Averaged Value Analysis of 24-Pulse Rectifiers for Aerospace Applications

چکیده مقاله

Multi-pulse transformer based or autotransformer based
diode rectifiers are usually used as front end converter in
aerospace applications. Compared to PWM active front end
converters, multi-pulse diode rectifiers are lighter, more reliable,
and in all represent a much lower cost solution. For power
system integration however, their switching action is still a
hindrance for system simulation, impedance measurements,
and AC and DC stability studies. For this reason, the usage and
development of average models has become a powerful system
design tool for aerospace applications, since this type of
model averages out the switching action of power converters,
rendering their software simulation models continuous and
hence ready for linearization and small-signal analyses. Due
to their internal control functions, power electronic converters
present ’constant power’ characteristics to their supply. These
types of loads are known as Constant Power Loads (CPLs).
Since CPLs have negative incremental input impedance, there
is a possibility of interaction, lightly damped oscillations
and instability between the supply and the CPL, or between
different CPLs sinking energy from one supply. This instability
issue has led to the need for more thorough analysis of systems
which are composed of multi-CPLs.