Study On Energy Supply System Planning Of Zero Energy Buildings Supported By Hydrogen Energy

Zero energy building is one of the effective ways to achieve "carbon neutrality",and the clean substitution of building terminal energy is the inevitable trend of future development.With the innovation of the current society technology energy paradigm,the construction field has to undertake higher energy-saving requirements and social responsibilities,not only to reduce its own energy consumption,but also to innovate and develop renewable energy technologies to provide energy for itself.In this paper,the basic structure and operation strategy of zero energy consumption building energy supply system supported by hydrogen energy are put forward,and the multi-objective planning method of energy supply system is discussed considering the building area and life cycle economy.The specific research contents of this paper include:Around the design requirements of zero energy buildings,the meaning and characteristics of "energy supply system of zero energy consumption buildings" are defined.The structure of energy supply system supported by hydrogen energy in typical application scenarios is described,and the operation strategy including 12 working modes is formulated.Based on the structure of the energy supply system,the internal rate of return is taken as the evaluation index.In case of continuous extreme weather without wind and rain output,the energy supply system supported by hydrogen energy is compared with the two energy supply modes of energy storage battery and energy storage battery & diesel engine,and the conclusion is obtained: under extreme climate conditions,with the increase of capacity power ratio of energy supply system,the advantage of low cost of hydrogen energy capacity gradually appears.And its internal rate of return surpasses the other two energy supply modes after the capacity power ratio reaches 13 times.The economic advantage of hydrogen energy as long-term energy storage is verified.In view of the project investment status of "production profit,operation and maintenance loss" and "affordable,not affordable".Based on the life cycle time value of energy supply system,a life cycle cost model considering preventive maintenance cost is established.Adopting the improved entropy weight hierarchy method to construct the preventive maintenance strategy of energy supply system equipment in zero energy consumption buildings.According to the operation and maintenance characteristics and actual working conditions of the energy supply system,multi-layer preventive maintenance evaluation indexes are divided.Combined with the quantitative data of maintenance economy,equipment importance,fault hazard and other indexes in the actual scene of the equipment,a more scientific and reasonable maintenance cycle is determined,the phenomenon of over maintenance and under maintenance is reduced,and the difference of maintenance costs derived from different systems is accurate.The whole life cycle cost of energy supply system equipment in zero energy consumption buildings with more theoretical basis is obtained.For different application scenarios of zero energy buildings,the matching between the construction area required by the energy supply system and the actual conditions is one of the important topics of system planning.Therefore,the NSGA-Ⅱ multi-objective programming model is established,which takes the minimum life cycle cost and the minimum construction area as the optimization objective,takes the capacity of energy supply equipment as the decision variable,and considers the constraints such as power balance,upper and lower limits of output,hydrogen storage,load power shortage rate and sustainable development of new energy.TOPSIS method is used to screen the optimal scheme under different planning preferences in Pareto solution set.An example of a residential building in Northwest China is analyzed to verify the feasibility and rationality of the planning model and method.In addition,the sensitivity analysis of the negative externality policy of abandoning new energy punishment is adopted to verify the positive guiding and promoting effect of the policy on users’ energy consumption habits.