Low-Frequency Stability Analysis Of Photovoltaic Storage Integration Into Vehicular Network Based On Optimized Exclusion Zone Criterion

The western region of China has abundant photovoltaic resources. Photovoltaic has a good prospect to connect storage to the railway to realize new energy power supply. Low-frequency oscillation will be caused when photovoltaic energy storage is connected to traction power supply system through railway power conditioner (RPC). In order to accurately and quantitatively analyze how the photovoltaic storage affects the stability of the system, an impedance model of the photovoltaic-storage-train network coupling system based on the dq coordinate system is established. By analyzing and optimizing the mechanism of the excluded zone criterion and greatly reducing the range of the excluded zone, the conservatism of the original criterion is reduced and the phenomenon that the actual stable system is misjudged to be unstable is significantly reduced. The simulation of the train network system before and after the access of photovoltaic storage is compared and the low frequency stability of the system is improved by adjusting the parameters of the RPC controller.