Open Access

ARTICLE

A Phased Active Frequency Support Strategy Tailored for Wind Power HVDC Transmission Systems

Guoqing Li, Jian Lou, Shouqi Jiang^*, Yechun Xin, Yanxu Wang, Tuo Wang
The Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin, 132012, China
* Corresponding Author: Shouqi Jiang. Email:

Energy Engineering https://doi.org/10.32604/ee.2025.074947

Received 22 October 2025; Accepted 08 December 2025; Published online 23 December 2025

Abstract

To mitigate the frequency stability challenges arising from insufficient system inertia and inadequate damping capacity, a phased active frequency support control strategy for the sending-end grid with collaborative participation of wind power and modular multilevel converter-based high-voltage direct current (MMC-HVDC) is proposed, which realizes flexible mutual support and efficient utilization of multiple frequency regulation units. For wind power, a macro-variable considering frequency and power deviations is constructed based on cooperative control theory, then an adaptive frequency cooperative control method is designed based on rotor speed and pitch angle adjustment, which realizes differentiated utilization of rotor kinetic energy while fully utilizing the power regulation capability of wind turbines. For MMC-HVDC, an active frequency support control method incorporating the effects of the regulation dead band is proposed, enabling adaptive switching of its frequency regulation performance according to the degree of disturbance. On this basis, a phased frequency coordinated control strategy considering the differences in frequency support characteristics of multi-type resources is proposed to maintain frequency stability while limiting the extent of disturbance influence, where the dead zone values of multi-type resources are designed based on their power regulation margins. Finally, the performance of the proposed control strategies is validated using real-time digital simulation.

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Keywords

Large-scale wind power; MMC-HVDC; phased frequency regulation control; dead zone; frequency active support

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