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A Multilevel Transformerless Inverter Employing Ground Connection Between PV Negative Terminal and Grid Neutral Point
- Source :
- IndraStra Global.
- Publication Year :
- 2017
- Publisher :
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2017.
-
Abstract
- For the safe operation of transformerless grid connected photovoltaic (PV) inverters, the issue of common mode (CM) leakage current needs to be addressed carefully. In this paper, a novel multilevel transformerless inverter topology is proposed, which completely eliminates CM leakage current by connecting grid neutral point directly to the PV negative terminal, thereby bypassing the PV stray capacitance. It provides a low-cost solution consisting of only four power switches, two capacitors, and a single filter inductor. As compared to half-bridge topologies, with this inverter a minimum of 27% and maximum of 100% more output voltage is obtained for the same dc-link voltage. The proposed inverter is analyzed in detail and its switching pattern to generate multilevel output while maintaining the capacitor voltage is discussed. Simulations and experiments results confirm the feasibility and good performance of the proposed inverter.
- Subjects :
- Engineering
020209 energy
02 engineering and technology
Inductor
Common Mode (Cm) Current
Maximum power point tracking
law.invention
Parasitic capacitance
law
Multilevel Inverter
0202 electrical engineering, electronic engineering, information engineering
Grid-connected photovoltaic power system
Grid-tie inverter
Electrical and Electronic Engineering
Photovoltaic (Pv) System
business.industry
020208 electrical & electronic engineering
Photovoltaic system
Electrical engineering
Systems
Transformerless Inverter
Capacitor
Control and Systems Engineering
Inverter
business
Photovoltaic Inverters
Subjects
Details
- Language :
- English
- ISSN :
- 23813652
- Database :
- OpenAIRE
- Journal :
- IndraStra Global
- Accession number :
- edsair.doi.dedup.....c3554650040d1d3542641cc3d0f4feac
- Full Text :
- https://doi.org/10.1109/TIE.2017.2696460