根据Buck-Boost变换器的工作原理及其非线性特征,在电感电流连续导通模式和断续导通模式下,分别对Buck-Boost电路构建T-S模糊模型,在断续导通模式下,引入切换函数,统一了两种模式下电路状态方程和T-S模糊模型。仿真结果表明,Buck-Boost变换器经T-S建模后,输出电压平均值和电感电流的平均值的误差均在2%以内,符合实际应用的要求。T-S模糊建模的有效性和可行性得到验证。
According to the basic principle and the non-linear characteristic of the Buck-Boost converter, this paper separately constrncts the T-S fuzzy model of the Buck-Boost electric circuit under two patterns which are CCM and DCM. In order to uniform the circuit state equation and T-S fuzzy model under these two patterns, this paper introduces the switching function in DCM. The average output voltage and the average inductor current errors of the Buck-Boost converter in T-S fuzzy model are within 2% , in line with the actual application requirements. The effectiveness and feasibility of T-S fuzzy modeling is verified.