| Abstract |
Power electronics based power systems are being
increasingly considered for transportation systems such as
land, sea/undersea, air, and space vehicles due to their
advantages in efficiency, performance, flexibility, and power
density. In order to have superior performance, these multiconverter
systems need to be rigorously regulated. Dynamic
response of tightly regulated power electronic converters in
distributed power electronic systems is similar to the
dynamic response of a constant power load (CPL), which
acts as negative impedance and destabilizes the DC bus and
the system. In order to mitigate the instability problem in
multi-converter systems, in this paper, we present a novel
digital technique to control DC/DC converters driving CPLs
in vehicular systems. The proposed method achieves the
output voltage regulation based on generating high and low
power pulses instead of conventional pulse width
modulation (PWM) techniques. It is simple, straight
forward, and easy to implement in specifically designed
integrated circuits (IC), digital signal processors (DSP), or
field programmable gate arrays (FPGA). Moreover, its
dynamic response is fast and robust. Simulation results of
applying the proposed method to a DC/DC buck-boost
converter confirm the analytical results. |
