TY - GEN
T1 - Natural adaptive observers-based estimation unit for robust grid-voltage sensorless control characteristics in inverter-based DG units
AU - Mohamed, Yasser A.R.I.
AU - El-Saadany, Ehab F.
AU - El-Shatshat, Ramadan A.
PY - 2007
Y1 - 2007
N2 - This paper presents a natural adaptive observersbased estimation unit for robust grid-voltage sensorless control characteristics in inverter-based distributed generation (DG) units. First, a rigorous discrete-time model of a current-controlled inverter-based DG unit, including the calculation delay and the nature of the pulse-width-modulation (PWM) as a zero-order-hold, is presented. Second, a novel estimation unit is designed with low computational demand to estimate, in the real-time, the interfacing parameters and the grid voltage simultaneously. A unified solution to the present nonlinear estimation problem is presented by adopting a parallel observers structure. Third, the estimated quantities are utilized within the inner high bandwidth current control loop and the outer power controller to realize a robust grid-voltage sensorless interfacing scheme. Theoretical analysis and evaluation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme.
AB - This paper presents a natural adaptive observersbased estimation unit for robust grid-voltage sensorless control characteristics in inverter-based distributed generation (DG) units. First, a rigorous discrete-time model of a current-controlled inverter-based DG unit, including the calculation delay and the nature of the pulse-width-modulation (PWM) as a zero-order-hold, is presented. Second, a novel estimation unit is designed with low computational demand to estimate, in the real-time, the interfacing parameters and the grid voltage simultaneously. A unified solution to the present nonlinear estimation problem is presented by adopting a parallel observers structure. Third, the estimated quantities are utilized within the inner high bandwidth current control loop and the outer power controller to realize a robust grid-voltage sensorless interfacing scheme. Theoretical analysis and evaluation results are provided to demonstrate the validity and usefulness of the proposed interfacing scheme.
KW - Deadbeat current control
KW - Digital current control
KW - Grid -voltage sensorless control
KW - Parameter estimation
KW - Pulse-width modulated inverters
UR - http://www.scopus.com/inward/record.url?scp=42549109981&partnerID=8YFLogxK
U2 - 10.1109/PES.2007.385690
DO - 10.1109/PES.2007.385690
M3 - Conference contribution
AN - SCOPUS:42549109981
SN - 1424412986
SN - 9781424412983
T3 - 2007 IEEE Power Engineering Society General Meeting, PES
BT - 2007 IEEE Power Engineering Society General Meeting, PES
T2 - 2007 IEEE Power Engineering Society General Meeting, PES
Y2 - 24 June 2007 through 28 June 2007
ER -