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Energy Power System

Energy Power System. Electricity. Electricity is the flow of electrons through a conductor Electricity will only move through a closed circuit, if the circuit is broken the flow of electrons stops. Electricity (cont.).

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Energy Power System

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  1. Energy Power System

  2. Electricity • Electricity is the flow of electrons through a conductor • Electricity will only move through a closed circuit, if the circuit is broken the flow of electrons stops

  3. Electricity (cont.) • Voltage - Electric potential or potential difference, provided by the battery, expressed in volts • Amperage - The strength of an electric current, flows through the conductors to the load, expressed in amperes • Resistance - Is present in any load, expressed in ohms

  4. Light to Power • Solar Panels collect sunlight and convert them into electrical power • For maximum power solar arrays need to be perpendicular to the light rays hitting them.

  5. Orbit Cycle • During the 30 minute eclipse period the batteries supply power • While in insolation period the solar arrays provide power while the batteries charge for the next eclipse period

  6. Primary and Secondary power • Primary power is high voltage power generated at a centralized source • Before power is delivered to users it is stepped down by a transformer to a set voltage (secondary power) • Secondary power is then delivered to the user

  7. System Overview • Internal and external systems • Internal system distributes secondary power • External distributes primary power • 8 identical channels of power (0-7) • Each channel supplies 100 amps of current

  8. Internal EPS • Loads, RPDA, SPDA, DDCU, MBSU, ICC • Converts primary power to secondary power • Routes secondary power to any internal systems

  9. Loads • A load is anything that needs electricity to function. • Computers, Lights, Pumps, etc. • Each load requires a certain current (amps) which is specific to that device • Not all loads are physically inside the station, but all are supplied by the same internal distribution network

  10. SPDA/RPDA/DDCU • Secondary Power Distribution Assembly • Supports a single channel of power • A is even channel B is odd channel • Routes power to one RPDA and six loads • Reserve Power Distribution Assembly • Routes power to six loads • Direct current to Direct current Converter Unit • This is the unit that converts primary power (~160 V dc) to secondary power (~124 V dc)

  11. MBSU/ICC • Main Buss Switching Unit • Each support 2 channels of power with a total of 200 amps • Routes power to two SPDAs • Interconnecting Cables • Create a bridge for two or more MBSUs to share power across them

  12. External EPS • SARJ, IEA, ECU, SSU, PCU, BGA, PVA • Produces primary power from the solar arrays, and stores power in batteries for eclipse phase

  13. SARJ • Solar Alpha Rotary Joint • Rotates 4 channels of power at one time • Controls rotation parallel to the main station truss

  14. IEA • Integrated Equipment Assembly • Battery Charge Discharge Unit (BCDU) • When signaled by the ECU the BCDU begins charging or discharging the batteries • Batteries (BAT) • Batteries store power for use during the eclipse phase of the station’s orbit

  15. IEA (continued) • Direct Current Switching Unit (DCSU) • Routes power from BGA to batteries, IEA, and Internal system • Direct current to Direct current Converter Unit (DDCU) • Provides Secondary power for IEA components only.

  16. IEA Thermal control system • IEA has a self contained thermal control system for each channel • Small radiators under each IEA dissipate heat from the SSU as well as batteries and other IEA components • This system functions in the same manner as the main TCS for the station • Pump and Flow Control Subassembly (PFCS) and Photovoltaic Radiator (PVR)

  17. ECU/SSU • Electronic Control Unit • Manages when to charge and discharge the batteries • Sequential Shunt Unit • Shunts any excess power generated as heat • Small radiator beneath each PVA radiates heat

  18. Grounding • To prevent electricity from arcing across the station all electrical devices are grounded to the main truss. • Plasma Contractor Unit (PCU) • Emits a stream of plasma to ground the space station’s main truss to space • Prevents arcing to any external spacecraft during docking or EVA

  19. BGA/PVA • Beta Gimbal Assembly • Rotates one channel of power per BGA • Controls rotation perpendicular to the main station truss • Photovoltaic Array • Collects sunlight and converts it into electrical power

  20. Warning Signs of a SOBE • Red indicator light on the system wall • Loss of Power (I.e. lights or computer unexpectedly shut down) • Warning through HAL or other system • Contingency of another SOBE

  21. Things to check during a SOBE • For maximum power the panels must be perpendicular to the sunlight, if misaligned they may not produce enough power • There are many points were power can be stopped, be sure to check them all

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