Study on the electricity spot market trading mechanism considering the proportion of renewable energy consumption quota.

This article focuses on the design and validation of a secondary clearing mechanism for China’s electricity spot market that integrates renewable energy consumption quotas while maintaining market fairness and system reliability. The proposed model introduces a price correction factor to adjust bids of curtailed renewable energy units during a secondary clearing stage, ensuring prioritized consumption to meet renewable energy quota requirements. It also incorporates a transmission safety margin into the clearing process to alleviate transmission congestion and reserve non-deliverability, thereby enhancing system security with minimal cost increase. Using a modified IEEE 30-bus system, the study demonstrates that the mechanism effectively reduces renewable energy curtailment, incentivizes conventional power units to relinquish generation capacity through a revenue-neutral compensation scheme, and improves overall market operation under high renewable penetration.