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Introduction

Examples of Hypothetical Settlement Approaches for Residential Premises with Photovoltaic (PV) Generation ERCOT Load Profiling January 23, 2008. Introduction. Introduction.

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Introduction

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  1. Examples of Hypothetical Settlement Approaches for Residential Premises with Photovoltaic (PV) Generation ERCOT Load ProfilingJanuary 23, 2008

  2. Introduction

  3. Introduction Given the outlook for measuring the outflow to the grid from residential photovoltaic (PV) arrays, how could that energy be settled? Some possibilities for allocating the PV-generated outflows: 1. Spread the energy evenly over the entire settlement period 2. Spread the energy evenly over daylight hours 3. Spread the energy over the peak PV-generating hours 4. Apply the scaled shape of a PV profile 5. Determine the difference between a PV profile and a scaled standard load profile to derive both a load shape and a generation shape Following are examples for a very low usage residential high winter ratio (RESHIWR) ESI ID in the North Central weather zone.

  4. Spread energy evenly over the entire day

  5. Spread energy evenly over the entire day

  6. Spread energy evenly over daylight hours

  7. Spread energy evenly over daylight hours

  8. Spread energy evenly over peak PV hours

  9. Spread energy evenly over peak PV hours

  10. PV profile models • If PV profile models were created, PV profiles could be used with or without the standard load profiles to estimate the shape of the PV output to the grid. • To estimate the shape of the PV output to the grid without using a standard load profile, simply scale the PV profile to the ‘kWh out’ value. • To estimate the shape of the PV output to the grid using a standard load profile, scale the standard profile so it can be compared to the PV profile.

  11. Apply the shape of the PV profile

  12. Apply the shape of the PV profile

  13. Apply the shape of the PV profile

  14. Apply the difference from PV profile

  15. Apply the difference from PV profile

  16. Settlement of load and generation

  17. PV profile models • PV profiles would also allow for the settlement load shape to allocate the PV-generated energy that was used on site, but not output to the grid. • More on PV profile models • Q: Can we use our cloud cover data to predict PV output? • A: A quick glance shows there may not be a clear relationship...

  18. Cloud cover & PV output for a Dallas site

  19. Cloud cover & PV output for an Austin site

  20. PV profile models • Are there significant differences in PV output among different times of the year? A quick glance...

  21. PV output by season

  22. PV output by month

  23. PV profile models • Where to go from here? Other questions?

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