Pspice Simulation of Power Electronics Circuit and Induction Motor Drives

Historically, simulation of transient phenomena related to power systems has been carried on using the electromagnetic transients program (EMTP) [1] or one of its variants, such as the alternative transient program (ATP) or electromagnetic transients for dc (EMTDC), which are all based on the trapezoidal integration rule and the nodal approach. These software packages use fixed-step algorithms, which yield excellent results for power systems free of any power electronics devices. However, the fixed-step algorithms do not adapt well to the presence of discontinuities, which are caused by the switching devices. Spice is a general-purpose circuit simulation program, which was developed at the University of California, Berkeley [2]. The Spice circuit simulation program has become an industry standard. The major advantage of using Spice in power electronics is that, with the same software, a particular circuit can be designed and analysed at different system and subsystem levels, i.e., at the levels of the power switch, the converter circuit, and converter systems, including feedback control. However, for higher levels of simulation, simplified models for the switch and the converter must be implemented, in order to minimise convergence problems and reduce the run times. There are several commercial version of Spice that operates on personal computer under several popular operating systems. One commercial version of