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A new mathematical model of satellite channel was proposed. On the basis of the analysis of high-speed remote sensing satellite link, and combining vector network test results, we obtained a new mathematical model of a high-speed satellite link. Through simulation analysis, the amplitude-frequency characteristics and group delay characteristics of the model is corresponded with the actual link. The model laid the foundation for analysis of future high-speed data transfer between satellite and ground

Renewable energy sources (RESs) generally connected with electric power system via power electronic interface. This paper presents a reactive power and voltage (Q/V) control strategy of three-phase photovoltaic (PV) system to offering reactive power based on the typical dual-loop control topology. It is worth mentioning that control strategy can support reactive power when a low voltage fault occurs in AC bus without additional compensation device. With the help of the decoupling control, the PV array can generate active power as much as possible in variable external solar radiation conditions. The voltage of PV arrays is adopted as the objective, which on account of the easy availability and controllability of voltage, to control output active power. Besides, accurately modeling process from a PV cell to PV array is described in the beginning to acquire the P-V and V-I characteristics of PV arrays, which promote the designment of Q/V control.