Hybrid passivity‑based control for stability and robustness enhancement in DC microgrids with constant power loads

Qihong Xian; Yubin Wang; Fan Wang; Ruixin Li; Song Wang

Hybrid passivity‑based control for stability and robustness enhancement in DC microgrids with constant power loads

Vol. 23, No. 2, pp. 296-305, Feb. 2023

10.1007/s43236-022-00529-4

DC microgrid

Constant power load

System stability

Passivity-based control

Abstract

In a DC microgrid, the negative damping characteristics of a constant power load can deteriorate the stability of the whole system. To improve the robustness and stability of the DC microgrid, a hybrid passivity-based control of damping injection is presented in this paper. The stability of the closed-loop system is ensured by the energy dissipation property of the passivity-based control. A proportional-integral controller is integrated with the passivity-based controller to form a hybrid passivity-based control to improve control robustness. A small-signal model of a DC power system with constant power load is derived in detail, and the stability of the system is analyzed with the Lyapunov eigenvalue method. The proposed hybrid passivity-based control provides the system with a faster recovery and a larger power boundary when compared with the typical voltage-current dual-loop control. First, the proposed control is verified by simulation of the DC power system based on MATLAB/Simulink, and the feasibility and superiority of the proposed control are further verified by hardware-in-loop (HIL) experiments based on real-time laboratory (RT-Lab) and a TI DSP TMS320 F28335.

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Cite this article

[IEEE Style]

Q. Xian, Y. Wang, F. Wang, R. Li, S. Wang, "Hybrid passivity‑based control for stability and robustness enhancement in DC microgrids with constant power loads," Journal of Power Electronics, vol. 23, no. 2, pp. 296-305, 2023. DOI: 10.1007/s43236-022-00529-4.

[ACM Style]

Qihong Xian, Yubin Wang, Fan Wang, Ruixin Li, and Song Wang. 2023. Hybrid passivity‑based control for stability and robustness enhancement in DC microgrids with constant power loads. Journal of Power Electronics, 23, 2, (2023), 296-305. DOI: 10.1007/s43236-022-00529-4.