Abstract
In order to eliminate the inherent second harmonic current (SHC) in single-phase power-factor-correction converters, a second harmonic current compensator (SHCC) terminated with a small storage capacitor is connected in parallel with the output of the PFC converter to absorb the SHC. However, with the decreasing of the dc-link capacitor, the system may become unstable due to the impedance interaction between the PFC converter and the downstream dc-dc converter. This paper firstly analyzes the characteristic of the port-impedance of the SHCC, indicating that the SHCC with conventional dual loop is of no ability to solve the instability problem. Then, in order to solve instability problem, a virtual-impedance which connects in parallel with the input of the SHCC is adapted. The realization and design of the virtual impedance are also included in this paper. Finally, the simulation results are presented to verify the validity of the proposed control scheme.
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.
