An adaptive droop control strategy with smooth rotor speed recovery capability for type III wind turbine generators

Yang, Dejian; Jin, Zhaoyang; Zheng, Taiying; Jin, Enshu

doi:10.1016/j.ijepes.2021.107532

Cited by 62 publications

(28 citation statements)

References 23 publications

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“…As a result, doubly-fed induction generators (DFIGs) replace the CSGs in power systems for generating active power (Hansen et al, 2016). However, since the DFIG is connected to the electric power grid via back-to-back power electronic devices with DC-link, it is unable to participate in frequency responses including inertia response and primary frequency response (Aziz et al, 2018;Yang et al, 2022). As a result, the high wind power penetration integrated in a power system might result in a severe challenge on frequency stability (Hydro Québec TransÉnergie, 2009;Kim et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In (Attya et al, 2018;Ye et al, 2019), the schemes increase the output power based on the frequency deviation, rate of change of frequency, and both of them. The schemes in (Yang et al, 2018;Kheshti et al, 2019;Yang et al, 2022) increase the output power based on the predefined reliable function, temporary function, and adaptive function. However, the maximum power point tracking operation is implemented prior to disturbances, even though the DFIG has a large potential for frequency regulation; in the case of a low wind speed condition or decreasing wind speed condition, the available kinetic energy is insufficient (Vidyanandan and Senroy, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Primary Frequency Stability Support of a DFIG in Association With Pitch Angle Control

Si¹,

You³

et al. 2022

Front. Energy Res.

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For an electric power grid that has large penetration levels of variable renewable energy including wind generation and photovoltaics, the system frequency stability is jeopardized, which is manifest in lowering frequency nadir and settling frequency. This paper suggests an enhanced primary frequency response strategy of a doubly-fed induction generator (DFIG) in association with pitch angle control. The DFIG works in de-loaded operation with a certain reserve power via pitch angle control prior to disturbances for frequency regulation. To address this, a function of the pitch angle is employed that decreases the pitch angle with time to slowly feed the active power to the power gird. The simulation results demonstrate the effectiveness and feasibility of the proposed primary frequency response strategy including the settling frequency and frequency nadir.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Primary Frequency Stability Support of a DFIG in Association With Pitch Angle Control

Si¹,

You³

et al. 2022

Front. Energy Res.

Self Cite

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“…In addition, DFIGs are connected to the grid by power electronic converters, which decouple the rotor speed of the wind turbine from the system frequency. Consequently, DFIGs are unable to sustain the system frequency (Yang et al, 2022;Yang et al, 2021;Xiong et al, 2021a). With the increasing penetration level of wind power, the power system will face significant challenges in system frequency stability.…”

Section: Introductionmentioning

confidence: 99%

Torque Limit-Based Inertial Control of a DFIG for Rapid Frequency Stabilization

Wang

2021

Front. Energy Res.

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With the increasing penetration of renewable energy generation, the frequency stability of a power grid can be significantly threatened. A doubly-fed induction generator (DFIG) participates in the frequency support of a power grid by releasing kinetic energy (KE) to boost the frequency nadir (FN). However, during rotor speed restoration, it is difficult to counterbalance the size of a second frequency drop (SFD) and the rotor speed recovery duration. This paper proposes an improved torque limit-based inertial control (TLBIC) to raise the FN by releasing less kinetic energy while guaranteeing rapid frequency stabilization with reduced SFD. To this end, when detecting a disturbance, the DFIG enhances the active reference power to the torque limit, and then the active power reduces smoothly based on an exponential function until the maximum power point tracking (MPPT) curve is met, and the rotor speed reverts to the initialization operating condition along the MPPT curve. A simulation system model with various wind power penetrations is established in EMTP-RV. Results show that the proposed scheme boosts the FN at a high level with less KE and guarantees rapid frequency stabilization.

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“…Although it ensures a secure reserve power for supporting the system frequency, significant annual wind energy loss is inevitable. Furthermore, the slow response of the pitch angle control and increasing mechanical stress caused by frequent activations of pitch angle are not beneficial to participate in frequency support (Li et al, 2017;Yang et al, 2021a).…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Short-Term Frequency Response Scheme of a DFIG-Based Wind Farm

2021

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The kinetic energy stored in the doubly-fed induction generators (DFIG)-based wind farm can be utilized to sustain the dynamic system frequency. However, difficulties arise in determining the control gain to effectively improve the frequency nadir and smoothly return to the maximum power point tracking (MPPT) operation. This paper addresses a two-phase short-term frequency response (STFR) scheme to boost the frequency nadir and minimize the second drop in the system frequency based on a piecewise control gain. To achieve the first goal, a constant control coefficient, which is determined according to the initial operating conditions of the DFIG-based wind farm, is employed until the frequency nadir produces. To achieve the second goal, the control coefficient, which changes with time, facilitates to smoothly return to the MPPT operation. The effectiveness of the proposed two-phase STFR scheme is verified under various wind power penetration levels, wind speeds, and disturbances. The results reveal that the frequency nadir is improved, and simultaneously, it smoothly returns to the MPPT operation and minimizes the second drop in the system frequency.

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An adaptive droop control strategy with smooth rotor speed recovery capability for type III wind turbine generators

Cited by 62 publications

References 23 publications

Primary Frequency Stability Support of a DFIG in Association With Pitch Angle Control

Primary Frequency Stability Support of a DFIG in Association With Pitch Angle Control

Torque Limit-Based Inertial Control of a DFIG for Rapid Frequency Stabilization

Two-Phase Short-Term Frequency Response Scheme of a DFIG-Based Wind Farm

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