Steady-state operation control method for offshore direct-current wind turbine generator

By adding a lead-lag element to the power control stage of the generator-side converter of the offshore DC wind turbine, and combining it with the inner loop control of DC and AC voltages, coordinated control between the offshore DC wind turbine and the offshore centralized booster station is achieved. This solves the stability problem of the system during startup and power transmission, and ensures the safe and stable operation of the system.

CN121965536APending Publication Date: 2026-05-01TIANJIN UNIV
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Patent Information

Application Number
CN202610150691.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-03
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing technologies lack effective control methods, making it difficult to coordinate the control of offshore DC wind turbines and offshore centralized booster stations. This results in the system being difficult to maintain stability during startup and power transmission, especially when wind speed fluctuates, power output is prone to oscillation.

Method used

A coordinated control architecture that includes two stages, startup and power transmission, is adopted. By adding a lead-lag element to the power control stage of the turbine-side converter of the offshore DC wind turbine, and combining the inner loop control of DC voltage and AC voltage, the smooth switching and coordinated operation of the offshore DC wind turbine and the offshore centralized booster station can be achieved.

Benefits of technology

Ensure that the system can stably establish a medium-voltage DC collection voltage during the startup phase, and maintain stable power output of the wind turbine even when facing wind speed fluctuations during the power transmission phase, suppressing oscillations and ensuring the safety and stability of the system throughout the entire process from startup to steady-state operation.

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Abstract

The invention discloses a steady-state operation control method for an offshore direct-current wind turbine generator. The method comprises the steps that in the first stage, medium-voltage direct-current collection voltage is established and maintained through an offshore direct-current wind turbine generator; and in the second stage, after the offshore centralized booster station is started and takes over the control of the medium-voltage direct-current collection voltage, the offshore direct-current wind turbine generator set is switched to a power output mode, and a lead-lag link is added to a power control link of the machine-side converter, so that the power output is stable. According to the method, the problem of coordination control between the offshore direct-current wind turbine generator and the centralized booster station adopting diode uncontrolled rectification is solved, and stable operation of the system under starting and wind speed fluctuation is realized through two-stage coordination and additional control links.
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