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摘要
Active damping methods based on grid-connected current feedback are commonly used to suppress resonant spikes in LCL-type grid-connected inverters. Existing active damping methods for grid-connected current feedback amplify high-frequency noise and degrade the quality of grid-connected current. Therefore, an active damping method for grid-connected current feedback based on negative low-high-pass filter is proposed to further improve the quality of grid-connected current by reducing the gain to high-frequency signals while suppressing resonant spikes. The pole configuration method was applied to design the parameters of this active damping around the stability margin of the system and the active damping effect. Then the robustness of the active damping control system was discussed when the LCL parameters and grid impedance were varied. The simulation and experimental results show that with this method, the control system has better suppression effect on high-frequency noise, and good stability margion under different working conditions, and can effectively suppress harmonic current when the grid impedance changes. ? 2023 Editorial Department of Electric Machines and Control.
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