Abstract: In order to further reasonably evaluate the transmission direction of green electricity in high-voltage transmission and distribution networks and accurately analyze the proportion of green electricity in user consumption, thereby providing persuasive data support for corporate electricity carbon emission verification, this paper proposes a research method for regional renewable energy transmission direction based on power grid flow topology analysis. This method simplifies the regional power grid model into a power flow topology network model,based on real-time power flow direction generator unit injection matrix, node flow matrix, and node load matrix. Furthermore, relying on a depth-first search algorithm, it traces all power transmission paths from green power sources to users and calculates the proportion of power diversion from green power sources to each user. This method has been validated for effectiveness and speed through the IEEE example system and actual regional grid frameworks. It can serve regional power grid companies and electricity users by precisely tracking the consumption of green power delivered to various types of loads.

    Key words: transmission direction; power flow topology analysis; depth-first search; green electricity