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Kreuz Subsea appointed Thomas Liew CFO, marking the completion of the company’s reorganization phase of its international growth strategy. He has more than 20 years’ experience in senior financial positions, leading multientity organizations in the Asia Pacific region and has been instrumental in driving growth and profitability through the implementation of key operating structures. Liew's previous roles include VP finance at Alstom Grid where he was CFO for Alstom's EPC business in the Asia Pacific region. Prior to that, he also held key finance and strategy positions with Sony Electronics Asia Pacific Pte Ltd, and SingTel Ltd.
Abstract The increase in the use of electricity to power subsea processes is expected to continue through this decade. To provide the power necessary to operate a network of production equipment, a Joint Industry Project has been established to develop a transmission, distribution and control system capable of operating at depths of up to 3000m. With the capacity to deliver up to 30MVA, it is anticipated that this will meet the demand for electrical power in the foreseeable future. Key to the success of the programme is the development of a reliable, subsea mateable connector that can operate at system voltages up to 36kV but that has been tested to 76kV. This is a new requirement for a wet mateable power connector that has not been realised previously. The programme to develop the connector commenced in September 1999 and this paper describes the progress so far. Introduction The last five years have shown a marked increase in the use of electricity to power subsea processes. Recent concepts have seen the development of systems using electricity to drive downhole pumps; subsea separators & injectors; multi-phase pumps and flowline heating systems, all of which are designed to improve performance and make production more economical. Such measures are becoming increasingly important as operators strive to remain competitive by reducing production costs. As the oil and gas industry gains more experience in the use of electrical systems subsea, the application of such systems to achieve process improvements and cost savings is expected to proliferate. Even now, operators are exploring the possibility of relocating topside processing equipment to the sea floor to take advantage of proximity to the wellhead. Allied with this is the opportunity to exploit wells at long stepout distances using existing infrastructure rather than expending large amounts of capital on a network of new platforms. In this case the concept of the all-electric well is conceived, with auxiliary power being used to drive actuators and chokes on the tree. In anticipation of this increase in demand for electricity subsea, a Joint Industry Project (JIP) was formed in 1995 to assess the feasibility of operating a control and distribution system on the seabed. The project, known as SPEED (Subsea Power Electrical Equipment Demonstrator) was led by ALSTOM and culminated in the development of a 1MW system capable of operating at depths of up to 300m. This system used a Tronic 11kV three-phase, wet-mate connector to make the connection between the umbilical and the distribution system. However, as the potential applications for subsea power distribution emerged, it became apparent that variable speed drives would be required that were capable of operating motors with outputs up to 2.5MW. This has resulted in a considerable escalation in the total demand for subsea power to the extent that schemes have been proposed for which the total load is 30MVA. It also became apparent that the deployment depth would need to be increased. Hence, the original SPEED concept required enhancement to meet these increased requirements.
Abstract The paper describes the design and testing of an induction motor. The design for this machine, which is to produce 1500 hp continuously, was first calculated using a conventional equivalent circuit with analytically derived parameters. 2D finite element analysis was then used to obtain an optimum result. A thermal lumped circuit program was also employed to predict the temperature of the winding. Experimental results are given to validate the work. Introduction The AC drive system has been designed to meet the rugged demands of marine and drilling applications, the system replaces an earlier DC machine drive and employs the OEMV3000 [1] - Active Energy Management Drive to give virtually zero harmonic distortion of supply current and unity power factor. Many things can affect the smooth running of a process and produce adverse process conditions. In the past, the self-protection philosophy of variable speed drives resulted in drive tripping or shutting down. The level of intelligence and protection in the OEMV3000 means that these self-protecting trips are no longer necessary. This new drive system (Fig. 1.) can take intelligent action in the event of adverse process conditions, resulting in higher plant availability and warning of process problems before they occur. Motor Construction The machine has 6 poles. The double layer 10/12 corded stator winding is accommodated in 72 slots. The stator laminations are made from Losil material. Class H inverter grade wire is used so as to withstand the sharp impulse repetitive waveforms produced from the switching process at high frequencies. The rotor has 84 slots and carries copper bars. Fig. 1 The AC drive system(AVAIALBLE IN FULL PAPER) Design Strategy. This depends on the iteration between the electromagnetic equivalent circuit algorithm and the lumped circuit thermal design algorithm. These two packages are based on analytical methods and enable many design ideas to be examined in a short period of time. The aim is to try to optimise the overall design. The electromagnetic and thermal designs need to be considered at the same time because they are interdependent; the losses being dependent upon the temperature and the temperature on the losses. Electromagnetic finite element analysis is used to fine-tune the design. It enables the precise flux distribution and saturation levels to be determined and improves the accuracy of the predicted performance. A photograph of this new motor is shown in Fig.2.
OC5 Project Phase I: Validation of Hydrodynamic Loading on a Fixed Cylinder
Robertson, Amy N. (National Renewable Energy Laboratory,) | Wendt, Fabian F. (National Renewable Energy Laboratory,) | Jonkman, Jason M. (National Renewable Energy Laboratory,) | Popko, Wojciech (Fraunhofer IWES) | Vorpahl, Fabian (Fraunhofer IWES) | Stansberg, Carl Trygve (Vorpahl Wind Engineering Consultants) | Bachynski, Erin E. (MARINTEK) | Bayati, Ilmas (MARINTEK) | Beyer, Friedemann (Politecnico di Milano) | de Vaal, Jacobus B. (University of Stuttgart) | Harries, Rob (Institute for Energy Technology) | Yamaguchi, Atshushi (DNV GL) | Shin, Hyunkyoung (University of Tokyo) | Kim, Byungcheol (University of Ulsan) | van der Zee, Tjeerd (University of Ulsan) | Bozonnet, Pauline (Knowledge Centre WMC) | Aguilo, Borja (IFP Energies nouvelles) | Bergua, Roger (Alstom Wind) | Qvist, Jacob (Alstom Wind) | Qijun, Wang (Subsea) | Chen, Xiaohong (Dongfang Turbine Co.) | Guerinel, Matthieu (ABS) | Tu, Ying (WavEC Offshore Renewables) | Yutong, Huang (Norwegian University of Science and Technology) | Li, Rongfu (Chinese General Certification) | Bouy, Ludovic (Goldwind)
The This paper describes work performed during the first half of Phase I of project will examine three structures using data from both floating and the Offshore Code Comparison Collaboration Continuation, with fixed-bottom systems, and from both scaled tank testing and full-scale, Correlation project (OC5). OC5 is a project run under the International open-ocean testing. Energy Agency Wind Research Task 30, and is focused on validating the tools used for modeling offshore wind systems. In this first phase, The first phase of OC5 is focused on examining the hydrodynamic simulated responses from a variety of offshore wind modeling tools loads on fixed cylinders. No wind turbine is present in these tests were validated against tank test data of a fixed, suspended cylinder because the purpose is to examine hydrodynamic loads only, before (without a wind turbine) that was tested under regular and irregular moving on to the complexity of coupled wind/wave loads and dynamic wave conditions at MARINTEK. The results from this phase include an system response. Because this is the first time the group has used examination of different approaches one can use for defining and measured test data, a simple structure is chosen to ease into the calibrating hydrodynamic coefficients for a model, and the importance complications involved when using real data. The first phase was also of higher-order wave models in accurately modeling the hydrodynamic used to develop the model calibration and validation processes that will loads on offshore substructures.
- Europe (1.00)
- North America > United States (0.47)
Oilfield services provider Petrofac named Allan Cockriel chief information officer. Cockriel joins the company from GE, where he was responsible for IT and service delivery for the combined GE Power/Alstom Global Parts Fulfillment IT organization. During his 14 years at GE, he also worked in areas of international IT leadership, global restructuring and business transformation, senior operations management, emerging markets' growth, and joint ventures.