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电网电压不平衡下三相VSR的优化控制策略
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作者 杜翠静 常万仓 李占胜 《电气开关》 2012年第2期20-23,49,共4页
电网电压不平衡时,以电网平衡为约束所设计的三相电压型PWM整流器(VSR)会出现不正常的运行状态。其交流侧将产生负序电流,使网侧电流严重不对称。提出了基于同步旋转坐标系的三维复空间瞬时功率定义方法,适合于三相VSR不平衡控制和功率... 电网电压不平衡时,以电网平衡为约束所设计的三相电压型PWM整流器(VSR)会出现不正常的运行状态。其交流侧将产生负序电流,使网侧电流严重不对称。提出了基于同步旋转坐标系的三维复空间瞬时功率定义方法,适合于三相VSR不平衡控制和功率分析。同时在此基础上提出抑制交流侧负序电流的控制策略,最后进行了系统仿真。结果表明,该控制策略改善了三相VSR的网侧电流波形,实现三相VSR在电网不平衡下的正常运行。 展开更多
关键词 不平衡电网 三相VSR 三维复空间瞬时功率 负序电流
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New Interpretation of Newton’s Law of Universal Gravitation
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作者 Dalgerti L. Milanese 《Journal of High Energy Physics, Gravitation and Cosmology》 2017年第4期600-623,共24页
Elliptical motions of orbital bodies are treated here using Fourier series, Fortescue sequence components and Clarke’s instantaneous space vectors, quantities largely employed on electrical power systems analyses. Us... Elliptical motions of orbital bodies are treated here using Fourier series, Fortescue sequence components and Clarke’s instantaneous space vectors, quantities largely employed on electrical power systems analyses. Using this methodology, which evidences the analogy between orbital systems and autonomous second-order electrical systems, a new theory is presented in this article, in which it is demonstrated that Newton’s gravitational fields can also be treated as a composition of Hook’s elastic type fields, using the superposition principle. In fact, there is an identity between the equations of both laws. Furthermore, an energy analysis is conducted, and new concepts of power are introduced, which can help a better understanding of the physical mechanism of these quantities on both mechanical and electrical systems. The author believes that, as a practical consequence, elastic type gravitational fields can be artificially produced with modern engineering technologies, leading to possible satellites navigation techniques, with less dependency of external sources of energy and, even, new forms of energy sources for general purposes. This reinterpretation of orbital mechanics may also be complementary to conventional study, with implications for other theories such as relativistic, quantum, string theory and others. 展开更多
关键词 ORBITAL MOTIONS Gravity Newton’s Second Law Hook’s Elastic FORCES Fourier Electrical Circuits TRANSFORMATIONS of Fortescue and Clarke instantaneous space VECTORS instantaneous complex power
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