Improve a Voltage Unbalance Index of Bipolar DC Distribution Grid By using Particle Swarm Optimization Based on Load Balancing Method

This paper presents a bipolar DC distribution grid power flow model and load balancing method by using particle swarm optimization (PSO) to reduce power loss due to neutral current and voltage unbalance factor (VUF) due to unbalance load at each bus. The objective function leads to reducing neutral current by transferring load at each bus to balance a load at each pole by considering the various condition. The results lead to conclude that the load balancing method can be reduced neutral current, reduce power loss and improve the VUF of a modified IEEE 69 bus system.