tailieunhanh - Energy flow function and operational strategy of CCHP system

The energy flow characteristics of Combined Cooling, Heating and Power (CCHP) system are analyzed in detail and the energy flow function is proposed for its two operational strategies: thermal load dominant mode and electrical load dominant mode. | 374 The Open Electrical Electronic Engineering Journal 2015 9 374-379 Send Orders for Reprints to reprints abenthantscience. ae Open Access Energy Flow Function and Operational Strategy of CCHP System Yuan Xiaodong1 Bian Haihong 2 and Shi Mingming1 State Grid Jiangsu Electric Power Company Nanjing Jiangsu 211103 . China 2School of Power Engineering Nanjing Institute of Technology Nanjing 211167 . China Abstract The energy flow characteristics of Combined Cooling Heating and Power CCHP system are analyzed in detail and the energy flow function is proposed for its two operational strategies thermal load dominant mode and electrical load dominant mode. In order to improve its economic and environmental efficiency an optimal economic and environmental dispatch model is built which includes the fuel cost power purchase cost and pollution emission penalty as environmental cost in its objective function and takes the energy flow function as its energy balance equality constraint. Case simulation shows that the proposed energy flow function and model optimizes the dispatch of CCHP system reduces the productive cost improves the environmental efficiency and enhances the energy utilization level. Keywords CCHP operational strategy energy flow function thermal load dominant mode electrical load dominant mode optimization model. 1. INTRODUCTION CCHP system can provide cold energy thermal energy electrical energy and other forms of energy simultaneously to users. Owing to the advantages of energy cascade utilization and less polluting emissions CCHP gets wide attention across the world 1 - 3 . Different operational strategies determine the economical efficiency and environmental protection property of a CCHP system thermal load dominant mode and electrical load dominant mode 4 . The former mode preferentially meets heat load demand and the electricity shortage or surplus can be balanced by the connected main grid. On the contrary the latter mode preferentially meets .

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