Transformer Leakage Inductance Calculation Method with Experimental Validation for CLLLC Converter Topology

Zhi Yang, Mustafa Tahir, Sideng Hu (), Qiuyan Huang and Haoqi Zhu
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Zhi Yang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Mustafa Tahir: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Sideng Hu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Qiuyan Huang: Wanbang Digital Energy, Changzhou 213100, China
Haoqi Zhu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2022, vol. 15, issue 18, 1-14

Abstract: Leakage inductance is one of the key parameters of a transformer, and it is often intentionally integrated into transformers. Rogowski’s equation is generally used for leakage inductance calculation; however, it is only applicable to concentric winding transformers where windings have the same height. Consequently, it has limited applications. This paper proposes a transformer leakage inductance calculation method using a double Fourier series. The limitation of Rogowski’s leakage inductance equation was analyzed in practical applications, and a new model for calculating the leakage inductance of a double-group-overlapping winding transformer was derived. Experimental prototypes of transformers were developed, and their simulation models were built in Ansys. The correctness of the proposed calculation method for transformer leakage inductance using a double Fourier series was verified by comparing the calculation results with the simulation and measured ones. A sensitivity analysis was also conducted by studying the variations in different parameters that might affect the leakage inductance value. The proposed calculation model gives an intuitive and simple method with less calculation and design effort while maintaining reasonable accuracy for leakage inductance calculation. In addition, the featured double Fourier series approach has a wider range of applications than Rogowski’s equation.

Keywords: double Fourier series; leakage inductance; unified expression of leakage inductance calculation; current density (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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