In order to better solve the terminal voltage deviation problem and network loss problem of distribution network with large power supply radius

the multi-objective optimization algorithm for determining the impedance value and installation position of the series compensation device is studied.The multi-objective optimization model of the distribution network series compensation device is established based on the line voltage deviation and the minimum network power loss.The NSGA-Ⅱ algorithm is used to solve the multi-objective optimization model

and the Pareto solution set is obtained.Then the optimal solution is obtained in the solution set by TOPSIS（technique for order preference by similarity to an ideal solution）method.The feasibility of the model and the effectiveness of the algorithm are verified by an IEEE 34-node distribution network.The results show that the model and method adopted in this paper can quickly and effectively determine the installation position and capacitance value of the series compensation device.In addition

the optimal installation position of the series compensation device under different load conditions is different

and the multi-point series compensation method can be used to obtain better effects.