Permanent magnet generator control and electrical system configuration for Wave Dragon MW wave energy take-off system

Zhou, Zhongfu; Knapp, W.; MacEnri, J.; Sørensen, Henrik Kragh; Friis-Madsen, Erik; Masters, Ian; Igić, Petar

doi:10.1109/isie.2008.4677255

Cited by 24 publications

(9 citation statements)

References 5 publications

(4 reference statements)

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“…In the case of variable-speed generation, different configurations have been suggested by different WEC developers: A doubly-fed induction generator (DFIG) for an OWC converter [7], a permanent magnet synchronous generator (PMSG) for the Lifesaver [118] and Wavedragon converter [119], or a variable-speed induction generator by Oceanlinx [116] and Wavestar [89].…”

Section: Variable-speed Generationmentioning

confidence: 99%

A Review of Wave-to-Wire Models for Wave Energy Converters

2016

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Control of wave energy converters (WECs) has been very often limited to hydrodynamic control to absorb the maximum energy possible from ocean waves. This generally ignores or significantly simplifies the performance of real power take-off (PTO) systems. However, including all the required dynamics and constraints in the control problem may considerably vary the control strategy and the power output. Therefore, this paper considers the incorporation into the model of all the conversion stages from ocean waves to the electricity network, referred to as wave-to-wire (W2W) models, and identifies the necessary components and their dynamics and constraints, including grid constraints. In addition, the paper identifies different control inputs for the different components of the PTO system and how these inputs are articulated to the dynamics of the system. Examples of pneumatic, hydraulic, mechanical or magnetic transmission systems driving a rotary electrical generator, and linear electric generators are provided.

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Section: Variable-speed Generationmentioning

confidence: 99%

A Review of Wave-to-Wire Models for Wave Energy Converters

2016

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“…This power and force control can also be achieved by using the back to back converter, the recti er, or the dc-dc converter in [35,38]. By using these converters, the control strategy can be made sensor-less to the speed.…”

Section: Magnets With Poles (Nsn…)-statormentioning

confidence: 99%

“…S p = 1 0 P < P * P > P * for the inverter which has been applied in [38,97,107]. The real power control and the dc voltage control will correspond to the I * d , while the reactive power will correspond to I * q as shown in Figure 2.13.…”

Section: Power Control Technique At the Invertermentioning

confidence: 99%

Energy recovery from landing aircraft

Zulkifli¹

2012

2012 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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Currently, renewable energy sources are the main driver for future electricity generation. This trend is growing faster in the developed countries in order to reduce the green house e ect and also in response to the limited supply of oil, gas and coal which are currently the major sources for electric generation. For example, the main renewable energy sources are from wind energy and solar energy but these energies are only available to those countries that are exposed to these resources. In this thesis an alternative energy source is investigated where it can be generated from the moving objects or in form of kinetic energy. The idea is to convert the kinetic energy during landing aircraft into electrical energy which it can also be stored and transferred to the existing electrical network. To convert this kinetic energy to electrical energy, the linear generator (LG) and uncontrolled recti er have been used for energy conversion. The LG have been modelled in 3-phase model or in dq model and combined with the diode recti er that is used to generate the dc signal outputs. Due to the uncontrolled recti er the electrical outputs will have decaying amplitude along the landing time. This condition also happen to the LG outputs such as the force and the power output. In order to control these outputs the cascaded buck-boost converter has been used. This converter is responsible to control the output current at the recti er and also the LG output power during landing to more controllable power output. Here, the H ∞ current control strategy has been used as it o ers a very good performance for current tracking and to increase the robustness of the controller. During landing huge power is produced at the beginning and when the landing time is increased, the generated input power from LG is reduced to zero. Due to this, the energy storage that consits of ultracapacitor, bidirectional converter and boost converter are usedin order to store and to release the energy depends on the input power source and load grid power. The voltage proportional-integral (PI) control strategy has been used for both the converters. The last part is to transfer the energy from the source and at the ultracapacitor to the load by using the inverter as the processing device. The power controller and current controller are used at the inverter in order to control the power ow between the inverter and the grid. This is when the reference power is determined from the load power in order to generate the reference current by using the voltage oriented controller (VOC), while the H ∞ current controller is used to regulate the inverter current in order to inject the suitable amount of current that refer to the load power. Finally, a complete energy recovery system for landing aircraft with the grid connection have been put together to make the whole system to be as a new renewable energy source for the future electricity generation.

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“…Table 1 Compared with other forms of offshore renewable energy, such as solar photovoltaic, wave energy is continuous but highly variable. It is simple to achieve short-term energy storage in hydraulic systems, which is necessary to achieve the smooth electricity production [11][12][13]. The main storage technologies for the captured wave energy include storage batteries [14], compressed air [15], super capacitors and flywheel energy storage [16].…”

Section: Introductionmentioning

confidence: 99%