As same as AC distribution system

the DC voltage and DC current characterizing feature of DC distribution system is changing instantaneously in random in terms of fluctuation magnitude and frequency

making variation of illuminance of lights connected to DC network

leading to human being impression of unsteadiness of visual sensation induced by a light stimulus

namely flicker. Comparing with the recognized and standardized flicker measurement method of AC distribution system

the flicker measurement method for DC distribution system is still under development and discussion. In this paper

a new method called non-squaring-demodulation method applicable for DC distribution system is proposed on the basis of the feature of DC distribution system and the traditional squaring-demodulation flicker measurement method defined in AC distribution system. The simulation analysis shows that the method is high in accuracy

the error within the wide flicker variation range is within the acceptable range

which is greatly superior to traditional square demodulation method.