Converter is one of the core components of the wind turbine and its fault time will directly affect the power generation and the cost. Its reliability will be more important in higher wind turbine reliability and critical conditions. The shutdown fault caused by the increased temperature has become one of the important factors that influence the reliability. The main factors of converter temperature increasing are analyzed in this paper, and the main control parameters, such as switching frequency, wave mode, and absorption capacitance, are designed optimally, and the protection and treatment measures and optimization process of over temperature are given. Comparison analysis based on 1.5 MW doubly fed wind turbine converter is carried out. Finally, the experimental data shows that the temperature of the converter would be significantly decreased under the same conditions, and the experimental results prove the effectiveness of the process. This work is supported by Sinopec Group Funded Projects (No. 317018) and National Natural Science Foundation of China (No. 61603263).