Security constrained optimal dispatch for electricity markets

• US 7,349,887 B2
• Filed: 03/10/2003
• Issued: 03/25/2008
• Est. Priority Date: 03/11/2002
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens Power Transmission & Distribution Incorporated (Siemens AG)
• Inventors: Peljto, Haso
• Primary Examiner(s): Borissov; Igor N.
• Application Number:
  US10/384,983
• Publication Number:
  US 20040024685A1
• Time in Patent Office: 1,842 Days
• Field of Search: 705/37, 705/412, 705/1, 705/7, 705/8, 705/10, 705/26, 705/27, 700/286, 700/291
• US Class Current: 705/412
• CPC Class Codes: G06Q 30/06 Buying, selling or leasing transactions
• CPC Class Codes: G06Q 40/04 Trading; Exchange, e.g. stocks, commodities, derivatives or currency exchange
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• CPC Class Codes: H02J 3/008 involving trading of energy or energy transmission rights
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 10/50 Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 50/10 Energy trading, including energy flowing from end-user application to grid

Abstract

The present invention is an apparatus for optimizing security constrained dispatch and pricing for the wholesale energy trading market. The imbalance market uniquely requires a real-time market for bidding and for providing the energy generation adjustments required to satisfy the imbalance. The present invention address the above noted needs by providing a real-time imbalance engine to support and implement the equitable imbalance requirement via a computer system implementation. Additionally, the present invention allows the market generators and loads to provide electronic bids for resolution while considering constraints on the demand and supply system.

Claims

1. Computer readable medium containing program

instructions recorded therein, which, when executed by a computer, causes the computer to implement a method for balancing energy generation and energy load in an energy imbalance market of an energy distribution system separate from a bilateral energy trading market and a dedicated regulation function of the energy distribution system, the energy distribution system including an energy distribution region subdivided into a plurality of different control areas including imbalance market participants, said method comprising:

receiving from a plurality of imbalance market participants, including energy generation participants and energy consuming load participants in an energy distribution region, energy supply and energy demand requirements for imbalance energy in an energy imbalance market; and

determining optimal dispatch of energy generation and energy load for each imbalance market participant for balancing generation and load imbalances in the imbalance market responsive to security constraints of at least one market participant and further responsive to one or more cost functions associated with the generation or consumption of energy over a time interval, wherein the one or more cost functions relate to a plurality of the energy generation participants and energy consuming load participants, wherein determining optimal dispatch is based on the costs of unit spinning reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{unit}\in <br><br>G}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{unit}}^t\right),$

wherein t is a time interval of a time period T, unit is one of a group of energy generators G, C_{Re s}^t is an operating cost function of spinning reserve costs for the time interval t, and Re g_unit^t is a unit spinning reserve for the time interval t; and

load spinning reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{load}\in <br><br>L}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{load}}^t\right),$

wherein t is the time interval of time period T, load is one of the group of energy loads L, C_{Re s}^t is an operating cost function of spinning reserve costs for the time interval t, and Re g_load^t is a load spinning reserve for the time interval t; and

generating balancing dispatch instructions responsive to the determined optimal dispatch of energy generation and energy load for each imbalance market participants for use in controlling their respective energy generation and energy load to remedy energy generation and energy load imbalances in the imbalance market other than the use of a bilateral energy trading market and a dedicated regulation function of the energy distribution system.

2. The computer readable medium of claim 1, wherein said security constraint is the market participant energy limit.

3. The computer readable medium of claim 1, wherein said security constraint is the load energy limit.

4. The computer readable medium of claim 1, wherein said security constraint is the market participant regulation availability.

5. The computer readable medium of claim 1, wherein said security constraint is market participant regulation range.

6. The computer readable medium of claim 1, wherein said security constraint is the market participant spinning reserve limit.

7. The computer readable medium of claim 1, wherein said security constraint is the load spinning reserve limit.

8. The computer readable medium of claim 1, wherein said security constraint is the market participant non-spinning reserve limit.

9. The computer readable medium of claim 1, wherein said security constraint is the market participant capacity limit.

10. The computer readable medium of claim 1, wherein said security constraint is the load capacity limit.

11. The computer readable medium of claim 1, wherein the computer code for determining optimal dispatch of energy

12. The computer readable medium of claim 1 wherein said one or more cost functions relating to said plurality of generation units and loads further relate to one or more of reserve regions, generation zones and load zones.

13. A method for balancing energy generation and energy load in an energy imbalance market of an energy distribution system separate from a bilateral energy trading market and a dedicated regulation function of the energy distribution system, the energy distribution system including an energy distribution region subdivided into a plurality of different control areas including imbalance market participants, the method comprising:

receiving from a plurality of imbalance market participants, including energy generation participants and energy consuming load participants in an energy distribution region, energy supply and energy demand requirements for imbalance energy in an energy imbalance market;

determining optimal dispatch of energy generation and energy load for each imbalance market participant for balancing generation and load imbalances in the imbalance market responsive to security constraints of at least one market participant and further responsive to one or more cost functions associated with the generation or consumption of energy over a time interval, wherein the one or more cost functions relate to a plurality of the energy generation participants and energy consuming load participants, wherein determining optimal dispatch is based on the costs of unit spinning reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{unit}\in <br><br>G}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{unit}}^t\right),$

wherein t is a time interval of a time period T, unit is one of a group of energy generators G, C_{Re s}^t is an operating cost function of spinning reserve costs for the time interval t, and Re g_unit^t is a unit spinning reserve for the time interval t; and

load spinning reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{load}\in <br><br>L}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{load}}^t\right),$

wherein t is the time interval of time period T, load is one of the group of energy loads L, C_{Re s}^t is an operating cost function of spinning reserve costs for the time interval t, and Re g_load^t is a load spinning reserve for the time interval t; and

generating balancing dispatch instructions responsive to the determined optimal dispatch of energy generation and energy load for each imbalance market participant for use in controlling their respective energy generation and energy load to remedy energy generation and energy load imbalances in the imbalance market other than the use of a bilateral energy trading market and a dedicated regulation function of the energy distribution system.

14. A system for balancing energy generation and energy load in an energy imbalance market of an energy distribution system separate from a bilateral energy trading market and a dedicated regulation function of the energy distribution system, the energy distribution system including an energy distribution region subdivided into a plurality of different control areas including imbalance market participants, the system comprising:

a database; and

a processor configured for;

receiving from a plurality of imbalance market participants, including energy generation participants and energy consuming load participants in an energy distribution region, energy supply and energy demand requirements for imbalance energy in an energy imbalance market;

determining optimal dispatch of energy generation and energy load for each imbalance market participant for balancing generation and load imbalances in the imbalance market responsive to security constraints of at least one market participant and further responsive to one or more cost functions associated with the generation or consumption of energy over a time interval, wherein the one or more cost functions relate to a plurality of the energy generation participants and energy consuming load participants, wherein determining optimal dispatch is based on the costs of unit spinning reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{unit}\in <br><br>G}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{unit}}^t\right),$

wherein t is a time interval of a time period T, unit is one of a group of energy generators G, C^t_{Re s}is an operating cost function of spinning reserve costs for the time interval t, and Re g^t_unit is a unit spinning reserve for the time interval t; and

load spinning

reserve according to the relationship;

$\underset{t\in <br><br>T}{\sum <br><br>}<br><br><br><br>\underset{\mathrm{load}\in <br><br>L}{\sum <br><br>}<br><br><br><br>C_{\mathrm{Res}}^t<br><br>\left({\mathrm{Res}}_{\mathrm{load}}^t\right),$

wherein t is the time interval of time period T, load is one of the group of energy loads L, C^t_{Re s} is an operating cost function of spinning reserve costs for the time interval t, and Re g^t_load is a load spinning reserve for the time interval t; and

generating balancing dispatch instructions responsive to the determined optimal dispatch of energy generation and energy load for each imbalance market participant for use in controlling their respective energy generation and energy load to remedy energy generation and energy load imbalances in the imbalance market other than the use of a bilateral energy trading market and a dedicated regulation function of the energy distribution system.