In the paper, a digital demodulator based on the recursivegauss-newton method is proposed for Electrical Tomography. The digital demodulator can track the amplitude and phase of a noisy sinusoidal signal with known f...
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ISBN:
(纸本)9781479952205
In the paper, a digital demodulator based on the recursivegauss-newton method is proposed for Electrical Tomography. The digital demodulator can track the amplitude and phase of a noisy sinusoidal signal with known frequency directly. Compared with the traditional digital multiplication demodulation method, the proposed demodulator is more flexible. It is implemented in a recursive way and only part of a full period is required for demodulation. Therefore, the trade-off between the speed and precision can be made by using the proposed demodulator. The proposed demodulator was implemented in the software and possessed low computational complexity. Numerical simulation was carried out to prove its feasibility. The parameters in the demodulator were optimized.
This study presents a new recursivegauss-newton method-based adaptive filter for estimating the time-varying amplitude, phase, and frequency of fundamental and harmonic components of power system voltage or current c...
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This study presents a new recursivegauss-newton method-based adaptive filter for estimating the time-varying amplitude, phase, and frequency of fundamental and harmonic components of power system voltage or current corrupted by noise. The coefficients of the adaptive filter are obtained from unconstrained optimisation of an error function weighted by a variable forgetting factor, and using suitable approximation of the recursive gauss-newton algorithm for reducing computational complexity. To improve the tracking speed and accuracy of the filter, the forgetting factor is tuned iteratively. This approach is very much suitable for a large variety of applications in the distributed generation control and protection, synchronised phasor measurement of voltage and current signals using phasor measurement units, power electronic converters etc. Several computational issues like the time-varying nature of the power system voltage and frequency parameters, noise and distortion, presence of decaying dc and inter-harmonics are considered to evaluate the fast operation and robustness of the proposed approach.
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