A grid-connected converter active damping control method
By using a first-order unstable digital filter for phase compensation in the grid-connected converter, the resonance problem of the LCL filter is solved, the system stability and current quality are improved, and it is adapted to wide frequency variation and weak grid conditions.
CN119109040BActive Publication Date: 2026-06-05HOHAI UNIV +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HOHAI UNIV
- Filing Date
- 2024-09-10
- Publication Date
- 2026-06-05
Smart Images
Figure CN119109040B_ABST
Abstract
The application discloses a grid-connected converter active damping control method and belongs to the field of converter control. The control method is characterized in that a first-order unstable digital filter is connected in series on a positive and negative feedback path of a capacitor voltage, a reasonable parameter is used for design, and a phase compensation characteristic of the filter is fully utilized to compensate for a phase lag introduced by digital control. The filter can guarantee the stability of the system and improve the robustness of the system in the case of nonlinear change of grid impedance inductance and weak grid, and the filter has few design parameters and a simple design process. The converter loop structure adopting the control method is simple, convenient to design, large in system stability margin, and suitable for three-phase LCL filter grid-connected / following grid type converter occasions.
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