Abstract
In this paper, a new reactive power compensation method with a state observer and repetitive control is proposed for voltage regulation of the low voltage distribution line. Reactive power compensator has a single-phase full bridge inverter structure and consists of DC link voltage controller to maintain a constant DC voltage and current controller to inject a reactive current for voltage regulation. A state observer is proposed to extract the second harmonic component of the DC link voltage and then a dc component, which is calculated by eliminating the DC link ripple component, is applied as the voltage controller feedback component. By using the state observer, the feedback 120 Hz DC link voltage ripple component inherited in the single-phase system is reduced to 2V from 66V in the peak-to peak magnitude. In order to inject a clean reactive current, PI controller is employed for the fundamental component control and a repetitive controller is connected in parallel with the PI controller to compensate for lower-order odd harmonics, where both controllers are implemented in the synchronous reference frame. The proposed control method is verified in a ±5kVar single-phase reactive power compensator by simulation and experiment, and shows that THD is reduced to 2% from 9% even in the small DC link capacitance.
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