Calculation of Inductance Parameters for Large AC Excitation Machine Based on Field-Circuit Coupled Model
Kang Haoyu1, Ma Yiming2, Sun Lu1, Wang Jin1, Zhou Libing1
1. State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. China Southern Power Grid Power Generation Co. Ltd Energy Storage Research Institute Guangzhou 511499 China
Abstract：Large AC excitation machines are widely used in variable-speed pumped-storage power plants due to their excellent dynamic characteristics and wide speed regulation range. The inductance parameters of the AC excitation machines exert a direct influence on the operational performance and protection setting of the power station. Consequently, it is essential to conduct precise calculations. The finite element-based computational method with high accuracy is time-consuming. Furthermore, substantial variances exist among the current analytical calculation models for the diverse leakage inductance of motors, complicating the process of inductance modeling and solution. Therefore, the paper proposes an analytical model of the inductance for the AC excitation machine based on a field-circuit coupling model. Firstly, the exact subdomain approach and the magnetic network method are integrated to establish a field-circuit coupling model of the AC excitation machine, considering the saturation effect. The vector magnetic potential of each subdomain is solved. Secondly, based on the motor vector magnetic potential, a complete analytical model of the slot leakage inductance, harmonic leakage inductance, tooth tip leakage inductance, and excitation inductance of the motor is established according to the energy method and flux linkage method. The end leakage inductance is calculated using the numerical integration method of the vector magnetic potential. Finally, taking a 10 MW AC excitation machine as an example, the errors of the stator leakage inductance, rotor leakage inductance, and excitation inductance calculated by the proposed method are 4.0%, 3.1%, and 4.5% of the finite element method, and the errors are 2.72%, 5.12%, and 3.76% of the experiments, respectively. The computational errors of the proposed approach are significantly reduced, falling into the engineering-permissible range. The inductance field-circuit coupling solution model established in this paper has a simple modeling process and a straightforward physical process. Compared with the finite element method, this model can significantly reduce the calculation time and has higher accuracy. The inductance analytical model can be used for power limit and operational stability prediction, as well as the rapid optimization design of the electromagnetic schemes.
康皓宇, 马一鸣, 孙鲁, 王晋, 周理兵. 基于场路耦合模型的大型交流励磁电机电感参数计算[J]. 电工技术学报, 2025, 40(18): 5805-5817.
Kang Haoyu, Ma Yiming, Sun Lu, Wang Jin, Zhou Libing. Calculation of Inductance Parameters for Large AC Excitation Machine Based on Field-Circuit Coupled Model. Transactions of China Electrotechnical Society, 2025, 40(18): 5805-5817.
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2025, Vol. 40 
