A FAULT REDUNDANCY STRATEGY BETWEEN BRIDGE ARMS OF THE MODULARIZED APF

As one of the main effective equipment to deal with the grid harmonic problem, Active Power Filter (APF) becomes large-scale industrial application gradually. With the increasing requirements of high-capacity APFs in industries, multi-module parallel connected APF becomes an important developmental direction and research hotspot for its flexible capacity and high reliability. A redundant strategy which can make use of the undamaged bridge arm of the damaged modules is given in this paper, as shown in Fig.1. Compare with the method that removes the whole module when it is damaged, the flexibility of system can be improved by this redundant strategy. The feasibility and practicality of the proposed strategies are verified by prototype experiments.