An overview on prospects of new generation single-phase transformerless inverters for grid-connected photovoltaic (PV) systems

Shayestegan, Mohsen; Shakeri, Mohammad Taghi; Abunima, Hamza; Reza, Shamim; Akhtaruzzaman, Md.; Bais, Badariah; Mat, Sohif; Sopian, Kamaruzzaman; Amin, Nowshad

doi:10.1016/j.rser.2017.09.055

Cited by 45 publications

(30 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(vii) xf(pu)≤0.1pu in order to limit the AC voltage drop during operation, thus enhancing the dynamic response of the PV inverter [30]. (viii) the switching frequency is usually in the range for both converters composing the PVC [29]; it is used for the estimation of the range of coefficients, k 3 -k 11 with (A4), (A9) and (A10). The maximum value of the switching frequency is also limited by additional constraints on coefficients and mentioned below.…”

Section: B Determination Of Coefficients Following Technical Constramentioning

confidence: 99%

Estimation of Additional PV Converter Losses Operating Under PF ≠ 1 Based on Manufacturer's Data at PF = 1

Malamaki

Demoulias

2019

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

The increasing penetration of Photovoltaic (PV) systems in distribution networks often causes overvoltage problems. One solution to address this issue is the provision of reactive power (RP) by the PV converters. This can cause increased power losses on the PV converters leading to additional operational costs. However, the manufacturers of commercially available PV converters provide data regarding the converter losses only under unity power factor (PF). The data are also limited regarding the technical details of the PV converters. This paper presents a methodology to estimate analytically the power losses in two-stage PV converters under RP provision based on the efficiency curves at PF=1 for different PV voltages and the limited information given in the PV converter datasheet. The losses are separately estimated for the DC/DC converter and the DC/AC inverter, because the losses on the former are not affected by the RP, while the losses on the latter are. The method is validated with field measurements of PV converter losses under RP provision and with detailed simulations.

show abstract

Section: B Determination Of Coefficients Following Technical Constramentioning

confidence: 99%

Estimation of Additional PV Converter Losses Operating Under PF ≠ 1 Based on Manufacturer's Data at PF = 1

Malamaki

Demoulias

2019

IEEE Trans. Energy Convers.

View full text Add to dashboard Cite

show abstract

“…Electronics 2019, 8, x FOR PEER REVIEW 2 of 9 [13][14][15][16]. Moreover, also the inverter efficiency typically depends on the delivered power level [17][18][19]. This work aims at demonstrating the importance of taking into account the dependence of the efficiency on the output power of batteries and inverters when defining management strategies for battery-based storage systems interfaced with the distribution grid.…”

Section: Fundamentals Of Proposed Management Strategymentioning

confidence: 99%

“…In both the plots of Figures 1 and 2, the efficiency is reported as a function of the output power normalized with respect to the maximum output. The curve of Figure 1 was constructed by considering typical efficiency profiles of commercial inverters, in which the efficiency usually degrades at low output power levels because of switching and conducting power losses in the circuit elements of the inverter [17][18][19]. The curve of Figure 1 was constructed by considering typical efficiency profiles of commercial inverters, in which the efficiency usually degrades at low output power levels because of switching and conducting power losses in the circuit elements of the inverter [17][18][19].…”

Section: Fundamentals Of Proposed Management Strategymentioning

confidence: 99%

“…The product between the two profiles of Figures 1 and 2 results in the overall charging/discharging efficiency profile reported in Figure 3, which achieves a maximum efficiency of about 90% when the output power is about 40% of the maximum power. The curve of Figure 1 was constructed by considering typical efficiency profiles of commercial inverters, in which the efficiency usually degrades at low output power levels because of switching and conducting power losses in the circuit elements of the inverter [17][18][19].…”

Section: Fundamentals Of Proposed Management Strategymentioning

confidence: 99%

“…However, the charging/discharging efficiency of a battery strongly depends on the charging/discharging rate used [13][14][15][16]. Moreover, also the inverter efficiency typically depends on the delivered power level [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improved Efficiency Management Strategy for Battery-Based Energy Storage Systems

Arnieri¹,

Boccia²,

Amoroso³

et al. 2019

Electronics

View full text Add to dashboard Cite

Battery-based energy storage systems are forecasted to have a rapid diffusion in the next future, because they can support the diffusion of renewable energy sources and can offer interesting ancillary services for the distribution grid. Consequently, energy management strategies for batteries and inverters present in storage systems will play a fundamental role in order to guarantee effective energy transfer processes between storage systems and the grid. This paper proposes an efficient management strategy which allows maximizing the overall energy efficiency of grid-connected storage systems taking into account the actual relationship between the efficiency and the charging/discharging power of the storage system. The effectiveness of the strategy is as shown by analysis results, the proposed strategy can allow a remarkable efficiency increase compared with strategies which are not aimed at the efficiency optimization.

show abstract

An improved quasi Z‐source based H5 inverter with low leakage current for photovoltaic applications

Das

Kirubakaran

Tirumala

et al. 2021

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Grid-connected Single-Stage Boost Inverters (SSBI) are extensively being researched in the area of photovoltaic energy conversion systems. Owing to their single-stage boosting capability, this class of power converters results in higher efficiency and reliability. This power circuit configuration is constituted by two mutually dependent sub-converters, in that a front-end quasi-Z-source (qZS) part is integrated to a back-end multilevel inverter (MLI). The MLI provides the shootthrough state to the qZS, while the qZS provides the pulsating DC input to the MLI. In general, solar photovoltaic inverters suffer from the disadvantage of leakage current that flows from solar panels to the grid/load. This paper introduces a dual quasi-Z-source based multilevel inverter, which achieves the following benefits: (a) five-level output voltage, (b) reactive power capability, (c) shoot-through immunity, (d) continuous input current, and (e) reduced leakage current based on VDE 0126-1-1 standards. In this paper, a modified modulation scheme, which is based on the employment of phase-disposed and level-shifted carrier signals, has been used to reduce the leakage current. To reduce the leakage current further, a passive filter is employed to eliminate high frequency variations across the parasitic capacitance. The working principle of the proposed power converter and the effectiveness of the modulation scheme have been validated with simulation studies in both standalone and the grid-connected mode. Finally, the simulation studies are verified through an experimental prototype of 500 W rating.common mode voltage, leakage current, multilevel inverter, quasi Z-source, shoot-though LIST OF SYMBOLS AND ABBREVIATIONS: V IN , input voltage; V DC , boosted DC link voltage; V O , output voltage; D S , shoot through duty cycle; m, modulation index; V C1 , voltage across capacitor 1; V C2 , voltage across capacitor 2; V CMV , common mode voltage; V CPAR , voltage across parasitic capacitance; i LEAK , leakage current; B, boost factor; i L1 , current through inductor 1; P O , output power; k C1 , ripple across capacitor 1; k C2 , ripple across capacitor 2; k L , ripple through inductor current; VDC , peak DC link voltage; L, inductor; C, capacitor; C f , filter capacitor; L f , filter inductor; CMV, common mode voltage;

show abstract

An overview on prospects of new generation single-phase transformerless inverters for grid-connected photovoltaic (PV) systems

Cited by 45 publications

References 46 publications

Estimation of Additional PV Converter Losses Operating Under PF ≠ 1 Based on Manufacturer's Data at PF = 1

Estimation of Additional PV Converter Losses Operating Under PF ≠ 1 Based on Manufacturer's Data at PF = 1

Improved Efficiency Management Strategy for Battery-Based Energy Storage Systems

An improved quasi Z‐source based H5 inverter with low leakage current for photovoltaic applications

Contact Info

Product

Resources

About