A New Feedback Method for PR Current Control of LCL-Filter-Based Grid-Connected Inverter
作者： Guoqiao Shen , Xuancai Zhu , Jun Zhang , Dehong Xu
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摘要: For a grid-connected converter with an LCL filter, the harmonic compensators of proportional-resonant (PR) controller are usually limited to several low-order current harmonics due system instability when compensated frequency is out bandwidth control loop. In this paper, new feedback method for PR proposed. The weighted average value currents flowing through two inductors filter used as regulator. Consequently, degraded from third-order function first-order one. A large proportional control-loop gain can be chosen obtain wide bandwidth, and optimized easily minimum distortions, well stability. inverter proposed investigated compared those using traditional methods. Experimental results on 5-kW fuel-cell provided, strategy has been verified.
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