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The Aircraft Ground Power Unit(GPU) could replace the Auxiliary Power Unit (APU) in the aircraft while the aircraft is parking in the airport. Therefore, the oil-consuming and the air pollution of the APU are solved. However, the GPU is faced with the challenges of utilization, power quality, and fault-tolerance. Thus a novelty centralized aircraft GPU based on a three-level neutral point clamped cascaded converter (3LNPC-CC) is introduced to improve the utilization and power quality. Furthermore, an evaluation voltage balance strategy is proposed for the DC-port fault-tolerance of the 3LNPC-CC. Additionally, the modulation of phase shift pulse width modulation (PSPWM), and the control of double closed-loop are used in the 3LNPC-CC respectively. The simulation including the control, modulation, and fault-tolerance of the system is established to verify the feasibility and the performance itself, especially on the evaluation voltage balance strategy for the DC-port fault. Moreover, a prototype of the GPU and the relevant experiment is completed to verify the correctness and feasibility of the system and the strategy.

Voltage Balance Evaluation Strategy after DC-port Fault in Centralized Aircraft Ground Power Unit Based on Three-Level Neutral Point Clamped Cascaded Converter Xu Peng, Kaiyue Gong, Xiao Liang, Xinyu Zhu

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