Advanced High Power Systems for Geostationary Satellites

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Advanced High Power Systems for Geostationary Satellites

  1. 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. 2. Outlines • • • • • • Introduction Conventional Satellite Power System Introduction of New Power System Methodology and Improvement of Techniques Design Developments Result and Discussion
  3. 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. 4. Conventional System
  5. 5. Conventional System
  6. 6. Introduction of New Power System • • • • • PCU: Power Control Unit BCR: Battery Charge Regulator BDR: Battery Discharge Regulator S3R: Sequential Switching Shunt Regulator MEA: Main Error Amplifier
  7. 7. Methodology & Improvement of Technique • • • • • • • • • 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. 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. 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. 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. 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. 12. Design Development • • • • • • • • • • • • 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. 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. 14. Thanks to All

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