Nonlinear Integrated Control Strategy of Cascaded Power Electronic Transformer

被引：0
|
作者：
Sun Y. [1 ]
Zhu J. [1 ]
Fu C. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding, 071003, Hebei Province
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 09期
关键词：
Dynamic response; Integrated control; Nonlinear control; Power electronic transformer (PET); Self-equilibrium; State feedback exact linearization;
D O I：
10.13334/j.0258-8013.pcsee.190957
中图分类号：
学科分类号：
摘要：
Aiming at the complex nonlinear and multi-coupling characteristics of the cascaded power electronic transformer (PET), a nonlinear integrated control strategy based on differential geometric theory was proposed. The multivariable affine nonlinear model of cascaded PET was firstly established according to the multi-port and internal control objectives. Secondly, based on the exact linearization principle of multi-input multi-output system in differential geometry, the nonlinear coordinate transformation and state feedback laws were derived. The control parameters were designed using pole placement of second-order systems, thereby a nonlinear integrated and coordinated control strategy of the PET was obtained. The proposed control can linearize the system exactly, so as to simplify and clarify the control parameter tuning process, adjust the bandwidth of variables as required, then improve the system dynamic responses under large disturbance. Moreover, the sub-module balancing control can be directly realized. Finally, the validity and superiority of the proposed strategy in comparison with the traditional control was confirmed by simulation and experiments. © 2020 Chin. Soc. for Elec. Eng.
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页码：2891 / 2902
页数：11
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