Green electricity trading driven low-carbon sharing for interconnected microgrids

Abstract

Green electricity becomes an inevitable trend to reduce carbon emissions. However, green certificate issuance based on power generation amounts restricts microgrids to participate in regional green electricity trading. In this context, a green electricity trading-driven low-carbon sharing approach for interconnected microgrids (IMG) is proposed. First, a new green electricity peer-to-peer (P2P) trading mechanism for regional IMG is proposed, where the energy sharing profile of each microgrid (MG) can be flexibly managed based on the interest. And the Nash equilibrium theory based on a non-cooperative game is applied to determine the trading capacity. Second, we define the green electricity value generated by P2P trading of renewable energy among IMG systems, where the green electricity value includes the value of traded green electricity, reduced carbon emission cost, and renewable energy subsidies. Especially, environmentally friendly factors are proposed to allocate the green electricity value between the buyer and seller, which can guide MGs to improve their energy composition and reduce carbon emissions. Third, a decentralized energy management approach is introduced to coordinate energy transactions among IMG systems based on the alternating direction method of multipliers (ADMM). The simulation analysis shows that the green electricity trading mechanism can reduce energy costs, carbon emissions and promote the consumption of green electricity.