Method and control unit for operating a converter arrangement, converter arrangement and computer program

The method and control unit for grid-forming control on the grid-side manage torque changes and maintain DC link voltage stability, addressing grid instability and mechanical stress in wind turbines by adjusting control bandwidth and using a DC link voltage reference droop, ensuring safe and efficient operation.

WO2026119453A1 Publication Date: 2026-06-11ABB (SCHWEIZ) AG
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ABB (SCHWEIZ) AG
Filing Date
2025-10-15
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Grid instability and mechanical stress in wind turbines due to rapid torque changes in grid-forming control, which are not compatible with existing DC link voltage limits, necessitating a complete overhaul of generator control systems.

⚗Method used

A method and control unit that enable grid-forming control on the grid-side by modifying the DC link voltage reference based on synchronization power, allowing for stable grid interconnection and torque management within safety limits, using a DC link voltage reference droop and adjusting control bandwidth to maintain DC link voltage within safe ranges.

🎯Benefits of technology

Stabilizes the grid connection and maintains synchronism during transient states, reducing mechanical stress on wind turbines by smoothing torque changes and ensuring DC link voltage remains within safety limits, while minimizing changes to existing control loops.

✦ Generated by Eureka AI based on patent content.

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Abstract

A method for operating a converter arrangement (20) is provided. The converter arrangement has at least one electrical converter (22) electrically coupling a generator (26) to a grid (28) and a control unit (24) for operating the electrical converter (22). The method comprises: receiving an input vector (vcon, vpcc, iact) being representative of an electric power of the electrical converter (22); estimating a synchronization power value (ΔP) being representative of a synchronization power needed for synchronizing the electrical converter (22) to the grid (28); determining a generator power reference value (Pgen,ref) from the input vector (vcon, vpcc, iact) and the estimated synchronization power value (ΔP); generating a control signal (CS) for the electrical converter (22) depending on the determined generator power reference value (Pgen,ref); and sending the control signal (CS) to the electrical converter (22), wherein the control signal (CS) and the electrical converter (22) are configured such that the electrical converter (22) tries to generate the electric power corresponding to the generator power reference value (Pgen,ref).
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