A modified carrier-based PWM technique for minimization of leakage current in transformer less single-phase grid-tied PV
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ORIGINAL PAPER
A modified carrier-based PWM technique for minimization of leakage current in transformer less single-phase grid-tied PV system Subhendu Bikash Santra1 · Anupam Acharya1 · Tanmoy Roy Choudhury1 Chinmoy Kumar Panigrahi1
· Byamakesh Nayak1
·
Received: 22 May 2019 / Accepted: 12 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This paper discusses the impact of leakage current and its dependency on common mode voltage in transformer less singlephase grid connected photovoltaic (PV) system. Further a new carrier-based PWM method is derived for H bridge single-phase grid-tied PV inverter to minimize leakage current. The proposed modulation strategy is compared with conventional techniques through simulation in MATLAB R2018a. The superiority of the proposed technique is validated in laboratory prototype of a 500 W single-phase grid-tied PV system. The hardware results validate the theoretical findings in appropriate. Keywords Common mode voltage (V CM ) · Leakage current · Parasitic capacitance · Transformer less PV system
Abbreviations MPPT THD LRPWM PSPWM EMI HMCPWM CM DM SPWM POD SHEPWM RMS MLI PV
Maximum power point tracking Total harmonic distortion Leakage reduction pulse width modulation Phase shifted pulse width modulation Electromagnetic interference Hybrid multicarrier pulse width modulation Common mode Differential mode Sinusoidal pulse width modulation Phase opposition disposition Selective harmonics elimination pulse width modulation Root-mean-square Multilevel inverter Photovoltaic
List of symbols V g (t) L1 , L2
B 1
Grid voltage Line Inductances
Subhendu Bikash Santra [email protected] School of Electrical Engineering, KIIT University, Bhubaneswar, Odisha 751024, India
C dc V cdc (t) C pv1 , C pv2 V cm V dm Rg I leakage Pg S1 , S3 V PV C 1g C dc1 C dc2 V cdc1 (t) V cdc2 (t) X1 X2 m V AN V BN Qg S2 , S4 C 2g V total_CM
Common dc link capacitance Common dc link voltage Stray PV capacitances Common mode voltage Differential mode voltage Ground resistance Leakage Current Active power Top MOSFET switches PV Terminal voltage Stray capacitance between inverter terminal to ground Top capacitance in common dc link Bottom capacitance in common dc link Top capacitance voltage Bottom capacitance voltage Ripple voltage magnitude of top capacitance Ripple voltage magnitude of bottom capacitance Modulation index Inverter voltage from node A Inverter voltage from node B Reactive Power Bottom MOSFET switches Stray capacitance between inverter terminal to ground Total common mode voltage
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Electrical Engineering
1 Introduction Environmental organizations encourage power industries to focus on usage of renewable and alternate power sources for clean power generation to combat climate change. Photovoltaic (PV) power is widely used and accepted solution for renewable power generation because of its installation modularity, easy maintenance and static noise less operation [1]. There are different configurations of PV installation like series, paralle
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