| Abstract |
The paper presents the iterative procedure employed
by simulation program APoSIS to calculate the steady-state
behaviour of power converter based systems. APoSIS (Advanced
Power System Interactive Simulator) is an interactive program,
developed for 32-bit Windows operating system platforms, useful
to analyze the steady-state behaviour of power systems including
static converters. After the definition of the power system
structure and the values of its parameters by means of a netlist
description, APoSIS allows at first the determination of the
steady-state values of the system state variables at a prefixed
initial instant; successively, the program can calculate several
functions characterizing the steady-state behaviour, such as the
mean value and the harmonic coefficients of the most
significant variables. In addition, APoSIS can also analyzes the
stability of the power system and calculates the dynamic
evolution produced by a disturbance or a parametric variation.
After a short recall to the structure of APoSIS, the paper
explains the iterative procedure adopted to determine the steadystate
values of the state variables, at a prefixed initial instant,
and the timings when some commutation instants depend on the
system operating conditions. Finally, the approach employed for
the computation of the mean value and the harmonic
coefficients of the most significant variables is presented. |
