A CPS1-driven market for Clearing/Settling
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A CPS1-driven market for Clearing/Settling Inadvertent Interchange Simulation from an 11-Day period of 17-control-area Western-Interconnection Jan/’02 hourly data. presented to Inadvertent Interchange Payback Taskforce North American Energy Standards Board by Robert Blohm Houston

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Presented to inadvertent interchange payback taskforce north american energy standards board

A CPS1-driven market for Clearing/Settling Inadvertent InterchangeSimulation from an 11-Day period of 17-control-area Western-Interconnection Jan/’02 hourly data

presented to

Inadvertent Interchange Payback Taskforce

North American Energy Standards Board

by Robert Blohm

Houston

December 10, 2003

Slide #


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1

Inadvertent Interchange is more than just energy

at the price of scheduled energy.

It’s also unscheduled

contribution or correction

to frequency error.


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Inadvertent is a vector in a state space

2

transmission loading component

energy

frequency control contribution


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3

b

>

0

>

U

0

+

10 b

-

10b

p

U

p

p

U

p

b

b

e

e

-

+

10 b

-

-

10 b

p

U

p

p

U

p

b

b

e

e

Dual pricing of unscheduled energy

Ambiguity along the diagonal.

Diagonal occurs only when frequency is high.

Off-diagonals occur only when frequency is low.

Revenue/Expense

Unscheduled

receive

good bad

part

energy part

sold

pay

bought


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4

Four possible combinations of

Priced Energy Component

and

Priced

Frequency Control Contribution

of Inadvertent Interchange


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5

Case 1: Frequency High and Control Area A “Leaning” on Rest of Interconnection for 200 MWh

1. Energy Component:

A pays the Interconnection $10/MWh energy price for 200 MWh =

-$ 2000

2. Frequency Control Contribution:

A receives from the Interconnection $15* of FCCp per MWh of Inadvertent = +$ 3000 for 200 MWh of Inadvertent Interchange that is opposite to the frequency error.

*FCCp per MWh would be less than $15 if the average frequency error were smaller.

3. Net Result:

A receives from the Interconnection a net total of $ 1000*.

*The net result could be a payment if the average frequency error is small enough.


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Case 2: Frequency High and Rest of Interconnection “Leaning” on Control Area A for 200 MWh

1. Energy Component:

A receives from the Interconnection $10/MWh energy price for 200 MWh = +$ 2000

2. Frequency Control Contribution:

A pays the Interconnection $15* of FCCp per MWh of Inadvertent =

-$ 3000 for 200 MWh of Inadvertent Interchange that is contributing to the frequency error.

*FCCp per MWh would be less than $15 if the average frequency error were smaller.

3. Net Result:

A pays the Interconnection a net total of $ 1000*.

*The net result could be a receipt if the average frequency error is small enough.


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7

Case 3: Frequency Low and Control Area A “Leaning” on Rest of Interconnection for 200 MWh

1. Energy Component:

A pays the Interconnection $20/MWh energy price for 200 MWh =

-$ 4000

2. Frequency Control Contribution:

A pays the Interconnection $15 of FCCp per MWh of Inadvertent =

-$ 3000 for 200 MWh of Inadvertent Interchange that is contributing to the frequency error.

3. Net Result:

A pays the Interconnection a combined total of -$ 7000.


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8

Case 4: Frequency Low and Rest of Interconnection “Leaning” on Control Area A for 200 MWh

1. Energy Component:

A receives from the Interconnection $20/MWh energy price for 200 MWh = +$ 4000

2. Frequency Control Contribution:

A receives from the Interconnection $15 of FCCp per MWh of Inadvertent = +$ 3000 for 200 MWh of Inadvertent Interchange that is opposite to the frequency error.

3. Net Result:

A receives from the Interconnection a combined total of +$ 7000.


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9

Summary of the 4 cases

Frequency:

High

Low

“Leaning”

by:

Case 3

A pays $7000

Case 1

A receives $1000

Control Area A

Rest of

Interconnection

Case 2

A pays $1000

Case 4

A receives $7000


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10

Animation of the Clearing/Settlement of

Frequency Control Contribution

based on data of an 11-day period in January 2002

on 17 control-area Western Interconnection:


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A Balancing Authority i's Frequency Control Contribution is a "2-dimensional average"

of Inadvertent and Frequency-error each weighted by Frequency error.

A "2-dimensional average" is the slope of a

line

from the

origin

through the

intersection

of

the

lines

intercepting the two averages.

I

4-period scatter of Balancing Authority i's

i

<Frequency-error, Inadvertent>

8

points

I

9

<

D

>

F

,

I

i

=

=

t

i

,

t

D

denoted by the 4 red dots

F

2

Slope is "2-dimensional average"

of

Inadvertent

&

Frequency-error

Drawing prepared

by Robert Blohm

4

July 5, 2003

i's Average Inadvertent

4

1

9

=

=

=

å

I

I

I

i

i

,

t

i

,

t

4

4

=

t

1

D

I

F

Period t

D

i

,

t

-

F

t

4

1

4

1 4 -2

2 1 -1

3 -4 4

Average Frequency-error

4

1

8

4

1

1

Sum = 2 9

D

D

=

D

=

=

å

F

F

F

t

t

4

2

=

t

1


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2

D

I

D

I

D

F

F

F

Period t

,

t

i

i

,

t

t

t

t

1 4 -2 -8 16

2 1 -1 -1 1

3 -4 4 -16 16

1

4

1

8

8

Sum = 2 9 -17 32

Slope is "2-dimensional average"

of

Inadvertent

&

Frequency-error

weighted by Frequency-error

i's Average Inadvertent

weighted by Frequency-error

4

1

-17

(

´

)

=

-4¼

=

=

=

å

I

I

D

F

I

D

F

i

i

,

t

t

,

t

i

t

4

4

=

t

1

A Balancing Authority i's Frequency Control Contribution is a "2-dimensional average"

of Inadvertent and Frequency-error each weighted by Frequency error.

A "2-dimensional average" is the slope of a

line

from the

origin

through the

intersection

of

the

lines

intercepting the two averages.

4-period scatter of Balancing Authority i's

<Frequency-error, Inadvertent>

points

<

D

>

F

,

I

t

i

,

t

denoted by the 4 red dots

Average Frequency-error

weighted by Frequency-error

I

i

4

1

(

´

)

2

D

D

=

D

=

=

D

8

å

F

F

F

F

8

t

t

t

4

=

t

1

DF

-4¼

I

t

i,t

=

=

8

2

D

F

t

D

-

F

8

2

8


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Good quadrant:

Inadvertent and frequency error

in opposite directions.

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Good quadrant:

Inadvertent and frequency error

in opposite directions.

Megawatt-Hours of Inadvertent

Frequency error in Hertz

-.03

-.02

-.01

+.01

+.02

+.03


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Slope of line is red control area’s Frequency Control Contribution. It is the two-dimensional average of red control area’s frequency-error-weighted Inadvertent and frequency-error-weighted frequency error.

Red control area’s 264 hourly-average Inadvertent and frequency error

Line is in the good quadrants:

so red control area gets paid for his

Frequency Control Contribution for

helping frequency.

Control Area 1 (CA 1)


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CA 2


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Slope of the black line is two-dimensional average of the combined control areas’ frequency-error-weighted Inadvertent and frequency-error-weighted frequency error.


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CA 3


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CA 4


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CA 5


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CA 6


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CA 7


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CA 8


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CA 9


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CA 10


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CA 11


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CA 12


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CA 13


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CA 14


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CA 15


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CA 16


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CA 17


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Lines’ slopes add up to zero slope of horizontal line.


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Positive slopes pay

Positive slopes pay

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Bad quadrant:

Inadvertent and frequency error

in the same direction.

Positive slopes pay


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Good quadrant:

Inadvertent and frequency error

in opposite directions.

Good quadrant:

Inadvertent and frequency error

in opposite directions.

Positive slopes pay to the negative slopes


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Positive slopes pay to the negative slopes and Frequency Control Contribution always clears.


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Market price of a distribution of points over time, not of a sharp point in time

53

  • Real-time transactions cannot be done moment-by-moment deterministically/deliberately

    • Time is too short

  • Real time performance must be managed, measured and valued as a statistical distribution

    • Classical physics versus quantum mechanics

      • joint-indeterminacy of position and momentum

    • Joint-indeterminacy of time-quantity and reliability-pricing

      • reliability pricing of a time average

“Computational Equivalence” (Wolfram/Mathematica): computational limitations in humans & physical nature


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Tiered real-time market

  • Three tiered market for frequency contribution

    • NERC, Balancing Authorities, local entities.

      • Frequency is a public good requiring an authority like NERC to drive the frequency-contribution markets by the threat of penalty.

        • This meets both a reliability and a markets objective

  • Balancing Authorities must settle their FCC monthly

    • Since inadvertents sum to zero by definition, Balancing Authorities always clear


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Tiered real-time market (cont.d)

  • Balancing Authorities must also comply with CPS frequency targeting, acting as agents subject to NERC penalty

    • FCC does not target frequency

    • NERC CPS penalty will prompt Balancing Authorities to trade their CPS rights instead of paying the penalty, the way DOE pollution penalties prompted the market for pollution rights.

      • To meet their monthly CPS scores, Balancing Authorities will trade their frequency control contributions as an alternative to buying options on frequency support


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Tiered real-time market (cont.d)

  • FCC is open and scalable to a market below Balancing Authorities

    • Balancing Authorities can apply FCC to their constituent entities to incent entities’ self-provision and good performance, thereby minimizing the Balancing Authority’s own local intervention


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Ancillary services markets

  • Ancillary services markets need to be developed as robust options markets

    • The option price is driven by volatility which is another way to capture/express Frequency Control Contribution


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Relation between CPS1

and

Frequency Control Contribution


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extends to all inadvertent the price of the trading & procurement of residual inadvertent done to get compliant with . The tolerance band limits and drives .

59


Boils down to

boils down to

where is a least-squares estimator of bias

60


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With bias , tolerance band and becomes

61


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monetization is equivalent to without bias obligation/tolerance: . monetization makes this equation hold because since and

62


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Trading/procurement of to get within the tolerance band drives the price of all


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p

64

CPS1

Approximate

Instantaneous

:

On average over the past year:

Probability

e

p

Annual standard

+

:

MW

, or

D

F

+

deviation of

D

F

:

in same direction as

(

)

Target

2

e

=

e

+

m

D

F

:

2

"No inadvertent allowed

RMS

(

)

D

F

D

F

m

:

Year's Mean of

in the direction of

D

F

:

1-minute average of

Frequency error when

Frequency error

"

-

D

³

e

F

<

e

e

:

+

B

0

Control area

i's bias

i

-

D

F

+

-50

50

(

mHz)

-

D

F

10

B

10

B

D

F

i

i

:

Control area

i's maximum allowed 1-minute average

tie-line

error (plus response obligation) in direction of the frequency error:

e

æ

ö

e

D

=

-

-

D

T

10

B

F

ç

÷

D

i

i

è

ø

F

:

One-year target probability density of 1-minute

averages of frequency error, adjusted for deviation of

the mean from 0


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‘scut is perpendicular to CPS1's cut/band.

Payments for traded s would sum to zero around CPS1'scut/band when .

There is excess demand for traded s outside CPS1's cut/band when

whence receipt ofreduces CPS1 penalty to incent BAs to get back inside.

CPS1

+

Isoquants

Isoquants

+

-

-

-

-

+

: buys FCC

or response

+

: buys

regulation

Vertical cut

Horizontal band

's vertical cut gets stretched right from the middle into CPS1's horizontal band.

BA outside his CPS1 cut/band buys enough from BAs & to get inside his CPS1

cut/band & avoid CPS1 penalty, and thereby helps set the settlement price .


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To Get

Hourly Decomposition of

Frequency Control Contribution:

Interpret

Frequency Control Contribution as an 11-day average of 1-hour Frequency Control Contributions


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FCCh(11 day* average):

*264 hours

FCCh(hour 1):

(Column K of spreadsheet)


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because Ii sum to 0 across the i’s.

||

since

1-hour FCCh sum to 0 across control areas i


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the 264-hour averages of 1-hour FCCh sum to 0 across the i’s.

||

||

||

Because 1-hour FCCh sum to 0 across the control areas i,


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Marginal FCC Cost

of

Inadvertent

as

Amount of

Frequency Control Contribution per MWh of Inadvertent


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FCCh(hour 1):

Marginal FCC cost

(in units of FCC1) of

Inadvertent Ii:

(Column F of spreadsheet)


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To avoid economic gaming

a continuous

Frequency Control Contribution value of Inadvertent Interchange

is needed because the

hourly Frequency Control Contribution

of Inadvertent Interchange

is often very big relative to the

Energy Component of

Inadvertent Interchange.


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Inadvertent Payments by/to (Green) Control Area 3

Assuming price of 10¢/MWh/Hz of FCC

For Energy +

For FCC =

=FCCt´ 10¢/MWh/Hz

Net

Day 1: Hour 4

Receive

$950 @$10/MWh

Pay

Receive

$469

$481 @ $5.06/MWh

=FCC4MCI3

Day 1: Hour 11

Receive

$3592

Pay

$722 @$20/MWh

Receive

$4314 @ $11.95/MWh

=FCC12MCI3

Day 6: Hour 2

Pay

Pay

$974

Receive

$1350 @$10/MWh

$2324 @ $17.21/MWh

=FCC146MCI3

Day 6: Hour 12

Pay

$2420 @$20/MWh

Pay

Pay

$4197

$1767 @ $14.60/MWh

=FCC156MCI3

11-day Average

$2.06/MWh

(Row 277 Column X of spreadsheet)


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