Data Analysis and Conclusion

Data Analysis and Conclusion of Active Power Filter

1. Data Analysis

THD of Current

Before: THDi=86.8%, 87.4%, 88.5%
After: THDi=6.3%, 6.2%, 6%, drop 92%

Harmonic Current

Before:
I5=30.2A; 29.5A; 28.7A
I7=19.8A; 20.3A; 19.4A
I11=3.5A; 3.1A; 3.5A

After:
I5=1.8A; 2A; 1.7A; drop 93%
I7=2.2A;2.1A;2.1A; drop89%
I11=1.3A; 1.3A; 1.4A; drop 60%

2. Conclusion

The measured data indicate that the power quality is improved after installation of active power filter; harmonic filtering rate is over 90%.

Waveform Comparison

System Voltage

System Current

Voltage Distortion Rate

Current Distortion Rate