An Improved Hybrid-Bridge Transformerless Inverter Topology With Bidirectional Clamping and Reactive Power Capability

Transformerless inverters are getting popular in distributed photovoltaic power generation (PVPG) system due to its light weight, low cost, and higher efficiency in power conversion. However, the production of leakage current leads to severe electromagnetic interference and operational insecurity, w...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2019-11, Vol.55 (6), p.7400-7409
Main Authors: Kuncham, Sateesh Kumar, Annamalai, Kirubakaran, Nallamothu, Subrahmanyam
Format: Article
Language:English
Subjects:
Bridge construction
Bridge maintenance
Capacitance
Clamping
Clamps
Common-mode voltage (CMV)
Computer simulation
Electric potential
Electric power distribution
Electric power generation
Electromagnetic interference
Energy conversion efficiency
Inverters
Leakage current
Leakage currents
Reactive power
reactive power capability
Switches
Topology
transformerless inverter(TLI)
Variations
Voltage
Waveforms
Weight reduction
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Summary:Transformerless inverters are getting popular in distributed photovoltaic power generation (PVPG) system due to its light weight, low cost, and higher efficiency in power conversion. However, the production of leakage current leads to severe electromagnetic interference and operational insecurity, which declines the reliability and efficiency of the overall system. Besides that many of the topologies have been addressed with real power injection capabilities in the literature. Therefore, in this paper, an improved hybrid-bridge (IH-B) inverter for transformerless PVPG system is proposed with 1) reduced leakage current by abolishing the fluctuations in common-mode voltage (CMV) due to switch junction capacitances and 2) reactive power capability with a modified sinusoidal pulsewidth modulation technique. This topology is constructed with the combination of bidirectional clamping branch and hybrid-bridge (H-B) inverter topology to maintain CMV at half of the dc-link voltage and ensure better quality of output waveforms at different power factors of the grid. Further, MATLAB simulation results of the IH-B and H-B topologies are presented and compared to prove the potential benefits of the proposed topology. Finally, a 500W prototype model is built and tested to validate the effectiveness of the IH-B topology in reduction of leakage current and reactive power capability.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2019.2920222