Inverter controlled equipment stops when detecting a fault in the commercial power supply.
The following items should be measured simultaneously:
- Voltage fluctuation – The output voltage fluctuates regardless of the demand caused by the wind speed difference.
- Frequency fluctuation
- Transient overvoltage, Waveform distortion – Generated by lightning strikes and grid switching
- Inrush current
- High-order harmonics
Source : Guidebook for Power Quality Measurement, HIOKI E.E. Corporation