【摘要】 随着农业和旅游等季节性负荷的显著增长，配变台区三相不平衡问题引起的配电设备故障和停电事故已经成为配电网运维面临的主要挑战，亟须加强对配变台区三相不平衡的评估。针对现有配电台区三相不平衡评估指标较少、权重分配方式单一的问题，在传统配电网三相不平衡评估方法上，提出一种计及零序电流的配电台区三相不平衡风险评估方法。先分析配电网零序电流和三相电流不平衡度与三相电流不平衡严重程度的相关性。再利用改进效用理论（improving utility theory,IUT），建立计及零序电流的配电台区三相不平衡评估模型，并基于层次分析法和反熵权法，提出一种组合赋权法，加强对三相不平衡和零序电流指标的综合分析。最后，采用实例对所提方法进行了验证。研究结果表明，所提风险评估方法可以更好地反映各配电台区三相不平衡严重程度，风险评估更准确。更多还原

【Abstract】 With the significant growth of seasonal loads such as agriculture and tourism, power equipment failures and power outages caused by the three-phase unbalance problem in distribution transformer areas become major challenges in the operation and maintenance of distribution networks. Therefore, it is urgent to strengthen the assessment of threephase unbalance in distribution transformer areas. To address the problems of few evaluation indices and single weight distribution methods for three-phase unbalance in existing distribution transformer areas, a risk assessment method for three-phase unbalance in distribution transformer areas considering zero-sequence current is proposed based on the traditional three-phase unbalance evaluation method for distribution networks. First, the correlation of the severity of three-phase current unbalance with both the zero-sequence current and the three-phase current unbalance degree of the distribution network is fully considered. Then, an evaluation model for three-phase unbalance in distribution transformer areas considering zero-sequence current is established by using the improved utility theory(IUT). Based on the analytic hierarchy process and the anti-entropy weight method, a combined weighting method is proposed to strengthen the comprehensive analysis of three-phase unbalance and zero-sequence current indices. Finally, an example is used to verify the method. The research shows that traditional single evaluation indices cannot effectively and comprehensively evaluate the three-phase unbalance degree in distribution transformer areas, while the proposed risk assessment method can better reflect the severity of three-phase unbalance in each distribution transformer area, achieving more accurate risk assessment.更多还原