Research And Application Of Overall Development Program For Hybrid Marine Energy Intelligent Power Supply System

In recent years, the development and utilization of marine energy is one of the hotissues at home and abroad. Scholars from various countries focus on the research anddevelopment of marine energy devices and lots of new types of devices have emerged.However, there are many bottlenecks problems to be solved, such as unstable powergeneration, hard to be incorporated into the grid, lack of test platforms at sea, as well as lackof uniform device performance evaluation methods. Considering the unsettled problemsabove and the status of low marine energy flow density in China, the hybrid marine energyintelligent power supply system is proposed. The hybrid marine energy intelligent powersupply system can comprehensively utilize the cross-changing marine energy and convertthe multiple unstable power input into single stable power output, which can supply powerfor island inhabits or incorporate the electricity power into the grid. The hybrid marineenergy intelligent power supply system can solve the bottleneck problems in marine energypower generation, and promote the industrialization process of marine energy in ourcountry.The paper mainly studies on the key technologies of hybrid marine energy intelligentpower supply system, and explores universally applicable methods and theories, which areused in the construction practice of500kW marine stand-alone power system demonstrationproject. The key technologies include the following four aspects: the establishment ofresources assessment methods applicable for the hybrid marine energy intelligent powersupply system; the establishment of the method for site alternatives comparison; theestablishment of type selection parameters and layout parameters of marine energygeneration devices; the overall design of the hybrid marine energy intelligent power supplysystem. Meanwhile, the development process for the hybrid marine energy intelligent powersupply system is also determined. The main contents of this paper commence around thekey technologies and the development process.The resource assessment stage has been determined according to the development process, as well as the resource assessment contents. Then the resources surveymethodology, the accuracy requirements as well as description methods of survey results atdifferent stages are given. Some other elements have also been determined, such as resourceconditions analysis methods, including forecasting methods and accuracy requirements,data analysis parameters and calculation methods, resource conditions estimation methodsand resource assessment methods.The calculation method of improved Analytic Hierarchy Process has been proposedunder the basis of traditional Analytic Hierarchy Process and it has been verified to becorrect and simple through an example of the comparison of a wharf’s plane layoutalternatives. The universal calculation program is given in order to promote the use ofimproved Analytic Hierarchy Process in engineering fields. The evaluation index system isestablished and the different standardization methods are proposed considering theconfusion of qualitative and quantitative indicators, dimensional inconsistencies, as well asevaluation orientation inconsistencies. At last, the improved Analytic Hierarchy Process isapplied to the site selection of hybrid marine energy intelligent power supply system, and afour-level hierarchical model is built.The type selection parameters of marine energy device are determined by the way ofidentifying various tidal current energy generation devices and wave power generationdevices at home and abroad, which can provide basic information for the device selection.Meanwhile, the layout parameters of marine energy device are identified too, which cansupply guidance for the station site selection and the layout plan determination.The hybrid marine energy intelligent power supply system is composed of powergeneration unit, cable, as well as the central control room. The overall design has beengiven for the following items, such as communication and connection method, offshore logoof submerged installation, submarine cable and land cable, the central control room powersystem, metering equipment, auxiliary equipment and other equipment, etc. Meanwhile, thedesign method, design content and optimization program have also been presented.The500kW marine stand-alone power system is a demonstration project of hybridmarine energy intelligent power supply system constructed at Zhaitang island of Qingdaocity. The socio-economic conditions and environmental constraints for Zhaitang island have been investigated by data collection, such as location, function zoning, island area,population and population distribution, power source, etc. The elements of the naturalconditions of Zhaitang island are investigated by field measurement and data collection,such as water depth, topography, tides, geology, land conditions, weather conditions andwave. According to the annual wind and wave extreme value sequences of Xiaomai islandduring the year1983to2005, the wind speed extreme value, wave height extreme value andwave period extreme value of multiple year return period are calculated and the wave fieldnear Zhaitang island is simulated using the SWAN model. The wind and wave extremevalues of multiple year return period are the basis for the structural design of the tidalcurrent energy generation devices. The tidal current resource assessment is divided into twostages which are the island assessment and the station site assessment. The survey of thetidal current resources is conducted by simultaneous observation, moving vesselobservation and fixed-point observation, and the harmonic analysis is done using differentharmonic constants. Then the COHEREN-SED model and the Delft3D model are used tosimulate the tidal current field and the calculation results show good consistency withobservational data. At last, the station site for tidal current energy generation devices andthe layout plan are determined according to the calculation results. In addition, the type ofthe100kW tidal current energy generation device is determined, and the preliminary designfor the device is completed through numerical simulation and physical model tests,obtaining the final design parameters.