期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 2, 页码 2373-2383出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3008160
关键词
Damping; Resonant frequency; Impedance; Power harmonic filters; Feedforward systems; Integrated circuits; Inverters; Capacitor-current-feedback (CCF) active damping; grid impedance; positive damping; robustness; unit point of common coupling (PCC) voltage feedforward
资金
- National Key Research and Development Program of China [2016YFB0900100]
- National Natural Science Foundation of China [51477062]
The article studies a hybrid active damping method that combines capacitor-current-feedback (CCF) and unit point of common coupling (PCC) voltage feedforward. By properly designing the CCF gain, a wide range of positive damping can be achieved, ensuring high robustness.
Both the capacitor-current-feedback (CCF) active damping and the point of common coupling (PCC) voltage feedforward can provide damping for the LCL-type grid-connected inverter. They are usually individually adopted, and negative damping will occur in a certain frequency range due to the digital control delay, leading to a nonminimum phase behavior. In this article, a hybrid active damping that combines the CCF and unit PCC voltage feedforward is studied. With properly designing the CCF gain, the positive damping range could sweep the entire frequency range with the variation of grid impedance. As a reward, the maximum profit of damping cooperation can be harvested, ensuring high robustness against both grid impedance variation and filter parameter fluctuation. The simulation and experimental results are provided to verify the effectiveness of the hybrid active damping.
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