统筹推进我国燃煤发电(简称“煤电”)转型升级,推动煤电功能定位转变,是实现“双碳”目标和加快构建新型电力系统的重要任务。针对我国燃煤发电转型升级的迫切需求,该文分析当前我国煤电的装机规模及其特点,评估了煤电的能耗、灵活性和...统筹推进我国燃煤发电(简称“煤电”)转型升级,推动煤电功能定位转变,是实现“双碳”目标和加快构建新型电力系统的重要任务。针对我国燃煤发电转型升级的迫切需求,该文分析当前我国煤电的装机规模及其特点,评估了煤电的能耗、灵活性和碳排放3方面的发展水平,解析我国煤电未来发展方向,重点探讨了煤电热力系统重构、煤电与储能融合、煤电与其他能源及碳捕集、利用与封存(carbon capture,utilization and storage,CCUS)的互补集成、“安全、高效、清洁、低碳、灵活”多目标协同4个方面的发展路径,提出新一代煤电高质量发展的基本思路。面向新形势下“安全、高效、清洁、低碳、灵活”的发展目标,未来我国煤电机组需要开展热力系统深度重构,通过热力系统的大范围重新设计、优化或改造,提高机组效率和灵活性、降低能耗和碳排放;可以将储热、飞轮、压缩空气等储能与煤电系统有机融合,突破煤电机组自身调节潜力约束,拓宽煤电机组的调节区间,提升机组变负荷能力和效率;充分利用煤电机组内丰富的物质流和能量流,可将煤电与其他能源或系统在多个环节匹配耦合,实现整体的多能互补能量梯级利用,提升总体能效与低碳水平;应重点从设计和运行两个维度实现多目标协同,在设计阶段注重高效清洁技术的集成与智能化、自动化,在运行过程中采用智能化、精细化控制策略。该文旨在增强煤电战略价值认知,为我国煤电转型升级提供理论参考和路径建议,助力新一代煤电在推进“双碳”进程和构建新型电力系统中发挥更广泛、更积极作用。展开更多
多园区综合能源微电网系统交互需要解决每个微电网之间的协调优化调度的问题,文中通过引入交互耦合功率变量解耦的方法,来求解园区内微电网之间交互的电功率,将集中求解的复杂问题转换为各微电网之间相互合作而且可以内部管理的优化问题...多园区综合能源微电网系统交互需要解决每个微电网之间的协调优化调度的问题,文中通过引入交互耦合功率变量解耦的方法,来求解园区内微电网之间交互的电功率,将集中求解的复杂问题转换为各微电网之间相互合作而且可以内部管理的优化问题,于是文中考虑采用同步式交替向乘子法(alternating direction method of multipliers,ADMM)分布式求解方法来实现各个园区微电网系统的成本关系分配,系统只需要求解分布式优化方案所需的信息,可以最大限度地降低运行成本,同时为了保证多园区微电网系统的低碳运行和降低环境成本,在考虑单个电热冷综合能源微电网系统的基础上,采用碳捕集设备和电转气装置以及配合阶梯碳交易机制的方法,更进一步降低系统碳排放;最后,通过仿真算例来验证所提方法和模型的有效性。展开更多
The supercritical CO_(2)(sCO_(2))power cycle could improve efficiencies for a wide range of thermal power plants.The sCO_(2)turbine generator plays an important role in the sCO_(2)power cycle by directly converting th...The supercritical CO_(2)(sCO_(2))power cycle could improve efficiencies for a wide range of thermal power plants.The sCO_(2)turbine generator plays an important role in the sCO_(2)power cycle by directly converting thermal energy into mechanical work and electric power.The operation of the generator encounters challenges,including high temperature,high pressure,high rotational speed,and other engineering problems,such as leakage.Experimental studies of sCO_(2)turbines are insufficient because of the significant difficulties in turbine manufacturing and system construction.Unlike most experimental investigations that primarily focus on 100 kW‐or MW‐scale power generation systems,we consider,for the first time,a small‐scale power generator using sCO_(2).A partial admission axial turbine was designed and manufactured with a rated rotational speed of 40,000 rpm,and a CO_(2)transcritical power cycle test loop was constructed to validate the performance of our manufactured generator.A resistant gas was proposed in the constructed turbine expander to solve the leakage issue.Both dynamic and steady performances were investigated.The results indicated that a peak electric power of 11.55 kW was achieved at 29,369 rpm.The maximum total efficiency of the turbo‐generator was 58.98%,which was affected by both the turbine rotational speed and pressure ratio,according to the proposed performance map.展开更多
文摘统筹推进我国燃煤发电(简称“煤电”)转型升级,推动煤电功能定位转变,是实现“双碳”目标和加快构建新型电力系统的重要任务。针对我国燃煤发电转型升级的迫切需求,该文分析当前我国煤电的装机规模及其特点,评估了煤电的能耗、灵活性和碳排放3方面的发展水平,解析我国煤电未来发展方向,重点探讨了煤电热力系统重构、煤电与储能融合、煤电与其他能源及碳捕集、利用与封存(carbon capture,utilization and storage,CCUS)的互补集成、“安全、高效、清洁、低碳、灵活”多目标协同4个方面的发展路径,提出新一代煤电高质量发展的基本思路。面向新形势下“安全、高效、清洁、低碳、灵活”的发展目标,未来我国煤电机组需要开展热力系统深度重构,通过热力系统的大范围重新设计、优化或改造,提高机组效率和灵活性、降低能耗和碳排放;可以将储热、飞轮、压缩空气等储能与煤电系统有机融合,突破煤电机组自身调节潜力约束,拓宽煤电机组的调节区间,提升机组变负荷能力和效率;充分利用煤电机组内丰富的物质流和能量流,可将煤电与其他能源或系统在多个环节匹配耦合,实现整体的多能互补能量梯级利用,提升总体能效与低碳水平;应重点从设计和运行两个维度实现多目标协同,在设计阶段注重高效清洁技术的集成与智能化、自动化,在运行过程中采用智能化、精细化控制策略。该文旨在增强煤电战略价值认知,为我国煤电转型升级提供理论参考和路径建议,助力新一代煤电在推进“双碳”进程和构建新型电力系统中发挥更广泛、更积极作用。
文摘多园区综合能源微电网系统交互需要解决每个微电网之间的协调优化调度的问题,文中通过引入交互耦合功率变量解耦的方法,来求解园区内微电网之间交互的电功率,将集中求解的复杂问题转换为各微电网之间相互合作而且可以内部管理的优化问题,于是文中考虑采用同步式交替向乘子法(alternating direction method of multipliers,ADMM)分布式求解方法来实现各个园区微电网系统的成本关系分配,系统只需要求解分布式优化方案所需的信息,可以最大限度地降低运行成本,同时为了保证多园区微电网系统的低碳运行和降低环境成本,在考虑单个电热冷综合能源微电网系统的基础上,采用碳捕集设备和电转气装置以及配合阶梯碳交易机制的方法,更进一步降低系统碳排放;最后,通过仿真算例来验证所提方法和模型的有效性。
基金National Science Fund for Excellent Young Scholars,Grant/Award Number:52022066。
文摘The supercritical CO_(2)(sCO_(2))power cycle could improve efficiencies for a wide range of thermal power plants.The sCO_(2)turbine generator plays an important role in the sCO_(2)power cycle by directly converting thermal energy into mechanical work and electric power.The operation of the generator encounters challenges,including high temperature,high pressure,high rotational speed,and other engineering problems,such as leakage.Experimental studies of sCO_(2)turbines are insufficient because of the significant difficulties in turbine manufacturing and system construction.Unlike most experimental investigations that primarily focus on 100 kW‐or MW‐scale power generation systems,we consider,for the first time,a small‐scale power generator using sCO_(2).A partial admission axial turbine was designed and manufactured with a rated rotational speed of 40,000 rpm,and a CO_(2)transcritical power cycle test loop was constructed to validate the performance of our manufactured generator.A resistant gas was proposed in the constructed turbine expander to solve the leakage issue.Both dynamic and steady performances were investigated.The results indicated that a peak electric power of 11.55 kW was achieved at 29,369 rpm.The maximum total efficiency of the turbo‐generator was 58.98%,which was affected by both the turbine rotational speed and pressure ratio,according to the proposed performance map.
