The Control Strategy Research of Hybrid EMU Energy Storage System
Because of its environmentally friendly, highly efficient, and multifunctional, the new hybrid EMU will have a broad space for development. Hybrid EMU ESS links lithium battery and intermediate DC bus together, bidirectional energy flow, its load is nonlinear, time-varying, and other characteristics. This work establishes the equivalent small-signal model of ESS based on the Thevenin equivalent circuit model of the power lithium battery. On this basis, choose a right charge and discharge control strategy according to the complicated working condition of the hybrid EMU ESS, and the voltage and current double-closed-loop controller is designed. The simulation shows that the system controller is robust and suitable for the complex working condition application of the ESS.
KeywordsHybrid EMU Energy storage system (ESS) Lithium battery Small-signal model Double-loop control
This work was supported in part by the China National Science and Technology Support Program under Grant (2013BAG21QB00) and the National Natural Science Foundation of China under Grant (U1134204).
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