Architecture and Design of Parallel Power Supply for Vehicle Generators

With the increasing electrification and intelligence of commercial vehicles, the on-board power demand has risen significantly, rendering conventional independent power supply architecture inadequate. This study proposes a parallel power supply architecture utilizing two identical 28 V/120 A generators, where simplified droop control inherent in standard alternator regulation achieves automatic load sharing without complex active controllers, offering a more cost-effective and redundant alternative to conventional independent power supply systems. To validate the feasibility and stability of this parallel system, a simulation model was established, focusing on load sharing and current stability under dynamic conditions. Furthermore, empirical tests were conducted on a 10-m commercial bus under extreme conditions. The results demonstrate that the parallel architecture maintains a lower air conditioner current, thereby improving system efficiency and operational reliability compared to conventional independent power supply architecture.