Research on Variable-Frequency Harmonic Estimation Algorithm of Pulse Power Supply System

The tokamak pulse power supply system has a large amount of impulse reactive power and harmonics, which can occupy a large amount of pulse generator's limited capacity. The characteristics of pulse generator lead to a significant variation in the pulse signal frequency, with the fundamental harmonic varying over a range of up to 30 Hz or even more. In this paper, an improved algorithm based on the continuous wavelet transform (CWT) is proposed, which can be used to perform an effective time-frequency analysis of variable-frequency harmonics in the pulse power supply system. The harmonic results are calculated by simulating the variable-frequency distorted voltage and current waveforms from the pulse generator. Comparison with the theoretical values, the results show that the proposed multi-scale feature integration continuous wavelet algorithm(MSFI-CWT) can effectively analyze the variable-frequency distortion voltage and current signals. The MSFI-CWT proposed can be used as a reference for the reactive power and harmonic analysis of tokamak pulse power supply system.