Abstract: Because the current method does not optimize the control parameters of flexible AC transmission

device，resulting in unsatisfactory control results，control delay and loss rise，a flexible AC transmission device

control method based on multi-objective optimization was proposed. The basic working principle of flexible AC

transmission device was analyzed. The reactive power transmission characteristics and operation mode of flexible

AC transmission device were obtained through the relationship between converter output voltage and power grid，

so as to build a double loop vector controller. The multi-objective modified teaching-learning  algorithm（MOMTLA）was used to optimize the Pareto solution set of controller parameters，and finally realize the control of flexible AC transmission device. Simulation results show that the proposed method can obtain satisfactory control results and reduce the loss and delay in the control process.

      Key words: multi-objective optimization；flexible AC transmission device；control technology；multi-objective

modified teaching-learning algorithm（MOMTLA）