Auxiliary Power Unit Control Algorithm for Input Voltage Disturbance Suppression

Abstract

-The railway vehicle has an auxiliary power unit for supplying power to the associated electronic control devices and passenger service unit. Typically, input voltage from the catenary for rolling stock is highly fluctuating according to the substation capacity, vehicle propulsion and regeneration. Especially, the frost and freezing on contact wire in winter can cause a blackout inside vehicle, and also brings about electronic components damaging and the system down. To prevent this problem, a large filter and capacitor is used. But this is not a perfect solution, because it is increasing weight of the unit. In this paper, a new algorithm is proposed to suppress the disturbance without adding devices. Simulation and experimental results show that the proposed algorithm has performance to suppress the disturbance at the sudden input voltage variations.

Design of 3-level LLC converter voltage controller for wide input voltage fluctuations

“…Therefore, the APU, being closely related to passengers, requires electrical insulation. [1]- [3]. This insulation is achieved using an LLC resonant converter, which achieves high efficiency through zero-voltage switching in the entire load range using a transformer-based insulation DC-DC converter.…”