Energy Storage Supplementary Damping Control Method Based on Model-Free Adaptive Dual-Channel Coordination for Suppressing Sub-synchronous Oscillations in DFIG Wind Farms
Huang Lingling1,2, Xu Liannan3, Fu Zhangjie1, Fu Yang1,2
1. Faculty of Electrical Engineering Shanghai University of Electric Power Shanghai 200090 China;
2. Engineering Research Center of Offshore Wind Technology Ministry of Education Shanghai University of Electric Power Shanghai 200090 China;
3. CHN Energy Suqian Power Generation Co. Ltd Suqian 223800 China
The integration of large-scale doubly-fed induction generator (DFIG)-based wind farms into series-compensated transmission systems significantly raises the risk of sub-synchronous oscillation (SSO), which threatens power system security and operational stability. Conventional sub-synchronous damping controllers (T-SSDCs) rely on accurate mathematical models and fixed-frequency band-pass filters. However, modern power systems exhibit increasingly complex, time-varying, and nonlinear characteristics due to the high penetration of renewable energy and power electronics. This leads to model mismatches, poor adaptability under shifting oscillation modes, and even resonance issues. To overcome these limitations, this paper proposes a novel model-free adaptive control-based multi-input single-output sub-synchronous damping controller (MFAC-MISO-SSDC) integrated with a grid-side energy storage converter. The objective is to achieve effective SSO suppression without requiring a precise system model, while enhancing bandwidth adaptability, transient performance, and robustness across diverse operating conditions.
The proposed controller operates within a data-driven framework. First, the compact form dynamic linearization (CFDL) technique is adopted to establish an equivalent virtual data model that depends solely on real-time input-output measurements of the controlled system (including the DFIG wind farm, series-compensated line, and energy storage system). This completely eliminates the need for an explicit mathematical representation. Second, a dual-channel coordinated damping architecture is developed by extending the conventional single-input single-output (SISO) MFAC structure to a multi-input single-output (MISO) configuration. Specifically, the controller takes the fluctuation of the *d*-axis voltage at the point of common coupling (PCC), Δupd, as the sole input, and generates two independent supplementary control signals: Δid (active current reference adjustment) and Δiq(reactive current reference adjustment). These signals are respectively injected into the active and reactive current inner loops of the energy storage converter, thereby enabling coordinated active-reactive damping. The pseudo-gradient (PG) vector is estimated online via a modified parameter update law with a resetting mechanism, ensuring that cross-coupling effects are automatically captured without explicit decoupling. Furthermore, an improved control criterion function is designed to achieve “on-demand injection and timely withdrawal” of damping signals. The closed-loop stability is rigorously proved using Lyapunov methods, demonstrating the uniform ultimate boundedness of tracking errors and bounded-input bounded-output (BIBO) stability. Key control parameters are systematically tuned using the Grey Wolf Optimizer (GWO) algorithm under stability constraints defined by the theoretical analysis.
Extensive PSCAD/EMTDC simulations are conducted on a practical 100×5 MW DFIG wind farm with a 100 MW/200 MWh energy storage system. (1) Under continuously varying series compensation (35%-55%-75%), the MFAC-MISO-SSDC suppresses SSO within 0.5 s. (2) Across nine operating conditions (varying wind speed, compensation level, SCR, PI parameters, and number of turbines), the proposed controller consistently outperforms T-SSDC and MFAC-SISO-SSDC, achieving faster convergence and smaller overshoot, especially when the dominant SSO frequency shifts significantly. (3) Under large disturbances (three-phase fault and wind turbine tripping), the controller rapidly damps oscillations and restores stability, whereas uncontrolled cases suffer sustained oscillations.
The proposed MFAC-MISO-SSDC successfully integrates model-free adaptive control with active-reactive dual-channel coordinated damping, providing a practical and highly resilient solution for SSO mitigation in DFIG-based wind farms connected via series-compensated lines. It eliminates dependence on accurate system models, adapts online to varying operating conditions and oscillation frequencies, and delivers improved dynamic performance and robustness compared to both traditional and single-channel model-free controllers. The theoretical stability proof and GWO-based parameter tuning ensure engineering feasibility. This work offers a promising data-driven approach for enhancing the stability of high-renewable-penetration power systems.
黄玲玲, 许练楠, 付张杰, 符杨. 抑制双馈风电场次同步振荡的储能附加无模型自适应双通道协同阻尼控制方法[J]. 电工技术学报, 0, (): 66-.
Huang Lingling, Xu Liannan, Fu Zhangjie, Fu Yang. Energy Storage Supplementary Damping Control Method Based on Model-Free Adaptive Dual-Channel Coordination for Suppressing Sub-synchronous Oscillations in DFIG Wind Farms. Transactions of China Electrotechnical Society, 0, (): 66-.
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