Probabilistic load flow calculation method and device for AC/DC hybrid power grid and medium

Abstract

The invention discloses a probabilistic load flow calculation method for an AC / DC hybrid power grid. The method comprises the steps of obtaining the historical data of random variables in the AC / DC hybrid power grid; according to the historical data of the random variables, based on a nine-order polynomial normal transformation method, calculating to obtain random variables which have correlationand obey arbitrary distribution so as to construct an input random variable probability model of the AC / DC hybrid power grid; and transmitting probability information in the deterministic AC / DC hybridpower grid load flow calculation model by utilizing a Latin hypercube sampling method based on a Monte Carlo simulation method so as to obtain a probability load flow calculation result of the AC / DChybrid power grid. The invention further discloses a corresponding device and a medium, by adopting the embodiment of the invention, the scene that random variables obey arbitrary distribution, and correlation exists between the distribution, can be accurately simulated, and the calculation speed of the probabilistic load flow algorithm can be considered.

Description

technical field [0001] The invention relates to the field of power system power flow calculation, in particular to a probabilistic power flow calculation method, device and medium for an AC / DC hybrid power grid. Background technique [0002] In the future, a large number of offshore wind farms in offshore deep water areas will use multi-terminal DC systems based on voltage source converters to connect to the AC backbone network. As we all know, wind power output has strong fluctuations and uncertainties, and large-scale offshore wind power grid integration will bring severe challenges to the safe operation of AC-DC hybrid power grids. Therefore, it is of great practical significance to study the probabilistic power flow calculation (Probabilistic Power Flow, PPF) of AC / DC hybrid grid. [0003] The random variables (such as wind power output, load, etc.) in the AC / DC hybrid power grid are affected by various complex factors such as meteorological factors and geographical env...

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Problems solved by technology

[0004] However, in the process of implementing the present invention, the inventors found that the prior art has at least the following problems: the third-order polynomial normal transformation (TPNT) and the fifth-order polynomial normal transformation (FPNT) technologies proposed in the prior art are used when dealing with AC and DC When the random variables in the hybrid power grid, such as wind speed and load obey extremely irregular distribution, the accuracy is still not ideal; if a higher-order polynomial normal transformation is used to establish the power grid input probability model, the calculation speed of the probabilistic power flow algorithm cannot be guaranteed at the same time

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