Research On Comprehensive Benefit Evaluation Of Photovoltaic Building System

Solar energy has received more and more attention due to its inexhaustible and non-polluting characteristics.In particular,solar photovoltaic power generation is considered the best green power generation method.The output of the solar battery is direct current,and it is directly related to the size of the load and the light intensity,so it cannot be used directly as a regular direct current power source.The DC-DC converter can convert the direct current output by the solar cell into a stable direct current output of different voltages.In the photovoltaic building system,the integration of excess photovoltaic power into a small grid-connected photovoltaic power generation system suitable for residential use and the realization of photovoltaic maximum power point tracking(MPPT)require a DC-DC converter.In addition,in the existing photovoltaic building system,photovoltaic panels are mainly used to realize the self-supply of electricity,and the energy demand for cold and heat has not been discussed in depth.In order to better promote the use of photovoltaic buildings in the future,and promote the development of clean energy and urban and rural buildings,the main tasks of this article are as follows:(1)A new type of DC-DC topology is designed,and the stability is improved when the components are reduced.At the same time,a frequency and phase-shift synthesis modulation(FPSSM)strategy control strategy is proposed.By controlling the charging time of the capacitor,the automatic energy control of the capacitor based on the input current can be realized without additional switches or auxiliary circuits,which solves the problem of low efficiency of the traditional control strategy.Compared with the traditional converter,the correctness and superiority of the theory are verified by simulation and experiment.(2)Consider the combination of photovoltaics and buildings to improve energy utilization,analyze the two-way interaction between buildings and local energy networks,and use photovoltaic panels(PV,PV/TC),batteries,heat pumps,thermal storage and electric heating networks to form an energy system.The two-layer optimization algorithm is used to evaluate the impact of energy system coupling on the independent economy of building energy,and the operation of the building system under four scenarios is analyzed.The upper layer is configuration optimization,through the multi-objective particle swarm algorithm,the Pareto frontier solution of the multi-objective optimization model that comprehensively considers economic benefits,social benefits,and environmental benefits is obtained;the lower layer is operation optimization,with the goal of minimizing daily operating costs to obtain the output of the system.(3)Taking the photovoltaic building in the smart eco-city of Tianjin Binhai New Area as an example,the construction principle of photovoltaic building is introduced,and the energy consumption and the investment payback period under the life cycle are analyzed.At the same time,it introduces the technology of power Internet of Things and the realization of intelligent terminal interaction,remote control and online monitoring of equipment through the power of Internet of Things technology.Provide a good reference for the efficient use of energy,improve the comprehensive level of buildings,and promote the application of photovoltaic buildings.