Smart Fault-Tolerant Control and Locating Faults in a Three-Level T-Type Inverter

• Main Authors: XU,FU-QIANG, 許富強
• Other Authors: CHAO,KUEI-HSIANG
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/8bzf4e

碩士 === 國立勤益科技大學 === 電機工程系 === 107 === This thesis proposes a smart fault-tolerant control system based on chaos theory and extension theory for locating faults and executing tolerant control in a three-level T-type inverter. First, the system constantly monitors the fault states of the 12 power transistor switches of the three-level T-type inverter; if a power transistor fails, the corresponding output phase voltage waveform is converted by a Lorenz chaotic synchronization system. Chaos eye coordinates are then extracted from a scatter diagram of chaotic dynamic states and considered as fault characteristics. The system then executes fault diagnosis based on extension theory. The fault characteristic value is used as the input signal for correlation analysis; thus, the faulty power transistor can be located and fault diagnosis can be achieved for the inverter. The faulttolerant control system can maintain the three-phase balanced output of the three-level T-type inverter, thereby improving the reliability of the motor drive system. The feasibility of the proposed smart fault-tolerant control system was assessed by conducting simulations and experiments in this thesis, and the results verified its feasibility.