Title :
Negative output impedance in three-phase grid-connected renewable energy source inverters based on reduced-order model
Author :
Puukko, J. ; Messo, T. ; Nousiainen, L. ; Huusari, J. ; Suntio, T.
Author_Institution :
Dept. of Electr. Energy Eng., Tampere Univ. of Technol., Tampere, Finland
Abstract :
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.
Keywords :
invertors; maximum power point trackers; power grids; power system control; renewable energy sources; cascaded control systems; grid connected renewable energy source; grid-parallel inverters; inherent property; interfacing renewable energy sources; maximum power point tracking; negative output impedance; power grid; reduced-order model; stability; three-phase renewable energy source; Photovoltaic; VSI; grid-parallel operation; inverter; negative output impedance;
Conference_Titel :
Renewable Power Generation (RPG 2011), IET Conference on
Conference_Location :
Edinburgh
DOI :
10.1049/cp.2011.0128
