共查询到19条相似文献，搜索用时 109 毫秒
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将海工构筑物作为海洋能获能装置的安装载体可大幅降低海洋能发电的成本,同时,海工构筑物等海上设施客观上存在利用海洋能实现能量供应的需求,因此海洋能发电装置与海工构筑物相互结合具有良好的综合效益,将是未来海洋能利用的一个发展方向。针对波浪能和潮流能两种海洋能发电方式,分别对柔性叶片潮流能水轮机与进海路集成利用技术;垂直轴和水平轴潮流能水轮机以及振荡浮子式波能装置与导管架石油平台集成利用技术;OWC波能装置与沉箱防波堤集成利用技术进行了探讨,并提出海工构筑物海洋能集成利用技术中需要解决的几点问题。 相似文献
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The dearth of generally available, failure data that can be directly applied to marine energy converters (MECs) has been commented on for some years. The advancement of the industry will be fundamentally linked to proven reliability assessments, which is difficult on an industry wide basis. This paper describes how targeted component reliability testing could enable the establishment of relevant failure rate data for the marine renewable energy industry. The necessity of dedicated component testing is briefly reviewed for the wave energy sector together with the experience from other industries. A generic procedure used in test intensive industries for service simulation testing is outlined and applied to wave tank mooring tests. By means of a rainflow analysis procedure and the Palmgren–Miner rule the most severe load cycles, largely contributing to the fatigue damage are identified and reproduced for a possible component test signal. The application of the suggested generic test approach will assist marine energy stakeholders in obtaining evidence of component reliability under simulated operational conditions much more rapidly than can be achieved with prototypes under normal service conditions. Importantly, this would also allow a more accurate estimate of field failure rates and could reveal possible failure modes/design weaknesses ahead of field deployments. 相似文献
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稠油黏度高,流动性差,常规测试难以正确评价储层的真实产能。随着多元热流体热采技术在海上油田生产平台的成功应用,提出了在探井测试中应用多元热流体热采技术。通过对支撑平台的适应性分析研究,运用数值模拟方法预测多元热流体热采测试的开采效果,并对相应的井口、供给方式等进行了优化研究。通过现场实施,多元热流体热采测试的日产油量可达常规冷采测试产油量的2倍以上,实际效果与数值模拟的结果基本相当。该技术的应用更能准确反映油田的真实产能,为海上稠油油田的探井测试提供了一个新方法。 相似文献
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An increasing number of experiments are being conducted to study the design and performance of wave energy converters. Often in these tests, a real-time realization of prospective control algorithms is applied in order to assess and optimize energy absorption as well as other factors. This paper details the design and execution of an experiment for evaluating the capability of a model-scale WEC to execute basic control algorithms. Model-scale hardware, system, and experimental design are considered, with a focus on providing an experimental setup capable of meeting the dynamic requirements of a control system. To more efficiently execute such tests, a dry bench testing method is proposed and utilized to allow for controller tuning and to give an initial assessment of controller performance; this is followed by wave tank testing. The trends from the dry bench test and wave tank test results show good agreement with theory and confirm the ability of a relatively simple feedback controller to substantially improve energy absorption. Additionally, the dry bench testing approach is shown to be an effective and efficient means of designing and testing both controllers and actuator systems for wave energy converters. 相似文献
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针对水平轴单叶轮海流机在低流速时启动性能差、获能少的缺点,采用共水平轴同向旋转双叶轮水轮机进行了水动力学性能的水槽试验.由实验结果研究了共水平轴单叶轮和双叶轮水轮机的功率特性和启动特性,分析了不同上、下游叶轮安装角和叶轮轴向间距对叶轮启动水流速度以及发电机获得功率的影响,并对单叶轮和双叶轮水轮机的运行情况进行了比较.结果表明,共水平轴双叶轮水轮机的启动水流速度较单叶轮低很多,而且能从水流中获得更多的能量.因此,共水平轴双叶轮水轮机能改进一般水平轴单叶轮水轮机难以启动和获能少的不足,更适合于我国低海流流速的实际海况. 相似文献
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Modelling and control of oscillating-body wave energy converters with hydraulic power take-off and gas accumulator 总被引：1，自引：0，他引：1
Antnio F. de O. Falco 《Ocean Engineering》2007,34(14-15):2021-2032
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Floating oscillating bodies constitute a large class of wave energy converters, especially for offshore deployment. Usually the Power-Take-Off (PTO) system is a directly linear electric generator or a hydraulic motor that drives an electric generator. The PTO system is simplified as a linear spring and a linear damper. However the conversion is less powerful with wave periods off resonance. Thus, a nonlinear snap-through mechanism with two symmetrically oblique springs and a linear damper is applied in the PTO system. The nonlinear snap-through mechanism is characteristics of negative stiffness and double-well potential. An important nonlinear parameter is defined as the ratio of half of the horizontal distance between the two springs to the original length of both springs. Time domain method is applied to the dynamics of wave energy converter in regular waves. And the state space model is used to replace the convolution terms in the time domain equation. The results show that the energy harvested by the nonlinear PTO system is larger than that by linear system for low frequency input. While the power captured by nonlinear converters is slightly smaller than that by linear converters for high frequency input. The wave amplitude, damping coefficient of PTO systems and the nonlinear parameter affect power capture performance of nonlinear converters. The oscillation of nonlinear wave energy converters may be local or periodically inter well for certain values of the incident wave frequency and the nonlinear parameter , which is different from linear converters characteristics of sinusoidal response in regular waves. 相似文献
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Wave energy fluctuating a great deal endangers the security of power grid especially micro grid in island. A DC nano grid supported by batteries is proposed to smooth the output power of wave energy converters (WECs). Thus, renewable energy converters connected to DC grid is a new subject. The characteristics of WECs are very important to the connection technology of HPTO type WECs and DC nano grid. Hydraulic power take-off system (HPTO) is the core unit of the largest category of WECs, with the functions of supplying suitable damping for a WEC to absorb wave energy, and converting captured wave energy to electricity. The HPTO is divided into a hydraulic energy storage system (HESS) and a hydraulic power generation system (HPGS). A primary numerical model for the HPGS is established in this paper. Three important basic characteristics of the HPGS are deduced, which reveal how the generator load determines the HPGS rotation rate. Therefore, the connector of HPTO type WEC and DC nano grid would be an uncontrollable rectifier with high reliability, also would be a controllable power converter with high efficiency, such as interleaved boost converter-IBC. The research shows that it is very flexible to connect to DC nano grid for WECs, but bypass resistance loads are indispensable for the security of WECs.. 相似文献
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信息技术的快速发展,带动海洋数据快速积累,海洋已经进入大数据时代。海洋大数据即是在当前大数据时代背景下,大数据技术在海洋领域的科学实践,具有大体量(Volume)、多样性(Variety)、快速流转(Velocity)和高价值(Value)的"4V"特征,是在大数据的理论指导和技术支撑下的价值实现,也是实施海洋强国战略、开发海洋资源、拉动海洋经济、维护国家海洋权益的重要基础。本文讨论了海洋大数据的内涵和外延,从数据特征、数据种类的角度对海洋大数据进行了全面的定义;并详细介绍了海洋大数据的应用领域;进一步阐述了海洋大数据平台建设的关键技术问题及其在海洋大数据服务平台实例中的应用;从数据共享、数据管理和数据安全的角度,探讨了海洋大数据面临的挑战和机遇;最后对未来海洋大数据的发展趋势和方向进行了展望。 相似文献
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《海洋技术学报》2023,(1)
本文以表层漂流浮标、漂流式波浪浮标和漂流式海气界面浮标为代表介绍了无动力海面移动观测平台的观测需求、特点、最新进展和发展趋势。无动力海面移动观测平台除具备重量轻、体积小、随波性好等特点外,相比其他观测平台最大的优势在于成本低、实时性强,可有效弥补定点观测在全球大洋空间分辨率的不足。随着海洋与气象环境观测传感器的自动化、小型化和低功耗化,尤其是在可再生能源供应和卫星数据通讯技术的支撑下,这一类型平台观测能力的可拓展性非常强。除可直接开展海洋环境声学、光学和电磁学要素的观测外,还可成为海洋化学、海洋生物、海洋地质等海洋学科的专属平台,并具备海上目标探测识别能力。随着无动力海面移动平台观探测能力的不断提高、使用成本的降低和快速投放技术的发展,此类平台在海洋观探测领域尤其是深远海区域观探测快速响应方面将有非常广阔的应用前景。 相似文献