Design and Implementation of a Robust Current Controller for VSI Connected to the Grid Through an LCL Filter

This paper describes the design and implementation of a discrete controller for grid-connected voltage-source inverters with an LCL filter usually found in wind power generation systems. First, a theorem that relates the controllability of the discrete dynamic equation of the inverter with LCL filte...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2009-06, Vol.24 (6), p.1444-1452
Main Authors: Gabe, I.J., Montagner, V.F., Pinheiro, H.
Format: Article
Language:English
Subjects:
Applied sciences
Asymptotic properties
Control systems
Controllability
Convertors
Design engineering
Direct energy conversion and energy accumulation
Dynamical systems
Dynamics
Electric power
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electrical power engineering
Electricity generation
Electronics
Energy
Equations
Exact sciences and technology
Filters
Frequency
Grid-connected inverters
Inverters
LCL filters
linear matrix inequalities
Mathematical models
Miscellaneous
Natural energy
partial state feedback
pulsewidth-modulation (PWM) converters
Regulation and control
Robust control
Sampling methods
Theorems
Voltage control
Wind energy
Wind power generation
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Summary:This paper describes the design and implementation of a discrete controller for grid-connected voltage-source inverters with an LCL filter usually found in wind power generation systems. First, a theorem that relates the controllability of the discrete dynamic equation of the inverter with LCL filter and the sampling frequency is derived. Then, a condition to obtain a partial state feedback controller robust to grid impedance uncertainties and based on linear matrix inequalities is proposed. This controller guarantees the stability and damping of the LCL filter resonance for a large set of grid conditions without requiring self-tuning procedures. Finally, an internal model controller is added to ensure asymptotic reference tracking and disturbance rejection, significantly reducing the impact of grid background voltage distortion on the output currents. Experimental results are presented to support the theoretical analysis and to demonstrate the system performance.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2009.2016097