Overview of power converter designs feasible for high voltage transformer-less wind turbine

Sztykiel, Michal

doi:10.1109/isie.2011.5984368

Cited by 11 publications

(7 citation statements)

References 11 publications

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“…From (4), the larger the inductance is, the larger the zero-crossing distortion angle will be, which affects the current waveform and reduces the generator power factor. Therefore, the upper limit of the inductance should meet (5) where…”

Section: A Converter Cell Topology and Design Considerationsmentioning

confidence: 99%

“…The ground-wall insulation is imposed to the highest voltage stress at end winding terminal, which corresponds to ground voltage. Also, semiconductive coating and ripple springs are used to eliminate the possibility for external partial discharges (corona) caused by air voids between ground-wall insulation and a stator core [5].…”

Section: Generator Design Considerationsmentioning

confidence: 99%

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A Transformer-Less High-Power Converter for Large Permanent Magnet Wind Generator Systems

Yuan

Chai

2012

IEEE Trans. Sustain. Energy

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The power conversion systems for large wind turbines are facing a great challenge as today's wind turbine power outputs approach 5 MW and above. The conventional low voltage power conversion system will suffer from a high transmission current, which significantly increases losses and cost of the cables as well as voltage drop. This paper proposes a modular, medium voltage, high-power converter topology for the large permanent magnet wind generator system, eliminating the grid-side step-up transformer, which is desirable for both onshore and offshore wind turbines. The converter modules are cascaded to achieve medium voltage output. Each converter module is fed by a pair of generator coils with 90 phase shift to get the stable dc-link power. The power factor correction (PFC) circuit enables the generator to achieve unity power factor operation and the generator armature inductance is used as ac-side PFC boost inductance. At the grid-side, H-bridge inverters are connected in series to generate multilevel medium voltage output and the voltage-oriented vector control scheme is adopted to regulate the converter active and reactive power transferred to the grid. Simulation results with a 2-MW wind turbine system and experimental results with a down-scaled 3-kW system validate the proposed topology and control methods. The proposed system can successfully deliver power from the wind generator to the grid.Index Terms-Cascaded H-bridge converter, high-power medium voltage converter, permanent magnet generator, transformer-less, wind power.

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Section: A Converter Cell Topology and Design Considerationsmentioning

confidence: 99%

Section: Generator Design Considerationsmentioning

confidence: 99%

A Transformer-Less High-Power Converter for Large Permanent Magnet Wind Generator Systems

Yuan

Chai

2012

IEEE Trans. Sustain. Energy

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“…This configuration has been widely adopted in the most prevalent wind farms in a real industry application. Recently, research has been carried out to eliminate the bulky low frequency AC transformer in wind generation system [4]. By making use of the machine windings and cascaded module, [5] proposes a transformer-less Megawatt wind generator system.…”

Section: Introductionmentioning

confidence: 99%

Solid-state transformer interfaced PMSG wind energy conversion system

Gao

Husain

Wang

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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The solid-state transformer (SST) has been regarded as an emerging technology where emphasis is mainly on the design of the device. To explore its system integration opportunities, this paper proposes and demonstrates a SST interfaced permanent magnet synchronous generator (PMSG) wind energy conversion system. The system integration issues along with wind turbine level control methods have been presented and simulated for power management. Moreover, the lab hardware prototype has been set up, which consists of an induction motor based wind turbine emulator (WTE), PMSG, pulse-width modulation (PWM) rectifier, SST, and resistive load bank. Experiments have been carried out to validate the proposed system and control strategy.

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“…Especially, it also needs complex neutral‐point balance control. The third option is to use a high‐voltage transformer‐less wind conversion system proposed in . In such scheme, there is a multiphase 10 kV PMSG with many pairs of spatially orthogonal windings; each of them interfaces to a single‐phase active rectifier.…”

Section: Introductionmentioning

confidence: 99%

A four-leg three-level neutral-point-clamped inverter for offshore wind turbine with VSC-based HVDC transmission

Zhang

Chen

et al. 2013

Int. Trans. Electr. Energ. Syst.

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SUMMARYA kind of multiconverter wind power conversion system with HVDC transmission based on VSCs is discussed for 10 MW offshore wind turbine. HVDC transmission is implemented by multiple modular VSCs that are serially connected by means of multiphase PMSG in the nacelle of wind turbine and multiwinding transformer in onshore power substation. As basic building blocks, power loss properties of different VSC topologies are compared. Then, a traditional three-level neutral-point-clamped voltage source inverter (3L-NPC VSI) mixed with an added FC leg is proposed for HVDC transmission. The added FC leg is used to deal with the intrinsic neutral-point imbalance issue of 3L-NPC VSI, including voltage fluctuation and DC drift. Four kinds of different balance control strategies are presented, and their performances are compared. Simulation and experiment results verify the effectiveness of the control strategies. Finally, it is proved that the power loss property of four-leg 3L-NPC VSI is better than the traditional 2L VSI regardless of additional power loss offered by the added FC leg.

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Overview of power converter designs feasible for high voltage transformer-less wind turbine

Cited by 11 publications

References 11 publications

A Transformer-Less High-Power Converter for Large Permanent Magnet Wind Generator Systems

A Transformer-Less High-Power Converter for Large Permanent Magnet Wind Generator Systems

Solid-state transformer interfaced PMSG wind energy conversion system

A four-leg three-level neutral-point-clamped inverter for offshore wind turbine with VSC-based HVDC transmission

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