupling

Contact Info

Product

Resources

About