Lightweight, ironless-stator, PM generators for direct-drive wind turbines

Spooner, P. D.; Gordon, E; French, C.D.

doi:10.1049/cp:20040254

Cited by 22 publications

(17 citation statements)

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“…There is an influence of the consumer class, the available budget, conveniences, and power needs. Considerations about installation and maintenance must be made by qualified professionals who will decide about additional accessories, such as protection cover against the wear and tear of nature, protecting devices, a transferswitch, a data logger, and so on [10][11][12].…”

Section: Generator Selection For Wind Energymentioning

confidence: 99%

Small Wind Energy Systems

Simões

Farret

Blaabjerg

2015

Electric Power Components and Systems

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Section: Generator Selection For Wind Energymentioning

confidence: 99%

Small Wind Energy Systems

Simões

Farret

Blaabjerg

2015

Electric Power Components and Systems

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“…is the grid line frequency. If the -axis of the rotating frame is oriented along the grid voltage vector , then the converter active power and reactive power can be formulated by (9) From (9), it is shown that the converter output active power and reactive power can be controlled independently by controlling the -axis and -axis current. Based on this, the vector control diagram for the grid-side cascaded H-bridge converter is developed as illustrated in Fig.…”

Section: Model Of Grid-side Cascaded H-bridge Converter and Contromentioning

confidence: 99%

“…Previous papers have studied the design of multipole direct-drive PMG, which has a number of isolated coils [9], [10]. Similar converter topologies are proposed in [11] and [12], without further considering the control and implementation issues, whereas in [2] and [13], the authors mainly focus on the control of the cascaded H-bridge inverters with a staircase modulation.…”

Section: Introductionmentioning

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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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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“…Each module is composed of a rectifier fed from isolated generator coils, a dc-link and an H-bridge inverter as shown in Fig.1 (b). Previous papers have studied the design of the multi-pole direct-drive PMG and the operation of the converter system [3][4][5][6][7]. This paper specifically focuses on the reduction of the dc-link voltage ripple in each converter module as shown in Fig.1 (b).…”

Section: Introductionmentioning

confidence: 99%

DC-link voltage ripple reduction for a transformerless modular wind generator system

Yuan

Chai

et al. 2010

5th IET International Conference on Power Electronics, Machines and Drives (PEMD 2010)

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An important issue in the single phase converter system is to deal with the pulsating power which is the twice of the fundamental frequency. The pulsating power may shorten the lifetime of the dc-link capacitor and affect the system control performance. This paper has presented some methods to reduce the dc-link voltage ripple caused by the pulsating power in a modular converter for a multi-coil direct-drive permanent magnet wind generator system. At the generator side, the generator coils with 90 degree phase shift are rectified through power factor correction (PFC) circuit and connected in parallel to counteract the pulsating power to achieve the stable dc-link power. At the grid side, the pulsating power frequency (100Hz or 120Hz) will be twice of the grid frequency, which can be compensated by adjusting the wind generator output power, thus reducing the required dc-link capacitor value. A proportional-integral-resonant (PIR) controller is introduced in the dc-link voltage control loop and generator coil current control loop to generator the required pulsating power to compensate the grid-side pulsating power. The corresponding impact of the current harmonics to the generator torque is analyzed in the paper. Meanwhile, the required dc-link capacitor value is also given in the paper. The simulation results validate the proposed control scheme.

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Lightweight, ironless-stator, PM generators for direct-drive wind turbines

Cited by 22 publications

References 0 publications

Small Wind Energy Systems

Small Wind Energy Systems

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

DC-link voltage ripple reduction for a transformerless modular wind generator system

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