In this paper, we extend proportional fair scheduling to a wireless powered communication network (WPCN) consisting of a base station (BS) and K rechargeable energy harvesting users (EHUs) that utilize dynamic time-division multiple access (D-TDMA). Each TDMA frame consists of an energy harvesting (EH) phase, which contains the RF energy broadcast by the BS, and an information transmission (IT) phase of the scheduled EHU over the uplink. We propose scheduling policy that achieves proportional fairness among the EHUs, while optimizing the BS transmit power and EH phase duration. Our numerical results reveal that such scheduling policy achieves near perfect fairness in the considered network.