A photovoltaic power generation and rock energy storage integrated system and method

Abstract

The invention discloses a photovoltaic power generation and rock energy storage integrated system and method, comprising a photovoltaic power generation panel, a non-azeotropic mixed working medium Rankine cycle power generation system and a rock energy storage system. A low-temperature heat exchanger and a high-temperature heat exchanger inside, the non-azeotropic mixed working fluid Rankine cycle power generation system includes a compressor and an expander, wherein the outlet of the compressor and the inlet of the expander and one end of the low-temperature heat exchanger The other end of the low temperature heat exchanger is connected with one end of the high temperature heat exchanger, and the other end of the high temperature heat exchanger is connected with the outlet of the compressor and the inlet of the expander; the photovoltaic power generation panel is connected with the motor, generator and power grid The output shaft of the motor is connected with the drive shaft of the compressor, and the drive shaft of the generator is connected with the expander. The system and method can realize the integration of photovoltaic power generation and rock energy storage.

Description

technical field [0001] The invention belongs to the technical fields of solar energy utilization, energy storage and energy saving, and relates to a photovoltaic power generation and rock energy storage integrated system and method. Background technique [0002] The western region of my country is rich in solar energy resources, but due to the lack of water in the western region, it is difficult to build large-scale hydropower stations, so it is difficult to store electric energy on a large scale. At the same time, due to the lack of groundwater resources in the western region, it is difficult for the heat of the boulders in the soil to be taken away by the groundwater, making it a natural energy storage medium, which can save a lot of investment in the construction of energy storage containers (compared to the dams of pumped storage power plants). , compared with compressed air storage tanks). For the utilization of medium and low temperature heat sources, the non-azeotrop...

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Problems solved by technology

For the utilization of medium and low temperature heat sources, the non-azeotropic working medium can make the heat transfer temperature difference between the heat source / cooling source and the working medium less than 5 degrees Celsius, and can effectively generate electricity when the temperature difference between the heat source and the cold source exceeds 40 degrees Celsius, thus Make the system achieve higher thermal efficiency, and there is no technology that combines photovoltaic power generation with rock energy storage in the prior art

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