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Distributed energy supply system mainly refers to the distributed power and CCHP systems, this system can effectively utilize limited resources and reduce environmental pollution and to supplement power grid security and reliability, and its small investment, quick low emissions, low loss power transmission and energy efficiency advantages, become the future energy supply system trends. In this paper, a hospital in Tianjin for the study, the analysis of its winter, summer, spring and autumn when the typical day-by thermoelectric cooling load, based on the establishment of CCHP system mathematical model of all major equipment, and focuses on the system energy storage device in the operating characteristics and its influencing factors, the findings indicate that storage device inlet velocity, inlet and outlet temperature, storage ratio greater impact on the storage process. CCHP system can run efficiently is the key to its operation strategy and system configuration optimization, so that both can improve the efficiency of the system, allowing the system to run at full load as much as possible, but also can effectively reduce the system's fixed investment costs. Based on the equipment capacity, quantity, performance, TOU and natural gas prices, etc., required to meet the user load conditions, respectively, at minimal operating costs and minimum number of the selected device (ie, the most simple system structure, the initial investment minimum) as the objective function to establish a mixed-integer nonlinear (MINLP) multi-level objective function, and uses the penalty function and the combination of dynamic programming method for solving the objective function analysis. Based on the specific examples of the analysis, the gas turbine power generation, natural gas prices, peak price ratio, storage tank volume and other factors on CCHP system, the results show that the peak price ratio relative to the price of natural gas and gas turbine power generation efficiency, the less impact on the system, noting that for every CCHP systems are there exists an optimal storage capacity, in this volume, the system storage device is able to play its best peak shift valley, improve system efficiency role, while the economics of the system also will be greatly improved. In the system was optimized, this article will introduce energy storage aspects of CCHP system, no storage device CCHP systems and conventional points for the system from the economic indicators, energy efficiency and other aspects of comparison, thus illustrate aspects of the introduction of the accumulator CCHP system superior performance.
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