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High-Frequency Oscillation Suppression Strategy for VSG MMC-HVDC Integrated Offshore Wind Farms Considering Frequency
Haichang Sun1,2, Weiwei Yao2,3, Hailang Shi1,2
1School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China.
Sensors (Basel, Switzerland)
|March 14, 2026
Summary
Virtual Synchronous Generator (VSG) control in offshore wind farms can cause high-frequency oscillations. This study identifies a new frequency coupling effect and proposes a band-stop filter to suppress these oscillations effectively.
Area of Science:
- Electrical Engineering
- Power Systems Engineering
- Renewable Energy Integration
Background:
- Offshore wind farms integrated with MMC-HVDC systems utilize Virtual Synchronous Generator (VSG) control for active support.
- VSG control can introduce high-frequency oscillations not predicted by conventional stability analysis.
- Existing oscillation suppression methods are inadequate for VSG-controlled systems due to unaddressed frequency coupling.
Purpose of the Study:
- To reveal and analyze the high-frequency frequency coupling effect in VSG-controlled MMC-HVDC offshore wind farms.
- To identify the root causes of this coupling, specifically asymmetric control and control delay.
- To propose an effective oscillation suppression strategy.
Main Methods:
- Analysis of frequency coupling effects between wind turbine Grid-Side Converter (GSC) and VSG-controlled Wind-Farm-side MMC (WFMMC).
- Identification of VSG control asymmetry and control delay as key coupling factors.
- Development and simulation of a band-stop filter suppression strategy in the WFMMC voltage sampling loop.
Main Results:
- A novel high-frequency-range frequency coupling effect was identified, distinct from conventional V-f control systems.
- Asymmetric VSG control structure and control delay were confirmed as primary drivers of this coupling.
- Time-domain simulations validated the proposed band-stop filter strategy's effectiveness in suppressing oscillations.
Conclusions:
- The identified frequency coupling is a critical issue in VSG-controlled offshore wind farms.
- The proposed band-stop filter strategy effectively mitigates high-frequency oscillations caused by this coupling.
- This research provides a pathway for enhancing the stability of grid-integrated offshore wind power systems.
Keywords:
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