Control Strategy of the Hybrid Energy Storage System for Leveling Off Fluctuating Power Output of Stand-Alone Photovoltaic System

Abstract:

Hybrid energy storage system (HESS) including battery and super-capacitor can take advantages of both high energy density and high power density. In the stand-alone PV micro-grid, in which two buck/boost bidirectional converters are connected to the DC bus directly, a novel energy management scheme is proposed. After filtering the fluctuating power of the HESS, charge and discharge currents of the battery are controlled by hysteresis control method, the super-capacitor supplies the difference of the power. To leveling off the fluctuating power output of photovoltaic system and control the voltage of the DC bus, a new control strategy applied to the bidirectional converter of the super capacitor is put forward. The feed-forward loops of input voltage, load current and output voltage are introduced to improve the response speed and stability of the system. Results of the simulation show the effectiveness of the proposed energy management and control strategy.

• Periodical: Advanced Materials Research (Volumes 860-863)
• Pages: 608-612
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.860-863.608
• Online since: December 2013
• Authors: Hai Bo Wang*, Xiu Yang, Jun Liu, Jie Chen
• Keywords: Battery, Buck/Boost Bidirectional Converter, Energy Management Scheme, Feed-Forward Control, Hybrid Energy Storage System, Photovoltaic (PV) System, Super-Capacitor (SC)

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