High Overload Power Supply System and Its Energy Synchronization Control Method for Short-Term High-Energy Pulse Load

In order to meet the power supply requirement of short-term high-energy pulse load, a high overload power supply system and its energy synchronization control method are proposed, which can provide three times the rated capacity under short-term overload conditions. In terms of power supply structure, the diesel generator and the internal uninterruptible power supply (UPS) are cleverly utilized to form three energy supply channels for meeting multiple overload requirements, without increasing the rated capacity of the diesel generator. Meanwhile, it is found that the low-frequency power oscillation will occur once the high-energy pulse loads are put in. That is because the angular accelerations of the diesel generator and the internal converters turn to be inconsistent during the dynamic process. Therefore, an enhanced virtual synchronous generator (VSG) control with self-adaptive dynamic synchronous torque is proposed to suppress the low-frequency power oscillation by narrowing the acceleration gap between the diesel generator and the internal converters during the dynamic adjustment period. Then, the synchronous power supply for the three power supply channels is realized under high-energy pulse load conditions. Finally, the experimental results verify the effectiveness of the proposed overload power supply system and its energy synchronization control method.