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Energy Financial Settlements
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Patent US10110976
Issued 2018-10-23
Systems And Methods For System Measurements Integrity Determination
Systems and methods of the present disclosure are directed to determining the integrity of system measurements. The system and methods of the present disclosure can detect corrupted process measurement signals that can originate in instrumentation used with electricity distribution and transmission systems. These process measurement signals may be delivered by digital communications networks.
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- 1. A method of detecting signal deviations in a utility grid, comprising:
receiving a first sampled time series of a first signal of a first process or a first operational characteristic of electricity in the utility grid, the first sampled time series of the first signal measured by a first digital device connected to the utility grid; receiving a second sampled time series of a second signal of a second process or a second operational characteristic of electricity in the utility grid, the second sampled time series of the second signal measured by a second digital device connected to the utility grid; identifying a pair of signals formed from the first sampled time series of the first signal and the second sampled time series of the second signal responsive to identifying a physical co-dependence between the first signal and the second signal, the physical co-dependence between the first signal and the second signal identified based on at least one of a dependence as indicated by one or more physical factors between the first digital device and the second digital device or a common phase between the first signal and the second signal, wherein the one or more physical factors includes at least one of connectivity between the first digital device and the second digital device or a connection topology of an electric circuit of the utility grid; selecting, based on the pair of signals identified based on the physical co-dependence, an estimator from a predetermined list of estimators configured for the pair of signals; determining, based on the estimator configured for the pair of signals identified based on the physical co-dependence, a metric for the pair of signals; comparing the metric for the pair of signals with a nominal metric for the estimator configured for the pair of signals; detecting, responsive to the comparison, a deviation between the metric for the pair of signals and the nominal metric for the estimator, the detected deviation due to at least one corrupt signal; and responsive to detecting the deviation, generating an alert that indicates the deviation and at least one of the first digital device or the second digital device connected to the utility grid that provided the at least one of the first sampled time series or the second sampled time series that form the pair of signals that deviate from the nominal metric due to the at least one corrupt signal.
- 12. A system for detection of signal deviations in a utility grid, comprising:
a non-conforming signal detector comprising one or more processors that execute a metric estimator component to: receive a first sampled time series of a first signal of a first process or a first operational characteristic of electricity in the utility grid, the first sampled time series of the first signal measured by a first digital device connected to the utility grid; receive a second sampled time series of a second signal of a second process or a second operational characteristic of electricity in the utility grid, the second sampled time series of the second signal measured by a second digital device connected to the utility grid; identify a pair of signals formed from the first sampled time series of the first signal and the second sampled time series of the second signal responsive to identifying a physical co-dependence between the first signal and the second signal, the physical co-dependence between the first signal and the second signal identified based on at least one of a dependence as indicated by one or more physical factors between the first digital device and the second digital device or a common phase between the first signal and the second signal, wherein the one or more physical factors includes at least one of connectivity between the first digital device and the second digital device or a connection topology of an electric circuit of the utility grid; select, based on the pair of signals identified based on the physical co-dependence, an estimator from a predetermined list of estimators configured for the pair of signals; determine, based on the estimator configured for the pair of signals identified based on the physical co-dependence, a metric for the pair of signals; compare the metric for the pair of signals with a nominal metric for the estimator configured for the pair of signals; detect, responsive to the comparison, a deviation between the metric for the pair of signals and the nominal metric for the estimator, the detected deviation due to at least one corrupt signal; and responsive to detection of the deviation, generate an alert that indicates the deviation and at least one of the first digital device or the second digital device connected to the utility grid that provided the at least one of the first sampled time series or the second sampled time series that form the pair of signals that deviate from the nominal metric due to the at least one corrupt signal.
