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Electronics 2018, 7(8), 142; https://doi.org/10.3390/electronics7080142

High Frequency Transformer’s Parasitic Capacitance Minimization for Photovoltaic (PV) High-Frequency Link-Based Medium Voltage (MV) Inverter

1
School of Electrical Engineering, Pusan National University, Busandaehak-ro 63 beon-gil 2, Busan 46241, Korea
2
Institute of Robotics and Mechatronics, German Aerospace Center (DLR), 82234 Wessling, Germany
*
Author to whom correspondence should be addressed.
Received: 18 June 2018 / Revised: 4 August 2018 / Accepted: 6 August 2018 / Published: 8 August 2018
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Abstract

The high-frequency-based medium voltage (MV) inverter is used in renewable energy power sources for power transmission. However, power quality is compromised as a result of the increase in common mode noise currents by the high inter-winding parasitic capacitance in high-frequency link transformers. This fast voltage transient response leads to harmonic distortion and transformer overheating, which causes power supply failure or many other electrical hazards. This paper presents a comparative study between conventional and modified toroid transformer designs for isolated power supply. A half bridge high-frequency (10 kHz) MV DC–AC inverter was designed along with power source; a 680 W solar module renewable system was built. An FEM-simulation with Matlab-FFT analysis was used to determine the core flux distribution and to calculate the total harmonics distortion (THD). A GWInstek LCR meter and Fluke VT04A measured the inter-winding capacitance and temperature in all four transformer prototypes, respectively. The modified design of a toroid ferrite core transformer offers more resistance to temperature increase without the use of any cooling agent or external circuitry, while reducing the parasitic capacitance by 87%. Experiments were conducted along with a mathematical derivation of the inter-winding capacitance to confirm the validity of the approach. View Full-Text
Keywords: high-frequency-based MV inverter; transformer’s parasitic capacitance; total harmonic distortion; toroidal transformer; sector windings high-frequency-based MV inverter; transformer’s parasitic capacitance; total harmonic distortion; toroidal transformer; sector windings
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Himanshu; Singh, H.; Kumar, P.S.; Ali, M.U.; Lee, H.Y.; Khan, M.A.; Park, G.S.; Kim, H.-J. High Frequency Transformer’s Parasitic Capacitance Minimization for Photovoltaic (PV) High-Frequency Link-Based Medium Voltage (MV) Inverter. Electronics 2018, 7, 142.

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