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根据液压发电系统特性可知,其工作转速由蓄能器压力和发电机负载决定,而蓄能器压力和发电机负载是实时变量,不加控制将无法实现液压发电系统始终工作在最佳转速曲线。特别是当液压发电系统整流后直接馈入海岛直流微电网时,转速由直流电网电压唯一确定。文中通过引入Boost变换电路,实现液压发电系统转速的实时控制。提出最高效率转换控制策略,实现液压发电系统始终工作在最佳转速曲线。推导了液压发电系统Boost变换机理,通过试验得到了最佳转速曲线,建立了液压发电系统经过交错并联Boost变换器馈入直流微电网的仿真模型。仿真结果表明,在Boost变换器控制下,液压发电系统始终工作在给定的最佳转速曲线,实现了液压发电系统最高效率转换控制策略。
According to the characteristics of hydraulic power generation system, the working speed is determined by accumulator pressure and generator load, while accumulator pressure and generator load are real-time variables. Uncontrolled hydraulic power system will not work at optimal speed curve . Especially when the hydraulic power system rectifier directly fed into the island DC microgrid, the speed determined by the DC grid voltage. In this paper, the Boost converter circuit is introduced to realize the real-time control of the speed of hydraulic power generation system. Proposed the most efficient conversion control strategy to achieve the hydraulic power generation system is always working at the best speed curve. The Boost transformation mechanism of hydraulic power generation system is deduced, and the optimal speed curve is obtained through experiments. The simulation model of the hydropower system fed to the DC microgrid by interleaved parallel Boost converter is established. The simulation results show that under the control of Boost converter, the hydraulic power generation system always works at a given optimal speed curve, and the highest efficiency conversion control strategy of the hydraulic power generation system is achieved.