Improved grid integration of wind energy systems

Schulz, Detlef

doi:10.2478/v10175-010-0133-0

Cited by 11 publications

(10 citation statements)

References 8 publications

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“…This power converter was an active (IGBT-based) rectifier providing sinusoidal waveforms of the generator phase currents. This type of standard model was selected due to both its similarity to the proposed PMSG and its huge popularity in power systems based on renewable energy [33]. The rated output power of both models was very similar and equal to approximately 5.4 kW.…”

Section: Simulation Studiesmentioning

confidence: 99%

Generator with modulated magnetic flux for wind turbines

Gwóźdź¹,

Krystkowiak²,

Jędryczka³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In the paper, the concept of a permanent magnet synchronous generator (PMSG) with uniquely designed stator windings for wind turbines is presented. Two 3-phase windings in the stator are used, one of which is connected in the star, while the other in the delta configuration. Six-pulse rectifiers, mutually coupled by the pulse transformer, whose primary winding is supplied by the so-called "current modulator", are placed at the outputs of both windings. The modulator output current should meet all the necessary and strict requirements. Both rectifiers operate on a common DC circuit. These solutions provide the sinusoidal magnetomotive force in the stator of the PMSG and the quasi-sinusoidal (taking into account the non-linearity of the magnetic circuit) magnetic flux. In light of the generator principle, it has been called the "PMSG with modulated the magnetic flux". The slightly higher complexity in the structure of the generator, as compared to the normal threephase construction, is compensated by the exceptional simplicity of the power electronics section of the system, which allows high efficiency to be reached. The current modulator (as well as the pulse transformer) is a power electronics converter with a relatively low output power as compared to the overall output power of the system. In comparison to other known solutions, the expected cost of the system should be lower. It is also expected that a high degree of reliability in terms of its operation will be achieved, and consequently, that the the ongoing costs of its maintenance will be reduced. In the paper, concept, theoretical basis of operation, and results of the studies of the simulation models of the generator, including the basic power electronics section, are presented.

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Section: Simulation Studiesmentioning

confidence: 99%

Generator with modulated magnetic flux for wind turbines

Gwóźdź¹,

Krystkowiak²,

Jędryczka³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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“…7.1b) [11][12][13][14][15]. All these solutions, although more costly than the ones applied at the beginning of the development of wind power in Poland, are characterized by much better regulatory qualities, among which are: the capability of adjusting active and passive power; the capability of operating at varying shaft rotation speeds, rapid reaction to change of wind conditions (0.5-1 ms); avoiding influence and resistance to deteriorating quality of EE in an EEN; and the capability to work in islanding mode [10].…”

Section: Wind Installationsmentioning

confidence: 99%

Power electronic systems as a crucial part of Smart Grid infrastructure - a survey

Benysek¹,

Kaźmierkowski²,

Popczyk³

et al. 2011

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. This article gives a tutorial overview of the most important issues related to the use of power electronic systems in power engineering, with respect to the urgent need for modernization of existing grids in the direction of intelligent networks. The main problems and conditions bound up with the construction of Smart Grids and the location, as well as functioning in them of the most important power electronic systems are presented here. Special attention is directed therein to the potential possibilities of so-called 'smart' transformers and V2G and V2H technologies.

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“…This branch allows to explore and consequently to optimize airflow around buildings and urban structures [1,2]. Microclimate phenomena associated with the airflow around buildings have become of particular interest in the recent years [3][4][5][6]. Nowadays quality requirements concerning microclimate conditions (proper ventilation, elimination of rapid air movement in pedestrian area, protection against noise and cooling caused by the wind, reduction of deposition odors and dirt accumulation) [7] imply the need for aerodynamic testing in the initial phase of design process, where decisions concerning shapes of the objects are made.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of numerical and experimental studies of the airflow around the sample of urban development

Gumowski

Olszewski

Poćwierz

et al. 2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this paper, on the background of a short overview of the recent advances in the field of Environmental Wind Engineering (EWE), a comparison of wind tunnel experiment and numerical simulation for some cases of airflow around an urban layout have been reported. The purpose of the study is quantitative and qualitative comparison of measurements in the wind tunnel as well as numerical simulation using Ansys Fluent software. The study is concerned mostly with the analysis of parameters which are essential in the building industry, such as pressure and velocity fields. In the numerical analysis the k-ε realizable model of turbulence with the basic model of boundary layer -Standard Wall Treatment, were used. Particular attention has been paid to accurate depiction of the conditions on the inlet and the selection of suitable computing.

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Improved grid integration of wind energy systems

Cited by 11 publications

References 8 publications

Generator with modulated magnetic flux for wind turbines

Generator with modulated magnetic flux for wind turbines

Power electronic systems as a crucial part of Smart Grid infrastructure - a survey

Comparative analysis of numerical and experimental studies of the airflow around the sample of urban development

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