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A Temporary Frequency Response Strategy Using a Voltage Source-Based PermanentMagnet Synchronous Generator and Energy Storage Systems

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Energy engineering 2024年第2期121卷 541-555页

作者： Baogang Chen Fenglin Miao Jing Yang Chen Qi Wenyan Ji CSIC HaiZhuangWindpower Co. Ltd.Chongqing400000China state key laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijing100000China

Energy storage systems(ESS)and permanent magnet synchronous generators(PMSG)are speculated to be able to exhibit frequency regulation capabilities by adding differential and proportional control loops with different control *** available PMSG kinetic energy and charging/discharging capacities of the ESS were *** improve the inertia response and frequency control capability,we propose a short-term frequency support strategy for the ESS and *** this end,the weights were embedded in the control loops to adjust the participation of the differential and proportional controls based on the system frequency *** effectiveness of the proposed control strategy was verified using PSCAD/*** simulations revealed that the proposed strategy could improve the maximum rate of change of the frequency nadir and maximum frequency ***,it provides a promising solution of ancillary services for frequency regulation of PMSG and ESS.

关键词： Inertial control PMSG ESS wind power generation frequency support

Reliability-Based Full-Life Cycle Optimum Design of offshore Jacket Platform

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海洋工程：英文版 2004年第1期18卷 47-58页

作者：王立成宋玉普 state key laboratory of coastal and offshore engineering

Based on the consideration of operation environment and structural property, an optimum design model of offshore jacket platform is developed in this paper, namely, the reliability-based full-life cycle optimum design model. In this model, the time-dependent reliability assessment method for structural members is established by combination of the decrease of sectional size and performance deterioration of material. The initial investment, maintenance cost and failure loss cost are assembled into the model. The total cost of the platform structure system in its full service period is chosen as the objective function, and the initial reliabilities of the layer elements partitioned in advance are taken as the design variables. Different models are obtained, depending on whether the system reliability constraint is considered or not. This optimum design model can result in the lowest full-life cost and the optimal initial layer reliability of an offshore jacket platform in the design of marine structures. The feasibility of this model is illustrated with an actual jacket platform in the Liaodong Gulf as an example.

关键词： offshore jacket platform full-life cycle optimum design model maintenance cost failure loss cost reliability

Impact Pressure of Incident Regular Waves and Irregular Waves on the Subface of Open-Piled Structures

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海洋工程：英文版 2004年第1期18卷 35-46页

作者：任冰王永学 state key laboratory of coastal and offshore engineering

This paper presents the results of comparison of impact pressures on open-plied structures induced by regular waves and irregular waves in a laboratory channel. Regular waves with wave heights ranging from 0.1～0.2 m and periods ranging from 1.0～2.0 s are tested. The target spectrum for the irregular wave is JONSWAP spectrum. Irregular waves with significant wave heights in the range of 0.10～0.25 m and peak periods in the range of 1.0～2.0 s are tested. The relative clearance s/H 1/3(H) is between -0.1 and 0.4, s being the subface level of structure model above the still water level. Time series of impact pressure are analyzed to indicate whether the property of impact pressures induced by the regular wave significantly deviates from that by the irregular wave. The distribution of the impact pressure along the underside of the structure is compared for different types of incident waves. The effects of wave parameters, structure dimension and structure clearance on the impact pressure are also discussed.

关键词： irregular wave regular wave open-piling impact pressure

Coupled dynamic response analysis of multi-column floating offshore wind turbine with low center of gravity

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Journal of Ocean engineering and Science 2024年第1期9卷 25-39页

作者： Jie Yang Yan-ping He Yong-sheng Zhao Xiao-yan Yang Guo-rong Zhang state key laboratory of Ocean engineering Shanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai Jiao Tong UniversityShanghai 200240China School of Naval Architecture Ocean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Faculty of Maritime and Transportation Ningbo UniversityNingbo 315211China

To realize the application of the floating offshore wind turbine(FOWT)from deep to relatively shallow waters,a new concept of multi-column floating wind turbine platform with low center of gravity(CG)is designed and *** multi-column low CG platform is designed to support a 6MW wind turbine class and operated at a water depth of 50m in the South China *** frequency domain software WADAM and time domain software NREL-FAST are used to simulate coupled dynamic responses of the floating wind turbine system with second-order wave loads *** dynamic behaviors of multi-column low CG FOWT system under normal operation and parked conditions are *** influence of second-order wave force on the motion responses of the multi-column platform,fore-aft force and moment of the tower base and mooring force are researched *** results demonstrate that the coupled dynamic responses at rated operating condition and extreme condition meet the normal operating requirements and extreme survival requirements of FOWT system in the shallow water(50m)of South China *** addition,it is found that,the wave frequency response gradually replaces the second-order low frequency response as the main influencing factor of the coupled dynamic response of the FOWT system with the increasing severity of the sea ***,in general,the magnitude of second-order low frequency response increases with the increasing severity of the design load ***,in the subsequent design of the shallow water FOWT system,the second-order effects should be paid enough attention.

关键词： Floating offshore wind turbine Multi-column platform Second-order wave force Concept design Coupled dynamic response

Probabilistic seismic hazard analysis in Nepal

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Earthquake engineering and engineering Vibration 2013年第4期12卷 577-586页

作者： Thapa Dilli Ram Wang Guoxin state key laboratory of coastal and offshore engineering Dalian University of Technology

The seismic ground motion hazard for Nepal has been estimated using a probabilistic approach. A catalogue of earthquakes has been compiled for Nepal and the surrounding region （latitude 26% N and 31.7% N and longitude 79° E and 90° E） from 1255 to 2011. The distribution of catalogued earthquakes, together with available geological and tectonic information were used to delineate twenty-three seismic source seismic source information and probabilistic earthquake hazard prediction relationship, peak ground accelerations （PGAs） have zones in Nepal and the surrounding region. By using the parameters in conjunction with a selected ground motion been calculated at bedrock level with 63%, 10%, and 2% probability of exceedance in 50 years. The estimated PGA values are in the range of 0.07-0.16 g, 0.21 0.62 g, and 0.38-1.1 g for 63%, 10%, and 2% probability of exceedance in 50 years, respectively. The resulting ground motion maps show different characteristics of PGA distribution, i.e., high hazard in the far-western and eastern sections, and low hazard in southern Nepal. The quantified PGA values at bedrock level provide information for microzonation studies in different parts of the country.

关键词： seismic hazard assessment peak ground acceleration earthquake Nepal Himalaya

Underwater Gas Leakage Flow Detection and Classification Based on Multibeam Forward-Looking Sonar

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哈尔滨工程大学学报（英文版） 2024年第3期23卷 674-687页

作者： Yuanju Cao Chao Xu Jianghui Li Tian Zhou Longyue Lin Baowei Chen Southampton Ocean engineering Joint Institute Harbin Engineering UniversityHarbin 150001China College of Underwater Acoustic engineering Harbin Engineering UniversityHarbin 150001China National key laboratory of Underwater Acoustic Technology Harbin Engineering UniversityHarbin 150001China key laboratory of Marine Information Acquisition and Security(Harbin engineering University) Ministry of Industry and Information TechnologyHarbin 150001China state key laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China

The risk of gas leakage due to geological flaws in offshore carbon capture, utilization, and storage, as well as leakage from underwater oil or gas pipelines, highlights the need for underwater gas leakage monitoring technology. Remotely operated vehicles(ROVs) and autonomous underwater vehicles(AUVs) are equipped with high-resolution imaging sonar systems that have broad application potential in underwater gas and target detection tasks. However, some bubble clusters are relatively weak scatterers, so detecting and distinguishing them against the seabed reverberation in forward-looking sonar images are challenging. This study uses the dual-tree complex wavelet transform to extract the image features of multibeam forward-looking sonar. Underwater gas leakages with different flows are classified by combining deep learning theory. A pool experiment is designed to simulate gas leakage, where sonar images are obtained for further processing. Results demonstrate that this method can detect and classify underwater gas leakage streams with high classification accuracy. This performance indicates that the method can detect gas leakage from multibeam forward-looking sonar images and has the potential to predict gas leakage flow.

关键词： Carbon capture utilization and storage(CCUS) Gas leakage Forward-looking sonar Dual-tree complex wavelet transform(DT-CWT) Deep learning

Experimental Study of Nonlinear Behaviors of A Free-Floating Body in Waves

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China Ocean engineering 2016年第3期30卷 421-430页

作者：贺铭任冰邱大洪 state key laboratory of coastal and offshore engineering Dalian University of Technology

Nonlinear behaviors of a free-floating body in waves were experimentally investigated in the present study. The experiments were carried out for 6 different wave heights and 6 different wave periods to cover a relatively wide range of wave nonlinearities. A charge-coupled device （CCD） camera was used to capture the real-time motion of the floating body. The measurement data show that the sway, heave and roll motions of the floating body are all harmonic oscillations while the equilibrium position of the sway motion drifts in the wave direction. The drift speed is proportional to wave steepness when the size of the floating body is comparable to the wavelength, while it is proportional to the square of wave steepness when the floating body is relatively small. In addition, the drift motion leads to a slightly longer oscillation period of the floating body than the wave period of nonlinear wave and the discrepancy increases with the increment of wave steepness.

关键词： floating body nonlinear wave motion trajectory drift speed oscillation period

Longshore Currents over Barred Beach with Mild Slope

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China Ocean engineering 2016年第2期30卷 193-204页

作者：王彦邹志利 state key laboratory of coastal and offshore engineering Dalian University of Technology

The laboratory experiment and numerical simulations of wave-driven longshore currents by random waves on barred beaches with slopes of 1：100 and 1：40 were conducted to investigate the bimodal feature of mean longshore currents,with emphasis on the location and ratio of two peaks of longshore *** location and ratio of two peaks are controlled by the sand *** influences of wave heights and beach slopes on the longshore currents are *** simulations were also performed to compute the measured velocity profile,with the emphasis on the effect of lateral mixing,bottom friction and surface rollers on numerical results.

关键词： barred beach bimodal feature second peak modeling

A Piston-Type Active Absorbing Wavemaker System with Delay Compensation

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China Ocean engineering 2015年第6期29卷 917-924页

作者：杨洪齐李木国柳淑学张群王静 state key laboratory of coastal and offshore engineering Dalian University of Technology

Physical model tests with highly reflective structures often encounter a problem of multiple reflections between the structures and the wavemaker. This paper presents a piston-type active absorbing wavemaker system which can absorb most of the reflections. Based on the first-order wavemaker theory, a frequency domain absorption transfer function is modeled. Its time realization can be achieved by designing an IIR digital filter, which is used to control the absorbing wavemaker system. In a real system, time delays often exist in the wave making process. Thus a delay compensation term to the transfer function is proposed. Experimental results show that the system performs well for both regular and irregular waves with periods from 0.6 s to 2.0 s, and the absorption capability is larger than 96.5% at target wave fields.

关键词： wavemaker active absorption IIR digital filter time delay