Fuzzy logic feed‑forward impedance shaping of DAB converter in DC microgrid with CPL load

Ravishankar Gupta; Navdeep Singh

Fuzzy logic feed‑forward impedance shaping of DAB converter in DC microgrid with CPL load

Ravishankar Gupta

Navdeep Singh

Vol. 23, No. 10, pp. 1576-1584, Oct. 2023

10.1007/s43236-023-00641-z

Constant power load

Negative impedance

Fuzzy logic controller

Active voltage stabilizer

Abstract

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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Cite this article

[IEEE Style]

R. Gupta and N. Singh, "Fuzzy logic feed‑forward impedance shaping of DAB converter in DC microgrid with CPL load," Journal of Power Electronics, vol. 23, no. 10, pp. 1576-1584, 2023. DOI: 10.1007/s43236-023-00641-z.

[ACM Style]

Ravishankar Gupta and Navdeep Singh. 2023. Fuzzy logic feed‑forward impedance shaping of DAB converter in DC microgrid with CPL load. Journal of Power Electronics, 23, 10, (2023), 1576-1584. DOI: 10.1007/s43236-023-00641-z.