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This paper presents a method for current controller design in a single phase grid-connected inverter (GCI). The proposed controller addresses the following items: transient performance; steady state tracking; output current distortions and dc; active damping; and start-up transient. The proposed controller is based on various extensions of the linear quadratic regulator (LQR) method and it inherits the optimality and robustness features of the LQR. A design algorithm is proposed that offers a very systematic method of designing controller gains to achieve all the above control objectives. Simulation and experimental results are presented to illustrate performance of the proposed method.
Khajehoddin et al. (Sat,) studied this question.