NDLI: Design methodology of a passive damped modified LCL filter for leakage current reduction in grid-connected transformerless three-phase PV inverters

Content Provider	IET Digital Library
Author	Giacomini, Julian C. Michels, Leandro Pinheiro, Humberto Rech, Cassiano
Abstract	Although grid-connected transformerless photovoltaic (PV) inverters present higher efficiency and power density compared with inverters with a transformer, the leakage current caused by the inverter common-mode voltage introduces several problems. Among the techniques to reduce the leakage current, the modified LCL (MLCL) filter with passive damping is an effective and simple solution. However, the classical design of the filter damping resistance is not adequate for ensuring both proper leakage current attenuation and control system stability. Therefore, this study proposes a methodology to design the resistance in a low-loss passive damping structure applied to the MLCL filter. In addition to the conventional specifications for LCL-type filters, this study includes the leakage current limit in the design procedure. Simulation and experimental results for a 10 kW PV inverter show the damping resistance impact on the leakage current. The results related to the efficiency and grid inductance variation are also presented. Therefore, it is possible to conclude that the proposed design methodology is very useful for obtaining a damping resistance that ensures control system stability and a leakage current in conformity with PV standards.
Starting Page	1769
Ending Page	1777
Page Count	9
ISSN	17521416
Volume Number	11
e-ISSN	17521424
Issue Number	Issue 14, Dec (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/11/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2017.0256
Journal	IET Renewable Power Generation
Publisher Date	2017-08-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control System Stability Design Methodology Filter Damping Resistance Grid Inductance Variation Grid-connected Transformerless Photovoltaic Inverter Grid-connected Transformerless Three-phase PV Inverter Inverter Common-mode Voltage Invertors Leakage Current Leakage Current Attenuation Leakage Current Reduction Low-loss Passive Damping Structure MLCL Filter Other Power Apparatus And Electric Machine Passive Damped Modified LCL Filter Passive Filter Photovoltaic Power System Power 10 KW Power Density Power Filter Power Grid Solar Power Stations
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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