| Large-scale development and utilization of clean energy and efficient utilization of existing energy have become the inevitable direction of energy structure adjustment.The large-scale development and utilization of renewable energy,such as solar energy,wind energy,geothermal energy,biomass energy,and the application of energy storage technology,promote buildings to lower energy consumption,and even achieve the goal of zero energy consumption building.However,the cost of traditional energy storage devices is high,and there is energy loss in the process of energy storage,which reduces the overall efficiency of the system.Virtual energy storage(VES)technology can improve these problems to some extent.In this paper,VES technology is applied to improve the energy supply and demand matching of building renewable energy system.VES optimization method based on load regulation is proposed.The VES system is constructed by utilizing the thermal storage characteristics of buildings.The VES function is realized by regulating the building load within the temperature comfort range.The simulation results show that VES can greatly reduce the storage capacity and cost,reduce the energy loss of energy storage links,and improve the matching and economy of system operation.Moreover,the combination of conventional energy storage and VES can achieve better energy storage effect.The conclusion has a certain guiding role for engineering design.The main contents and conclusions of this paper are as follows:(1)According to the dynamic heat balance of indoor air and the thermal inertia model of building envelope,a VES model is constructed.This paper establishes an office building model with a total floor area of 3600 m~2 under meteorological conditions in DeST,which simulates the hourly heat load in heating season under different temperature setting modes,and designs two load control strategies,"remodeling"dynamic load.Both the first load regulation and the second load regulation reflect the role of VES,which realizes the"peak shifting and valley filling"of the load curve,thus more matching with the energy supply curve.(2)Taking the renewable energy system of buildings as the research object,a solar photovoltaic photovoltaic thermal complementary thermoelectric cogeneration system is designed,which realizes the cascade and high-efficiency conversion of solar energy to electric energy and thermal energy.The solar heating efficiency and total efficiency reach 49%and 79%respectively.On this basis,the system adopts the VES method to actively regulate the building heat load and reduce the capacity of the heat storage device,which reduces the proportion of heat storage in typical days from 25.9%to 11.0%of the total building heat load;improves the matching degree between solar heating and building heat load,makes the proportion of the typical Japanese site energy supply to meet the load increase from 74%to 90%,and the local heating is self-sufficient.Consumption increased from 74%to 89%.(3)VES is applied to the renewable energy system of regional buildings to absorb wind power.The proposed VES-pre-heating strategy can absorb 626.81 MW of wind power on typical days,23.13 MW more than conventional operation mode,and VES-load reduction strategy can absorb 625.30 MW more than conventional operation mode on typical days,21.62 MW more than conventional operation mode.Finally,a hybrid energy storage system is constructed by combining conventional energy storage with VES.When the capacity of conventional energy storage devices reaches 90.08 MW,wind power generation is totally absorbed,the absorbed power is 728.16 MW,and the supplementary power is reduced to 0. |
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