柔性输电用低频变压器电磁分析与多目标优化设计

Aiming at the problem of significant increase in weight and loss faced when the transformers for flexible AC power transmission are remodeled at low frequency,the electromagnetic structure of low-frequency transformer is analyzed and optimally designed. The effect of frequency change on the electromagnetic properties of electrical steel and transformer is analyzed. A parameterized model of the low-frequency transformer is then established by using finite element software,with operating losses and effective material weight as the optimization objectives. The optimization parameters are classified through sensitivity analysis, and various methods such as multi-objective optimization using genetic algorithms,response surface methodology,and parameter scanning are applied to optimize parameters with different sensitivities. The hot spot temperature of the optimized results is constrained using temperature field simulation. The optimal samples are selected to compare with the parameters of the unoptimized low-frequency transformer model, so as to verify the effectiveness of the optimized design scheme.