An open circuit fault-tolerant control strategy for matrix convertor based on mathematical construction modulation

Matrix convertor is a direct AC/AC converter with many advantages. However, it could heavily impact the operation performance and the use of life when having open circuit fault. Hence, proposing an open circuit fault tolerant control strategy for matrix convertor based on mathematical construction modulation. First, using output observer detects and diagnoses the open circuit faults; then, taking the hardware method of adding a redundant phase bridge to replace the fault phase when open circuit fault occurs, at the same time, modifying the modulation strategy for the continuous operation and good dynamic and steady performance even under fault condition. The simulation results verify the feasibility and availability of the method proposed.