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Generic Settlement Examples

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Strategic Solutions for the Electricity Industry. Barker, Dunn & Rossi, Inc. ... Barker, Dunn & Rossi, Inc. 2. BDR. Two Sets of Settlement Examples. Three bus ... – PowerPoint PPT presentation

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Title: Generic Settlement Examples


1
Generic Settlement Examples
  • September 30, 2003
  • Pamela Kozlowski
  • Barker, Dunn Rossi, Inc.

2
Two Sets of Settlement Examples
  • Three bus settlement examples
  • Bilateral Contracts
  • Six bus settlement examples
  • Bilateral Contracts
  • Congestion Revenue Rights (CRRs)
  • Introduces Zones and Hubs

3
Three Bus Settlement Examples
4
Three bus power system description
  • 3 Busses 1 through 3
  • 2 Loads
  • 3 Generators
  • 3 Transmission Lines
  • 75 MW thermal limit on line from Bus 1 to Bus 3
  • Ignore losses (emphasizes congestion impacts on
    LMPs)

5
Three bus power system generation offers
  • Generator 1 10/MWh
  • Generator 2 12/MWh
  • Generator 3 20/MWh

6
Three Bus Settlement Examples
  • Examples developed to illustrate
  • who pays congestion costs and
  • impact of bilateral contracts on such congestion
    costs
  • Examples build upon one another
  • Examples assume DA security constrained dispatch
    with no deviations in real-time

7
Three Bus Settlement Examples Description
  • No congestion
  • Case without bilateral contracts
  • Case with bilateral contracts
  • Case A
  • Congestion with bilateral contracts delivered to
    load
  • Case B
  • Congestion with bilateral contracts FOB

8
Three bus power system overview no congestion
9
No Congestion Case ERCOT Settlement
10
No Congestion Case with Bilateral Contracts
  • G1 has a contract to provide 25 MW of delivered
    power to L3 _at_ 15/MWh
  • G2 has a contract to to provide 25 MW of
    delivered power to L3 _at_ 15/MWh
  • Bilateral schedules are submitted
  • G1 to L3 of 25 MW
  • G2 to L3 of 25 MW

11
No Congestion Case with Bilateral Contracts
ERCOT Settlement
12
Congestion Case A with Bilateral Contracts
(delivered to load)
  • Increase load at Bus 3 from 50 MW to 100 MW
  • Same bilateral contracts as in the case with no
    congestion
  • G1 has a contract to provide 25 MW of delivered
    power to L3 _at_ 15/MWh
  • G2 has a contract to to provide 25 MW of
    delivered power to L3 _at_ 15/MWh
  • Bilateral schedules are submitted to ERCOT
  • G1 to L3 of 25 MW
  • G2 to L3 of 25 MW

13
Congestion Case A Unconstrained Flows
14
Congestion Case A Security Constrained Flows
15
Congestion Case A Why is Bus 3 price 14/MWh
  • The LMP at bus 3 equals the marginal cost to
    supply 1 more MW of energy to that bus
  • Increase load at Bus 3 from 100 MW to 101 MW (see
    next slide)
  • To supply 1 more MW of energy to Bus 3 increases
    the total cost from 1,550 to 1,564 1,564 -
    1,550 14
  • To supply 1 more MW of energy to Bus 3 the
    generator dispatch changes as follows
  • Generator 1 backs down by 1 MW (from 125 to 124
    MWs) at 10/MWh and
  • Generator 2 increases by 2 MW (from 25 to 27 MWs)
    at 12/MWh
  • (-1MW)(10/MWh) (2MW)(12/MWh) 14/MWh
  • The marginal cost to supply 1 more MW of energy
    to Bus 3 is 14/MWh

16
One-line showing determination of Marginal Price
at Bus 3
17
Congestion Case A with Bilateral Contracts
(delivered to load) ERCOT Settlement
18
Case A DA Net Settlement by Entity including
Bilateral Contracts (Settle at Load, Bus 3)
19
Congestion Case B with Bilateral Contracts (FOB)
  • Same as Congestion Case A, except the bilateral
    contracts are FOB
  • G1 has a contract to provide 25 MW of FOB power
    to L3 _at_ 12.00/MWh
  • G2 has a contract to to provide 25 MW of FOB
    power to L3 _at_ 12.00/MWh
  • Bilateral schedules are submitted to ERCOT
  • G1 to L3 of 25 MW
  • G2 to L3 of 25 MW

20
Congestion Case B with Bilateral Contracts (FOB)
ERCOT Settlement
21
Case B DA Net Settlement by Entity including
Bilateral Contracts (Settle FOB)
22
Three Bus Examples - Summary
23
Six Bus Settlement Examples
24
Six bus power system - overview
Load Zone X
Hub
Load Zone Y
25
Six bus power system description
  • 6 Busses A through F
  • 4 Loads LB, LD, LE and LF
  • 2 Load Zones
  • LB and LD are in Zone X
  • LE and LF are in Zone Y
  • Load zone price equals load weighted average of
    prices at load nodes within the zone
  • 5 Generators G1 through G5
  • 8 Transmission Lines
  • 250 MW thermal limit on line A-B
  • 1 Hub
  • Defined by Busses C and E
  • Hub price equals arithmetic average of prices at
    nodes that make up the hub
  • Ignore losses (emphasizes congestion impacts on
    LMPs)

26
Some basic model characteristics
  • Generators
  • Each has five increasing incremental prices (see
    following table)
  • The following diagrams only show the price of the
    last block cleared/dispatched
  • Each Generator is capable of being dispatched in
    economic order over its entire range
  • Loads
  • Each Load is firm (non-price responsive)
  • Total Load LB at Bus B will be increased later to
    force congestion
  • Transmission
  • Line from Bus A to Bus B near limit

27
Generator data
Piecewise Linear Curve Model
28
6 Bus Settlement Examples
  • Examples developed to illustrate
  • who pays congestion costs and
  • impact of bilateral contracts and CRRs on such
    congestion costs
  • Examples build upon one another
  • Examples assume DA security constrained dispatch
    with no deviations in real-time

29
Six Bus Settlement Examples - Description
30
Example 1 Day-Ahead Solution Flows
31
Example 1 LMPs for Load Zones and Hub
32
Example 1 ERCOT DA settlement
33
Example 1a Bilateral Contracts
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at
    ZoneX
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus F

34
Example 1a DA Net Settlement by Entity,
including Bilateral Contracts
35
Example 1a Observations
  • DA LMPs at all locations the same, 23/MWh
  • Effective DA price for
  • Generator 1 7,440/400MWh 18.60/MWh
  • Generator 5, paid 1,260 for no production
  • Load B 8,700/400MWh 21.75/MWh
  • No congestion
  • No CRR settlement

36
Example 2
  • In Example 2, the Load at Bus B is increased from
    400 MW to 600 MW

37
Example 2 DA Solution Unconstrained Flows
38
Example 2 DA Solution Security Constrained
Flows
39
Example 2 LMPs for Load Zones and Hub
40
Example 2 ERCOT DA settlement
41
Example 2a Bilateral Contracts (Settle at Zone)
  • Bilateral Contracts are the same as in Example 1
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at
    ZoneX
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus F

42
Example 2a DA Net Settlement by Entity,
including Bilateral Contracts (Settle at Zone)
43
Example 2b Bilateral Contracts (Settle at
Generator)
  • Bilateral contracts are the same as in Example
    2a, except Load LBs bilateral contract with G1
    settles at Bus A instead of at ZoneX
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at Bus
    A
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus F

44
Example 2b DA Net Settlement by Entity,
including Bilateral Contracts (Settle at
Generator)
45
Example 2c Bilateral Contracts (Settle at
Generator) and Load has CRRs
  • Bilateral contracts are the same as in Example 2b
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at Bus
    A
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus
    F
  • Load LB acquires 240 MW CRR from Bus A to Zone X

46
Example 2c DA Net Settlement by Entity,
including Bilateral Contracts (Settle at
Generator) CRRs
47
Example 2d Bilateral Contracts (Settle at Hub)
  • Bilateral contracts are the same as in Example
    2a, 2b 2c, except Load LBs bilateral contract
    with G1 settles at the Hub
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at Hub
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus
    F

48
Example 2d DA Net Settlement by Entity,
including Bilateral Contracts (Settle at Hub)
49
Example 2e Bilateral Contracts (Settle at Hub)
and Load and Generator have CRRs
  • Bilateral contracts are the same as in Example 2d
  • Load LB has the following bilateral contracts for
    which only MW amounts are reported to ERCOT
  • to buy 220 MW of supply _at_ 15/MWh from G1 at Hub
  • to buy 180 MW of supply _at_ 30/MWh from G5 at Bus
    F
  • G1 acquires 220 MW CRR from Bus A to Hub
  • Load LB acquires 240 MW CRR from Hub to Zone X

50
Example 2e DA Net Settlement by Entity,
including Bilateral Contracts (Settle at Hub)
CRRs
51
Six Bus Examples 1 and 2 Observations
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