Small signal modeling of wind farms

Ebrahimzadeh, Esmaeil; Blaabjerg, Frede; Wang, Xiongfei; Bak, Claus Leth; Lund, Torsten; Andersen, Gert Karmisholt; Suarez, Carlos Gomez; Berg, Jens-Jacob

doi:10.1109/ecce.2017.8096656

Cited by 6 publications

(4 citation statements)

References 18 publications

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“…A weak grid model is considered here including inductive reactance (X g ), resistance (R), and series capacitive reactance (X c ) for compensation. To illustrate sensitivity to variation in the network, short-circuit level, X g /R ratio and line series compensation, three scenarios, are studied, all based on a fictitious wind turbine converter controller, the parameters of which are listed in [21]. The wind turbine has been tuned for a strong grid.…”

Section: Stability Analysismentioning

confidence: 99%

“…In the dq domain, the three-phase converter is disturbed in the dq frame, where three-phase variables can be transformed into the dq domain by the Park's transformation. Similar to the sequence domain, the small-signal impedance/admittance of the converter can be written by a 2 × 2 impedance/admittance matrix [21,22]. In the dq domain, there is a high-coupling between d-axis and q-axis.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

et al. 2019

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It is important to develop modelling tools to predict unstable situations resulting from the interactions between the wind power plant and the weak power system. This paper presents a unified methodology to model and analyse a wind power plant connected to weak grids in the frequency-domain by considering the dynamics of the phase lock loop (PLL) and controller delays, which have been neglected in most of the previous research into modelling of wind power plants to simplify modelling. The presented approach combines both dq and positive/negative sequence domain modelling, where a single wind turbine is modelled in the dq domain but the whole wind power plant connected to the weak grid is analysed in the positive/negative sequence domain. As the proposed modelling of the wind power plant is systematic and modular and based on the decoupled positive/negative sequence impedances, the application of the proposed methodology is relevant for transmission system operators (TSOs) to assess stability easily with a very low compactional burden. In addition, as the analytical dq impedance models of the single wind turbine are provided, the proposed methodology is an optimization design tool permitting wind turbine manufacturers to tune their converter control. As a case study, a 108 MW wind power plant connected to a weak grid was used to study its sensitivity to variations in network short-circuit level, X/R ratio and line series capacitor compensation (Xc/Xg).

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Section: Stability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

et al. 2019

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“…The need to centrally control many power unstable sources (wind and PV power plants) generates many difficulties maintaining system stability [23][24][25]. Hence, the branch of energy system stability modelling is increasingly developing [26,27]. Consequently, conventional methods of power system stability and security assessment show unsatisfactory performance.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Wind Turbine on the Parameters of the Electricity Supply to an Agricultural Farm

et al. 2021

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Wind power plants are an increasingly common source of electricity located in rural areas. As a result of the high variability of wind power, and thus the generated power, these sources should be classified as unstable sources. In this paper, the authors attempted to determine the impact of wind turbine operation on the parameters of electricity supplied to farms located near the source. As a result of the conducted field tests, variability courses of the basic parameters describing the supply voltage were obtained. The influence of power plant variability on the values of voltage, frequency, and voltage distortion factor was determined. To estimate the capacity of the transmission lines, the reactive power produced in the power plant and its effect on the value of the power factor were determined. The conducted research and analysis showed that the wind power plant significantly influences voltage fluctuations in its immediate vicinity (the maximum value registered was close to 2%, while the value required by law was 2.5%). Although all the recorded values are within limits specified by the current regulations (e.g., the THD value is four times lower than the required value), wind turbines may cause incorrect operation of loads connected nearby. This applies mainly to cases where consumers sensitive to voltage fluctuations are installed in the direct vicinity of the power plant.

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“…Grid-connected VSCs' stability challenges are significantly exploited in the literature [20][21][22][23][24]. Therefore, based on the developed small-signal and large-signal models, one can accurately assess the PE-based unit's stability and security [6,25].…”

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confidence: 99%

A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines

et al. 2020

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By the increase of the penetration of power-electronic-based (PE-based) units, such as wind turbines and PV systems, many features of those power systems, such as stability, security, and protection, have been changed. In this paper, the security of electrical grids with high wind turbines penetration is discussed. To do so, first, an overview of the power systems’ security assessment is presented. Based on that, stability and security challenges introduced by increasing the penetration of wind turbines in power systems are studied, and a new guideline for the security assessment of the PE-based power systems is proposed. Simulation results for the IEEE 39-bus test system show that the proposed security guideline is necessary for PE-based power systems, as the conventional security assessments may not be able to indicate its security status properly.

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Small signal modeling of wind farms

Cited by 6 publications

References 18 publications

Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

Impact of the Wind Turbine on the Parameters of the Electricity Supply to an Agricultural Farm

A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines

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