A Study Of Dynamic Matching Performance Of Building Renewable Energy System In Tianjin

Various kinds of renewable energy especially solar and wind energy are gradually increasing the proportion in energy building system,micro-grid system and so on.Also,renewable energy becomes the main alternative energy for fossil energy.However,Renewable energy is intermittent and instability,which restrict its development for large scale.Besides,the role of building is changing from energy consumer to energy producer with the help of new concept such as low/zero energy building,energy hub and so on.All above elements lead new challenge in design,operation and other questions for energy building system.Therefore,the matching performance between renewable energy supply and building consumption becomes a new research focus.Matching performance is the key point to increase the application proportion of renewable energy.The assessment of building renewable energy system usually focus on energy,economic,and environment.But in this article,we contribute to load matching assessment and optimization of residential building energy system.Based on the evaluation of renewable energy resources and typical PV and wind power operation in Tianjin,a residential renewable system for 90 m~2 single building is established by using dynamic simulation software TRNSYS.By simulating the production and consumption of renewable energy system,the load matching indexes:on-site energy fraction(OEF)and on-site energy matching(OEM)are applied to analyze the matching performance of renewable energy system in different time scale.Then further clarify is ensured for the importance of load matching in design,operation and evaluation of building energy system.Finally,the optimization software GenOpt is applied to optimize the matching performance of above renewable energy system,thus the optimal configuration of the system is obtained under higher matching results.The main conclusions are presented below:(1)For the 90 m~2 residential building equipped with 2.7 kW PV,5kW wind turbine,load can be 100%satisfied when evaluated by year,while on-site energy fraction is under 55%with time scale of month and hour.(2)Through dynamic analysis of load matching,different characteristics of time scale can be obtained:OEF and OEM are above 0.35 when considering monthly time scale;While under hourly time scale,load matching index changed in a wide range.(3)When the number of PV in parallel is 14 and the battery capacity is 786 Ah,the load matching index reached the maximum value under hourly time scale.It increased by 21.88%compared with the initial state.