Method and system for evaluating harmonic emission level of new energy station based on recording data

By performing wavelet threshold denoising and Fourier analysis on the wave recording data of new energy stations, users of abnormal buses and suspicious harmonic source are screened, equivalent models are established and harmonic transfer impedance are solved, and problems of inaccurate harmonic evaluation and inaccurate traceability are achieved, more accurate harmonic evaluation and more efficient harmonic governance are achieved.

CN119695880APending Publication Date: 2025-03-25STATE GRID LIAONING ELECTRIC POWER CO LTD +2
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Patent Information

Application Number
CN202411849715.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The harmonic emission level evaluation of new energy stations in the prior art is inaccurate, difficult to accurately reflect the actual operating conditions, and the traceability is inaccurate.

Method used

Using a method based on wave recording data, wavelet threshold denoising processing and Fourier analysis of the recorded data of line current and bus voltage in the power grid, the amplitude and phase angle of each harmonic current and voltage are obtained, the number of harmonic times to be analyzed is determined, the abnormal bus and suspicious harmonic source users are screened, the equivalent model is established, the harmonic transfer impedance is solved, and the harmonic responsibility of each suspected harmonic source user to pay attention to the bus is quantified.

Benefits of technology

A more accurate assessment of harmonic emission level of new energy stations has been achieved, the scope of harmonic traceability has been narrowed, the working efficiency has been improved, the pertinence and effectiveness of harmonic governance has been improved, and a scientific basis for harmonic management of new energy stations has been provided.

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Abstract

The invention discloses a new energy station harmonic emission level evaluation method and system based on recording data, and the method comprises the steps: carrying out the wavelet threshold de-noising processing of the recording data of line current and bus voltage in a power grid, and then carrying out the Fourier analysis, and obtaining the amplitude and phase angle of each harmonic current and voltage; on the basis of the amplitude and phase angle of each harmonic current and voltage, the harmonic order to be analyzed is determined through the harmonic voltage content rate and the harmonic distortion rate, an abnormal bus is screened as a concerned bus, and suspicious harmonic source users in the power grid are identified; establishing an equivalent model of the power grid, and solving harmonic transfer impedance between each suspicious harmonic source user and the concerned bus in the equivalent model by using a blind source separation algorithm; and quantifying the harmonic responsibility of each suspicious harmonic source user to the concerned bus. According to the invention, the accuracy of harmonic evaluation and the accuracy of tracing are improved, and the improvement of the electric energy quality of a new energy station and the stable operation of a power grid are facilitated.
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