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以交直流互联系统有功损耗和所有关键节点电压偏差平方和最小化为目标，建立交直流互联系统的多目标无功优化模型，并提出一种求其帕累托最优解的改进规格化法平面约束法。该算法针对帕累托前沿上各点的切线与乌托邦线夹角不同，对规格化法平面约束法进行改进，即将帕累托前沿按照一定规则分割成4段，每段对应1个子乌托邦线，从而将原多目标优化问题分解为4组多目标优化问题。再对每个子乌托邦线进行等距离分割处理，每组多目标优化问题可转化为求解一系列单目标优化问题。对南方电网交直流765节点等值系统的计算表明，所提出的算法能够有效求解实际交直流大电网多目标优化问题，且所求得的最优解集在帕累托前沿上分布更均匀。“,”In order to minimize both active power loss and square sum of voltage deviation in all key nodes, a multi-objective reactive power optimization model of AC/DC interconnection system was built and an improved normalized normal constraint method was proposed to obtain Pareto optimal solutions of this model. The proposed method, considering the difference of the angle between Utopia line and tangent line of each Pareto frontier point, is an improvement of the normalized normal constraint method. In this improved normalized normal constraint method, the Pareto frontier was divided into four segments according to certain rule, each segment corresponds to a sub-Utopia line, and hence the original multi-objective optimization problem was translated to four sets of multi-objective optimization problems. The four sub-Utopia lines can be divided by equidistant respectively, and each set of multi-objective optimization problem can be converted to solve a series of single objective optimization problems. Results on the 765 nodes equivalent system of China Southern power grid demonstrate that the multi-objective optimization problem in large AC/DC power grid can be solved effectively by the proposed method and the distribution of optimal solutions at Pareto frontier becomes more uniform.