Abstract
Paralleled DC-DC converters system normally is operated with current-sharing control to achieve equal current distribution among the converters connected in parallel. However, the added current-sharing control might make the paralleled DC-DC converters system suffer from potential degradation of stability and dynamic performances. Hence, the stability analysis of paralleled DC-DC converters system is a hot issue. In order to analyze the stability of paralleled DC-DC converters system accurately and effectively, an extended stability analysis method based on Floquet theory is proposed for paralleled DC-DC converters system in this paper with considering the periodic disturbance. And, a paralleled buck converters system with average current-mode control is taken as an analysis object. The extended stability criterion of paralleled buck converters system based on Floquet theory is derived. Finally, the simulation and experimental results verify the correctness and effectiveness of the proposed stability criterion with considering the periodic disturbance. This paper provides a new choice for the stability analysis of paralleled DC-DC converters system.
Highlights
Paralleled DC-DC converters system has been widely used in DC distributed power systems due to its redundancy, high reliability, and expandability of output capability [1]–[4]
In this paper, an extented stability analysis method for paralleled DC-DC converters system with considering the periodic disturbance based on Floquet theory is proposed
According to the simulation and experimental results, the proposed stability analysis method based on Floquet theory is practical and accurate
Summary
Paralleled DC-DC converters system has been widely used in DC distributed power systems due to its redundancy, high reliability, and expandability of output capability [1]–[4]. The calculation of the state transition matrix over the complete switching period is simplified by averaging the state variables during one switching period, which makes Floquet theory easy to be applied into the stability analysis of multi-module paralleled DC-DC converters system. The N -module paralleled buck converters system with average current-mode control is taken as an analysis object. STABILITY ANALYSIS OF PARALLELED SYSTEM Firstly, the stability of N-module paralleled buck converters system with average current-mode control is analyzed based on Floquet theory . The state equations of N -module paralleled buck converters system with average current-mode control can be obtained by summarizing (3) to (6). According to the stability criterion based on Floquet theory, if Zmax < 1, the paralleled system will be stable, otherwise, the paralleled system is unstable [24]
Sign-in/Register to view highlights & summary 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.
