Method and system for measuring broadband signal of power grid
By using four-item fifth-order Nuttall second-order self-convolution windows to window the broadband signal of the power grid and perform spectral line interpolation calculations, the problem of spectrum leakage in traditional measurement methods is solved, and the refined measurement of the broadband signal of the power grid is realized. and high accuracy results.
CN119492912APending Publication Date: 2025-02-21NARI NANJING CONTROL SYSTEM CO LTD
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Patent Information
- Application Number
- CN202411491760.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-02-21
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Figure CN119492912A_ABST
Abstract
The invention discloses a method and a system for measuring broadband signals of a power grid. The method comprises the following steps of: windowing the broadband signals of the power grid by using a four-item five-order Nuttall self-convolution window; acquiring a frequency domain signal of the windowed power grid broadband signal by using an FFT (Fast Fourier Transform) algorithm, and acquiring four spectral lines near a target frequency point; performing spectral line interpolation calculation on the windowed power grid broadband signal by using the four spectral lines, and correcting the frequency, the amplitude and the phase; and calculating the amplitude, the frequency and the initial phase angle of each harmonic wave of the broadband signal of the power grid according to the corrected frequency, amplitude and phase model. According to the invention, the broadband signal of the power grid can be accurately measured, so that the frequency, amplitude and phase of the measurement result can accurately reflect the physical characteristics of the signal.
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