The Bidirectional AC/DC Power Converter with Capability of Suppressing the Harmonic Current in Hybrid Micro Grid

In hybrid micro grid, the bidirectional AC/DC power converter (BIC) is required to guarantee voltage stability and power balance of AC and DC sub-grid. Based on analyzing the main circuit of BIC, this paper proposes a control strategy that not only realizes the function of bidirectional power conversion but also suppresses harmonic current. This control strategy combines the harmonic current detection algorithm based on Fryze-Buchholz-Depenbrock power theory and bidirectional power converting method. The control command for controlling the BIC to suppress the harmonic current is obtained by the proposed control strategy. Finally, the validity and practicability of the control strategy are verified by simulations.