Harmonic degradation analysis method for parameter-unknown grid-connected inverter based on impedance fitting
An analysis method and inverter technology, applied in complex mathematical operations, design optimization/simulation, special data processing applications, etc., can solve problems such as there is no very effective method, reduce the number of iterations, and meet fast and accurate impedance modeling The effect of shortening the time-consuming calculation
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[0080] Based on RT-LAB, a semi-physical real-time simulation platform was built, and the following experiments were carried out: Example 1: The power grid is in a state of no background harmonics, and the grid-connected current waveform of the inverter at the PCC point is observed, as shown in Figure 5(a); Carry out FFT decomposition, and draw the frequency spectrum as shown in Fig. 5(b). Embodiment 2: There are 14 background harmonics in the grid voltage, and the harmonic amplitude is 5% of the rated voltage. Observe the grid-connected current waveform of the inverter at the PCC point, as shown in Figure 5(c); perform FFT on it Decompose and draw the spectrogram as shown in Figure 5(d).
[0081] When there is no background harmonic in the power grid, it can be seen from Figure 5(a): the grid-connected inverter grid-connected current waveform has no obvious distortion; it can be seen from Figure 5(b) that the grid-connected inverter will Inject wide-frequency domain harmonic ...
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