在电力市场中,由于供求曲线呈阶梯状的特性,使得出清电价可能会出现多解情况.考虑到多解情况的非频发性,一个简便有效的判定方法可以节省大量的冗余计算.因此,根据线性无关约束规格与拉格朗日乘子唯一的对应关系,文章提出了一种利用线性无关约束规格(linear independence constraint qualification,LICQ)判定节点电价对偶问题多解情况是否发生的方法.最后,文章从理论分析和具体算例两方面验证了该判定方法的有效性.“,”In electricity markets, the stepwise supply and demand curves may yield multiple clearing prices. Considering the possibility of rare occurrence of this circumstance, a simple and effective identification method can significantly reduce the computational complexity. Capitalizing on the relationship between the linear independence constraint qualification and the uniqueness of Lagrange multipliers, this paper proposed an approach by using independence constraint qualification to identify the existence of multiple dual solutions in the nodal pricing problem. The validity of the proposed method was corroborated by theoretical analysis and case studies.