The three-level PWM rectifier with high reliability based on the three microcontrollers control

Three-level PWM rectifier high pressure, high capacity, and the less power harmonic pollution can achieve unity power factor operation and the prospects are broad. But the reliability is a bottleneck restricting its application. In this paper a high reliability control project based on three microcontrollers (DSP, SCM and CPLD) was presented, including the subdivision of the functions in hardware, the redundancy design of safety testing aspects, as well as mixed-language programming using C and assembly language in software and the design strategy of .