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Control of three-phase converters for grid-connected renewable energy systems using feedback linearization technique

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4 Author(s)
Masoud Karimi-Ghartemani ; Department of Electrical and Computer Engineering, Queens University, Kingston, Ontario, Canada ; S. Ali Khajehoddin ; Praveen Jain ; Alireza Bakhshai

This paper presents a control algorithm based on feedback linearization technique for grid-connected three-phase non-dispatchable distributed generation (DG) systems such as a wind or a solar based generator. The power electronic interface is a voltage source inverter (VSI) and the output low-pass filter is an inductance (L) or an inductance-capacitance-inductance (LCL) circuit. The control objectives are injection of quality active power to the grid, regulation of the dc-link voltage, and regulation of reactive power to their desired values in the presence of system uncertainties and disturbances. Unlike the conventional methods which linearize the equations to design a controller working at the operating point, the proposed method of this paper is based on using a set of state variables which makes the equations globally linear for all operating points. Moreover, the method completely decouples the reactive-power and dc-link voltage control loops. The design stage is simple and engages no trial and error in adjusting the controller gains. Simulation results are also provided to confirm analytical derivations.

Published in:

2010 IEEE International Symposium on Industrial Electronics

Date of Conference:

4-7 July 2010