Pole-placement based active damping algorithm in current controllers with LCL-filtered power converters.

In this paper, a novel active damping technique is proposed that can be applied in AC power converters with LCL filters. Active damping is performed in the discrete domain based on a single measurement of the output LCL filter current. The parameter tuning procedure, which is based on pole-placement, is applied in a new active damping structure. This simplifies the design of the cascaded control loop, which is superimposed onto the inner loop with the active damping, which results in improved controller dynamics and robustness. The proposed active damping method is applied with the cascaded-output current controller main loop of an AC power converter with a resonant LCL filter. The dynamic performance and robustness of the novel active damping method are analyzed through a series of simulation and experimental tests. Simulation and experimental results show that proposed active damping technique enables successful and effective decoupling of the local active damping and the main control loop design. [ABSTRACT FROM AUTHOR]