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Mod_09_11: Explanatory Notes SEMO Market Development

Mod_09_11: Explanatory Notes SEMO Market Development. Intro. MSP Software does not model Loading Rates as operating range below Min Stable Generation not represented

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Mod_09_11: Explanatory Notes SEMO Market Development

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  1. Mod_09_11: Explanatory NotesSEMO Market Development 5thApr 2011

  2. Intro • MSP Software does not model Loading Rates as operating range below Min Stable Generation not represented • Rather than ignoring the effect of Loading Rates, Ramp Rates are used instead as an approximation to limit the rate of change during Start Up and Shutdown • However, the descriptions of these limits in the Code is not consistent and needs to be aligned

  3. Current Rules Start-Up and Shutdown limits are described differently. We believe this was an unintentional drafting error.

  4. AND option One option is to adopt AND rule used for Shutdown in the case of Start Up

  5. OR option Other option is to adopt OR rule used for Start Up in the case of Shutdown

  6. SEMO view • Ramp Rates (and Block Load) are used to approximate Loading Limits. • Min Stable Generation is only included to prevent a Unit being forced to operate below MSG as this would be infeasible. • Therefore, OR is most appropriate. • Shutdown should be changed from AND to OR to make Code internally consistent. • We believe this was a drafting error as Systems built this way already. • Mod_09_11 written on this basis

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