Multi-level carbon emission factor correction considering non-grid-connected electricity

doi:10.11930/j.issn.1004-9649.202509030

Abstract

Abstract:

Accurate carbon emission factors serve as the core basis for realizing the low-carbon transition of power systems. Currently, the average carbon emission factor of the power grid has coarse spatiotemporal granularity, while the carbon flow tracing methods struggle to meet computational requirements of massive nodes in actual complex power grids. Moreover, both overlook regional non-grid-connected electricity quantity. To address this, a multi-level regional carbon emission factor correction method considering non-grid-connected electricity quantity is proposed. Based on the electrical partitioning theory, this method constructs a solution framework for carbon emission factors and divides the actual power grid into three hierarchical structures (provincial-level, prefecture-level, and end-user level) from top to bottom according to voltage levels. A hierarchical and progressive strategy is adopted in the calculation of each level, ultimately attributing the environmental benefits of non-grid-connected electricity quantity to the corresponding nodes and dynamically correcting the carbon emission factors of grid-connected electricity quantity. Case studies at three levels (provincial, prefecture, and end-user) verify the feasibility of the method, achieving refined spatiotemporal granularity and fully accounting for the environmental benefits of distributed resources. It provides an engineering-practical technical pathway for carbon accounting of regional power systems.

Key words: carbon emission factor, grid-connected electricity quantity, non-grid-connected electricity quantity, correction calculation

CHENG Tao, YANG Fuli, SU Yu, CHEN Wenli, YANG Zhenhua, XIANG Yue. Multi-level carbon emission factor correction considering non-grid-connected electricity[J]. Electric Power, 2026, 59(3): 27-36.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202509030

https://www.electricpower.com.cn/EN/Y2026/V59/I3/27

Figures/Tables 10

Fig.1 Layered schematic of the power grid

Fig.2 System Topology

Fig.3 Generator carbon emission factor

Fig.4 Distribution of grid-connected vs. non-grid-connected electricity

Fig.5 Provincial node carbon emission factor

Fig.6 Prefecture-level node carbon emission factor

Table 1 Regional carbon emission factor

区域	负荷总量/(MW·h)	区域碳排放因子/(kg·(MW·h)^–1)
YB区	290	0.40
YZ区	195	0.97
JB区	155	0.56
BN区	155	0.92
NA区	50	1.10
IES	12	0.84

Fig.7 Corrected provincial-level node carbon emission factor considering non-grid-connected electricity

Fig.8 Comparison of carbon factors of some nodes before and after correction of non-grid-connected electricity

Fig.9 Influence of different non-grid-connected electricity quantities on node carbon emission factors

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