|Title:||Energy planning and advanced management strategies for an interactive zero-energy sharing network (buildings and electric vehicles) with high energy flexibility and electrochemical battery cycling aging|
|Advisors:||Cao, Sungliang (BSE)|
Yang, Hongxing (BSE)
Hybrid power systems
Hong Kong Polytechnic University -- Dissertations
|Department:||Department of Building Services Engineering|
|Pages:||161 pages : color illustrations|
|Abstract:||Clean power production, energy flexible buildings, plug-in vehicles and smart grids are key areas for fossil-free and carbon-neutrality district community. Energy flexible buildings have the capability to timely response and sufficiently react towards building energy demands, improve grids' resilience to fluctuations in renewable power supply and stochastic demands. Main functions of energy flexible buildings include avoiding excessive production, improving network stability, and addressing energy congestion. Energy interaction between 'building prosumers' and vehicles can improve eco-economic viability, renewable penetration, grid independence, coverage of both building and transportation demands, together with decreased environmental emissions. However, several technical challenges are proposed that need further investigation, including the building system design, cycling ageing of battery storages, energy congestion between renewable and flexible grid energy, the flexible micro-grids to energy supply fluctuations in multi-energy systems, and so on. In this study, a comprehensive and systematic research has been conducted for a carbon-neutrality district community with energy flexible buildings, smart grid response and advanced energy management. A general method was proposed to quantify energy flexibility of hybrid energy systems with diversified energy forms, advanced energy conversions and hybrid energy storages (cooling storage tanks, hot water storage tank, static batteries and integrated electric vehicle battery). Nonlinear component-based model on district energy community, integrating different types of building, building integrated photovoltaics, plug-in electric vehicles and micro-grid, was developed for the techno-economic and environmental analysis and energy flexibility evaluation. As a critical component to avoid the overestimation and underestimation on techno-economic performances, a dynamic battery cycling ageing model was developed within 'slow degradation' and 'acceleration' zones, respectively. Advanced grid-responsive energy control strategies have been proposed for grid electricity shifting, and a heuristic battery-protective strategy was adopted to improve the battery relative capacity. Results showed that, advanced energy management strategy can improve the renewable energy shifting ratio from off-peak to peak period from 86% to 96.8%. The proposed batteryprotective control strategy can improve the equivalent relative capacity from 0.94 to 0.986. Furthermore, the multi-objective optimisation will reduce the equivalent CO2 emission from 147.4 to 136.4 kg/m2.a, by 7.5%, and the import cost can be reduced from 212.7 to 194.6 HK$/m2.a, by 8.5%. District energy paradigm transition from the negative towards the positive can improve the net present value from -7.182×107 to 5.164×108 HK$. ageing The study demonstrates a general method to quantify and improve energy flexibility. Techno-economic performances on district buildings-vehicles systems are presented with the energy paradigm transition from the negative towards the positive, together with a series of solutions to improve techno-economic performances. The research results can provide technical guidance on energy planning of renewable and hybrid thermal/electrical systems, smart grid-responsive charging, and advanced energy management strategies, which are critical for realising the carbon-neutrality district community in subtropical regions.|
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