Cooling System Study For Transformer Substation Of Offshore Wind Power Station

Guangdong province is one of the most developed areas along the coast of Chinafor which it has great demand of power and electricity. Due to the lacking of energyresources, Guangdong has the dilemma of energy supply. Thus, transferring powerfrom offshore wind farms to coastal power load center could be an effective way toeliminatethe power demand shortage of economic development within the province.Additionally, like other forms of renewable energy, offshore wind energy can lead tothe reducing of the fossil fuels consumption and pollution. As the report “TheOffshore Wind Farm Planning of Guangdong Province” mentioned, Guangdong hasrich offshore wind resources and good condition for absorption of power grid, thusoffshore wind power would become a fast growing form of renewable energysupplying to the province.The offshore wind power has been developed for over a decade in Europe.However the development experience cannot be fully adopted in Chinese offshorewind energy due to the differences of marine and climate conditions. For instance,Guangdong has subtropical special weather and climate conditions, such as salt fog,high temperature, high humidity, typhoon and other challenging factors that willeventually increase the difficulties in offshore wind farm development. Therefore,researching and mitigating the challenges in offshore wind farm development ofGuangdong are significant, for which improving the reliability of offshore windenergy system and effectively cutting down the cost of construction, operating andmaintaining are practical measures.Offshore booster station is a key facility for offshore wind energy transmittal.The operational stability and safety issues are essential elements to ensure safety andreliability of an offshore wind farm. Enormous heat will be released during theoperation of the equipment in the booster station, which include transformer,distribution devices, control system,etc. Therefore a robust ventilation and airconditioning cooling system will be important and necessary.In this thesis, based on the application of the theories in heat transfer, thermodynamics, refrigeration technology, and air conditioning technology, so of thedata obtained from REFPROP Ver.9.0database of the American National StandardsInstitute (ANSI) and the Chinese costal hydrological&meteorological stations,different cooling methodologies are discussed. This research has further employedoptimization method and computer simulation technique to investigate the coolingload in operation, characterization of the booster station generator structure. Also theLumped Parameter Method is adopted to calculate different types of air conditioningrefrigeration cycle performance models (compressor performance model, evaporatorperformance model, the air-cooled condenser performance model). These models aremodified with consideration of the reference to the performance characteristics oftypical air-cooled air conditioner.The research objectives are indicated as follows:1. Simulation based on the Lumped Parameter Method for air conditioner;2. Study of performance variations of air-cooling and water-cooling systems indifferent environment;3. Applicability studyof heat pipe exchanger;4. Performance study of air conditioner and condenser in salt mist and corrosiveatmosphere;5. On the basis of the above studies, conclude the most suitable all-seasoncooling operational plan and carry out further analysis.Four key findings are resulted from the above studies. A selection betweenair-cooling and water-cooling systems can be justified. Analytical conclusion based onthe suitability of different radiating methodologies of heat pipe and recommendationof anti-corrosion materials applied in radiators and exposed spare parts can beobtained. Eventually, a combinatorial optimization of designing program forventilation and cooling system in the offshore booster station is proposed.