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公开(公告)号：US10423126B2
公开(公告)日：2019-09-24
申请号：US15830752
申请日：2017-12-04
申请人： National Technology & Engineering Solutions of Sandia, LLC , Rush D. Robinett, III , Ossama Abdelkhalik , Jiajun Song
摘要： A multi-resonant wide band controller decomposes the wave energy converter control problem into sub-problems; an independent single-frequency controller is used for each sub-problem. Thus, each sub-problem controller can be optimized independently. The feedback control enables actual time-domain realization of multi-frequency complex conjugate control. The feedback strategy requires only measurements of the buoy position and velocity. No knowledge of excitation force, wave measurements, nor wave prediction is needed. As an example, the feedback signal processing can be carried out using Fast Fourier Transform with Hanning windows and optimization of amplitudes and phases. Given that the output signal is decomposed into individual frequencies, the implementation of the control is very simple, yet generates energy similar to the complex conjugate control.
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公开(公告)号：US20180164754A1
公开(公告)日：2018-06-14
申请号：US15830752
申请日：2017-12-04
申请人： Rush D. Robinett, III , Ossama Abdelkhalik , Jiajun Song , National Technology & Engineering Solutions of Sandia, LLC
摘要： A multi-resonant wide band controller decomposes the wave energy converter control problem into sub-problems; an independent single-frequency controller is used for each sub-problem. Thus, each sub-problem controller can be optimized independently. The feedback control enables actual time-domain realization of multi-frequency complex conjugate control. The feedback strategy requires only measurements of the buoy position and velocity. No knowledge of excitation force, wave measurements, nor wave prediction is needed. As an example, the feedback signal processing can be carried out using Fast Fourier Transform with Hanning windows and optimization of amplitudes and phases. Given that the output signal is decomposed into individual frequencies, the implementation of the control is very simple, yet generates energy similar to the complex conjugate control.
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公开(公告)号：US20180163690A1
公开(公告)日：2018-06-14
申请号：US15837853
申请日：2017-12-11
申请人： Ossama Abdelkhalik , Shangyan Zou , Rush D. Robinett, III , National Technology & Engineering Solutions of Sandia, LLC
发明人： Ossama Abdelkhalik , Giorgio Bacelli , Shangyan Zou , Rush D. Robinett, III , David G. Wilson , Ryan G. Coe
CPC分类号： F03B13/183 , F03B13/16 , F03B15/00 , F03B15/20 , F05B2250/43 , F05B2270/20 , G02F1/39 , G06F1/02 , G06F1/022 , H01J49/4275 , Y02E10/38
摘要： The invention provides optimal control of a three-degree-of-freedom wave energy converter using a pseudo-spectral control method. The three modes are the heave, pitch and surge. A dynamic model is characterized by a coupling between the pitch and surge modes, while the heave is decoupled. The heave, however, excites the pitch motion through nonlinear parametric excitation in the pitch mode. The invention can use a Fourier series as basis functions to approximate the states and the control. For the parametric excited case, a sequential quadratic programming approach can be implemented to numerically solve for the optimal control. The numerical results show that the harvested energy from three modes is greater than three times the harvested energy from the heave mode alone. Moreover, the harvested energy using a control that accounts for the parametric excitation is significantly higher than the energy harvested when neglecting this nonlinear parametric excitation term.
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4.发明申请公开(公告)号：US20180163691A1
公开(公告)日：2018-06-14
申请号：US15837885
申请日：2017-12-11
申请人： Ossama Abdelkhalik , Rush D. Robinett, III , Shangyan Zou , Umesh Korde , National Technology & Engineering Solutions of Sandia, LLC
发明人： Ossama Abdelkhalik , Rush D. Robinett, III , Shangyan Zou , David G. Wilson , Giorgio Bacelli , Umesh Korde , Ryan G. Coe
CPC分类号： F03B13/183 , F03B13/16 , F03B15/00 , F05B2250/43 , F05B2270/20 , G06F1/02 , G06F1/022 , Y02E10/38
摘要： A parametric excitation dynamic model is used for a three degrees-of-freedom (3-DOF) wave energy converter. Since the heave motion is uncoupled from the pitch and surge modes, the pitch-surge equations of motion can be treated as a linear time varying system, or a linear system with parametric excitation. In such case the parametric exciting frequency can be tuned to twice the natural frequency of the system for higher energy harvesting. A parametric excited 3-DOF wave energy converter can harvest more power, for both regular and irregular waves, compared to the linear 3-DOF. For example, in a Bretschneider wave, the harvested energy in the three modes is about 3.8 times the energy harvested in the heave mode alone; while the same device produces about 3.1 times the heave mode energy when using a linear 3-DOF model.
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公开(公告)号：US20180164755A1
公开(公告)日：2018-06-14
申请号：US15830770
申请日：2017-12-04
申请人： Ossama Abdelkhalik , Shangyan Zou , Rush D. Robinett, III , Umesh Korde , National Technology & Engineering Solutions of Sandia, LLC
发明人： Ossama Abdelkhalik , Shangyan Zou , Rush D. Robinett, III , David G. Wilson , Giorgio Bacelli , Ryan Geoffrey Coe , Umesh Korde
CPC分类号： G05B11/38 , F03B13/16 , F03B13/22 , F03B15/00 , F05B2240/93 , F05B2250/231 , F05B2250/241 , F05B2250/43 , F05B2270/20 , G06F17/142 , Y02E10/38
摘要： Multi-resonant control of a 3 degree-of-freedom (heave-pitch-surge) wave energy converter enables energy capture that can be in the order of three times the energy capture of a heave-only wave energy converter. The invention uses a time domain feedback control strategy that is optimal based on the criteria of complex conjugate control. The multi-resonant control can also be used to shift the harvested energy from one of the coupled modes to another, enabling the elimination of one of the actuators otherwise required in a 3 degree-of-freedom wave energy converter. This feedback control strategy does not require wave prediction; it only requires the measurement of the buoy position and velocity.
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公开(公告)号：US10090764B1
公开(公告)日：2018-10-02
申请号：US15867276
申请日：2018-01-10
申请人： National Technology & Engineering Solutions of Sandia, LLC , Wayne W. Weaver , Rush D. Robinett, III , Ronald Matthews
摘要： A Hamiltonian surface shaping power flow control (HSSPFC) method is used to analyze the meta-stability and adjust pulsed power loads on a DC electric power distribution network. Pulsed power loads are nonlinear, time-variant systems that cause nonlinear limit-cycles. During the on periods of a pulsed load, the system can be in an unstable state and is damped back to stability during the off state of the load. Therefore, over the entire period of the pulse the system may only be assessed as meta-stable. As shown through simulation, HIL and hardware results, the HSSPFC method is more accurate than the other small-signal approaches, such as Eigenvalues, Nyquist, and Floquet theory, and can reveal important details about the transient responses and performance.
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公开(公告)号：US20230265822A1
公开(公告)日：2023-08-24
申请号：US17675064
申请日：2022-02-18
发明人： David G. Wilson , Raymond H. Byrne , Steven F. Glover , Tu Anh Nguyen , Rush D. Robinett, III , Wayne W. Weaver , Madelyn G. Veurink
CPC分类号： F03B13/1885 , H02J3/381 , H02J3/48 , H02J2300/20
摘要： One of the biggest challenges for all renewable energy sources (RES) is that they are variable power generators which will require reactive power or energy storage systems (ESS) to provide reliable power quality (ideally power factor of one) at the power grid generation side. The present invention is directed to a power packet network (PPN) for integrating wave energy converter (WEC) arrays into microgrids. Specifically, an array of WECs can be physically positioned such that the incoming regular waves will produce an output emulating an N-phase AC system such that the PPN output power is constant. ESS requirements are thereby minimized whilst maintaining grid stability with high power quality. This will enable RES integration onto a future smart grid for large-scale adoption and cost reduction while preserving high efficiency, reliability, and resiliency.
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公开(公告)号：US11725622B1
公开(公告)日：2023-08-15
申请号：US17675064
申请日：2022-02-18
发明人： David G. Wilson , Raymond H. Byrne , Steven F. Glover , Tu Anh Nguyen , Rush D. Robinett, III , Wayne W. Weaver , Madelyn G. Veurink
CPC分类号： F03B13/1885 , H02J1/106 , H02J3/381 , H02J3/48 , H02J7/34 , H02J2300/20
摘要： One of the biggest challenges for all renewable energy sources (RES) is that they are variable power generators which will require reactive power or energy storage systems (ESS) to provide reliable power quality (ideally power factor of one) at the power grid generation side. The present invention is directed to a power packet network (PPN) for integrating wave energy converter (WEC) arrays into microgrids. Specifically, an array of WECs can be physically positioned such that the incoming regular waves will produce an output emulating an N-phase AC system such that the PPN output power is constant. ESS requirements are thereby minimized whilst maintaining grid stability with high power quality. This will enable RES integration onto a future smart grid for large-scale adoption and cost reduction while preserving high efficiency, reliability, and resiliency.
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公开(公告)号：US20220252039A1
公开(公告)日：2022-08-11
申请号：US17723690
申请日：2022-04-19
IPC分类号： F03B13/20
摘要： A nonlinear control design technique capitalizes on a wave energy converter comprising a shaped buoy having a variable geometry wave energy. For example, the shaped buoy can have an hourglass (HG) geometry having a variable cone or steepness angle. The HG buoy is assumed to operate in the heave motion of the wave. The unique interaction between the HG buoy and the wave creates a nonlinear cubic storage effect that produces actual energy storage or reactive power during operation. A multi-frequency Bretschneider spectrum wave excitation input was simulated for the HG design both with constant and varying steepness angle profiles which demonstrated further increased power generation with changing sea states for the variable design.
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公开(公告)号：US11316363B2
公开(公告)日：2022-04-26
申请号：US17038187
申请日：2020-09-30
摘要： Pulsed power loads (PPLs) are highly non-linear and can cause significant stability and power quality issues in an electrical microgrid. According to the present invention, many of these issues can be mitigated by an Energy Storage System (ESS) that offsets the PPL. The ESS can maintain a constant bus voltage and decouple the generation sources from the PPL. For example, the ESS specifications can be obtained with an ideal, band-limited hybrid battery and flywheel system.
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