带LCL滤波的基于状态空间控制的有源滤波器

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Abstract Shunt active power filter is a typical current tracking control system. The output LCL filter used in APF has a good damping effect to switch harmonics, but is prone to resonance. This article explores a new control method for fast tracking of compensation current and suppressing resonance. The complex form of 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 APF system are unified in the same realization. Using 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. Also incorporated into the main controller design are the stabilization of the DC-link voltage and the feed-forward compensation of grid voltages. Finally some simulation results are given to verify the effectiveness of the design.

Key words： active power filter LCL filter state feedback reduced-order observer feed-forward compensation

Received: 16 January 2018 Published: 31 August 2018

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http://dqjs.cesmedia.cn/EN/Y2018/V19/I8/16

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