Instantaneous power definition
Instantaneous power refers to the power that a circuit absorbs in an instant in physics. Its magnitude is equal to the product of the instantaneous value of the instantaneous voltage and current. The instantaneous power is drawn because the voltage and current waveforms are distorted relative to the standard sine wave due to non-linear loads in the power system. The traditional theory of harmonics separates voltage and current by Fourier orthogonal decomposition, which is not only difficult to see whether the linear relationship between voltage and current is good, but because there are active and reactive components corresponding to each harmonic voltage However, these components cannot be simply superimposed into total active and reactive power, which causes the complexity of power analysis.