Integrating Two Stages as a Common-Mode Transformerless Photovoltaic Converter

Vázquez, N.; Vázquez, Jeziel; Vaquero, Joaquín; Hernandez, C.; Vázquez, Eslí; Osorio, R.

doi:10.1109/tie.2017.2682014

Cited by 80 publications

(61 citation statements)

References 32 publications

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“…By substituting (11), (12), and (13) in (14), the final equation of T S (θ) can be obtained as presented in (15). It is obvious from the equation derived for T S (θ) that the switching frequency in theoretical analysis is variable.…”

Section: Analysis Of Different Parametersmentioning

confidence: 99%

“…Till now, the discussed topologies in previous studies [3][4][5][6][7][8][9][10][11][12][13][14] do not have the soft switching ability and suffer from switching losses, where they do not have proper efficiency in high switching frequencies. Therefore, some soft-switched transformer-less grid-tied inverters have been presented recently to diminish the switching losses.…”

Section: Introductionmentioning

confidence: 99%

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Single‐phase common mode transformer‐less soft‐switching grid‐connected inverter with eliminated leakage current

Azary

Sabahi

Babaei

2019

Circuit Theory & Apps

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Summary In this paper, a single‐phase single‐stage soft‐switching transformer‐less grid‐tied common mode inverter is proposed, which is useful for injection of power from the photovoltaic (PV) panels to the grid. One of the output ports of the PV panel in the proposed topology can be connected directly to the neutral point of the grid to eliminate the leakage current. The proposed topology has buck‐boost ability, besides soft switching capability to have a proper efficiency. Furthermore, the proposed converter can operate in unity power factor, therefore the proposed converter has most of the features needed for a PV inverter. A full analysis of the converter is done. Also, a suitable switching algorithm for correct operation of the converter is presented. Moreover, the design technique for the passive elements of the topology is demonstrated. The voltage gain of the converter is calculated. The leakage current of the proposed inverter due to the low‐ and high‐frequency voltage ripple of the PV panel has been discussed. Simulation results in PSCAD EMTDC plus experimental results from a laboratory prototype are added to substantiate the theoretical results. Eventually, a comprehensive comparison study is presented to compare the proposed topology with the most similar converters.

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Section: Analysis Of Different Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single‐phase common mode transformer‐less soft‐switching grid‐connected inverter with eliminated leakage current

Azary

Sabahi

Babaei

2019

Circuit Theory & Apps

View full text Add to dashboard Cite

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“…In the current market, the distributed residential grid-connected PV systems that have the characteristic of non-isolation and low power include two stages with Boost converter and single-phase inverter [11], as shown in Figure 1. In this system, the Boost circuit mainly completes the MPPT function.…”

Section: Analysis Of CM Loop Modelsmentioning

confidence: 99%

Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System

2018

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The existence of high-frequency components in common-mode (CM) current would reduce the stability of a non-isolated PV grid-connected system. It has great impacts on the output power quality when the generated power from PV is low. The method of single CM inner loop in suppressing the high-frequency components has poor effect. Based on the CM equivalent circuit model and the cause analysis of the CM current, a novel dual CM inner loops method is proposed to restrain the high-frequency components in CM current. This method not only meets the grid connection demand of CM current, but also overcomes the high frequency resonant problem. Furthermore, the high-frequency components in CM current from the outer parasitic circuit are substantially reduced. Finally, the proposed method is verified by simulation and experimental results.

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“…Finally, other solutions propose the direct connection of the negative terminal of PV to the neutral line of the grid, referred here as common mode (CM). Such a configuration is proposed in [22]. It is worth mentioning that all these topologies are voltage source inverters (VSI).…”

Section: Introductionmentioning

confidence: 99%

A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications

et al. 2018

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Low power grid-tied photovoltaic (PV) generation systems increasingly use transformerless inverters. The elimination of the transformer allows smaller, lighter and cheaper systems, and improves the total efficiency. However, a leakage current may appear, flowing from the grid to the PV panels through the existing parasitic capacitance between them, since there is no galvanic isolation. As a result, electromagnetic interferences and security issues arise. This paper presents a novel transformerless single-phase Current Source Inverter (CSI) topology with a reduced inductor, compared to conventional CSIs. This topology directly connects the neutral line of the grid to the negative terminal of the PV system, referred as common mode configuration, eliminating this way, theoretically, the possibility of any leakage current through this terminal. The switches control is based on a hysteresis current controller together with a combinational logic circuitry and it is implemented in a digital platform based on National Instruments Technology. Results that validate the proposal, based on both simulations and tests of a low voltage low power prototype, are presented.

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Integrating Two Stages as a Common-Mode Transformerless Photovoltaic Converter

Cited by 80 publications

References 32 publications

Single‐phase common mode transformer‐less soft‐switching grid‐connected inverter with eliminated leakage current

Single‐phase common mode transformer‐less soft‐switching grid‐connected inverter with eliminated leakage current

Novel Common-Mode Current Suppression Method in Transformerless PV Grid-Connected System

A Transformerless Single-Phase Current Source Inverter Topology and Control for Photovoltaic Applications

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