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LLCL-filter is an emerging fourth-order filter proposed after the third-order LCL -filter. It uses smaller passive components than the LCL-filter, but is still burdened by resonance complications when used with a grid converter. An LLCL-filtered converter must, hence, be passively or actively damped. Active damping is presently more efficient, and can easily be realized by feeding back a state variable...
The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current...
The capacitor voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the capacitor voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the capacitor voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from...
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