Multi-channel three-port DC/DC converters as maximum power tracker, battery charger and bus regulator

This paper presents the design and analysis of a satellite platform power system, which utilizes several three-port converters to interface various independent solar panels, one battery to a regulated bus. The three-port converter features low component count and compact structure. The paralleled three-port converters can not only boost the power level, but also provide redundancy, which is important to such critical applications. The proposed output port ¿hybrid¿ current sharing (CS) method shows good transients while requiring no interchannel level CS bus, meanwhile, the proposed passive CS method is well suited to both the MPPT algorithm for the input port and the battery charge control for the battery port. The analysis and design of the system level control strategy, the CS methods for three different ports, the MPPT and battery charging algorithms are verified by simulation and experiments.