Generation Mix Optimization Considering Coal-Fired Units Retirement and Multi-type Clean Energy Units Investment

Under the carbon neutral goal, the power systems with high proportion of hydro generation will shut down a large number of coal-fired units during the low-carbon transition process. How to use clean energy to safely and reliable alternatives to achieve an orderly retirement of coal-fired power units is a key challenge faced by its carbon neutral transformation. Therefore, this paper proposes a generation mix optimization model that considering coal-fired units retirement and multi-type clean energy units investment, improving the economic benefits of the power system towards carbon neutral transformation while ensuring green and safety. Based on the IEEE RTS79 system, a case study analysis is carried out to compare and analyze the planning results from the perspectives of coal-fired unit retirement, transformation costs and carbon emissions, which verifies the effectiveness of the proposed model.