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Power Locator

IETF 82 – OPSAWG November 15, 2011. Power Locator. Bruce Nordman Lawrence Berkeley National Laboratory BNordman@LBL.gov. Power distribution in m y building. Many submeters. Many circuits. Location. How do I know “where” * in a building each specific device is?

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Power Locator

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  1. IETF 82 – OPSAWG November 15, 2011 Power Locator Bruce Nordman Lawrence Berkeley National Laboratory BNordman@LBL.gov

  2. Power distribution in my building • Many submeters • Many circuits

  3. Location • How do I know “where”* in a building each specific device is? *“where” is location in power distribution tree • Complex buildings have many circuits and many individual devices • Knowing location needed for monitoring and control • Manual methods are possible • Automatic would be cheaper and more reliable

  4. Sample device – PCSix days of data • Max power in middle of night (likely backup or similar activity) • Max is about 30% above typical / idle • Most of time, power is relatively constant • Difference provides opportunity for communication

  5. Locator service exampleSame PC – Four hours of data • 10 W signal added to ~65 W idle level • Present during alternate minutes

  6. Algorithm • Begin reading all submeters synchronously at fixed intervals • Request target device to enter locator mode with identical timing • Analyze meter data until signal is visible in one (or more) meter(s) • Terminate locator mode

  7. Synthetic submeter data – 40 PCs • Challenge: Find a 10 W signal in > 2 kW readings

  8. Submeter data – cumulative averageTime series data divided into odd/even series • Averages converge to < 1 W within about 5 minutes • 10 W signal easily visible

  9. Locator request details • Bitmap of signal (and length) • can be more complex than 10101010….. • Period • length of time of each bit • Duration • number of periods to signal for • Can use SNMP • Mode begins immediately

  10. Thank you

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