Negative output impedance in three-phase grid connected renewable energy source inverters based on reduced-order model

Cascaded control systems are usually adopted in interfacing renewable energy sources to the power grid for maximum power point tracking purposes. This paper reveals that negative output impedance behaviour is an inherent property of such grid-parallel inverters. It is an alarming observation since n...

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Bibliographic Details
Main Authors: Puukko, J, Messo, T, Nousiainen, L, Huusari, J, Suntio, T
Format: Conference Proceeding
Language:English
Subjects:
Control of electric power systems
Power convertors and power supplies to apparatus
Power system control
Online Access:Get full text
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Summary:Cascaded control systems are usually adopted in interfacing renewable energy sources to the power grid for maximum power point tracking purposes. This paper reveals that negative output impedance behaviour is an inherent property of such grid-parallel inverters. It is an alarming observation since negative impedance reduces damping in the grid and will definitely cause stability concerns in the future. (6 pages)
DOI:10.1049/cp.2011.0128