Table 3 Comparison of calculation time between FFT harmonic analysis method and digital quadrature detection method
Calculate points | Calculation time of FFT (us) | 5th-order THD calculation time of DQD(us) | 5th-order THD calculation time ratio (%) | 15th-order THD calculation time of DQD(us) | 15th-order THD calculation time reduction ratio (%) |
|---|---|---|---|---|---|
128 | 1977.6 | 530.72 | 73.16 | 1602.56 | 18.96 |
256 | 3971.1 | 885.94 | 77.69 | 2664.26 | 32.91 |
512 | 8088 | 1605.02 | 80.16 | 4780.09 | 40.90 |
1024 | 16,226 | 3055.56 | 81.17 | 9039.5 | 44.29 |