Leakage current minimization techniques for single-phase transformerless grid-connected PV inverters — An overview

Figueredo, Ricardo Souza; Carvalho, Kelly Caroline Mingorancia de; Ama, Naji Rajai Nasri; Matakas, Lourenco

doi:10.1109/cobep.2013.6785164

Cited by 21 publications

(15 citation statements)

References 21 publications

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“…In the given system, a damping resistor R CM2 is connected between grid and neutral point capacitor. Additionally, two chokes, L CM1 and L CM2 , and three Y-connected capacitors, C CM2 , are connected for filter purposes [12][13][14]. R CM1 and C CM1 are connected between the grid and negative terminal of the DC link.…”

Section: Filtering Of Common Mode Voltagementioning

confidence: 99%

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Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

et al. 2019

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Power inverters produce common mode voltage (CMV) and common mode current (CMC) which cause high-frequency electromagnetic interference (EMI) noise, leakage currents in electrical drives application and grid-connected systems, which consequently drops the efficiency of the system considerably. This CMV can be mitigated by designing suitable EMI filters and/or investigating the effects of different modulation strategies. In this paper, the effect of various modulation techniques over CMV and CMC are investigated for two-level and three-level inverters. It is observed that the modified third harmonic injection method reduced the CMV and CMC in the system by 60%. This modified pulse width modulation (PWM) technique is employed along with EMI chokes which results in reduced distortion of the system.

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Section: Filtering Of Common Mode Voltagementioning

confidence: 99%

“…The CM loop impedance can be increased in order to suppress current in CM loop effectively. In [13], the mid-point of DC and AC side voltage nodes are connected to the proposed new CM internal loop scheme in order to suppress CMC. In [14], a novel modulation scheme is presented to control inverter power switches in order to reduce CMC.…”

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confidence: 99%

Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

et al. 2019

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“…In three phase motor drive system the passive common mode filter has been widely used [14] and its application in grid-connected PV system is also researched recently [15] [16]. Fig.…”

Section: Leakage Current Supression With Bypass Capacitormentioning

confidence: 99%

Leakage current suppression for transformerless ZVS full-bridge inverter

Chen

2014

2014 International Power Electronics and Application Conference and Exposition

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Leakage current suppression for a transformerless zero voltage switching (ZVS) full-bridge inverter is investigated. The leakage current model and the common mode voltage of the ZVS full-bridge inverter are analyzed. The leakage current flowing through the parasitic capacitor between PV panels and the ground is reduced by a common mode inductor and the bypass capacitors. The theoretical analysis of proposed method is presented. Finally the leakage current suppression is verified by simulation and experiment.

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“…In recent years, some scholars have proposed to set CM internal loop at the output side of the system to suppress CM current. In [8], a CM internal loop is proposed by connecting the midpoint of ac side voltage to the dc side voltage point. In [9], a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters to reduce CM current.…”

Section: Introductionmentioning

confidence: 99%

“…In [10], the RC absorption branch is added between the output terminal and the dc negative bus to form a single CM internal loop. However, there is no further analysis of CM current in [8][9][10], and there is no comparative analysis of the effect of CM internal loop on the high frequency component of the CM current. Furthermore, it is easy to produce high frequency resonance in the CM circuit by using the single CM internal loop method so that the large CM current of the resonant frequency will be produced.…”

Section: Introductionmentioning

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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Leakage current minimization techniques for single-phase transformerless grid-connected PV inverters — An overview

Cited by 21 publications

References 21 publications

Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

Investigations on EMI Mitigation Techniques: Intent to Reduce Grid-Tied PV Inverter Common Mode Current and Voltage

Leakage current suppression for transformerless ZVS full-bridge inverter

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

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