A modeling method of a bi-directional DC-DC converter

The invention discloses a modeling method of a bi-directional DC-DC converter which comprises the following steps of respectively establishing a Lagrange mechanics-based model of a bi-directional DC/DC converter of a hybrid electric vehicle hybrid power supply system according to the modal 1, the modal 2 and the modal 3 of a Buck mode and a Boost mode thereof; the models are discretized separately. Based on the discretized Lagrangian model and hybrid automata theory, the discretized Lagrangian model is extended, and the differential equation corresponding to the discretized Lagrangian model isembedded in the discrete event state automata model, so the hybrid automata model is obtained, and certain technical effect is realized. 本发明公开了种双向DC-DC变换器的建模方法，所述方法包括：根据实施对象混合动力汽车复合电源系统双向DC/DC变换器的Buck模式和Boost模式的模态1、模态2、模态3，分别建立其基于拉格朗日力学的模型；分别对建立的模型进行离散化；基于离散化的拉格朗日模型和混杂自动机理论，将离散化的拉格朗日模型进行拓展，将离散事件状态自动机模型中嵌入离散化的拉格朗日模型对应的微分方程，获得混杂自动机模型，实现了...的技术效果。