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.
University of Nottingham
Aerospace Systems and Technology Conference