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。

From physical and mathematical points of view, this paper analyses the nature of instantaneous active and reactive power.

youdao

首先运用对称分量法将单相异步电动机分为正序系统和负序系统，然后分别用矩阵分析了这两个系统中各自的有功功率、无功功率和视在功率。

Using the method of symmetric components and matrix, this paper analyses instantaneous power and the operation parameters concerning one-phase asynchronous motor in dynamic state.

youdao

对于牵引网的单相性以及实现两臂负荷有功功率的流通，采用了改进型的单相补偿电流检测方法；

For the simple-phase feature of traction grid and the active power circulating between the two arms, an improved method of simple-phase compensating current detecting is used.

youdao