Abstract
This study proposes a smart fault-tolerant control system based on the theory of Lorenz chaotic system 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 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 the fault diagnosis can be achieved for the inverter. The fault-tolerant 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 in this study, and the results verified its feasibility. Accordingly, after the occurrence of the fault in power switches, the balanced three-phase output line voltage remained unchanged, and the quality of the output voltage was not reduced by using the integration of the proposed fault diagnosis system and fault-tolerant control system for a three-level T-type Inverter.
Highlights
Recent advances in renewable energy and electric vehicle technology have prompted the development of multilevel inverters [1,2,3,4,5]
This study proposes a smart fault-tolerant control system for locating faults in a three-level T-type inverter; the system is based on an artificial intelligence algorithm incorporated with chaos theory [25]
The spare leg comprises gate bipolar transistors (IGBT) Sx + and Sx −, which can be used to replace those in the faulty phase to the insulated gate bipolar transistors (IGBT) Sx+ and Sx, which can be used to replace those in the maintain circuit operation
Summary
Recent advances in renewable energy and electric vehicle technology have prompted the development of multilevel inverters [1,2,3,4,5]. Multilevel inverter systems must be equipped with fault detection mechanisms and fault-tolerant control capabilities to ensure continued operation in failure events [8,20,21]. To maintain the three-phase balance of the output voltage of the inverter, the power transistor switching state and the phase angle of the reference voltage in the pulse width modulation (PWM) control mechanism must be modified simultaneously This process would increase the difficulty of designing and controlling the fault tolerance of a multilevel inverter in a failure event. T-type shown control in the event of any power switchthis failure in the three-level The faults of such an inverter can be divided into three types: Short-circuit fault, openthe simulation is used to prove its feasibility.
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