Research Of Ice Storage System Operating Strategy And Electric Charge Structure

Thermal Storage technology, a measure which can make peak load shifting and adjustment contradiction between supply and demand sides due to the time difference, has become a very effective techniques on a background which urban electrical load difference is increasing. Economic benefit of thermal storage technology mainly includes socio-economic benefits and user economic benefits. On one hand, from a social macro point of view, peak load shifting of the electrical load can reduce the cost of city power capacity and improve the efficiency of power plants, this is a positive externality of thermal storage techniques; on the other hand, from the user microscopic point of view, there are many policies for encouraging, such as peak and valley electric charges, peak shifting subsidies etc, which can reduce the user’s operating costs. However, the operating strategy and tariff structure of a thermal storage system as the primary controlled variable affects the development of this technology, how to select the appropriate operating strategy, and how to set the electricity price, it is necessary to in-depth study.Based on a practical ice storage projects, by simulating the all-year hourly dynamic load of the project, establishing energy consumption model of each element of the system, and designing of annual cold allocation procedures, analyzing the system running status in the current tariff policy. Using sensitivity analysis method, by adjusting the electrical price, analyzing the sensitiveness of Cooling-supply-cost per cooling capacity(PE) and Static payback period(PT), as a theoretical basis for regulating electricity price.This paper presents the concept of synthetical cooling-supply-cost per cooling capacity index SPE, by using sensitivity analysis method, analyzing the sensitiveness of different running modes’ SPE to electrical price fluctuation. We can draw a conclusion that different running modes with the electrical price fluctuation present linear trend; the sensitiveness of SPE by peak electrical price(?) to two modes, which are duplex mode chiller cooling mode and base chiller cooling mode two modes, is 1.00; Peak electrical price(?) to ice storage tank cooling mode’s SPE sensitiveness is 0.03 while valley electrical price() to this mode’s SPE sensitiveness is 0.97. Designing a reference system which using conventional cooling source system for economic analysis, statistics the initial investment of the two systems, based on the all-year hourly dynamic load, solving the operating costs of conventional cooling source system, and the use of static evaluation index calculation the static payback period = 8.86 a. Finally, combined with static evaluation index and sensitivity analysis to make a comprehensive analysis of the influence of electricity price, conclusions show that within a certain range(less than 16%) to adjust upward peak static electricity can effectively shorten the payback period of the ice storage system.