The invention relates to the technical field of 
electric power system configuration and discloses a substation 
capacity planning method based on the mixed 
quantum evolutionary algorithm. According to the technical scheme, the substation 
capacity planning method comprises steps of substation data collection, substation capacity configuration and result output. The substation capacity configuration comprises the steps that firstly, a 
system is initialized; secondly, the state of a 
population Q (t) is observed and an observation state 
population P (t) is produced; thirdly, local search is performed on individuals in the observation state 
population P (t); fourthly, decoding is performed, and a variable optimal solution is obtained; fifthly, fitness evaluation is performed on an objective function; sixthly, the optimal individual and 
relevant information are stored; seventhly, end conditions are judged; eighthly, the population is updated. According to the substation 
capacity planning method based on the mixed 
quantum evolutionary algorithm, the advantages of strong capacity in 
global optimization and a fast convergence rate of the 
quantum evolutionary algorithm and the 
advantage of strong capacity in local search of the 
tabu search algorithm are combined, therefore, an optimized capacity configuration scheme of a substation can be fast and accurately obtained, and an output result can be fast and accurately obtained.