A LOW COMPLEXITY CONTROL SYSTEM FOR A
HYBRID DC POWER SOURCE BASED ON
ULTRACAPACITOR–LEAD–ACID BATTERY
CONFIGURATION
ABSTRACT:
A dc hybrid power source based on the combination of
ultracapacitor and lead–acid battery is considered in this project. The various control
systems for such hybrid power source reported in the technical literature thus far are
rather complex. A low complexity control system for such hybrid power source is
proposed in this project. The key feature of the proposed control system is its
capability to maintain operation of the hybrid power source within all important
operational limits. The proposed control system allows one to allocate the highfrequency current demands to the ultracapacitor and specify the current limits for both
the battery and the ultracapacitor. It also maintains operation of the battery within its
state of charge limits and the ultracapacitor voltage at a predefined value while
charging the ultracapacitor from the battery rather than from the common dc bus.
BLOCK DIAGRAM:
hybrid battery–ultracapacitor
dc power source
Converter
Driver unit
PIC controller
CONTROLLER CIRCUIT:

PIC controller
OUTPUT:

Hardware

Simulation
TOOLS:

MP Lab

Matlab/simulink
LC filter
Output