With the development of distribution network, the three-phase unbalance caused by increasingly complex loads affects the safety and economic operation of the power grid. For solving three-phase unbalanced problem, the power supply mode of the distribution network based on the three-phase to single-phase ac/dc/ac converter is proposed in this paper. A control method of a three-phase to single-phase ac/dc/ac converter is given, this power supply mode is evaluated from the aspects of equipment reliability, investment and construction cost, operation and maintenance cost and power quality. A distribution network power supply module based on three-phase to single-phase ac/dc/ac converter is implemented in PSCAD/EMTDC. The simulation results show that the proposed power supply method is feasible and has good reference for the planning and construction of distribution network.

distruibution network,power supply mode,power quality,three phase unbalance,AC/DC/AC converter