Big data analytics has been widely adopted by large companies to achieve measurable benefits including increased profitability,customer demand forecasting,cheaper development of products,and improved stock control.Sma...Big data analytics has been widely adopted by large companies to achieve measurable benefits including increased profitability,customer demand forecasting,cheaper development of products,and improved stock control.Small and medium sized enterprises(SMEs)are the backbone of the global economy,comprising of 90%of businesses worldwide.However,only 10%SMEs have adopted big data analytics despite the competitive advantage they could achieve.Previous research has analysed the barriers to adoption and a strategic framework has been developed to help SMEs adopt big data analytics.The framework was converted into a scoring tool which has been applied to multiple case studies of SMEs in the UK.This paper documents the process of evaluating the framework based on the structured feedback from a focus group composed of experienced practitioners.The results of the evaluation are presented with a discussion on the results,and the paper concludes with recommendations to improve the scoring tool based on the proposed framework.The research demonstrates that this positioning tool is beneficial for SMEs to achieve competitive advantages by increasing the application of business intelligence and big data analytics.展开更多
为实现超导储能装置(SMES-Superconducting Magnetic Energy Storage)与输配电网之间的协调作用,达到提高电网输送容量、暂态稳定性和电压稳定性,提高配电网电能质量的目的。根据SMES的结构特点,结合目前大功率电力电子器件以及电路拓...为实现超导储能装置(SMES-Superconducting Magnetic Energy Storage)与输配电网之间的协调作用,达到提高电网输送容量、暂态稳定性和电压稳定性,提高配电网电能质量的目的。根据SMES的结构特点,结合目前大功率电力电子器件以及电路拓扑的发展趋势,设计了一台三单相H桥分立控制的电压型换流器(VSI-Voltage source inverter)及其控制系统平台。该电压型换流器采用三相器件独立运行结构,控制系统采用数字信号处理器(DSP-Digital Signal Processing)设计,在功能上实现了对串联于电力线路的注入电压幅值和相位的灵活控制,最后给出了一台20 kW电压型换流器原理样机对母线电压补偿功能的试验结果,试验结果表明,该电压型换流器可以满足超导储能系统的需要。展开更多
为实现超导磁储能装置(superconducting magnetic energy storage,SMES)对电力系统功率的准确跟踪与快速补偿,并有效抑制系统的功率振荡,首先分析了包含SMES的单机系统的功角特性,基于系统的能量函数,以提高系统阻尼为目标,提出了以SME...为实现超导磁储能装置(superconducting magnetic energy storage,SMES)对电力系统功率的准确跟踪与快速补偿,并有效抑制系统的功率振荡,首先分析了包含SMES的单机系统的功角特性,基于系统的能量函数,以提高系统阻尼为目标,提出了以SMES接入点电压及其变化率为控制变量的导纳控制方法数学模型。与传统的以接入点电压幅值或相角做控制变量的控制方法不同,导纳控制方法不仅与接入点电压幅值有关,还与其变化速度有关,因而可提高SMES响应的灵敏度和精度。最后,通过算例验证了SMES抑制单机无穷大系统功率振荡的效果,结果表明该控制方法不仅可以有效抑制功率振荡,而且能使系统迅速恢复稳定状态,从而能提高电力系统的运行稳定性。展开更多
针对用于超导磁储能SMES(Superconducting Magnets Energy Storage)的变流器监控需要,设计了具有人机交互功能的可视化监控系统。该系统基于微控制器(MCU)+数字信号处理(DSP)双处理器的形式,使用C8051F020单片机作为监控系统主处理器,实...针对用于超导磁储能SMES(Superconducting Magnets Energy Storage)的变流器监控需要,设计了具有人机交互功能的可视化监控系统。该系统基于微控制器(MCU)+数字信号处理(DSP)双处理器的形式,使用C8051F020单片机作为监控系统主处理器,实现SMES变流器监控系统液晶终端的监控参数显示和人机交互界面;采用TMS320F2812芯片作为DSP控制处理器,用于实时数据采集、数据处理和变流器功率模块开关管控制。对SMES变流器监控系统的工作原理、硬件接口电路、软件程序设计进行了研究。采用该监控系统,通过传感器、DSP、单片机实时采集和处理各监控量的运行参数判断变流器的运行状态,可将各监控量在液晶终端上实时显示,同时DSP接收液晶终端的控制命令,从而控制变流器的运行状态。实验测试结果表明设计的SMES变流器监控系统可以实现对变流器系统运行状态的实时可靠监控。展开更多
文摘Big data analytics has been widely adopted by large companies to achieve measurable benefits including increased profitability,customer demand forecasting,cheaper development of products,and improved stock control.Small and medium sized enterprises(SMEs)are the backbone of the global economy,comprising of 90%of businesses worldwide.However,only 10%SMEs have adopted big data analytics despite the competitive advantage they could achieve.Previous research has analysed the barriers to adoption and a strategic framework has been developed to help SMEs adopt big data analytics.The framework was converted into a scoring tool which has been applied to multiple case studies of SMEs in the UK.This paper documents the process of evaluating the framework based on the structured feedback from a focus group composed of experienced practitioners.The results of the evaluation are presented with a discussion on the results,and the paper concludes with recommendations to improve the scoring tool based on the proposed framework.The research demonstrates that this positioning tool is beneficial for SMEs to achieve competitive advantages by increasing the application of business intelligence and big data analytics.
文摘为实现超导储能装置(SMES-Superconducting Magnetic Energy Storage)与输配电网之间的协调作用,达到提高电网输送容量、暂态稳定性和电压稳定性,提高配电网电能质量的目的。根据SMES的结构特点,结合目前大功率电力电子器件以及电路拓扑的发展趋势,设计了一台三单相H桥分立控制的电压型换流器(VSI-Voltage source inverter)及其控制系统平台。该电压型换流器采用三相器件独立运行结构,控制系统采用数字信号处理器(DSP-Digital Signal Processing)设计,在功能上实现了对串联于电力线路的注入电压幅值和相位的灵活控制,最后给出了一台20 kW电压型换流器原理样机对母线电压补偿功能的试验结果,试验结果表明,该电压型换流器可以满足超导储能系统的需要。
文摘为实现超导磁储能装置(superconducting magnetic energy storage,SMES)对电力系统功率的准确跟踪与快速补偿,并有效抑制系统的功率振荡,首先分析了包含SMES的单机系统的功角特性,基于系统的能量函数,以提高系统阻尼为目标,提出了以SMES接入点电压及其变化率为控制变量的导纳控制方法数学模型。与传统的以接入点电压幅值或相角做控制变量的控制方法不同,导纳控制方法不仅与接入点电压幅值有关,还与其变化速度有关,因而可提高SMES响应的灵敏度和精度。最后,通过算例验证了SMES抑制单机无穷大系统功率振荡的效果,结果表明该控制方法不仅可以有效抑制功率振荡,而且能使系统迅速恢复稳定状态,从而能提高电力系统的运行稳定性。
文摘针对用于超导磁储能SMES(Superconducting Magnets Energy Storage)的变流器监控需要,设计了具有人机交互功能的可视化监控系统。该系统基于微控制器(MCU)+数字信号处理(DSP)双处理器的形式,使用C8051F020单片机作为监控系统主处理器,实现SMES变流器监控系统液晶终端的监控参数显示和人机交互界面;采用TMS320F2812芯片作为DSP控制处理器,用于实时数据采集、数据处理和变流器功率模块开关管控制。对SMES变流器监控系统的工作原理、硬件接口电路、软件程序设计进行了研究。采用该监控系统,通过传感器、DSP、单片机实时采集和处理各监控量的运行参数判断变流器的运行状态,可将各监控量在液晶终端上实时显示,同时DSP接收液晶终端的控制命令,从而控制变流器的运行状态。实验测试结果表明设计的SMES变流器监控系统可以实现对变流器系统运行状态的实时可靠监控。
