Abstract
LCL filter is commonly adopted in grid-tied inverters to eliminate harmonics produced by the pulse width modulation (PWM), because of its superior attenuation ability. However, it introduces potential resonance that is especially critical when connected to a weak grid with grid impedance varying. Practically, the active damping methods are popular in stabilizing the inverter system due to their flexibility and power loss-less, compared to passive ones. Active methods are mostly implemented with additional digital filters, power converters, control loops or/and sensors, complicating inverter and increasing the costs. This paper provides an active damping method based on digital control delay (DCD) to ensure the stability of LCL-filtered inverters under the stiff or weak grid conditions. It is implemented with tuning the DCD to a proper region, which can be easily determined by method proposed in this paper. Finally, damping method is verified by simulation results in MATLAB/Simulink.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
