Objective  As one of the main sectors of carbon emissions, it is significant for the building sector to analyze the carbon emissions and the application potential of carbon reduction technologies, and plan carbon reduction paths, which will help to achieve the "3060" dual carbon goals in this sector and even in the country. The application of "photovoltaics, energy storage, direct current and flexibility" technology, one of the advanced low-carbon technologies in the building sector, can help the sector reduce carbon emissions and achieve carbon peak as soon as possible. However, most research in the field focuses on the emission calculation for individual buildings. There is currently a lack of comprehensive calculation and planning research on carbon emissions for the building complexes or the urban-level buildings, as well as the impacts of the carbon reduction technologies applied. This paper is to determine the carbon condition for each building sub-section and quantitatively analyse the carbon reduction potential of advanced technologies.

  Method  This research focused on carbon emissions research in the field of urban buildings with establishing the carbon emission calculation and trend prediction models and analyzing the impact of the application of "photovoltaics, energy storage, direct current and flexibility" technology on carbon emissions in the building sector. The contribution of this advanced technology could be quantified. Shenzhen City of South China had been chosen as a case study for carbon analysis.

  Result  The results show that the carbon emission of the building sector in the city is on the rise. The PEDF technology shows a great carbon reduction potential with 0.1407 million tons of reduction compared with the traditional rooftop photovoltaics.

  Conclusion  This model can be widely applied in the urban building carbon emission analysis and quantifying the impact of low-carbon technology, which can be of great significance for the construction planning of carbon-neutral cities. The relevant policies should not only strengthen the utilization of renewable energy but also emphasize its consumption, while promoting the application of the PEDF technology.