Optimization of AC power measurements for immunity to spectral leakage due to imperfect phase-locking

摘要

Power measurements can benefit from spectral analysis. It may, however, also lead to errors that are not immediately recognizable, caused by spectral leakage due to imperfect phaselocking in measurement systems. This paper analyses this problem for low-frequency ac power measurements. The conclusion is that if any spectral decomposition is made, care should be taken not to use excessive measurement times, and that the phase-locked loop bandwidth should be kept as low as possible.