STATCOM与SVC在某钢铁企业的应用选择

根据静止同步补偿器(static synchronous compensator,简称STATCOM)和静止无功补偿装置(static var compensation,简称SVC)的基本工作原理和特性,对钢铁企业4 200 kW交—交变频同步电机改造工程中的电网无功补偿提出了两套设计方案。SVC设计方案采用TCR+FC静止型动态无功补偿装置,STATCOM设计方案采用±9 Mvar的STATCOM和9 Mvar无源FC构成混合动态无功补偿装置。并且在响应速度、谐波谐振的可能性、控制的鲁棒性、功耗、占地面积、价格比等方面进行了两套方案的比较。     

Exploration–Exploitation: How business analytics powers organisational ambidexterity for environmental sustainability

Simultaneous exploration and exploitation (i.e., exploration–exploitation) can help a firm address short-term environmental requirements and ensure long-term environmental viability. Exploration–exploitation, however, challenges organisational practices because they compete for resources and time. While business analytics (BA) offers the potential to overcome these challenges, research to date offers very limited insights into how BA capabilities interact with ambidextrous capabilities to realise environmental value. We address this issue by conducting a comparative case study at a bank and at a real-estate trust through the theoretical lens of dynamic capabilities. We develop a process model to explain how BA powers ambidextrous practices to achieve sustainability outcomes over time. We uncover two mechanisms: a BA-powered context shaping mechanism by which BA powers contextual ambidexterity at the employee level using data availability, timeliness, and analytics culture; and a BA-powered resource linking mechanism by which BA powers structural ambidexterity at intra- and inter-organisational levels using holistic insights and analytics leadership. Our model highlights the contextual factors that condition the extent to which a firm moves along the continuum of exploration–exploitation. We also define a new dimension of sustainability outcomes which we label eco-awareness to explain how BA shapes employees' environmental alertness and enables the paradigm shift in an organisation's sustainability mindset.     

六盘山地区静校正处理技术

六盘山区域因为地表条件复杂而使得解决该地区的静校正问题比较棘手.文中采用综合静校正方法,首先通过应用基于能量法的初至拾取方法拾取到准确的初至,然后应用层析静校正解决因为地形起伏和黄土沉积厚度变化而引起的较大量的静校正问题,进一步应用初至波剩余静校正解决反演模型与实际地表模型差异所造成的静校正问题,最后应用反射波剩余静校...     

中高压变频器冷却方案比较和选型分析

随着电力电子器件的发展,性能优异的中高压变频器在各行各业中得到越来越广泛的应用,能否处理好变频器的散热问题是其长期稳定运行的关键。分析了中高压变频器热量产生来源,并从技术可行性、可靠性、经济性等角度对不同冷却方案的特点进行比较,并结合实际的工程案例,给出合理的变频器冷却方案选型建议,可作为工程电气设计时中高压变频器冷却方案选型参考。