Research On Wind Power Absorption And Electric Heat Dispatch Under The Flexibility Adjustment Of Steam Turbine

In 2020,China made a commitment internationally to achieve "peak carbon dioxide emissions" before 2030 and to achieve "carbon neutrality" by 2060.Wind power,which has broad prospects in low-carbon electricity generation,significantly reduces its impact on the environment compared to fossil fuel-based power generation.However,during the winter heating season in the "Three North" regions of China,the operation of combined heat and power units poses challenges for power regulation,and the intermittent nature of wind power can lead to significant wind curtailment issues.Decoupling heat and power generation can enhance the flexibility of the power grid and effectively accommodate excess wind power.This paper addresses the wind curtailment issue in the "Three North" regions and proposes a solution using the flexibility of steam turbines to accommodate wind power and manage electric and thermal scheduling.The paper develops models for steam turbine configuration with thermal storage tanks,bypass compensation heating,and low-pressure cylinder cutoff.It also incorporates heat pumps and considers carbon trading mechanisms to obtain optimal low-carbon economic dispatch results.Firstly,based on carbon trading mechanisms and thermal storage technology,a scheduling scheme combining steam turbine configuration with thermal storage tanks and heat pumps is proposed.By establishing models for thermal storage tanks and heat pumps and considering carbon trading mechanisms,the paper investigates the impact of different steam turbine configurations and operating modes on electric and thermal scheduling and carbon emissions.Three schemes are designed and compared to explore the economic efficiency and wind power accommodation capacity of the system under different operating schemes.The paper discusses the hourly variation of thermal storage capacity and analyzes the influence of heat pump operation characteristics on the scheduling system.The results of the case study show that the proposed operating scheme improves wind power accommodation capacity by 24.6% compared to the original scheme,achieving optimal operational economy.Secondly,the paper explores wind power accommodation and electric and thermal scheduling using the scheme of steam turbine bypass compensation heating.The proposed solution combines steam turbine bypass compensation heating with heat pumps.By establishing a model to calculate coal consumption for bypass heating and analyzing the impact of using bypass heating during nighttime wind power peaks on coal consumption and wind curtailment,the paper conducts an analysis of the electric and thermal operation characteristics of the cogeneration units.The results of the case study show that this scheme can achieve decoupling of heat and power,obtaining optimal low-carbon economic allocation of electricity and heat.The thermal and electric operation characteristics of the cogeneration unit with steam turbine bypass and heat pumps perform the best,increasing wind power accommodation rate by 25% and reducing overall system expenses by 689,000 yuan.Lastly,the paper explores wind power accommodation and electric and thermal scheduling using the scheme of steam turbine low-pressure cylinder cutoff.The proposed solution introduces heat pumps for heat and power decoupling based on steam turbine low-pressure cylinder cutoff.A thermodynamic model for the steam turbine after low-pressure cylinder cutoff is established using thermodynamic analysis.The results of the case study show that this scheme can achieve optimal wind power accommodation rate of 99.2% while meeting the heat load,accomplish heat and power decoupling,and reduce coal consumption and carbon emissions.Additionally,it ensures the reliability of the power system and achieves optimal low-carbon economic dispatch.The three proposed schemes effectively accommodate wind power and manage electric and thermal scheduling,achieving optimal economic and environmental benefits.The research findings of this paper can provide reference and guidance for wind power accommodation and electric and thermal scheduling,as well as offer theoretical and practical insights for addressing similar issues in the future.The study holds significant value for both theoretical research and practical applications.