Photovoltaic direct-driven direct expansion type solar heat pump cogeneration system and control method thereof

The invention relates to a photovoltaic direct-driven direct expansion type solar heat pump cogeneration system and a control method thereof. The system comprises a control structure, an electricity supply subsystem, a heat collection subsystem, a domestic hot water supply subsystem and a multi-source complementary heating subsystem, wherein the heat collection subsystem shares a heat storage water tank; the power supply subsystem and the heat collection subsystem share the solar photovoltaic and photo-thermal integrated assembly. According to the invention, the power supply subsystem efficiently provides electric energy for users; the heat collection subsystem solves the problem of continuous high energy consumption of a direct expansion type solar heat pump in a double-loop mode, and energy consumption is reduced while the cooling effect of the solar photovoltaic photo-thermal integrated assembly is guaranteed. The domestic hot water supply subsystem solves the problem that the hot water requirement and hea