IMBALANCE MULTI-OBJECTIVE OPTIMIZATION METHOD OF THREE-PHASE LAOD FOR DISTRIBUED PHOTOVOLTAIC POWER DISTRIBUTION NET WORK CONSIDERING RISK OF VOLTAGE OVERRUN; [计及电压越限风险的含分布式光伏配电网三相载荷不平衡多目标优化方法]

In order to solve the three- phase imbalance problem of medium and low voltage distribution network with distributed photovoltaics，a three-phase imbalance optimization method for distribution network considering the risk of voltage overrun is proposed. Taking the three-phase imbalance comprehensive index，voltage overrun risk index and optimization complexity index as the minimizing optimization goals，a three-phase imbalance multi-objective optimization model is constructed. A two-stage optimization algorithm of day-ahead and day-during is proposed，and the prior knowledge is obtained by solving the single-objective optimization problem converted by the original multi-objective problem，which improves the traditional NSGA-Ⅱ algorithm in the selection way of the initial population，then the multi- objective problem can be optimized by the improved NSGA- Ⅱ algorithm. Finally，through analyzing the simulation results，the optimization method proposed in this paper can significantly improve the three-phase imbalance problem of medium and low voltage distribution network，and at the same time effectively suppress the risk of voltage overrun of the system caused by distributed photovoltaics. © 2023 Science Press. All rights reserved.