A Configuration Strategy of Photovoltaic and cold Storage for Refrigeration System

With the increasing energy consumption in the refrigeration system, the environmental problems such as global warming and ozone depletion are becoming more and more serious. On this background, it is practical significant to provide options for energy-saving renovation in the refrigeration field. The paper takes a low-temperature cold storage as the research object. Firstly, according to the refrigeration system of the cold storage, two schemes of combining photovoltaic (PV) with lead acid battery and combining photovoltaic with ice thermal storage are proposed. Secondly, an optimal configuration method of the PV and energy storage system is proposed aiming at minimizing economy, as well as carbon dioxide emission. Detailed power balance and equipment operation constraints are established. The proposed optimization model is formulated a mixed-integer linear programming. A case study on a cold storage project in China with typical data of cold storage in summer, winter and transitional seasons is conducted. Case study demonstrates that the scheme with photovoltaic collaborating lead acid battery is the best solution. Meanwhile, it also shows that the energy storage equipment can reduce the total cost of the system, improve the utilization rate of photovoltaic, and promote economic and environmental benefits of the system.