Dissipativity Robustness Enhancement for <i>LCL</i>-Filtered Grid-Connected VSCs With Multisampled Grid-Side Current Control

Capacitor current active damping is a common method to achieve dissipation for LCL -filtered grid-connected converters using grid-side control. However, the dissipative characteristic of converter output admittance near critical frequency can easily be jeopardized by filter parameter deviation. Besides, grid voltage feedforward often overlooked when designing dissipativity, which is, however, preferred improve transient performance. To tackle these challenges, multisampled control scheme proposed in this article. By combining capacitor and feedforward, not only achieved below Nyquist but also dissipativity robustness against deviation enhanced. -filter resonant designed frequency, simplifies internal stability design. Finally, effectiveness verified through experiments.