What is the solar heat pump and phase change energy storage heat pump combined heating system?

The invention relates to a solar heat pump and a phase change energy storage heat pump combined heating system and a control method, comprising a solar heat collecting unit, a heat pump host unit, a phase change energy storage unit, an indoor terminal unit and a control unit, the solar energy collecting unit, the phase change energy storing unit and the Indoor Terminal Unit are respectively connected with the heat pump host unit, and the control unit is connected with the heat pump host unit and the Indoor Terminal Unit. By the method, the system can carry out phase change energy storage for the surplus heat when the solar radiation intensity is high, and the heat stored by the phase change energy storage material can be used as a low temperature heat source for indoor heating when the solar radiation intensity is low and at night, to ensure the continuity of heating, the system has always maintained efficient operation, maximum energy savings.