Method For Controlling the Electrical Energy Quality in an Electrical Power Supply System

• US 20080140327A1
• Filed: 09/20/2005
• Published: 06/12/2008
• Est. Priority Date: 10/13/2004
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Unterweger, Manfred, Anklam, Uwe
• Application Number:
  US11/665,314
• Publication Number:
  US 20080140327A1
• Time in Patent Office: Days
• US Class Current: 702/60
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
• CPC Class Codes: H02J 3/00 Circuit arrangements for ac mains or ac distribution networks
• CPC Class Codes: H02J 3/003 Load forecast, e.g. methods or systems for forecasting future load demand
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics
• 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

Abstract

A method for controlling the quality of the electrical energy of an electrical power supply system, which allows the quality of the electrical energy to be controlled so as to correspond largely to the required threshold values. The method comprises the following steps: a first test curve of measured values of a parameter which indicates the quality of the electrical energy of the power supply system is detected during a first observation period; a first pattern recognition is performed regarding the first test curve in order to generate a user profile which indicates expected time-related deviations of the parameter from a predefined setpoint range for at least one future observation period based of patterns recognized in the first test curve; and measures that stabilize the quality of the electrical energy are taken for the times of the future observation period during which a deviation of the parameter from the setpoint range is expected to occur according to the user profile.

Claims

1-7. -7. (canceled)

8. A method of controlling a quality of an electrical energy in an electrical power supply system, which comprises the following steps:

recording, during a first observation time period, a first measurement profile of a measured values of a characteristic variable indicating the quality of the electrical energy in the power supply system;

carrying out a pattern recognition process on the first measurement profile, resulting in a load profile which, on the basis of patterns recognized in the first measurement profile, indicates time-related discrepancies expected for at least one future observation time period in the characteristic variable from a predetermined nominal range; and

taking measures to stabilize the quality of the electrical energy for those times in the future observation time period in which a discrepancy between the characteristic variable and the nominal range is expected based on a load profile.

9. The method according to claim 8, which further comprises the following steps:

recording, during at least one further observation time period following the first observation time period, at least one further measurement profile of the measured values of the characteristic variable indicating the quality of the electrical energy of the power supply system;

attaching the at least one further measurement profile to the first measurement profile, resulting in a correspondingly longer combined measurement profile; and

carrying out the pattern recognition process on the combined measurement profile, resulting in the load profile.

10. The method according to claim 8, which comprises recording the measured values of the characteristic variable during an observation time period substantially having a duration selected from the group consisting of one day, one week, one month, and one year.

11. The method according to claim 9, which comprises examining the measurement profile or the combined measurement profile for periodicities during the pattern recognition process.

12. The method according to claim 9, which comprises subjecting the measurement profile or the combined measurement profile to autocorrelation during the pattern recognition process.

13. The method according to claim 8, which comprises examining the measurement profile for periodicities during the pattern recognition process.

14. The method according to claim 8, which comprises subjecting the measurement profile to autocorrelation during the pattern recognition process.

15. The method according to claim 8, wherein the pattern recognition process accesses an electronic calendar, and the pattern recognition process correlates the electronic calendar with the measurement profile or the combined measurement profile.

16. The method according to claim 8, which comprises recording measurement profiles of the characteristic variable simultaneously at a plurality of points in the power supply system, and determining the load profile on a basis of the measurement profiles recorded at a plurality of points.