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A state-space approach to the integration of detection and control for Shunt Active Power Filter

Shunt Active Power Filter (SAPF) with LCL output filter is a typical current tracking control system. This article explores a new control method for fast tracking of compensation current and suppressing its resonance. The state-space model is first established in the synchronous rotating d-q coordinate, which can make the active and reactive power components decoupled, and at the same time the harmonic current can be directly extracted, thus the harmonic detection and compensation control in the SAPF system are unified in the same realization. With the observer-based feedback, the dynamic response and stability of the system can be improved through pole placement in state feedback, while effectively suppressing resonance and reducing the damping loss. Simulation results are given to verify the effectiveness of the system.