The integration of a high proportion of renewable energy (RE) brings serious challenges to the flexibility of supply-demand balance in the system. However

the current electricity market which is designed with thermal units as main subjects

ignores the significant difference in regulation capability between renewable energy resources (RESs) and traditional power sources

and fails to effectively reflect the regulation value provided by flexible resources. It results in the "hitchhiking" phenomenon of RESs. Hence

this paper designs quality-based RE markets

proposes the assessment method of RE curve quality based on correlation theory

and integrates the concept of RE curve quality into the transaction process and pricing mechanism for RESs

thereby achieving improvements to the current spot market based on locational marginal price (LMP) theory. This paper compares the difference in market clearing results between the quality-based and LMP-based energy markets

and analyzes the impacts of the high-quality energy market access coefficient and RE pricing coefficient on the market entities

and the influence of RE penetration rate on market clearing results. The results show that quality-based energy market is conducive to reducing the electricity costs for flexible resources

encouraging RESs to improve their energy curve quality

ensuring the recovery of the investment cost of the unit

and promoting the transformation of current power systems to carbon–neutral RE power systems.