Comparative analysis of the accuracy of several probabilistic power flow models

probabilistic currents;  mean;  variance;  Center moment

Based on the operation curves of nodal injection power and PV voltage, the differences in iterative calculation and calculation accuracy of several probabilistic power flow models are analyzed, including linearization model, approximate second-order model and complete second-order model. In various models, the correction of variance to mean is taken into account, and the extended Jacobi matrix is also used to consider the voltage curves of the PV point and the equilibrium point. The trial results show that the approximate second-order model that has attracted much attention for a long time cannot guarantee the accuracy of the real variance of voltage, while the voltage mean and variance calculated by the complete second-order model have quite high accuracy.