What needs to be developed from the concept of"Smart Grid"is that:when renewable energy sources are absolutely prevailing in power generation,distributed power generation and distributed energy storage syste...What needs to be developed from the concept of"Smart Grid"is that:when renewable energy sources are absolutely prevailing in power generation,distributed power generation and distributed energy storage systems are widespread across the grid,and electric vehicle charging loads are prevailing in power load demands,how can the power grid support electric power as a core secondary energy source,undertake the role of a bridge between primary energy and end-use energy,and achieve the coordination and the optimization in macro energy perspective;how to guarantee the security of both macro energy and environment as well as the reliability of electricity.If a new term is needed,it should be Comprehensive Energy Network,not Energy Internet.展开更多
This paper presents a method of tuning governor control parameters of an isolated hydropower generator considering the primary frequency performance and small-signal stability. First, generators that can be operated i...This paper presents a method of tuning governor control parameters of an isolated hydropower generator considering the primary frequency performance and small-signal stability. First, generators that can be operated in isolated state are identified. Second, different schemes are proposed for generator mode switching from on-grid to off-grid state through comparison and mechanism analysis. Third, the time domain model and frequency domain model of the isolated generator governor are constructed to respectively estimate the primary frequency performance and small signal stability. Parameter sets that satisfy the primary frequency performance and small signal stability are acquired as optimal values of governor control parameters. Finally, the measurement-based parameters of the governor are identified and validated using simulations to demonstrate the feasibility and effectiveness of the method.展开更多
压缩空气储能技术(compressed air energy storage,CAES)因其环境污染小、储能规模大、投资成本低等优势受到广泛关注,并向着高参数、大储能容量方向发展。然而,由于我国研究起步晚,大型CAES技术至今尚未投入商业化运行,对CAES动态特性...压缩空气储能技术(compressed air energy storage,CAES)因其环境污染小、储能规模大、投资成本低等优势受到广泛关注,并向着高参数、大储能容量方向发展。然而,由于我国研究起步晚,大型CAES技术至今尚未投入商业化运行,对CAES动态特性缺乏深入认识,严重阻碍了系统设计与调控技术的发展,限制了CAES的发展及普及。基于模块化建模思想及APROS平台,建立了先进压缩空气储能系统(advanced adiabatic compressed air energy storage,AA-CAES)的动态数学模型。分析该系统储能、释能阶段的动态特性;建立了并网调速系统控制模型,通过典型扰动下的响应分析,获得优化的控制策略。所建模型及研究结果为CAES动态特性的深入认识、系统设计和调控提供了有效的分析工具和数据参考,对推进AA-CAES的应用和普及具有实际意义。展开更多
基金This work is supported by National High Technology Research and Development Program of China(863 Program)(No.2011AA05A105)and SGCC Projects.
文摘What needs to be developed from the concept of"Smart Grid"is that:when renewable energy sources are absolutely prevailing in power generation,distributed power generation and distributed energy storage systems are widespread across the grid,and electric vehicle charging loads are prevailing in power load demands,how can the power grid support electric power as a core secondary energy source,undertake the role of a bridge between primary energy and end-use energy,and achieve the coordination and the optimization in macro energy perspective;how to guarantee the security of both macro energy and environment as well as the reliability of electricity.If a new term is needed,it should be Comprehensive Energy Network,not Energy Internet.
基金supported by the Fujian Provincial Government Project (Title: Research on whole process evaluation of dynamic stability and control strategy in condition of grid connection of ultra-high voltage and large scale penetration of nuclear power.No.2015H0023)the State Grid Science & Technology Project (Title: Research on the improvement on stability of primary frequency of generator in account of the tolerance of equipment.No.52130417002P)the Key project of State Grid Fujian Electric Power Company,Ltd (research on key technologies of primary frequency power oscillation mechanism analysis and inhibition measures in large-scale unit in Fujian power grid.No.52130417000J)
文摘This paper presents a method of tuning governor control parameters of an isolated hydropower generator considering the primary frequency performance and small-signal stability. First, generators that can be operated in isolated state are identified. Second, different schemes are proposed for generator mode switching from on-grid to off-grid state through comparison and mechanism analysis. Third, the time domain model and frequency domain model of the isolated generator governor are constructed to respectively estimate the primary frequency performance and small signal stability. Parameter sets that satisfy the primary frequency performance and small signal stability are acquired as optimal values of governor control parameters. Finally, the measurement-based parameters of the governor are identified and validated using simulations to demonstrate the feasibility and effectiveness of the method.
文摘压缩空气储能技术(compressed air energy storage,CAES)因其环境污染小、储能规模大、投资成本低等优势受到广泛关注,并向着高参数、大储能容量方向发展。然而,由于我国研究起步晚,大型CAES技术至今尚未投入商业化运行,对CAES动态特性缺乏深入认识,严重阻碍了系统设计与调控技术的发展,限制了CAES的发展及普及。基于模块化建模思想及APROS平台,建立了先进压缩空气储能系统(advanced adiabatic compressed air energy storage,AA-CAES)的动态数学模型。分析该系统储能、释能阶段的动态特性;建立了并网调速系统控制模型,通过典型扰动下的响应分析,获得优化的控制策略。所建模型及研究结果为CAES动态特性的深入认识、系统设计和调控提供了有效的分析工具和数据参考,对推进AA-CAES的应用和普及具有实际意义。
