以PI调节下的电流控制型光伏逆变器为研究对象,采用频闪映射法推导了系统的离散模型,提出了一种能有效确定占空比的方法.将逆变器输入电压作为分岔参数,得到了系统的动态分岔图.运用折叠图的方法得到了不同分岔参数值下系统输出电流的数值仿真图,验证了所推导的离散模型的正确性.最后,通过RT-LAB半实物实验平台得到系统输出电流的实验波形,进一步验证了离散模型的正确性.将分岔与混沌研究从简单的比例调节下的逆变器推广到PI调节下的逆变器,更深入地分析了光伏逆变器中出现的非线性行为.%Regarding the photovoltaic (PV) inverter which uses current control method with PI controller as the research object, the discrete model of system is built by the stroboscopic map, and a new method which can find the duty ratio is given. Putting the input voltage of the inverter as the bifurcation parameter, the dynamic bifurcation diagram is obtained. With different bifurcation , parameters, numerical simulation of the output current is gained by the folded diagram, which illustrates the validity of the discrete model. Finally, the experiment waveform of the output current is obtained by RT-LAB experiment platform, and the discrete model is further examined. The study expands the range of research on the bifurcation and chaos from the inverter with proportional controller to the inverter with PI controller, and makes a further study for the nonlinear behavior of the PV inverter.
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