三相正弦波逆变器容错控制

针对变频器逆变模块故障率高的问题,建立三相正弦波脉宽调制(SPWM)逆变模块中的绝缘栅双极型晶体管(IGBT)发生短路故障后逆变模块的数学模型.根据这个故障模型,实现对系统故障的有效诊断,同时结合硬件冗余的容错控制策略对电路拓扑进行重构,使得三相逆变器在短路故障情况下仍能正常工作,从而提高系统硬件层的容错能力和可靠性.在MATLAB/Simulink环境下实施系统仿真,验证了三相正弦波逆变器容错控制的有效性和可行性.

Fault Tolerant Control of Three-Phase Sine Wave Inverter

Regard to the high failure rate of inverter module for the inverter, the mathematical model of the inverter module has been established after the short-circuit fault of the IGBT was occurred in the three-phase SPWM inverter module. Based on the fault model, the effective diagnosis of system failure was achieved, simultaneously the circuit topology was restructured by hardware redundancy in the proposed fault-tolerant control strategy, so that the three-phase inverter still worked well when short-circuit was occurred and the fault tolerance and reliability of the system hardware layer was improved. Based on the MATLAB/Simulink circumstance, the result of system simulation demonstrated the effectiveness and feasibility of fault-tolerant control for the three-phase sine-wave inverter.