A recent development in the electrical insulation systems of generators and transformers

Leijon, Mats; Dahlgren, M.; Walfridsson, Lars; Li, Ming; Jaksts, A.

doi:10.1109/57.925298

Cited by 62 publications

(32 citation statements)

References 5 publications

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“…They require a boost converter to interface with an MV network, which is typically 25-40 kV. A full discussion of these conversion systems is beyond the scope of this paper and further information for each topology is available in [22]- [25].…”

Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

“…The first involves generators which operate on MV levels (10-40 kV) using MV cables for the stator windings [1], [22]. For such a system, an HV three-phase converter is utilized for the grid connection [22]. The second involves generators that operate on LV levels as mentioned in Section II.…”

Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

“…Recently, research efforts have turned to the design of two kinds of generators in a transformerless offshore wind turbine. The first involves generators which operate on MV levels (10-40 kV) using MV cables for the stator windings [1], [22]. For such a system, an HV three-phase converter is utilized for the grid connection [22].…”

Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

See 2 more Smart Citations

High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms

Parastar¹,

Seok²

2013

Journal of Power Electronics

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Offshore wind farms are rapidly growing owing to their comparatively more stable wind conditions than onshore and land-based wind farms. The power capacity of offshore wind turbines has been increased to 5MW in order to capture a larger amount of wind energy, which results in an increase of each component's size. Furthermore, the weight of the marine turbine components installed in the nacelle directly influences the total mechanical design, as well as the operation and maintenance (O&M) costs. A reduction in the weight of the nacelle allows for cost-effective tower and foundation structures. On the other hand, longer transmission distances from an offshore wind turbine to the load leads to higher energy losses. In this regard, DC transmission is more useful than AC transmission in terms of efficiency because no reactive power is generated/consumed by DC transmission cables. This paper describes some of the challenges and difficulties faced in designing high-power-density power conversion systems (HPDPCSs) for offshore wind turbines. A new approach for high gain/high voltage systems is introduced using transformerless power conversion technologies. Finally, the proposed converter is evaluated in terms of step-up conversion ratio, device number, modulation, and costs.

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Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

Section: Transformerless Power Conversion Systemsmentioning

confidence: 99%

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High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms

Parastar¹,

Seok²

2013

Journal of Power Electronics

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“…Up to now, mainly water-based transmission lines have been used as high-voltage and high-power units. However, the development in high-voltage cable technology has made them useful as parts of high-voltage and high-power generator systems [2]. The idea of the design of the generator presented here is the outcome of a PhD Thesis [3,4].…”

Section: Introductionmentioning

confidence: 99%

First Trials with a 45 GW Cable-Based Pulsed-Power Generator

et al. 2009

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The output from narrow-band high-power microwave (HPM) sources, such as the virtual cathode oscillator (vircator) and the magnetically insulated line oscillator (MILO), is strongly dependent on the voltage pulse feed. A rectangular, flat-top voltage pulse can be achieved by the use of a transmission line as a pulse-forming unit. The development in high-voltage cable technology has made them useful as parts of high-voltage and high-power generator systems. The generator is designed to deliver a 200 ns voltage pulse of 500 kV into a 10 Ω unmatched load with an electric power of 25 GW. The generator has an impedance of 2 Ω. The primary energy storage of the generator consists of a 50 kV, 20 kJ capacitor bank. The 50 kV is discharged into a transformer that charges a pulse-forming line to 550 kV. When charged, the pulse-forming line is discharged into the load via a spark gap. This paper presents results from initial testing of the generator.

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“…This is a desirable quality in a vehicle, where a large peak power is necessary during acceleration and, if electrical breaks are used, a large amount of power is generated for a short while when breaking, which implies a more efficient use of energy, resulting in lower fuel consumption. Individual flywheels are capable of storing up to 500MJ and peak power ranges from kilowatts to gigawatts, with the higher powers aimed at pulsed power applications [5] and also in power transformers [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Flywheel Energy Storage System Using Magnetic Levitation

Ramya¹,

M²,

Nanthine³

et al. 2017

IJARCSSE

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Abstract-This paper deals with the voltage sag compensator in a system using flywheel energy storage system technology by using partial magnetic levitation. Voltage fluctuates in a generator from second to second and due to these fluctuations, it becomes difficult to meet the consumer demand since they account to high current losses. In such a case, Flywheels are used where energy is stored mechanically and transferred to and from the flywheel by an integrated motor/generator. Today flywheels are used as supplementary UPS storage at several industries world over. Future applications span a wide range including electric vehicles, intermediate storage for renewable energy generation and direct grid applications from power quality issues to offering an alternative to strengthening transmission. One of the key advantages of flywheel is that it compensates for the losses of the system by its storage mechanism and thus high overall efficiency is attained. When voltage is increased, current losses are reduced and transformer steps become redundant. Recent progress in semi-conductor technology enables faster switching and lower costs. Flywheel with magnetic bearings using magnetic levitation has been introduced for effectiveness of the system and to overcome frictional losses. The predominant parts of prior studies have been directed towards optimizing mechanical issues whereas the electro technical part now seems to show great potential for improvement. An overview of flywheel technology and previous projects are presented and moreover a 200kW flywheel using high voltage technology is simulated.

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A recent development in the electrical insulation systems of generators and transformers

Cited by 62 publications

References 5 publications

High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms

High-Power-Density Power Conversion Systems for HVDC-Connected Offshore Wind Farms

First Trials with a 45 GW Cable-Based Pulsed-Power Generator

Flywheel Energy Storage System Using Magnetic Levitation

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