摘要:
针对数字控制单相全桥电压型逆变电路的非线性动力学特性分析,本文建立了一种改进离散迭代模型.改进离散迭代模型结合了平均模型和传统离散迭代模型的优点,能够精确分析数字控制延时以及采样保持过程对系统非线性动力学特性的影响,可以在保证精确度的前提下显著降低离散迭代建模过程的复杂程度.本文以LC滤波器电容电压外环、电感电流内环反馈加给定电压前馈的数字控制系统为例,建立了数字控制单相全桥电压型逆变电路的改进离散迭代模型,采用新模型分析了系统的非线性动力学特性,并准确预测了系统的稳定范围以及失稳现象.最后,利用SIMULINK仿真模型和物理实验验证了改进离散迭代模型的正确性和有效性.
Abstract:
An improved discrete-time model for a digital controlled single-phase full-bridge voltage inverter is proposed in this paper. Based on state-space averaging in every switching cycle, the improved discrete-time model combines the advantages of the average model and the traditional discrete-time model, which can accurately analyze the digital control delay and sample-and-hold process inherently in digital controlled system. Consequently, under the accuracy premise, the improved discrete-time model can effectively simplify the traditional discrete-time modeling. As an example, an LC filter capacitor-voltage and inductor-current feed-back plus voltage-reference feed-forward control algorithm is analyzed based on the improved discrete-time model. The stability boundary and oscillation frequency are accurately predicted. Finally, theoretical results are verified by simulations and experiments.
首页
登录
注册
下载: