AncillaryServices.KirschenChapter5Slides.LTEdits.pdf
AncillaryServices.KirschenChapter5Slides.LTEdits.pdf
AncillaryServices.KirschenChapter5Slides.LTEdits.pdf
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Balancing Services…Continued<br />
Difference between power traded and power produced:<br />
• Market assumes generation (MW) remains constant over<br />
each trading period (e.g., each hour in day-ahead market)<br />
• In fact, generation (MW) varies over each trading period<br />
• Minor errors in control<br />
• Unit commitment issues (e.g., ramp constraints at ends of periods)<br />
• Generating unit outages can create large imbalances<br />
• Power traded in markets cannot track rapid intra-period<br />
fluctuations in generation<br />
© Daniel Kirschen & Leigh Tesfatsion 2011 18