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International space station solar array wing on-orbit electrical performance degradation measured
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gustafson, Eric D. Kerslake, Thomas W. |
| Copyright Year | 2004 |
| Description | The port-side photovoltaic power module (P6) was activated on the International Space Station in December 2000. P6 provides electrical power to channels 2B and 4B to operate ISS power loads. A P6 is shown in the preceding photograph. This article highlights the work done at the NASA Glenn Research Center to calculate the on-orbit degradation of the P6 solar array wings (SAWs) using on-orbit data from December 2000 to February 2003. During early ISS operations, the 82 strings of photovoltaic cells that make up a SAW can provide much more power than is necessary to meet the demand. To deal with excess power, a sequential shunt unit successively shunts the current from the strings. This shunt current was the parameter chosen for the SAW performance degradation study for the following reasons: (1) it is based on a direct shunt current measurement in the sequential shunt unit, (2) the shunt current has a low temperature dependence that reduces the data correction error from using a computationally derived array temperature, and (3) the SSU shunt current is essentially the same as the SAW short-circuit current on a per-string basis. |
| File Size | 321745 |
| Page Count | 3 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20050215410 |
| Archival Resource Key | ark:/13960/t7hq8wv4j |
| Language | English |
| Publisher Date | 2004-05-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Instrumentation And Astrionics Temperature Dependence Performance Tests International Space Station Solar Arrays Short Circuit Currents Photovoltaic Cells Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
