Method and system for monitoring harmonic waves of power grid of dredge boat

Abstract

The embodiment of the invention discloses a method for monitoring harmonic waves of a power grid of a dredge boat. The method comprises the steps of obtaining original power signals in the power grid, extracting measurement quantity of the harmonic waves of the original power signals in the power grid each time, calculating the optimal estimation value (please see the formula in the specification) of the amplitude of the hth harmonic wave at the moment k according to measurement quantity (please see the formula in the specification) of the hth harmonic wave at the moment k, calculating a covariance matrix (please see the formula in the specification) of the optimal estimation value (please see the formula in the specification), according to the optimal estimation value (please see the formula in the specification), calculating the harmonic distortion rate (THD) k at the moment k, and according to the harmonic distortion rate of each time, judging the quality of the power signals of the power grid. According to the embodiment, on the basis of the conventional Kalman filtering algorithm, a correction factor gamma is introduced to express dredging operation environment, a robust Kalman filtering algorithm on the basis of a fuzzy self-adaptation optimizing reasoning model is built, one-step prediction and estimation of the harmonic data of the power grid are completed, robustness of a power grid harmonic monitoring system is obviously improved, the optimal estimation value of the harmonic distortion rate is made to be closer to the original power signals, finally, the quality of the power grid is judged according to the harmonic distortion rate, and the accuracy of judgment is improved.

Description

technical field [0001] The invention relates to the technical field of power grid quality monitoring, in particular to a dredger power grid harmonic monitoring method and system. Background technique [0002] After decades of development, my country has basically possessed the comprehensive ability of research and development, design and manufacture, and supporting maintenance of dredgers. Since the 1960s, my country has successively developed various dredgers such as cutter suction, drag suction, grab bucket, bucket, and cutter wheel, basically covering all types of dredgers in the world. At the same time, my country also possessed power equipment, dredging equipment, hydraulic machinery and other supporting equipment for the production and manufacture of dredgers, and entered the international market. In the dredging industry, the cutter suction dredger is a ship widely used in dredging projects at present. [0003] The cutter suction dredger is mainly composed of a mud ...

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Problems solved by technology

[0063] The purpose of the present invention is to solve the problem that the accuracy of the conventional Kalman filter algorithm decreases due to sparse noise under special working conditions and sea conditions. Based on a robust Kalman filter algorithm, a dredger power grid harmonic monitoring method and system are proposed to complete the power grid The one-step prediction and estimation of harmonic data can significantly improve the robustness and monitoring accuracy of the grid harmonic monitoring system

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