Grid-connected marine current generation system power smoothing control using supercapacitors

Zhou, Zhibin; Scuiller, Franck; Charpentier, Jean-Frédéric; Benbouzid, Mohamed; Tang, Tianhao

doi:10.1109/iecon.2012.6389244

Cited by 16 publications

(18 citation statements)

References 7 publications

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“…A torque reference MPPT control strategy [16][17] is assumed to have a similar effect in reducing the generator power fluctuations. The torque reference MPPT (also called optimal torque control) calculates the reference torque as e_ref = p_max (13) This strategy does not need measuring the marine current speed. The reference torque is proportional to the square of the rotor speed and thus the generator output power will be proportional to the cubic of the rotor speed.…”

Section: Mpptmentioning

confidence: 99%

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Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell Effect

Zhou

Scuiller

Charpentier

et al. 2013

IEEE Trans. Sustain. Energy

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Abstract-Variations of marine current speed may lead to strong fluctuations in the power extracted by a marine current turbine (MCT). During short-time period, swell effect is the main cause for the current speed variations. Conventional tip speed ratio Maximum Power Point Tracking (MPPT) algorithm will require the MCT to accelerate or to decelerate frequently under swell effect, which can cause severe fluctuations in the generator power. This paper focuses on power smoothing control of grid-connected MCT system. In the first step, a modified MPPT algorithm with filter strategy is proposed in generator-side control to mitigate the fluctuation of generator power. In the second step, Super-capacitor (SC) Energy Storage System (ESS) is added to compensate the residual power fluctuations.Simulations of a 1.5 MW direct-driven grid-connected MCT system are carried out. The swell effect is calculated based on typical system location and sea state. Detailed control strategies and SC sizing are described. The results demonstrate that the association of the generator-side filter strategy with the SC ESS system achieves a smoothed power injected to the grid in case of swell disturbances.Index Terms-Marine current turbine, power fluctuation, swell effect, power smoothing control, supercapacitor.

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Section: Mpptmentioning

confidence: 99%

“…1 shows the general system structure [13]). The swell is modeled by the Stokes model [14] and the JONSWAP spectrum.…”

mentioning

confidence: 99%

Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell Effect

Zhou

Scuiller

Charpentier

et al. 2013

IEEE Trans. Sustain. Energy

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“…For marine current speed lower than 3.2m/s, a modified MPPT strategy with filter algorithm to utilize system inertia for reducing power fluctuations under swell disturbance will be used. This method has been investigated in the previous work [8]. In this paper we will focus on the power limitation control stage at over-rated marine current speeds.…”

Section: A Marine Current Turbine Modelmentioning

confidence: 99%

“…It means that the corresponding steady state operating points are situated under the limits defined by (7) and (8). (8). The MCT required torque can be obtained by speed control strategy or torque control strategy, which will be discussed in the followed sections.…”

Section: A Flux-weakening Controlmentioning

confidence: 99%

“…Supposing that the C p curve is known and the marine current speed V can be obtained by flow velocity measurements, the rotor speed should be controlled to keep the turbine tip speed ratio at λ opt , thus keeping the turbine power coefficient C p at the maximum value when the marine current speed is below the rated value. A modified tip speed ratio based MPPT with filter algorithm is proposed in the previous work as follows [8]. …”

Section: B Speed Control Strategymentioning

confidence: 99%

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Power limitation control for a PMSG-based marine current turbine at high tidal speed and strong sea state

Zhou

Scuiller

Charpentier

et al. 2013

2013 International Electric Machines &Amp; Drives Conference

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract-This paper deals with the control strategies for a fixed-pitch marine current turbine (MCT) when the marine current speed exceeds the rated value corresponding to the rated power of generator and converter. Over-rated marine currents occur at large spring tides or under strong sea states; in these cases maximum power point tracking (MPPT) strategies must be changed to power limitation strategies for limiting the generator power at rated value. In this paper, two power limitation strategies with flux-weakening control are investigated. A feedback flux-weakening control is applied to extend the rotor speed operating range over the nominal MPPT tracking speed during high speed marine currents. In the speed control strategy, the turbine power characteristics are used to generate the rotor speed reference and the power limitation can be obtained at steady-state. In the torque control strategy, the generator torque is directly calculated by the power limitation and the rotor speed; this method enables to control the generator power at the limited value at dynamic process. Both strategies are investigated and compared at high tidal speeds without and with swell effect.Index Terms-Marine current turbine, power limitation, flux-weakening, torque control, swell effect.

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Selecting and optimal sizing of hybridized energy storage systems for tidal energy integration into power grid

Elghali

Outbib

Benbouzid

2018

J. Mod. Power Syst. Clean Energy

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The high penetration of renewable energy systems with fluctuating power generation into the electric grids affects considerably the electric power quality and supply reliability. Therefore, energy storage resources are used to deal with the challenges imposed by power variability and demand-supply balance. The main focus of this paper is to investigate the appropriate storage technologies and the capacity needed for a successful tidal power integration. Therefore, a simplified sizing method, integrating an energy management strategy, is proposed. This method allows the selection of the adequate storage technologies and determines the required least-cost storage capacity by considering their technological limits associated with different power dynamics. The optimal solutions given by the multi-objective evolutionary algorithm are presented and analyzed.

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Grid-connected marine current generation system power smoothing control using supercapacitors

Cited by 16 publications

References 7 publications

Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell Effect

Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell Effect

Power limitation control for a PMSG-based marine current turbine at high tidal speed and strong sea state

Selecting and optimal sizing of hybridized energy storage systems for tidal energy integration into power grid

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