Global real-time simulation method for AC/DC hybrid power grid based on digital twin technology

Abstract

The invention discloses a real-time simulation method for the AC / DC hybrid power grid based on digital twin technology. First, the original data of the power grid is collected, and the original data of the power grid is preprocessed by using a time series data cleaning method, and then based on the Gaussian distribution function and unary The combined piecewise function of linear functions simulates and predicts the output characteristics of wind power, simulates the output characteristics of photovoltaic power plants based on the normal distribution function, and then establishes the AC / DC hybrid power grid twin model by equating the sub-module power electronic switch to its on-resistance. Under the premise of not reducing the accuracy of model calculation, the present invention improves the efficiency of microsecond-level modeling and analysis of AC-DC hybrid power grids by equating the power electronic switch of the sub-module to its on-resistance; establishes a set of high The adaptive new energy modeling method is applicable to different fields and geographical environments, which improves the convenience of new energy output prediction and improves the efficiency of model operation.

Description

technical field [0001] The invention relates to the technical field of power system simulation modeling, in particular to a full-domain real-time simulation method for an AC / DC hybrid power grid based on digital twin technology. Background technique [0002] 1) Digital twin technology [0003] Digital Twin (Digital Twin, DT) was first proposed by American scholar Michael Grieves, and it was applied in the field of aerospace. It was adopted by NASA and AFRL in 2010 and 2011 respectively. This technology maps real-time actions, behaviors and states of entities by mining and analyzing a large amount of real-time and historical data. The virtual model of the aircraft established by this technology realizes the synchronization of virtual and reality through sensor technology, which is conducive to timely understanding of the target's operation status, health status, load capacity and other data, which greatly enhances the effectiveness of decision-making. At present, this techn...

AI Technical Summary

Problems solved by technology

After the new energy units are connected to the grid on a large scale, there will be frequency changes in the grid, which will bring hidden dangers to the safe and stable operation of the grid

After research, it is found that the power fluctuation of new energy units at 0.01-1.0Hz has the greatest impact on the power system, which is not conducive to the normal operation of the power system

[0021] ⑶ Impact on grid harmonics The operation of new energy power stations will be affected by itself and the outside world, and voltage and current harmonics are prone to appear, which affects the power quality of the grid

[0022] ⑷ Impact on grid operation Interaction between new energy and conventional energy will affect grid stability

[0027] In addition, because the normal operation of the power system requires the cooperation of personnel from multiple disciplines and departments, the analysis of the AC / DC hybrid transmission system is relatively scattered, and it is usually necessary to build a local targeted model for a certain research focus. , has not formed a complete set of digital twin analysis system and architecture, which is not conducive to the integration of information, and cannot carry out comprehensive control over the entire life cycle of assets and their operating status

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