Abstract：The three-stage generator-based airborne high voltage direct current (TSG-HVDC) power supply system has a complex structure and strong nonlinearity, leading to high impedance modeling and integration complexity. The low complexity impedance model of the TSG-HVDC power supply system is the premise of stability analysis and design. Existing research on the impedance reduction model and scope of application is relatively scattered, which hinders the stable theoretical analysis of the TSG-HVDC power supply system. Considering the differences in operation and processing between rotating/stationary rectifiers and multi- pulse transformer rectifier units, this paper derives the output impedance model by integrating each subsystem's equivalent circuit and two-port H parameter. Then, a vector fitting-based order-reduction analysis process of the two-port H parameter is designed, and the reduced impedance model with optimal wideband root mean square error is obtained, as well as the impacts of each subsystem on the overall output impedance. Subsequently, a multi-parameter coordinated tuning method based on load impedance interval description is proposed by combining the amplitude and phase sensitivity of the reduced-order model. Finally, compared with the time-domain simulation, scaled-down physical experiments, and controller hardware-in-the-loop, the accuracy of the impedance model and the robustness of the parameter tuning method are verified. The high consistency between the response of the small signal model under step disturbance and the dynamic process of the physical experimental waveform indicates the reliability of the overall small signal modeling method. Secondly, compared with the truncated order reduction results based on the singular perturbation method, the vector fitting order reduction has better model accuracy in the same order. Thirdly, the experimental results before and after parameter tuning are consistent with the stability characteristics of the time-domain simulation. The conclusions of this paper are as follows. (1) The original order of the complete output impedance model of the TSG-HVDC power supply system is as high as the 19th order. After order reduction using vector fitting, the minimum order required to describe it accurately is 9. (2) The dynamic processes retained in the reduced- order impedance of the TSG-HVDC power supply system include the PI control, the transient process of the excitation winding of the exciter, the transient process of the armature winding with the transient salient pole effect ignored, and the dynamic processes of the main generator (excluding damper winding impacts) and the TRU. (3) The proposed parameter tuning method can consider the distribution range of the load impedance. Combining the reduced-order impedance and the amplitude/phase sensitivity can coordinate the TSG-HVDC power supply system's parameters.
陈鹏伟, 姜文伟, 王子墨, 陈杰, 吴红飞. 机载三级式高压直流电源系统降阶阻抗建模及其参数整定方法[J]. 电工技术学报, 2025, 40(24): 7999-8014.
Chen Pengwei, Jiang Wenwei, Wang Zimo, Chen Jie, Wu Hongfei. Reduced Impedance Modeling and Parameter Tuning Method of Three-Stage Generator-Based Airborne High Voltage DC Power Supply System. Transactions of China Electrotechnical Society, 2025, 40(24): 7999-8014.
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2025, Vol. 40 
