Research And Realization Of Virtual Experimental Platform Of Power Electronics Technology

With the rapid development of computer, information technology and the expansion of the scale of higher education,the establishment of virtual laboratory has become a hot trend. In this paper, it conducted a preliminary study and exploration to build a virtual laboratory for power electronics technology.To construct the virtual experimental platform of power electronics technology should be based on the computer simulation method of electronic circuits. Since the primary purpose to construct such a platform is to train students'practical skills and intuitional comprehension of power electronics technology, switch components in the circuit can be considered as ideal switches and be included in the circuit as a circuit component in some experiments not relating to device's characteristics. Such electronic equations can be made by the general theory of circuit analysis. The relationship of topology structure and equations can be established through topology and improving node methods, that is to realize the conversion of circuit diagram and equation through table matrix equation in the theory of circuit network, and making equations automatically from circuits'diagrams through software programming. These table matrix equations can be solved by Euler's or Runge-Kutta's means and the voltage and current of each branch can be gained.The virtual platform in this paper is designed according to the prototype based on the existing experimental platform (SBL-6) of power electronics technology in our laboratory. The principles and means of constructing a virtual experimental platform of power electronics technology are put forward through refining and abstracting to the prototype.The virtual experiment of "experiment of Buck Circuit using MOSFET" can be easily completed through the mixed programming of VB and MATLAB based on the advantages of VB in graphical interfaces and MATLAB in matrix processing and numerical calculation. Compared with the simulation using Psim—an emulator of power electronics, the results are correct and reliable. So this method is proved to be effective and easily carried out for those power electronic circuits containing only non-linear switching devices which can be considered as ideal switching devices. The simulation program designed by this paper can be simulated the macro-response process of power electronic devices in normal operating mode, and the process of fault operation as well.