TY - GEN
T1 - An adaptive controller for inverter-interfaced DGs connected to grids with a wide range of unknown impedances
AU - Mao, Xiaolin
AU - Ayyanar, Raja
PY - 2010/12/20
Y1 - 2010/12/20
N2 - Significantly degraded dynamic performance, or even instability, can occur when connecting a distributed generator interfaced through an inverter to a grid whose impedance is significantly different than the one that the inverter is designed for. Previous solutions in the literature require measurement of the grid impedance and re-engineering of the inverter controller. In this paper, a novel, adaptive current control is proposed. It employs an embedded Model Reference Adaptive Control that turns the plant model with uncertainties into a known, desired model. Consequently, the controller can self-adapt to a wide range of grid impedances without problems of instability and degradation of dynamic performance. This allows mass manufactured inverters of a single design to be connected to grids of different stiffness. The design of the proposed controller and simulation verification results are presented.
AB - Significantly degraded dynamic performance, or even instability, can occur when connecting a distributed generator interfaced through an inverter to a grid whose impedance is significantly different than the one that the inverter is designed for. Previous solutions in the literature require measurement of the grid impedance and re-engineering of the inverter controller. In this paper, a novel, adaptive current control is proposed. It employs an embedded Model Reference Adaptive Control that turns the plant model with uncertainties into a known, desired model. Consequently, the controller can self-adapt to a wide range of grid impedances without problems of instability and degradation of dynamic performance. This allows mass manufactured inverters of a single design to be connected to grids of different stiffness. The design of the proposed controller and simulation verification results are presented.
KW - Adaptive control
KW - Instability
KW - Model reference adaptive control
KW - PV inverter
KW - Weak grid
UR - http://www.scopus.com/inward/record.url?scp=78650149124&partnerID=8YFLogxK
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U2 - 10.1109/ECCE.2010.5618187
DO - 10.1109/ECCE.2010.5618187
M3 - Conference contribution
AN - SCOPUS:78650149124
SN - 9781424452866
T3 - 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
SP - 2871
EP - 2877
BT - 2010 IEEE Energy Conversion Congress and Exposition, ECCE 2010 - Proceedings
T2 - 2010 2nd IEEE Energy Conversion Congress and Exposition, ECCE 2010
Y2 - 12 September 2010 through 16 September 2010
ER -