Wavelet packet extraction method for grid-connected inverter network-side harmonic current information
A technology of resonant current and extraction method, which is applied in the direction of measuring current/voltage, instruments, measuring electric variables, etc., can solve the problem of endangering the operation safety of grid-connected inverters and power grids, the aggravation of grid-connected branches and PCC current resonance, and digital processing It solves problems such as large resource consumption of the device, and achieves the effects of fast computing speed, low resource consumption, and strong engineering practicability
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[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0028] Such as figure 1 As shown, a wavelet packet extraction method for grid-side resonant current information of grid-connected inverters includes the following steps:
[0029] (1) Detect wavelet decomposition layers: detect the wavelet decomposition layers j of the current wavelet band, and judge whether the current wavelet decomposition has reached the set maximum decomposition layers (the highest decomposition layers in this embodiment is 4), if judge If the current wavelet decomposition does not reach the set maximum number of decomposition layers, then enter step (2), otherwise, stop the decomposition, and mark the lowest frequency band as the zero frequency band;
[0030] (2) Wavelet decomposition coefficients for the upper layer (j-1 layer) After wavelet transform, the wavelet decomposition coefficient of the current layer...
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