非正弦及不对称电路中功率现象的探讨

Approach of Power Phenomenon in Nonsinusoidal Circuit and Asymmetrical Circuit

从物理和数学的角度 ,对单相电路、三相电路瞬时有功功率和瞬时无功功率的概念进行了剖析。本文提出 ,瞬时有功功率和瞬时无功功率并不是绝对的 ,瞬时有功功率应该是对应于某一目的的理想功率流动 ,即使对于同一电路 ,瞬时有功和瞬时无功的结果也应随着分析者的目的的不同而不同。本文同时提出 ,三相三线电路的无功流动不仅存在于各相之间 ,而且也可能存在于电源与负载之间。最后 。

From physical and mathematical points of view,this paper analyses the nature of instantaneous active and reactive power.It points out that,as invented measurements,instantaneous active and reactive power should not take absolute forms.Instantaneous active power should represent ideal power distribution;its results may be variable because the 'ideal' may be variable.In three-wire-three-phase circuit,instantaneous reactive power flows not only between different phases ,but also between the three-phase source and the three-phase load.The paper presents two examples,by which the theory mentioned above is confirmed.