A method for controlling a power converter arrangement

The method decouples active and reactive power controls in power converters for renewable energy systems, enhancing grid support by minimizing interference and improving stability during disturbances.

WO2026153623A1PCT designated stage Publication Date: 2026-07-23VESTAS WIND SYSTEMS AS
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
VESTAS WIND SYSTEMS AS
Filing Date
2026-01-13
Publication Date
2026-07-23

AI Technical Summary

Technical Problem

Conventional solutions for controlling renewable electric power generating units as virtual synchronous machines (VSMs) fail to provide sufficient support to the electric power grid, leading to high mechanical loads during grid disturbances due to the inherent coupling between active and reactive power controls in power converters.

Method used

A method for controlling a power converter arrangement that decouples the control of active and reactive power by using grid-forming control, obtaining angle and voltage references, and producing contribution signals to minimize interference between these power controls.

Benefits of technology

This method improves the control of power converters, providing enhanced support to the electric power grid by reducing interference between active and reactive power controls, especially in weak grids, leading to more efficient and appropriate voltage support.

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Abstract

A method (400) for controlling a power converter arrangement (132) for electric power conversion between a renewable electric power generating unit (103) and an electric power grid (102). The method (400) comprises: controlling (400a) the active power (P) and reactive power (Q) supplied to the electric power grid (102) by a line-side converter (133b) by controlling (400b) the line-side converter (133b) according to a grid-forming control; according to the grid-forming control, obtaining (401) an angle reference (θ APC ); obtaining (402) a voltage reference (V RPC / VC ); at least based on the voltage reference (V RPC / VC ) and a varying grid-side voltage signal (V grid ), which represents a varying voltage on the grid-side of the line-side converter (133b), producing (403) an angle contribution signal (θ GFD ); adding (404) the angle contribution signal (θ GFD ) to the angle reference (θ APC ) so as to produce an output angle reference (θ ref ); and at least based on the output angle reference (θref), controlling (405) the active power (P) supply of the line-side converter (133b) to the electric power grid (102).
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