Detection and evaluation method of power quality disturbance in hybrid power system based on vmd initialization s-transform

Abstract

Hybrid power system power quality disturbance detection and evaluation technology based on VMD initialization S-transform, including: based on variational mode decomposition (VMD) initialization S-transform technology for different characteristics of DG types and operating events connected to the distribution network. PQ perturbation is detected, classified and identified. A hybrid power system based on wind power generation and photovoltaic power generation IEEE‑13 nodes is built as a test platform to verify the effectiveness of the proposed algorithm. First, the F1 and F2 feature quantities are extracted from the PQ disturbance signal as the criteria for the classification of distributed energy resources connected to the hybrid power system. Secondly, the S transformation is initialized by VMD, and the F3-F7 feature quantity is extracted from the S transformation matrix as the input of the FCM clustering algorithm, and the PQ disturbance caused by the change of the operation event under each distributed energy access condition is classified. The percentage accuracy comparison between the proposed method and the existing method verifies the effectiveness of the proposed algorithm; finally, a power quality evaluation index is proposed, and the power quality influencing factors of 9 types of disturbances are evaluated under this index .

Description

technical field [0001] The invention belongs to the technical field of detection and classification of power quality disturbance signals, and in particular relates to a hybrid power system power quality disturbance detection and evaluation method based on VMD initialization S transformation. Background technique [0002] At present, power quality monitoring has become an important part of protecting electrical and electronic equipment and identifying the cause of interference. Traditionally, power quality refers to the availability of power, voltage, and frequency regulation within a specified range. As the goal of sustainable development continues to deepen in the grid, more and more renewable energy and distributed generation are integrated in the distribution grid. Due to its randomness and intermittent characteristics, the power quality disturbance signal generated when a large number of integrations have certain characteristics. They use power electronic equipment as ...

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Problems solved by technology

If the PQ disturbance cannot be detected in time and the disturbance index is reduced, it may lead to interruption of power transmission and distribution network, equipment damage or efficiency reduction, which will cause huge economic losses

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