computation is also large when using the conventional
convolution algorithm [5] or Fast Fourier decomposition
algorithm etc [6]. The semi-invariant [7-9] can independently
transform random variables convolution into simple addition
and improve the calculation efficiency. This paper uses
semi-invariant comprehensively considering random factors
to calculate probabilistic load flow. Finally, we test the
feasibility and superiority of this method in the IEEE30 bus
system.