06-24-2019, 12:09 PM

An extract from Energy Analysis Program, U.S. DoE, Lawrence Berkeley Laboratory {Applied Science Division UoC} LBL-19750, June 1984 (65 pgs.)

One way to characterize the cost structure of an electrical generating system is through a Load Duration Curve (LDC).

…

4. Deriving an LDC …

A common method of estimating the LDC of a given system is to use a normal approximation. This method treats the LDC as a cumulative normal function laid on its side. The mean of the distribution is the load factor, LF, of the system and the flatness of the curve is set by assuming that the peak is some number of standard deviations, SD, above the mean. This number of standard deviations we have called the rule of thumb, r, and a commonly used value for r is 3.1.

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Appendix 2 contains a calculator program, NAPPROX that generates LDC's by this procedure. Both programs in this report are written for a HP41CV with SIZE 100, and will also run on a 41C with sufficient storage.

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Appendix 2

PROGRAM TO GENERATE AN LDC USING THE NORMAL APPROXIMATION

This program uses the polynomial approximation to the cumulative normal found in HP1C Stat Pack Handbook, pp 66-67.

…

Appendix 5 (ii)

PROGRAM TO GENERATE AN LDC BY THE FINE METHOD

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Interesting application?

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One way to characterize the cost structure of an electrical generating system is through a Load Duration Curve (LDC).

…

4. Deriving an LDC …

A common method of estimating the LDC of a given system is to use a normal approximation. This method treats the LDC as a cumulative normal function laid on its side. The mean of the distribution is the load factor, LF, of the system and the flatness of the curve is set by assuming that the peak is some number of standard deviations, SD, above the mean. This number of standard deviations we have called the rule of thumb, r, and a commonly used value for r is 3.1.

…

Appendix 2 contains a calculator program, NAPPROX that generates LDC's by this procedure. Both programs in this report are written for a HP41CV with SIZE 100, and will also run on a 41C with sufficient storage.

…

Appendix 2

PROGRAM TO GENERATE AN LDC USING THE NORMAL APPROXIMATION

This program uses the polynomial approximation to the cumulative normal found in HP1C Stat Pack Handbook, pp 66-67.

…

Appendix 5 (ii)

PROGRAM TO GENERATE AN LDC BY THE FINE METHOD

…

Interesting application?

BEST!

SlideRule