Electromagnetic parameter analysis and influence mechanism of q‑axis excitation winding structures on doubly excited synchronous machine ventilation and cooling

Yuhao Cao; Dan Li; Wenmao Liu; Weili Li; Mingfei Ban

Electromagnetic parameter analysis and influence mechanism of q‑axis excitation winding structures on doubly excited synchronous machine ventilation and cooling

Vol. 25, No. 10, pp. 1918-1929, Oct. 2025

10.1007/s43236-025-01027-z

Doubly excited synchronous machine

Rotor topology

Inductance coefficient

Multi-physics

Abstract

With the integration of large-scale new energy sources and power electronics, the demands for dynamic voltage support and reactive power compensation in power systems have grown. However, traditional synchronous condensers face limitations in terms of capacity, maintenance costs, and economic efficiency, making them insufficient to meet the demands of modern large-scale power systems. To tackle this issue, this study introduces a novel dual-axis excited machine designed to enhance power system stability and improve reactive power compensation through high stability, substantial inertia, and robust bidirectional voltage support. By overcoming minimum excitation current limitations, this machine significantly improves the over-voltage suppression per unit installation, yielding better investment returns. The multi-circuit mathematical models of the stator and rotor are derived using coordinate transformations and rotor slot pitch parameter differences, with each coil treated as a theoretical unit. Based on this, the theoretical derivation of the inductance coefficient expression was conducted. Furthermore, through coupled magnetism, heat, and flow multiphysics field simulation, it investigates the cooling performance of the optimal rotor topology, revealing the interplay of air flow rates between the d-axis and the q-axis. This study also validates the simulation accuracy by comparing simulation results with measured temperature data from a conventional single-axis synchronous machine.

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Cite this article

[IEEE Style]

Y. Cao, D. Li, W. Liu, W. Li, M. Ban, "Electromagnetic parameter analysis and influence mechanism of q‑axis excitation winding structures on doubly excited synchronous machine ventilation and cooling," Journal of Power Electronics, vol. 25, no. 10, pp. 1918-1929, 2025. DOI: 10.1007/s43236-025-01027-z.

[ACM Style]

Yuhao Cao, Dan Li, Wenmao Liu, Weili Li, and Mingfei Ban. 2025. Electromagnetic parameter analysis and influence mechanism of q‑axis excitation winding structures on doubly excited synchronous machine ventilation and cooling. Journal of Power Electronics, 25, 10, (2025), 1918-1929. DOI: 10.1007/s43236-025-01027-z.