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<p>Integrating large shares of wind energy into modern power grids has necessitated the use of heavily series-compensated transmission lines, which in turn exacerbate the risk of sub-synchronous resonance (SSR). SSR introduces negative equivalent resistance in the dynamics of doubly-fed induction generators (DFIGs), leading to prolonged oscillations that may damage generator shafts, converters, and other components. This study proposes a novel damping controller implemented in the outer voltage control loop of the grid side converter (GSC), designed to collaborate with wide area measurement systems (WAMS) and phasor measurement units (PMUs) for effective SSR mitigation. Simulation results based on the IEEE First Benchmark Model, validated using OPAL-RT real-time simulations, demonstrate that the proposed controller achieves up to 65–70% reduction in oscillation amplitudes, a 40% reduction in THD, and significantly faster settling times compared to conventional controllers. For instance, electromagnetic torque oscillations that persist beyond 30&#xa0;s without damping are suppressed within 0.05&#xa0;s with the proposed controller, while active and reactive power fluctuations settle within 0.1–0.15&#xa0;s. Similarly, DC-link voltage oscillations are reduced from peaks of 3 pu (Case 1) to 0.1 pu (Case 4). Stepwise compensation studies (15–60%) further confirm that while conventional methods become unstable under high compensation, the proposed damping controller ensures robust stability, lower overshoot (&lt; 1.05 pu), and improved transient response across operating conditions. Overall, the results establish the effectiveness of the proposed strategy in mitigating SSR, reducing harmonic distortion, and improving the resilience and reliability of DFIG-based wind farms under high-compensation scenarios.</p>

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Damping controller implementation for sub-synchronous resonance mitigation in DFIG systems using real-time simulation

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Jawaharlal Bhukya

摘要

Integrating large shares of wind energy into modern power grids has necessitated the use of heavily series-compensated transmission lines, which in turn exacerbate the risk of sub-synchronous resonance (SSR). SSR introduces negative equivalent resistance in the dynamics of doubly-fed induction generators (DFIGs), leading to prolonged oscillations that may damage generator shafts, converters, and other components. This study proposes a novel damping controller implemented in the outer voltage control loop of the grid side converter (GSC), designed to collaborate with wide area measurement systems (WAMS) and phasor measurement units (PMUs) for effective SSR mitigation. Simulation results based on the IEEE First Benchmark Model, validated using OPAL-RT real-time simulations, demonstrate that the proposed controller achieves up to 65–70% reduction in oscillation amplitudes, a 40% reduction in THD, and significantly faster settling times compared to conventional controllers. For instance, electromagnetic torque oscillations that persist beyond 30 s without damping are suppressed within 0.05 s with the proposed controller, while active and reactive power fluctuations settle within 0.1–0.15 s. Similarly, DC-link voltage oscillations are reduced from peaks of 3 pu (Case 1) to 0.1 pu (Case 4). Stepwise compensation studies (15–60%) further confirm that while conventional methods become unstable under high compensation, the proposed damping controller ensures robust stability, lower overshoot (< 1.05 pu), and improved transient response across operating conditions. Overall, the results establish the effectiveness of the proposed strategy in mitigating SSR, reducing harmonic distortion, and improving the resilience and reliability of DFIG-based wind farms under high-compensation scenarios.