Abstract
Superbuck converter is a high-order converter with complex nonlinear dynamic characteristics, such as bifurcation and chaos, which will affect the stability of photovoltaic power generation systems. In this paper, the nonlinear dynamics of the voltage mode control Superbuck converter are studied. Taking reference voltage, input voltage, and output voltage error amplification factor as bifurcation parameters, the evolution process of the system from a stable state to bifurcation to a chaotic state is analyzed. The bifurcation forms of the converter under three bifurcation parameters are all period-doubling bifurcations. In this paper, the linear sliding mode control method is used to suppress and clear the nonlinear phenomenon of the system so that the converter in the chaotic state and unstable operation state can be restored to a stable single-cycle state in about 0.6ms.
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