Browse Publications Technical Papers 2018-01-1927

Transient Stability Analysis of DC Solid State Power Controller (SSPC) for More Electric Aircraft 2018-01-1927

The solid state power controller (SSPC) is one of the most important power electronic component of the aircraft’s electrical power distribution (EPS) system. This paper presents the architecture of the DC SSPC and provides the mitigation techniques for transient voltage overshoot during turn-off. The high source side inductance carries breaking current (9xnominal current) just before turn-off and induces large voltage transient across the semiconductor devices. Therefore, the stored inductive energy needs to be dissipated in order to prevent semiconductor switches from over-voltage/thermal breakdown. Three different transient voltage suppression (TVS) devices to reduce voltage stress across switches are included in the paper for detail study. The comprehensive comparison of the TVS devices is presented. In addition, the thermal impact of the TVS devices on the semiconductor switches is also analyzed. Later, the transient simulation model of the SSPC is built in LT-Spice and the effectiveness of the proposed protection mechanisms is verified.


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