RESEARCH ON NONLINEAR DYNAMIC BEHAVIOR OF AN IMPROVED QUASI-Z-SOURCE SINGLE-PHASE INVERTER

Cao Yichang; Ding Xinping; Wei Zhengyi; Wang Fenglian; Zhou Mingzhu; Li Kai

doi:10.19912/j.0254-0096.tynxb.2021-0496

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 60-67. DOI: 10.19912/j.0254-0096.tynxb.2021-0496

RESEARCH ON NONLINEAR DYNAMIC BEHAVIOR OF AN IMPROVED QUASI-Z-SOURCE SINGLE-PHASE INVERTER

Cao Yichang¹, Ding Xinping², Wei Zhengyi¹, Wang Fenglian¹, Zhou Mingzhu¹, Li Kai¹

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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.

Key words

photovoltaic / bifurcation / nonlinear dynamical systems / discrete time control / quasi-Z-source inverter

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Cao Yichang, Ding Xinping, Wei Zhengyi, Wang Fenglian, Zhou Mingzhu, Li Kai. RESEARCH ON NONLINEAR DYNAMIC BEHAVIOR OF AN IMPROVED QUASI-Z-SOURCE SINGLE-PHASE INVERTER[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 60-67 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0496

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