Converter interface-oriented new energy grid-connected acceptance capability assessment method

By using static work angle constraints, static voltage constraints, reactive power compensation corrections and dynamic capacity increase in new energy systems, the grid-connected acceptance capabilities are evaluated, and the problem of failure to effectively consider the load capacity of the transmission channel in the existing technology is solved. Improved the level of new energy consumption and grid stability.

CN119227287APending Publication Date: 2024-12-31CONSTR BRANCH CHONGQING ELECTRIC POWER +1
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Patent Information

Application Number
CN202411584659.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-07
Publication Date
2024-12-31

AI Technical Summary

Technical Problem

When evaluating the grid-connected acceptance capability of a converter interface-type new energy system, the prior art fails to effectively consider the load capacity of the transmission channel, which may trigger static transmission instability and affect the stability of the power grid.

Method used

Multiple methods based on static work angle constraints, static voltage constraints, reactive power compensation corrections and dynamic capacity increase are adopted to determine the grid-connected acceptance capabilities to ensure the transmission capacity and grid stability of the new energy system.

Benefits of technology

It effectively improves the consumption level of new energy, ensures the continuous and stable operation of the power grid, avoids power grid fluctuations, and ensures the stability of the system after grid connection.

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Abstract

The invention provides a current transformer interface type new energy grid-connected acceptance capability assessment method. The method comprises the following steps: S1, obtaining parameters of a current transformer interface type new energy grid-connected system; s2, determining five types of grid-connected admitting abilities based on the parameters of the converter interface type new energy grid-connected system, the five types of grid-connected accepting capabilities comprise grid-connected accepting capability based on grid-connected static power angle stability constraint, grid-connected accepting capability based on grid-connected static voltage stability as constraint, reactive compensation grid-connected accepting capability, grid-connected transmission power with transformer dynamic thermal stability as boundary and grid-connected transmission power with power transmission line dynamic thermal stability as boundary; and S3, determining a reference condition during grid connection of the current converter interface type new energy grid-connected system, selecting the grid-connected acceptance capability corresponding to the reference condition from the five grid-connected acceptance capabilities, and taking the minimum value in the selected grid-connected acceptance capability as a final value for the converter interface type new energy grid-connected acceptance capability.
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