Hierarchical Localization Method of Broadband Oscillation Disturbance Source Based on Compressive Sensing and ISTA

Under the development trend of high proportion of renewable energy and power electronic equipment, the problem of broadband oscillation is becoming more and more prominent. The interaction between power electronic equipment and power grid is strongly time-varying and nonlinear, which makes it difficult to accurately locate the source of oscillation disturbance. This paper proposes a hierarchical localization method of oscillatory disturbance sources in wide-area systems based on compressed sensing and iterative shrinkage-thresholding algorithm (ISTA). Firstly, the Shapelet algorithm is used to construct the positioning initiation criterion with the timing signal as the input, and the measurement-matrix synchronous-compression oscillation signal is generated. Then, the master station locates the disturbance area based on the oscillation compression signal according to the result of the criterion. Finally, the ISTA network is used to restore the original oscillatory signal to achieve precise positioning of the oscillatory source. The proposed method is applied for the location task of disturbance source of a four-machine two-area system with wind farms. The results show that the proposed method can break through the limitation of the Nyquist sampling theorem and achieve high-accuracy disturbance source location under the condition of low computational requirements. © 2024 Science Press. All rights reserved.