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US 10,095,247 B2Granted
System and method for controlling oscillatory instabilities in a device
AssigneeIndian Institute of Technology Madras
InventorsVishnu Rajasekharan Unni, Vineeth Nair Vinod, Sujith Raman Pillai Indusekharan Nair, Achintya Mukhopadhyay
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Abstract
A method for detecting onset of oscillatory instability in a device is described. The method includes obtaining a symbolic time series of a time series signal corresponding to a dynamic state variable of the device. The method further includes detecting the onset of oscillatory instability in the device based on the symbolic time series.
Claims13
A method for detecting an onset of oscillatory instability in a device, the method comprising:
- performing analysis of a time series signal to detect onset of oscillatory instability, wherein said analysis is performed by considering that at said onset of oscillatory instability said time series signal exhibits specific patterns captured in a corresponding time window of said time series signal;
- generating a symbolic time series from said time series signal corresponding to a dynamic state variable of said device;
- identifying presence of oscillatory instability in said time series signal corresponding to said dynamic state variable by recognizing a change in said patterns;
- constructing a Probabilistic Finite State Automata (PFSA) from said symbolic time series, wherein said PFSA is associated with a current state of said dynamic state variable;
- computing an anomaly measure based on said PFSA and a PFSA corresponding to a reference state, wherein said anomaly measure indicates proximity of said PFSA to that of a reference PFSA, wherein said current state corresponds to a state for which said anomaly measure is being measured and a reference state is selected based on a dynamic state corresponding to said onset of oscillatory instability;
- detecting said onset of oscillatory instability in response to determining that said anomaly measure is below an anomaly threshold;
- and
- varying at least one parameter of said device in accordance to said detected onset of oscillatory instability to control an oscillatory instability.
5 more elements
A system for detecting onset of oscillatory instability in a device, the system comprising:
- an instability detection unit configured to:
- perform analysis of a time series signal to detect onset of oscillatory instability, wherein said analysis is performed by considering that at said onset of oscillatory instability said time series signal exhibits specific patterns captured in a corresponding time window of said time series signal;
- generate a symbolic time series from said time series signal corresponding to a dynamic state variable of said device;
- identify presence of oscillatory instability in said time series signal corresponding to said dynamic state variable by recognizing a change in said patterns;
- construct a Probabilistic Finite State Automata (PFSA) from said symbolic time series, wherein said PFSA is associated with a current state of said dynamic state variable;
- compute an anomaly measure based on said PFSA and a PFSA corresponding to a reference state, wherein said anomaly measure indicates proximity of said PFSA to that of a reference PFSA, wherein said current state corresponds to a state for which said anomaly measure is being measured and a reference state is selected based on a dynamic state corresponding to said onset of oscillatory instability;
- detect said onset of oscillatory instability in response to determining that said anomaly measure is below an anomaly threshold;
- and
- vary at least one parameter of said device in accordance to said detected onset of oscillatory instability to control an oscillatory instability.
6 more elements
Dependencies are inferred from the claim text.