Large temperature difference central heating system using electric compression type heat pump

The invention discloses a large temperature difference central heating system using an electric compression type heat pump. The large temperature difference central heating system comprises a condenser and a cooling tower which form a circulation loop, the cooling tower is connected to a medium temperature heat pump and a high temperature heat pump through a circulating cooling water return waterpipeline, a part of circulating cooling water from the condenser enters the cooling tower, and a part of the circulating cooling water enters the medium temperature heat pump and the high temperatureheat pump through the circulating cooling water return water pipeline; the circulating cooling water discharged out from the medium temperature heat pump and the high temperature heat pump passes through a circulating cooling water supply pipe and the condenser; and primary heat network return water is connected to the medium temperature heat pump through a pipeline and a second valve installed onthe pipeline, primary heat network return water heated by the medium temperature heat pump sequentially passes through a first high temperature heat pump, an electrode heating device and a heat storage device to communicate with a primary heat network water supply pipe. On the basis of an existing turbine steam extraction heating system, a thermal power plant side electric heating system is connected in parallel, and under the condition that the thermal power plant running working condition is not changed, the heating capacity of a pipe network is increased.