Study on Calculation Method of D-Axis Super-Transient Reactance of Damped Winding Permanent Magnet Electrical Machine

Dynamic parameters directly reflect the dynamic performance of electrical machines. In this paper, two methods for calculating the d-axis super-transient reactance of a damped winding permanent magnet electrical machine (DWPMEM) are proposed. One is the analytical method: the analytical model of d-axis super-transient reactance is developed, and the d-axis super-transient reactance is calculated by taking the coupling of permanent magnet (PM) and winding current magnetic field into account. The other is the parameter identification method: the parameter identification model of DWPMEM is established, and the reactance is identified based on the DC step voltage method. The calculation accuracy of the two methods is verified by the measured data, and the variation rules of the d-axis super-transient reactance with damping winding structures are analyzed. The work of this paper has a certain reference value for the design and dynamic operation evaluation of DWPMEM.