A Dynamic Consensus Algorithm-based Adaptive Virtual Resistance Control Strategy for Modular On-line Uninterruptible Power Supply System

In the modular on-line Uninterruptible Power Supply (UPS) system, The unequal power sharing may exist in the system due to the mismatched line resistance, leading to the circulating current, overloading and even tripping the system. In order to overcome this issue, this paper proposes a dynamic consensus algorithm (DCA)-based virtual resistance control strategy to share the active power and harmonic power. In contrast with the previously proposed method, this approach does not require a central controller, and the communication links are only required between the neighboring UPS modules, which enhances system's reliability and flexibility. Simulation results are provided to verify the effectiveness of the proposed control strategy.