Fully Digital Simulation System of Three-level PWM Converter Based on MATLAB

As DSP is more and more widely used in the field of power electronics conversion, in order to enhance the comparability between the result of simulation and the experimental result of DSP control system, and increase the portability of the simulation program, it is very necessary to set up a fully digital power electronic simulation system based on imitating the working mechanism of DSP. This paper proposes a kind of the S-Function written all digital simulation method under MATLAB environment based on clock drive and interruption mechanism. This method uses the sampling time of S-Function module as clock cycle to achieve the simulation clock driving mechanism, and then establishes carrier and imitate EPWM interrupt mechanism of DSP to generate interrupt signal based on the clock drive, the program of the module works once when it gets the interrupt signal, at last imitates the working way of DSP regular sampling method and realizes the discrete event simulation. At the same time, some modules are common used, it can be used repeatedly and improve efficiency of simulation. Finally, it takes three-level converter modular all digital simulation as an example, and verifies the validity of the simulation method.