A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High-Precision Power Analyzers

Table 1

Voltage measurement comparison.

AC voltage (V) signal frequency 100 Hz
Standard value	The old method			The proposed method
	Phase A	Phase B	Phase C	Phase A	Phase B	Phase C
30.00	30.01	29.98	29.97	30.00	29.96	29.95
60.00	59.96	59.98	60.02	60.05	59.98	59.94
100.00	100.02	100.04	100.01	100.08	99.96	99.96
220.00	220.11	220.13	220.05	220.16	219.92	219.90
380.00	379.90	380.28	379.86	380.24	379.88	379.85
500.00	500.04	499.77	499.85	500.31	500.47	499.97
660.00	660.39	660.56	659.67	660.67	659.64	659.78
800.00	801.18	801.28	800.79	800.85	800.83	799.69
950.00	950.95	951.58	950.62	951.52	949.50	948.89