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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 high-frequency 
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 
CONTROLLER CIRCUIT: 
 PIC controller 
OUTPUT: 
 Hardware 
 Simulation 
TOOLS: 
 MP Lab 
 Matlab/simulink 
Converter LC filter Output 
Driver unit 
PIC controller

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  • 1. 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 high-frequency 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:
  • 2. hybrid battery–ultracapacitor dc power source CONTROLLER CIRCUIT:  PIC controller OUTPUT:  Hardware  Simulation TOOLS:  MP Lab  Matlab/simulink Converter LC filter Output Driver unit PIC controller