提出改进型准Z源逆变器,通过集成改进的“倍压单元”提高逆变器的升压能力,减少输出电压的谐波含量。高阶非线性系统参数设计不当会使系统进入次谐波振荡和混沌等状态。针对逆变器非线性行为导致系统参数设计复杂及失稳现象,构建CCM模式下含有二倍频纹波的动力学模型,研究PI控制下的变换器非线性行为,分析不同输入参数和二倍频纹波对系统稳定性的影响,为改进型准Z源逆变器的参数优化和稳定设计提供参考依据。最后搭建1000 W样机验证理论分析的正确性。
Abstract
An improved quasi-Z-source inverter is proposed, which can improve the boost capability of the inverter and reduce the harmonic content of the output voltage by integrating the improved “multiplier voltage cell”. Improper parameter design of high-order nonlinear system will lead to sub harmonic oscillation and chaos. In order to solve the problem about system parameter design and instability caused by the nonlinear behavior of switching power supply, the dynamic model of the inverter with second harmonic ripple in CCM mode is constructed. Then the nonlinear behavior of PI controlled inverter is studied. The influence of different input parameters and second harmonic ripple on the system stability is analyzed, which could provide a reference for the parameter optimization and stability design of the inverter. Finally, a 1000 W prototype is built to verify the correctness of the theoretical analysis.
关键词
光伏 /
分岔 /
非线性动力学系统 /
离散时间控制 /
准Z源逆变器
Key words
photovoltaic /
bifurcation /
nonlinear dynamical systems /
discrete time control /
quasi-Z-source inverter
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基金
国家自然科学基金（51477079）; 山东省自然科学基金（ZR2020ME200）
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