Abstract
The electrical excitation flux-switching (EEFS) machine, which exhibits advantages including high reliability, good flux regulation capability, bipolar flux linkage and sinusoidal back-EMF, is suitable for use as a generator in DC power systems. In this paper, a direct power control (DPC) scheme is investigated for voltage regulation of the EEFS generator in order to improve the dynamic performance. However, the stator flux estimation accuracy will affect torque control quality. Hence, a simple and practical stator flux estimation method, which only contains a second-order low pass (LP) filter, a high pass (HP) filter and a simple coordinate transformation module, is proposed for the DPC scheme of the EEFS generator. In this estimation method, the HP filter can completely filter out the DC drift in the back-EMF, and the leading phase produced by the second-order LP filter and HP filter can be compensated by the coordinate transformation module. Hence, at any synchronous angular frequency, the amplitude-frequency and phase frequency characteristics of the new estimation method are same as those of the pure integrator, while DC gain of this method is zero. The DPC scheme of the EEFS generator using this estimation method exhibits good dynamic performance, which is verified by experimental results.
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