Methods for generating models of non-linear systems and components and for evaluating parameters in relation to such non-linear models

• US 5,692,158 A
• Filed: 12/09/1994
• Issued: 11/25/1997
• Est. Priority Date: 08/28/1992
• Status: Expired due to Fees

• Current Assignee: ABB Incorporated (ABB Limited)
• Original Assignee: ABB Power T&D Limited (ABB Limited)
• Inventors: Degeneff, Robert C., Gutierrez, Moises R.
• Primary Examiner(s): Teska, Kevin J.
• Assistant Examiner(s): FREJD, RUSSELL WARREN
• Application Number:
  US08/353,478
• Time in Patent Office: 1,082 Days
• Field of Search: 235/151.21, 364/494, 364/578, 395/500
• US Class Current: 703/2
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks

Abstract

A method for generating a computer model for use in system component design as well as overall system evaluation is disclosed. The method includes the steps of generating an equation model of the system component, modifying the equation model by integrating according to the trapezoidal rule, wherein an integrated model is formed having a plurality of parameter values. Certain of such parameter values define historical parameter values accounting for historical parameter information. the parameter values are arranged in matrix form and reordered. The reorder matrix equation is reduced by eliminating certain of the parameter values, thereby forming a reduced model. When the reduced model is incorporated is a system model it is necessary to modify the system model to account to the component model current parameter information. Such information is used by the component model to update the historical information.

Claims

1. A system for generating a reduced, computer-readable matrix model of a component of a system for use in analyzing said component, said component being initially represented by an equation model, comprising:

a computer; and

a computer-readable storage medium operatively coupled to said computer and containing;

(1) a first matrix model of said component, wherein said matrix model contains parameter values and is representative of said equation model;

(2) first code means for linearizing a portion of said first matrix model, thereby forming a second matrix model;

(3) second code means for reordering and reducing said second matrix model by eliminating certain of said parameter values, whereby said reduced model is formed; and

wherein both the first matrix model and the reduced model provide predictions of the performance of said component, and the accuracy of said reduced model is substantially identical to that of said first matrix model.

2. The system of claim 1, further comprising third code means contained in said storage medium for forming a series of reduced matrix models.

3. The system of claim 2, further comprising fourth code means for forming said series of reduced matrix models in a bidimensional cubic spline.

4. The system of claim 1, wherein said first matrix model comprises an inductance matrix and wherein the first code means for linearizing a portion of said first matrix model comprises means for linearizing said inductance matrix.

5. The system of claim 4, wherein said means for linearizing said inductance matrix comprises means for holding the inductance matrix constant for a given instant of time.

6. The system of claim 1, further comprising means for modifying said reduced model to account for historical information of certain parameters represented in said reduced model.