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Estimation of real-time power system quanities using time-synchronized measurements

A power system, phasor measurement technology, applied in the field of phasor measurement, can solve the problems of time-consuming and complex, system loss, etc.

Active Publication Date: 2013-10-30
HITACHI ENERGY SWITZERLAND AG
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  • Application Information

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Problems solved by technology

Unfortunately, however, such an arrangement makes the system susceptible to loss of the signal provided by the reference PMU, for example due to interruption at the measurement location, failure of the reference PMU, or communication failure
While it is possible to compensate for such losses, the process for doing so is relatively time consuming and complex

Method used

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  • Estimation of real-time power system quanities using time-synchronized measurements
  • Estimation of real-time power system quanities using time-synchronized measurements
  • Estimation of real-time power system quanities using time-synchronized measurements

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Embodiment Construction

[0019] Time signals measured in power system networks are sinusoidal in their ideal form, and for example the voltage at a particular node as a function of time would ideally have the following form:

[0020] Equation 1

[0021] v i ( t ) = 2 V i cos ( 2 π f sys t + θ i )

[0022] where i is the node, t is the time, v i (t) is the voltage over time, V i is the root mean square (RMS) magnitude of the voltage, f sys is the system frequency, θ i is the phase angle. Phasor calculus is used to simplify power system analysis. Gather the voltage signal v i The RMS magnitude and phase angle of (t) to form the phasor The phasor is a complex numbe...

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Abstract

Phasor measurement units (108) provide phasor data from various locations (102) in an electrical power system. The phasor data is referenced to a common timing signal. Non-phasor measurement data is also obtained at various locations in the power system. A phasor assisted state estimator (120) uses the phasor data and the non-phasor data to determine the power system state.

Description

technical field [0001] The present invention relates to the use of phasor measurements in power system state estimation. The invention has particular application in synthesizing voltage and current phasors during state estimation. Background technique [0002] Power system status information plays an important role in the operation and analysis of power systems. In fact, state information can be used for many purposes, including system safety and accident analysis, system optimization, and even the creation and operation of electric energy markets. [0003] Traditionally, state estimators have used non-phasor measurements such as power flow and voltage and current magnitudes for indirect estimation of power system state (i.e., voltage magnitudes and angles at network buses, tap positions of tap-changing transformers Wait). Recently, however, phasor measurement units (PMUs) have been developed. PMUs provide time-stamped measurements of voltage and current phasors at vario...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J13/00
CPCG01R29/18Y02E60/728Y04S20/40Y04S10/265G01R25/00Y02B90/245G01R19/2513Y02E60/00Y04S10/00Y04S10/22Y02E40/70G01D2204/14Y02B90/20Y04S20/30
Inventor E·肖尔茨R·F·纳奎J·D·芬尼M·拉森M·萨布拉玛尼安G·琳
Owner HITACHI ENERGY SWITZERLAND AG
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