Method and apparatus for providing economic analysis of power generation and distribution

• US 7,474,080 B2
• Filed: 09/12/2007
• Issued: 01/06/2009
• Est. Priority Date: 06/25/2004
• Status: Active Grant

• Current Assignee: Emerson Process Management Power & Water Solutions Incorporated (Emerson Electric Company)
• Original Assignee: Emerson Process Management Power & Water Solutions Incorporated (Emerson Electric Company)
• Inventors: Huff, Frederick C., Francino, Peter N., Cheng, Xu
• Primary Examiner(s): Ponomarenko; Nicholas
• Assistant Examiner(s): Cuevas; Pedro J
• Application Number:
  US11/854,308
• Publication Number:
  US 20080004721A1
• Time in Patent Office: 482 Days
• Field of Search: 322/20, 322/24, 290/40.B, 290/40.R, 703/3, 705/412
• US Class Current: 322/24
• CPC Class Codes: G06Q 10/04 Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem" market predictions or forecasting for commercial activities G06Q30/0202
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 3/0075 for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
• CPC Class Codes: H02J 3/46 Controlling of the sharing of output between the generators, converters, or transformers
• CPC Class Codes: H02J 3/50 Controlling the sharing of the out-of-phase component
• CPC Class Codes: H02P 9/105 for increasing the stability
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

An economic dispatch program optimally allocates load demand specifying real power and reactive power to be generated by a power plant among various power generators in a manner so that each of the power generators are operated within its optimal operating space as defined by a reactive capability curve. Allocating a power demand with consideration of the reactive capability curves of the power generators results in optimal generation of real power and reactive power as specified by the load demand. Alternatively, the economic dispatch program allocates load demand specifying real power and reactive power to be delivered by a power grid among various power plants wherein one or more of the various power plants have capacity limits exhibited by reactive capability curves.

Claims

1. A method of operating a power plant having a plurality of power generators, the method comprising:

receiving a load demand specifying (1) real power to be produced by the power plant and (2) reactive power to be produced by the power plant;

determining an objective function of the power plant specifying an operating condition of the power plant as a function of (1) the real power to be produced by the power plant and (2) reactive power to be produced by the power plant; and

determining an optimal value of the objective function.

2. A method of claim 1, wherein determining the optimal value of the objective function includes ascertaining that the power plant is operated in an optimal space of a reactive capability curve of at least one of the plurality of power generators.

3. A method of claim 2, further comprising approximating the reactive capability curve using one of (1) a curve fitting technique and (2) a neural network.

4. A method of claim 3, further comprising updating the reactive capability curve based on one of (1) a periodic basis and (2) a predetermined criteria.

5. A method of claim 1, wherein determining the optimal value of the objective function comprises solving a plurality of relationships between a plurality of parameters of the power plant.

6. A method of claim 5, further comprising using an evolutionary solver for solving the plurality of relationships between the plurality of parameters of the power plant.

7. A method of claim 1, wherein the objective function specifies the cost of generating (1) the real power to be produced by the power plant and (2) reactive power to be produced by the power plant.

8. A method of claim 1, wherein the objective function specifies an emission of a first pollutant during an operation of the power plant.

9. A method of claim 1, wherein the operating condition of the power plant is one of (1) a cost and (2) an emission of a first pollutant.