Saturable voltage-behind-reactance model of six-phase synchronous machine in hybrid AC and DC generation system

Six-phase synchronous machines are utilized in special applications, such as naval and aircraft power systems, due to lower power per-phase, less mechanical stress, and higher reliability compared to three-phase machines. The voltage-behind-reactance (VBR) machine models offer advantages in transient simulation programs such as capability of interfacing with arbitrary networks without snubber circuits and reduced system matrix size, compared to conventional qd0 model and coupled circuit phase-domain model (CCPD). This paper presents a VBR model of a six-phase synchronous machine that considers stator mutual inductances and main flux saturation. Performance of the proposed saturable VBR model is investigated in a hybrid ac-dc generation system. Simulation results verify numerical advantages of the proposed model in terms of accuracy and simulation speed over the conventional CCPD and qd0 models.