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Enron Mail |
Kevin,
In my previous e-mail I said the sampling frequency will affect the final result when it comes to calculating payment for consumed power. I have modeled the impact of frequency. This model demonstrates that the frequency is significant in the final answer. Take a look at the column totals for each measurement frequency. In my e-mail I referenced the SCADA system and did not include the sub station as it was not my intention to include a reference to the substation. I agree that we can integrate the values at the substation to get a total net power but this ignores the constraint the utility is introducing, chiefly that they want to be paid for consumed power at a different rate than the rate they pay for power. In the model you will find 30 time intervals for measurement. They can be whatever intervals you want. Then there are measurement frequencies which are defined in terms of the intervals. Since the utility requires that we pay for consumed power you can see we may have intervals where we have consumed power but don't pay anything because during the same interval we net positive power. Conversely the opposite is also true. I set this up with random numbers ranging from -25 to 100 to illustrate many scenarios. Regards, Hollis
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