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Bifurcation analysis of photovoltaic-battery hybrid power system with constant power load

The photovoltaic-battery hybrid power system is a kind of flexible renewable power generation system, which is composed of a photovoltaic array and a battery connected to an output DC bus via power converters. The system can work with multiple structures and multiple operating modes due to the source and load states. Particularly, the nonlinear nature of the constant power load will destablize the system under different operating modes. In this paper, the bifurcation phenomena are identifed in this kind of system when the local load working as a constant power load. It is obersed that the loading has a nonlinear impact on the system and leads to low-frequency Hopf bifurcation and catastrophic bifuration which is an irreversible instability in the system. Based on the averaged model, the two bifurcation is analyzed and the stability boundaries are located. Finally, the instability phenomena are verified by experimental measurements in a practical PBHPS of 200 W.