期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 37, 期 9, 页码 10065-10069出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3159229
关键词
Damping; Pulse width modulation; Inverters; Inductors; Capacitors; Sensors; Resistors; Damping factor; LCL resonance; stability
资金
- National Key Research and Development Program of China [2021YFB2601500, 52177193]
- State Key Laboratory of Electrical Insulation and Power Equipment
In this letter, an innovative control strategy is proposed, which can achieve overcurrent protection, injected power control, and active damping using inverter-side current feedback only. A damping-factor-based design method is also proposed to avoid mathematical limitations and achieve superior resonance suppression effect. Experimental results verify the robustness of the proposed control and design method in both stiff and ultraweak grid conditions.
In the past decade, extensive active damping solutions based on state variable feedback have been proposed to damp LCL resonance. In this letter, an innovative control strategy, which can achieve overcurrent protection, injected power control, and active damping at the same time, is proposed with the inverter-side current feedback only. Moreover, to avoid the mathematical limitations when solving characteristic roots of a third-order system, the damping-factor-based design method is proposed for the first time, by analyzing its equivalent circuit. The optimal damping factor, which is recommended to be positive and as large as possible, is searched to achieve superior resonance suppression effect. Finally, the proposed control and design method is verified by experimental results and shows good robustness both in stiff and ultraweak grid conditions.
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