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Proceedings Paper

High efficiency H6 single-phase transformerless grid-tied PV inverter with proposed modulation for reactive power generation
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Paper Abstract

Implementation of transformerless inverters in PV grid-tied system offer great benefits such as high efficiency, light weight, low cost, etc. Most of the proposed transformerless inverters in literature are verified for only real power application. Currently, international standards such as VDE-AR-N 4105 has demanded that PV grid-tied inverters should have the ability of controlling a specific amount of reactive power. Generation of reactive power cannot be accomplished in single phase transformerless inverter topologies because the existing modulation techniques are not adopted for a freewheeling path in the negative power region. This paper enhances a previous high efficiency proposed H6 trnasformerless inverter with SiC MOSFETs and demonstrates new operating modes for the generation of reactive power. A proposed pulse width modulation (PWM) technique is applied to achieve bidirectional current flow through freewheeling state. A comparison of the proposed H6 transformerless inverter using SiC MOSFETs and Si MOSFTEs is presented in terms of power losses and efficiency. The results show that reactive power control is attained without adding any additional active devices or modification to the inverter structure. Also, the proposed modulation maintains a constant common mode voltage (CM) during every operating mode and has low leakage current. The performance of the proposed system verifies its effectiveness in the next generation PV system.

Paper Details

Date Published: 23 August 2017
PDF: 13 pages
Proc. SPIE 10381, Wide Bandgap Power Devices and Applications II, 103810D (23 August 2017); doi: 10.1117/12.2275572
Show Author Affiliations
Fahad M. Almasoudi, Univ. of Denver (United States)
Khaled S. Alatawi, Univ. of Denver (United States)
Mohammad Matin, Univ. of Denver (United States)

Published in SPIE Proceedings Vol. 10381:
Wide Bandgap Power Devices and Applications II
Mohammad Matin; Srabanti Chowdhury; Achyut K. Dutta, Editor(s)

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