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- 저자 : Ravishankar Gupta (검색결과 1 건)
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Fuzzy logic feed‑forward impedance shaping of DAB converter in DC microgrid with CPL load
Ravishankar Gupta,Navdeep Singh 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.10
In a DC microgrid, the dual active bridge (DAB) converter is employed for voltage conversion and power transfer. DABbased energy storage systems (ESSs) are known as constant power loads (CPLs). To improve the input current quality of DAB converter, an LC filter is cascaded to a DAB converter. Impedance interaction takes place between the impedance of the LC filter (Zout) and the impedance of the DAB converter (Zin). ESSs are affected by the impedance interactions of cascaded systems. This interaction leads to significant oscillation and instability, which in turn causes voltage fluctuation and power loss. To overcome instability, this paper proposes a modified fuzzy logic controller (FLC), an active voltage stabilizer (AVS), and feed-forward (FF) controller to reshape the impedance of the DAB converter. In the modified controller, the FLC handles precise voltage monitoring, the AVS handles the transient stability limit, and the FF controller removes the impedance interaction between Zin and Zout. The feed-forward coefficient is calculated through the Routh–Hurwitz criterion. The suggested controller assures system stability during load variation, a quick dynamic response, and precise voltage monitoring. In addition, it achieves reductions in the settling time, rise time, and overshoot. This leads to reliable microgrid operation when compared to the traditional PI (PI + AVS), and (PI + AVS + FF) controllers. The modified controller is verified by results obtained with an OPL-RT-based hardware-in-the-loop (HIL).
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