A novel method to trace flicker sources

Voltage flicker is a common phenomenon of power quality problems which is referred to as voltage low frequency fluctuations modulated on carrier signal. Voltage flicker creates some variations in network voltage. In order to mitigate flicker, the flicker source should be identified. This paper proposes a novel method to determine the direction of flicker flow by using flicker power measurement. At first, low frequency fluctuations are separated from monitored signals by using coherent phase demodulation and wavelet transform. Then the flicker power is computed via voltage and current envelopes. The direction of flicker flow in network is obtained from the sign of the flicker power. The proposed algorithm has been validated by simulations.