CPC H01G 11/08 (2013.01) [H01M 10/052 (2013.01); H02J 7/345 (2013.01)] | 20 Claims |
1. A hierarchical voltage control system of a multi-energy complementary hybrid energy storage system, comprising: a supercapacitor unit, a lithium battery unit, a power conversion system, a detection circuit, and a processor, wherein the supercapacitor unit and the lithium battery unit are both connected to a DC bus to form a parallel-structure-type hybrid energy storage system, and the supercapacitor unit and the lithium battery unit are each configured with a power device and a switch to control a connection relationship with the DC bus according to a charging or discharging state of the corresponding unit;
the detection circuit detects current and voltage values of the supercapacitor unit, the lithium battery unit, and the DC bus, detects an operating parameter of the power conversion system, and transmits the operating parameter to the processor, the power conversion system being connected in parallel to the DC bus for bidirectional power conversion of AC and DC energy sources; and
the processor determines a system operating condition according to a relationship between a voltage of the supercapacitor unit and a voltage of the lithium battery unit that are collected, and uses a hierarchical voltage control strategy to control charging and discharging states of the supercapacitor unit and the lithium battery unit.
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