Research On Auxiliary Power Storage System Characteristics In Compressed Air Super Capacitor Hybrid Energy Storage System

ABSTRACT:Wind, solar and other renewable energy sources have dispersed, not fixed, instability and other problems, by hybrid energy storage system, energy can be converted to store in different characteristics. It not only can improve the power utilization can also be combined with the power grid system to improve power quality. The researchers combine compress air and super capacitor energy storage, make full use of the advantages of them, to achieve efficient use of renewable energy.This paper researchs compressed air ultracapacitor hybrid energy storage system, and focus on the auxiliary electricity storage systems. This paper studies the basic characteristics of super capacitor, and its charge-discharge efficiency, proposes considering redundancy asymmetric topology design method and considering the depth of ultracapacitor charge and discharge symmetrical topology design method. Studied the hybrid energy storage system auxiliary electricity storage system structure and working principle, through the analysis of compressed air energy storage and super capacitor energy storage characteristics, matched its characteristics. Studies another important part of the the auxiliary electricity storage systems, three-level bi-directional DC/DC converter, analyzes the operating characteristics and control strategies, and experimental research.In the hybrid energy storage system, the control system of the auxiliary electricity storage is the key. This paper proposes a method of automatic frequency power regulation control to achieve the super capacitor charge and discharge control and energy flow control of hybrid energy storage system.Hybrid energy storage system involves electromechanical conversion,this paper introduces Energetic Macroscopic Representation, introduces the basic ideas and rules of graphical modeling approach to design hybrid energy storage system EMR model, by inversion control method designes hybrid energy storage system control section. Though Matlab-Simulink platform, this paper simulates the storage conditions, energy release conditions, including photovoltaic electrical conditions, load disturbance conditions simulated to verify the above theory.Finally, based on the simulation result, designed15kW experiment platform, to verify the correctness of the control strategy and hybrid energy storage system design parameters is correct.