Optimal Operation And Design Analysis On BCHP System With Energy Storage

With the development of economy and adjustment of city energystructure, heating, cooling and power demand is widely needed. With the keytechnology advances, especially the occurrence of micro-gas turbine and fuelcell, distributed cooling, heating and power technology has been widelycaused attention. While existing CHP system in China has been in pooreconomic performance, this not only has relationship with specific energycost, power regulation and other institutional factors, but also reflects existingproblem in the cooling, heating and power load forecasting analysis andsystem configuration.SR ratio is introduced to correctly evaluate building load distributioncharacteristics. SR reflects the main feature of building load profile, and canquantify the correlation between building's electric, heating and cooling load.And it also can be used for comparison of the utmost potential of heatrecovery from cogeneration in different buildings. The result shows officebuilding is more attractive than hotel with energy storage.This paper considers the whole year working condition in order to reflectthe influence of load variation on CHP operation. An optimal operationalplanning model is established for cogeneration system with energy storage.The daily operational strategy of constituent equipment is determined so as tominimize the daily operational cost subject to the energy demand requirement.Effects of energy storage on the operation of cogeneration system areexamined through a numerical study on a gas engine-driven cogenerationsystem installed in a hotel and office building. This paper analyses theoptimal size of cogeneration equipment using marginal investment recoveryterm and annual total cost. Some examples show CHP without energy storageis more attractive. In the optimal operation principle, the optimal electricitygeneration design ratio is investigated for office and hotel in Beijing. Inenergy saving principal, CHP system without energy storage has larger annualtotal cost than system with energy storage.This paper also analyses the optimal peak and valley electricity priceratio under certain base electricity price for office and hotel building. Lowerbase electricity price is more sensitive for additional investment recoveryratio. This illustrates the base electricity price and gas price ratio is moredecisive in BCHP economic evaluation.