1. Advanced High Power Systems for
Geostationary Satellites
Authors
Lawal Lasisi S & Chatein Chris R
Reference
IEEE Computer Society 2012 Volume 4
Presented By
Md. Saifur Rahman
Roll: 0903027

2. Outlines
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Introduction
Conventional Satellite Power System
Introduction of New Power System
Methodology and Improvement of Techniques
Design Developments
Result and Discussion

3. Introduction
• Increasing demand for broadband services from
Geostationary Communication Satellites (GCS) and
the high power required to cope with this situation.
• Increasing the power hungry repeater components
of GCS as high power amplifier, large mass and
solar arrays required high power requirements.
• Advanced modular power methodologies and
technologies for large spacecraft power subsystem
and the importance of improvements of several
power developing components.

4. Conventional System

5. Conventional System

6. Introduction of New Power System
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PCU: Power Control Unit
BCR: Battery Charge Regulator
BDR: Battery Discharge Regulator
S3R: Sequential Switching Shunt Regulator
MEA: Main Error Amplifier

7. Methodology & Improvement of
Technique
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Advance Solar Cells
Solar Array Size and Structure
Advanced Solar Array Drive Assembly (SADA)
Improved Battery Performance
Power Control Unit (PCU)
Use of Electric Propulsion system and Thruster
Use of Deployable thermal Radiators
Interface Requirements and Harness
Pyrotechnique Integration System

8. Advanced Solar Cells
Improvement in solar cells using triple junction cells
provides efficient energy conversion and greater output
with the same cell area and mass.
Solar Array Size and Structure:
To accommodate the required solar energy generation
for higher power spacecraft, solar array panels can now
be structured in such a manner the allows eight or more
panels by using advanced deployment techniques.

9. Advanced Solar Cell Technology
Figure 1: IV-characteristic for the current best fourjunction solar cell under AM1.5d ASTM G173-03
spectrum at a concentration of 297 suns.
Read more at: http://phys.org/news/2013-09-worldsolar-cell-efficiency.html#jCp
In Sep 24 2013
World record solar cell
with 44.7%
efficiency, made up of four
solar sub cells based on
III-V compound
semiconductors

10. Advanced Solar Array Drive Assembly (SADA)
The mechanism caters for high current demand using
advanced ring technology with the required reliability
and mechanical support for the solar arrays.
Power Control Unit (PCU)
This refers to all the equipments and the unit for control
protection , adjustment and inter facing with other sub
units and subsystems of the electrical power system.

11. Interface Requirements
Electrical Interface
Mechanical Interface
Thermal Interface
Harness Design
Pyrotechnique Integration System
The sub system is responsible for safe and reliable
operation of al Electro Explosive Devices meant for
deployment of satellite appendages such as antennas
and multiple solar array panels in high power system of
satellite

12. Design Development
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Reliable, advanced and economical
Adopting modular design which is standardized and serialized
Adopting a mature software engineering design process
System design requirements analysis, optimization, test with
iterative modifications
Mission requirements
Electrical power bus voltage for long time power requirements
Electrical power quality in terms of bus ripple voltage and bus
voltage characteristics during leap year and out of eclipse
Lifetime and reliability requirement
Mass, volume and cost
Structure and system arrangement consideration
Requirement of Electromagnetic Compatibility (EMC) and
Electromagnetic Interference (EMI)
Structural and Environmental Test requirement

13. Result and Colclusion
• New proposed power system can deliver high power as
25KW for Geostationary Satellite
• It supports for broadband communication and other
satellite based system
• Such High power communication satellites are
important to rejoins with heavy rainfall to minimize rain
attenuation
• High power system also improve the reception quality
of signals and High definition TV broadcasting

14. Thanks to All