ENERGY STORAGE SYSTEM WITH RANGE EXTENDER AND ENERGY MANAGEMENT AND CONTROL METHOD

A system comprises a first energy system 100, a range extender 120, and a controller. The range extender 120 has a second energy system, first and second converters, and a by-pass. The first converter 212 is selectably coupled between the first energy system and an electric load 160, the second converter is selectably coupled between the second energy system and at least one of an output side of the first converter and an input side of the electric load, and the by-pass is selectably coupled between the first energy system and at least one of the output side of the first converter, an output side of the second converter and the input side of the electric load. The controller may control the first energy system and the range extender to work in a normal operation mode and a fault protection mode, in the normal operation mode, the first and second energy systems are parallel coupled to the electric load through the first and second converters, respectively, and in the fault protection mode, the first energy system is coupled to the electric load through the by-pass, and the second energy system is decoupled from the electric load. The present invention further relates to a method for supplying power to the electric load using said system.