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1. PV ISOLATED THREE-PORT CONVERTER AND ENERGY-BALANCING CONTROL
METHOD FOR PV-BATTERY POWER SUPPLY APPLICATIONS
ABSTRACT
A photovoltaic (PV)-based stand-alone power system is usually used to manage the
energy supplied from several power sources such as PV solar arrays and battery and deliver a
continuous power to the users in an appropriate form. Traditionally, three different dc/dc
converters would have been used. To reduce the cost and improve the power density of the
power system, an integrated solution of PV isolated dc/dc three-port converter (TPC) is proposed
in this paper. Zero current switching can be achieved for all main diodes and MOSFETs to
improve the efficiency, and a continuous input current of solar array is maintained by adding a
magnetic switch derived from a fourth winding of the half-bridge transformer. Based on the
energy-balancing part formed by boost, the control methods for the single module to realize
maximum power point tracking (MPPT), battery charge control, and main bus regulation are
proposed. The power system control method for multi modules in parallel is also derived, and the
operation of the TPC power system can be transited between conductance mode and MPPT
mode automatically. Finally, the experimental results verify that the proposed TPC, together with
the proposed control method, meets the requirements of a high-power-density stand-alone PV-
battery power system.