Research on Comprehensive Treatment Device of Low Voltage Distribution Network Based on Improved Particle Swarm Optimization Algorithm

With the continuous access of large-scale distributed photovoltaics (PV) to low-voltage distribution networks, the three-phase imbalance problem of low-voltage distribution networks is becoming increasingly severe, and problems such as voltage over-limit are prone to occur when the PV output is excessive. To solve the above, this paper proposes a comprehensive treatment device based on the coordinated operation of small-capacity energy storage converters and reactors. By controlling each phase's active and reactive power, the voltage over-limit can be controlled, and the three-phase voltage imbalance can be alleviated. By using the improved particle swarm optimization algorithm, simulation analysis was carried out in an IEEE-20 node low-voltage distribution network, which verified the effectiveness of the proposed comprehensive treatment device in dealing with low-voltage distribution network voltage over-limit and three-phase imbalance.