Within the «Kundalini Yoga System» there is a Sub-Yoga called «Swara Yoga». And «Swara» means energy flow, so «Swara Yoga» is the Yoga of energy flow. And «Swara Yoga» describes in particular just the «Nadis» and the Chakras.
Sukadev explains the background of Swara Yoga, with the knowledge of which you can consciously control Prana in the Nadis and this supports you in your practice of Alternate Breathing or Anuloma Viloma.