Full-state feedback equivalent controller for active damping in LCL filtered Grid Connected Inverters using a reduced number of sensors

C. BUSADA; S. GÓMEZ JORGE; J. SOLSONA

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2015 vol. 62 p. 5993 - 6002

0278-0046

This paper presents a method for the active damping of a grid-tie LCL inverter. This method is based solely on the feedback of the injected current into the grid, and is applicable to any linear current controller. It requires a low additional computational load over that required to control a grid-tie L inverter, and the same measurements. A general design methodology for the current controller, which allows positioning all the closed loop poles of the system at arbitrary locations (even unstable modes of the LCL filter), is proposed. Stability and robustness of the resulting system is analyzed. Simulation and experimental results that validate the proposal are presented.