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Apparatus and method for estimating synchronized phasors at predetermined times referenced to a common time standard in an electrical system

a technology of synchronized phasors and apparatus, applied in the direction of electrical measurements, measurement devices, instruments, etc., can solve the problem of time delay introduced in the state-estimation algorithm

Inactive Publication Date: 2008-11-13
ZWEIGLE GREGARY C +2
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  • Abstract
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  • Application Information

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Benefits of technology

"The invention is an apparatus and method for estimating synchronized phasors in an electrical power system. The apparatus includes a sample controller, a sampling means, a time controller, and a phasor estimator. The method involves acquiring a power system signal, determining the frequency of the signal, sampling the signal at a sampling interval rate, and generating acquisition time values based on the occurrence of signal samples. Each acquisition time value is associated with a phasor magnitude and a phasor phase angle. The method also includes adjusting the phasor magnitude and phase angle based on the time difference between the acquisition time value and a predetermined time. The invention can be used in both local and remote power systems and can be used for various applications such as power system analysis and control."

Problems solved by technology

One inherent limitation of state-estimation algorithms however is the time delay introduced as a result of the estimation of the power system state.

Method used

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  • Apparatus and method for estimating synchronized phasors at predetermined times referenced to a common time standard in an electrical system
  • Apparatus and method for estimating synchronized phasors at predetermined times referenced to a common time standard in an electrical system
  • Apparatus and method for estimating synchronized phasors at predetermined times referenced to a common time standard in an electrical system

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Embodiment Construction

[0029]In contrast to existing systems, the present invention provides a calculation of synchronized phasors at predetermined times referenced to an absolute time standard, in a manner that eliminates the need for further time alignment, and allowing correlation to all synchronized phasors in the system, even when they are acquired from multiple electric power system locations with varying states and differing frequencies. The sampling interval rate is variable, based on the varying frequency of the local power system signal and can furthermore be based on an exact multiple of the frequency of the local power system signal. No corrections for frequency deviations are required. It provides synchronized phasors which are further processed for power system protection applications requiring sampling intervals also based on a multiple of the local power system frequency. It does not require sampling to be synchronized or based on the same frequency between measuring devices (e.g. IEDs) wh...

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Abstract

An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the absolute time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to an absolute time standard to form the plurality of synchronized phasors.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation application of co-pending U.S. patent application Ser. No. 11 / 504,788 filed on Aug. 15, 2006 and entitled “Apparatus and Method for Estimating Synchronized Phasors at Predetermined Times Referenced to an Absolute Time Standard in an Electrical System, which claims benefit under 35 U.S.C. §119(e) of U.S. Provisional Application entitled “Method of Phasor Estimation at Predetermined Time Instants”, filed on Oct. 18, 2005, having Ser. No. 60 / 727,764, naming Gregary C. Zweigle, Armando Guzman-Casillas, and Luther Scott Anderson as inventors, the complete disclosure thereof being incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to monitoring, metering, protection and control of electrical systems, and more specifically, to an apparatus and method for estimating synchronized phasors at predetermined times referenced to an absolute time standard in an electrical...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01R13/00
CPCG01R19/2513Y02E60/728Y04S10/265Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor ZWEIGLE, GREGARY C.ANDERSON, LUTHER S.GUZMAN-CASILLAS, ARMANDO
Owner ZWEIGLE GREGARY C
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