Dynamic frequency support with DFIG wind turbines — A system study

Mende, Denis; Hennig, Tobias; Akbulut, Alev; Becker, Holger; Hofmann, Lutz

doi:10.1109/epec.2016.7771694

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…While the current sources of the detailed WT models depend on the state variables of the differential equations at each time step, the current sources of the simplified WT models at each time step are calculated using the terminal voltages of the last time step (see 14,15,22), which are obtained from (24). The resulting current sources are used to obtain the terminal voltages at the current time step, which serve as input variables of the WT model structures, as illustrated in Figs.…”

Section: Norton Equivalent Circuitsmentioning

confidence: 99%

“…Frequency stability studies are traditionally conducted using RMS simulations, which are capable of simulating much longer events and much larger grid areas compared to EMT simulations [14,[18][19][20]. The RMS wind turbine (WT) models used in frequency stability studies, which are designed based on fundamental machine and converter equations and are also known as quasi-stationary models in the literature, require smaller simulation time steps compared to the conventional active devices (i.e., synchronous generators and dynamic loads) due to comparatively smaller time constants of the converter controllers [6,10].…”

Section: Introductionmentioning

confidence: 99%

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Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Goudarzi

Reus

Hofmann

2023

Elektrotech. Inftech.

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The contribution of wind turbines (WTs) to enhance the frequency stability of power systems is traditionally analyzed using commonly applied root mean square (RMS) models. RMS WT models require smaller simulation time steps compared to conventional active devices (i.e., synchronous generators and dynamic loads) due to the comparatively smaller time constants of the converter controllers. Such small time steps become relevant in simulations of large-scale power systems with a high level of WT penetration and lead to high computational time and effort. This paper presents simplified simulation models of a doubly-fed induction generator-based WT and a full-scale converter-based WT, which enable higher simulation time steps due to the negligence of very small time constants with no relevant effects in the time frame of interest of frequency stability analysis. The models are derived from detailed RMS WT models based on fundamental machine and converter equations. In order to verify the validity of the underlying simplifications, the simplified models are compared to the detailed RMS models with a focus on their general behavior in case of step responses and their frequency responses in the event of a frequency drop in a 220 kV test system. For this purpose, both the detailed RMS WT models as well as the simplified WT models are extended with a droop-based fast frequency response controller and implemented in a MATLAB-based RMS simulation tool. The results of the case studies show feasible and comparable general behavior of the WT models as well as plausible frequency responses.

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Section: Norton Equivalent Circuitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Goudarzi

Reus

Hofmann

2023

Elektrotech. Inftech.

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“…At lower wind speeds, power output can be produced by VSSG, but it is not stable and feasible compared to DPSG when it comes to voltage fluctuations [22]. Ref [15] analysed an IEEE 39-Bus system with DFIG based WT as an opportunity to provide support to synthetic inertia and primary frequency control which is known as active power functionalities. Compared to an original system, the frequency behaviour was not favourable with a penetrated system of 50% by standard WPP.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In brief, an IEEE 9-Bus system consists of 3 loads, 3 transformers, 3 SGs, 6 transmission lines, and 9 buses where all connections are made at their respective phases. Researchers made use of prominent platforms such as MATLAB/ Simulink[4,14], DIgSILENT PowerFactory by DIgSILENT Simulation Language (DSL)[15], and ETAP[10] to construct the IEEE system and carry simulation. Again, based on familiarisation and simplicity, the MATLAB/ Simulink R2019a will be used as the simulation platform throughout the entire research.In this research, a series of simulations will be carried out where the network will be investigated with three-phase fault implementation at different transmission line locations.…”

mentioning

confidence: 99%

Transient stability analysis of IEEE 9-bus system integrated with DFIG and SCIG based wind turbines

Ramlochun

Vaithilingam

Alsakati

et al. 2021

J. Phys.: Conf. Ser.

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Electricity is in high demand with a fast-growing population; hence it is advisable to turn towards green energy. In this research, Wind Turbine (WT) is modelled with two different types of induction generators (IGs), which are the Doubly-Fed Induction Generator (DFIG) and Squirrel-Cage Induction Generator (SCIG) and implemented to IEEE 9-Bus system to assess the transient stability. MATLAB/ Simulink R2019a platform was considered to carry the whole examination. DC1A excitation system was applied to Synchronous Generators (SGs) as well as Power System Stabilizer (PSS). The transmission line7-5 was found to suffer from a high peak value of a relative power angle of approximately 130 degrees. As for the settling time, without PSS it was 20.69 s and with PSS it became 6.23 s. A wind farm with a rated capacity of 60 MW was used in the system. WT integrated with DFIG has the lowest peak value of 127 degrees at Bus locations 4 and 5 and for SCIG, Bus 5 with a peak value of 136 degrees. Thus, it can be propelled as the perfect location. Moreover, this is due to the three-phase fault was located at the transmission line7-5 which is far away from Buses 4 and 5. In the end, the WT integrated with DFIG provides a lower peak value of relative power angle compared to SCIG, whereas for settling time, it is the opposite.

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About the Need of Combining Power Market and Power Grid Model Results for Future Energy System Scenarios

Mende

Böttger

Löwer

et al. 2018

J. Phys.: Conf. Ser.

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Dynamic frequency support with DFIG wind turbines — A system study

Cited by 7 publications

References 15 publications

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Transient stability analysis of IEEE 9-bus system integrated with DFIG and SCIG based wind turbines

About the Need of Combining Power Market and Power Grid Model Results for Future Energy System Scenarios

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