Coordinated control of rotor kinetic energy and pitch angle for large‐scale doubly fed induction generators participating in system primary frequency regulation

Yang, Pengfei; He, Baina; Wang, Biao; Dong, Xinmin; Liu, Wenying; Zhang, Jihong; Wu, Zhenkui; Liu, Jing‐Xia; Qin, Zhigang

doi:10.1049/rpg2.12153

Cited by 20 publications

(9 citation statements)

References 19 publications

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“…The pitch angle controller response is slow because of its high mechanical time constant and causes fatigue load. The pitch angle controller is usually coordinated at the wind farm level [33,84,85]. The traditional pitch angle controller is depicted in Figure 18.…”

Section: Pitch Angle Controlmentioning

confidence: 99%

Provision of Frequency Response from Wind Farms: A Review

et al. 2021

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Renewable sources of energy play a key role in the process of decarbonizing modern electric power systems. However, some renewable sources of energy operate in an intermittent, non-dispatchable way, which may affect the balance of the electrical grid. In this scenario, wind turbine generators must participate in the system frequency control to avoid jeopardizing the transmission and distribution systems. For that reason, additional control strategies are needed to ensure the frequency response of variable-speed wind turbines. This review article analyzes diverse control strategies at different levels which are aimed at contributing to power balancing and system frequency control, including energy storage systems.

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Section: Pitch Angle Controlmentioning

confidence: 99%

Provision of Frequency Response from Wind Farms: A Review

et al. 2021

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“…Researchers in [22] developed a de‐loading pitch control scheme in which capacity is held in reserve for frequency regulation. Researchers in [23] integrated rotor kinetic energy control with pitch angle control for primary frequency regulation.…”

Section: Introductionmentioning

confidence: 99%

Preventive frequency control of a microgrid with deloaded wind turbines using analytical frequency predictor and a PSO‐based pitch angle optimizer

Luo

Xiao

Huang

et al. 2023

IET Renewable Power Gen

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Microgrids that rely heavily on photovoltaic (PV) and wind generation are vulnerable to frequency dips under severe weather conditions. This paper presents a preventive frequency control strategy to avoid under‐frequency load‐shedding due to drastic changes in renewable power generation and load. An analytical frequency predictor based on series expansion of matrix exponential is first presented to estimate future system frequency accurately in an efficient manner. When there is risk that future system frequency will drop to a level below the under‐frequency threshold, the pitch angle is increased in advance according to a trapezoidal pitch angle command such that mechanical energy can be stored in the de‐loaded wind turbine. The reserved mechanical energy is released later on to improve future frequency nadir to a level above the under‐frequency threshold. The parameters for the trapezoidal pitch angle command such as time and maximum pitch angle are determined using particle swarm optimization (PSO) algorithm. Results from MATLAB/Simulink simulations demonstrated the accuracy of the proposed analytical frequency predictor and the effectiveness of the proposed preventive frequency controller in avoiding future under‐frequency load‐shedding.

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“…Therefore, wind power is required to introduce additional control to provide more inertia, so as to improve the frequency stability of the power system. At present, the additional control of wind turbine providing inertia for frequency regulation mainly includes virtual inertia control [14] and pitch angle control [15]. Among them, the wind turbine adopts virtual inertia control when it is under the rated wind speed, which increases the output power response system frequency by releasing rotor kinetic energy.…”

Section: Introductionmentioning

confidence: 99%

Small Signal Stability Analysis and Optimize Control of Large-Scale Wind Power Collection System

Jiang

Yang

et al. 2022

IEEE Access

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The frequency security problem of power system is highlighted as wind power penetration increases yearly, the eigenvalue analysis method based on the deterministic model is difficult to accurately evaluate the small signal stability of power system. The Weibull probability distribution is used to describe the uncertainty of wind speed. In this paper, the shape and scale parameters of the Weibull distribution are calculated by using the maximum likelihood approach and combining with the measured data, and the stability of small signal with large-scale wind power access is analyzed by the probability distribution method. Meanwhile, considering that the lack of inertia of the system caused by high-penetration wind power access can easily lead to the problem of frequency stability, it is proposed to take the maximum damping ratio of regional oscillation mode as optimization objective, virtual inertia and pitch angle control parameters as variables, and frequency stability as constraints, an small signal stability optimization model of wind power access to power system is established according to the proposed probabilistic small signal stability model. The sensitivity algorithm is used to obtain the optimal solution for the virtual inertia and pitch angle control parameters, and the validity of the proposed method and model is verified by two-area four-machine examples. Simulation results show that by optimizing the virtual inertia and pitch angle parameters of wind turbines, the small signal stability of the high-penetration wind power access system can be improved under the condition of ensuring sufficient inertia of the system, which provides a certain theoretical basis for the safe and reliable operation of wind power large-scale cluster access power system.INDEX TERMS Uncertainty of wind power output; maximum likelihood estimation; small signal stability; virtual inertia; pitch angle control; damping ratio; sensitivity analysis

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Coordinated control of rotor kinetic energy and pitch angle for large‐scale doubly fed induction generators participating in system primary frequency regulation

Cited by 20 publications

References 19 publications

Provision of Frequency Response from Wind Farms: A Review

Provision of Frequency Response from Wind Farms: A Review

Preventive frequency control of a microgrid with deloaded wind turbines using analytical frequency predictor and a PSO‐based pitch angle optimizer

Small Signal Stability Analysis and Optimize Control of Large-Scale Wind Power Collection System

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