Abstract
To solve the problem of small capacity and low voltage level of the traditional battery energy storage system (BESS), a single-stage cascaded H-bridge with energy spring (ES) which can eliminate the secondary pulsating current injecting into the battery is proposed in this paper. In addition, the virtual synchronous generator (VSG) control strategy is adopted for the grid-friendly integration of the BESS. The VSG control strategy is analyzed and optimized to achieve seamless grid connection and improve the dynamic performance of reactive power. The experimental results demonstrate the correctness and effectiveness of the proposed topology and control strategy.
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