Abstract：Along with the development of renewable energy, DC distribution power system (DPS) becomes more and more attractive. Although every single converter is well-designed based on the stand alone operation with sufficient stability, the stability of entire system is still a big concern due to the complex interactions among converters especially when large-signal disturbance occurs. Theoretical research efforts in this area are rare, and not systematic enough. A simple, effective and unified large signal model is the foundation for large-signal stability analysis. Since current-mode control is widely adopted for better performance, this paper proposes a unified large signal model for current-mode controlled DC-DC converter based on the gyrator theory. This model is order-reduced, and the input-output expression is simple. Only one parameter in the model needs to be modified according to different DC-DC topologies. Because of the above advantages, this model provides foundation and possibility for theoretical analysis, and analytical large-signal stability criterion could be derived based on it. Simulation and experiments are carried out based on Buck, Boost and Buck-Boost converters to verify the feasibility of the proposed model. Meanwhile, in order to verify that the proposed model contains all the information of the original converter, small-signal features around the equilibrium point are obtained and compared with the most accurate conventional small-signal model. Results are satisfied and consistent with each other.
杜韦静, 张军明, 钱照明. 基于回转器理论的电流模式控制型DC-DC变流器统一大信号模型[J]. 电工技术学报, 2015, 30(1): 127-134.
Du Weijing, Zhang Junming, Qian Zhaoming. Unified Large Signal Model for Current Mode Controlled DC-DC Converters Based on Gyrator Theory. Transactions of China Electrotechnical Society, 2015, 30(1): 127-134.
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