SPWM-H桥逆变器的2种离散模型及复杂行为研究

Research on Two Discrete Models and Complex Behaviors in SPWM-H Bridge Inverter

以比例控制下SPWM-H桥正弦逆变器为研究对象,采用迭代法推导出2种PWM原理下的一阶离散数学模型,用以研究电路参数对系统运行状态的影响。通过数值仿真分析发现系统运行过程中存在复杂行为,并对这2种离散模型的稳定性进行了比较,进一步讨论了系统稳定运行的参数域。最后分析了系统在不同开关频率下,2种离散模型的适用性问题。

With a SPWM-H bridge inverter under proportional control as the research object, two kinds of one-dimension dis- crete mathematical models are established based on different basic principles of PWM. The models are derived with the iterative method to study influences of circuit parameters on the system running state. By means of the numerical simulation analysis, it is proved that there exist complex behaviors in the operation process. Stability analyses of two discrete models are compared to explore the parameter domain of the system＇ s stable operation. Lastly, the applicability of two models is indicated according to the switching frequency of the system.