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The definition of reactive power for non-sinusoidal conditions is a controversial issue. The mathematical treatment of nonlinear loads in power systems is also unsettled. This paper starts with the decomposing of apparent power in,the cases of linear and nonlinear loads. When harmonics are present, apparent power is composed of active power, reactive power, and disturbed reactive power. Linear element can be defined as the element without disturbed reactive power. This definition is based on a practical engineering concept which can separate the contribution from the apparent power into utility-duty part and custom-duty part. The field investigation of home-used facilities was conducted. Also the data acquisition in the 0.4 kV distribution systems was completed. Moreover, the loss increase due to the nonlinear loads was estimated. Nonlinear loads can be a dominant effect with respect to reactive power and power factor. Field data from a number of nonlinear load types indicate that the disturbed reactive power can cause significant losses in utility supply systems. 相似文献
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本文论述基于核心素养构建高中政治高效课堂的做法,提出及时更新教育观念、转变传统教学模式、巧妙设计辩论活动、深入解析教材内容、紧密贴合社会生活、灵活设计课堂形式等六种途径,以提高高中政治教学效果,培养学生的政治核心素养。 相似文献
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《计算机网络》技术是飞速发展的计算机技术和通信技术结合的产物,《计算机网络》课程既有很强的理论性,又有很强的实践性,新技术发展迅速。在课程建设中,我们从教学内容、教学方法、实践性教学环节、考试制度建设等方面进行了改革与实践。 相似文献
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绿色转型是制造业高质量发展的必然要求,智能服务是促进其实现的重要支撑。从两业融合视角出发,构建智能服务与制造业融合评价指标体系,基于2011—2019年统计数据,分析智能服务融合对制造业绿色转型影响。研究发现:智能服务融合促进了制造业绿色转型,且表现为非线性“U型”关系;在不同维度中,产业规模影响居于首位,技术创新影响的提升速度超过其他维度;绿色转型效率时序分析结果表明,智能服务融合影响存在“数字化悖论”,产生原因在于技术效率与规模效率未形成协同;智能服务融合对污染型制造业绿色转型影响明显优于清洁型,对技术密集型制造业绿色转型作用效率最高。研究结果为我国制造业绿色转型提供了理论支撑和实践指导。 相似文献