Carbon Emission Accounting Method Based on Power Flow Tracing Considering Green Electricity Trading

This paper proposes a carbon emission accounting (CEA) method based on power flow tracing that incorporates green electricity trading (GET). Renewable energy and loads participating in GET are connected via virtual green-power direct links, establishing virtual transmission lines within the power network. Two approaches - localized power flow change (LPFC) and power flow redistribution(PFR) - are then employed to calculate the carbon intensity of each transmission line and load after accounting for GET. An illustrative case study is conducted using a five-node system, and the characteristics of the two methods are analyzed from perspectives such as the CEA balance between generation and consumption, as well as the rationality of carbon emission responsibility allocation on the demand side. The results indicate that the accounting outcomes derived from LPFC exhibit greater rationality in carbon emission responsibility allocation.