Dynamic mode decomposition systems and methods to detect power quality events
| DWPI Title: Method for detecting power quality disturbance e.g. fault, from signals in power system, involves sending indication about power quality disturbance to user for taking action comprising isolating power quality disturbance location |
| Abstract: Systems and methods for new systems and methods for detecting power quality disturbances, such as faults. The approach is based on the dynamic mode decomposition (DMD)—a data-driven method to estimate linear dynamics whose eigenvalues and eigenvectors approximate those of the Koopman operator. The approach uses the real part of the main eigenvalue estimated by the DMD as the key indicator that a power quality event has occurred. The disclosed systems and methods can be used to detect events using current and voltage signals to distinguish different faults. Because the proposed method is window-based, the effect that the window size has on the performance of the approach is analyzed. |
| Use: Method for detecting a power quality disturbance e.g. fault (claimed), solar irradiance variability, load harmonics and inrush current, from signals in a power system. |
| Advantage: The method enables accurately and swiftly detecting power system signal quality events in an efficient manner. The method enables detecting PQ events to avoid system instability with faster transients and larger magnitudes. |
| Novelty: The method involves monitoring a power signal. A new data point i.e. voltage and current, is received from a monitored signal. Dynamic mode decomposition of a window of the new data point where the new data point is included in the window and the oldest data point is discarded for keeping the window size constant is computed. A real-part of eigenvalues is obtained from the dynamic mode decomposition. Values of the real-part of eigenvalues against a pre-specified threshold are compared. Existence of power quality disturbance and location is determined when a set of predetermined criteria is satisfied. Indication about power quality disturbance is sent to a user for taking an action comprising isolating the power quality disturbance location, where the set of signals is a three-phase signal and the power signal is a power transmission in an electrical grid. |
| Filed: 7/14/2022 |
| Application Number: US17864990A |
| Tech ID: SD 15527.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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