Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (2): 71-80.doi: 10.16088/j.issn.1001-6600.2020050301

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Control Strategy of Microgrid Super Capacitor Hybrid Energy Storage System

YANG Yueqiang, ZHU Longji*   

  1. School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan Anhui 232001, China
  • Received:2020-05-03 Revised:2020-06-21 Online:2021-03-25 Published:2021-04-15

Abstract: Photovoltaic microgrid has two working modes: off-grid modes and grid-connected modes. In off-grid mode, the DC bus voltage fluctuates due to the power changes of load and renewable energy. In grid-connected mode, the grid-connected current fluctuates greatly due to the changes of input power and the low harmonics generated by the nonlinear load, thus affecting the power quality. This paper uses two kinds of energy storage elements of super capacitors and battery packs to form a microgrid hybrid energy storage scheme. When the microgrid runs off-grid, it can make use of the quick response of super capacitor to compensate the transient power, so as to stabilize the DC bus voltage faster. During grid-connected operation, in the traditional grid-connected voltage and current double closed-loop control strategy, the super capacitor current control loop is added to reduce the current ripple during grid-connected operation. The proposed hybrid energy storage control scheme is simulated and verified. The results show that the proposed hybrid energy storage control strategy can control the fluctuation of DC microgrid bus voltage within 5%, and maintain the total harmonic distortion of grid-connected current at 7%, so as to achieve the purpose of control.

Key words: microgrid, super capacitor, bidirectional DC/DC, hybrid energy storage, control strategy

CLC Number: 

  • TM712
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