Abstract: The loop power flow control of the low-voltage distribution network can reduce the network operation risk and ensure the safety of the network operation. For this reason, a closed loop power flow control method for low-voltage distribution networks under three-phase unbalanced conditions is proposed. This method is based on the structural characteristics of the low-voltage distribution network, calculates the loop power flow of the power grid, and determines that the voltage amplitude difference and the phase angle difference are the main influencing factors. On this basis, the power flow controller is used to construct a closed-loop power flow control model, and the voltage compensation and the balance of the bus voltage are realized through the series part and the related part. In this way, the amplitude difference and the phase angle difference of the voltage difference are adjusted, the loop closing current is reduced, and the loop closing power flow control is realized. The test results show that the voltage difference is significantly reduced after the method is controlled, and the effective current values are all above 0.4. The power output at both ends of the line is in a balanced state, and the phase angle is greatly reduced, so that the loop power flow can be effectively controlled.