Numerical simulation in power electronics using the MATLAB-SIMULINK program

In this article we present a new method of numerical simulation of systems composed of static converters. This method is based on a new approach to modelling of a power interrupter. The resolution of the equations is based on a constant matrix despite the changes of state of the interrupter. The article presents the method of modelling the power interrupters in the MATLAB-SIMULINK environment. The placing of equations is wholly automatic supported by nodal analysis of circuits. This approach implanted in the MATLAB program permits us to benefit from this powerful tool for which this application is the principle subject; and presents a very interesting capacity of interactive work for the user. This method applied in an actual static converter simulator gives very good results, and possess an appreciable advantage concerning speed of calculation, and the precision and viability of the results obtained. The illustration of the formalism proposed is tested on a three phase system assuring an alternative-continuous transformation based on an optimisation of the current spectrum quality entering by the injection of the third harmonic (Minnesota converter).