Method and System for Detecting Unbalance in Power Grids
OwnerZafer Sahinoglu, Ming Sun +1inventors
InventorsZafer Sahinoglu, Ming Sun, Koon Hoo Teo
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Abstract
A method for detecting unbalance in a 3-phase voltage signal includes sampling the signal over an observation widow to determine a set of observations, and detecting the unbalance of the signal based on a probability density function (pdf) of the set of observations.
Claims17
A method for detecting unbalance in signal, wherein the signal is 3-phase voltage signal of a power grid, the method comprising:
- sampling the signal over an observation window to determine a set of observations;
- and
- detecting the unbalance of the signal based on a probability density function (pdf) of the set of observations.
An unbalance detector, comprising:
- an input terminal for acquiring a signal, wherein the signal is a 3-phase voltage;
- a statistical model computation module for determining a joint pdf of a set of observations of the signal;
- a processing unit for determining ratio of the joint pdf of the set of observations and a joint pdf of the signal without unbalance;
- a comparison module for comparing the ratio with a threshold to determine an unbalance of the signal;
- and
- an output terminal for signaling the unbalance of the signal.
A method for detecting unbalance in a signal, wherein the signal is 3-phase voltage, the method comprising:
- determining a statistical value using a general likelihood ratio test based on a set of samples of the signal and a frequency of the signal;
- and
- comparing the statistical value with a threshold to determine an unbalance of the signal, wherein the steps are performed by a processor.
The method of claim 16, further comprising:
- determining the threshold based on a probability of a false alarm.
The method of claim 17, wherein the probability of the false alarm includes a probability of detecting unbalance in a balanced signal.
Dependencies are inferred from the claim text.