基于排量和压力控制的液压式海流发电变速恒频及试验研究

发布时间：2018-03-25 01:21

本文选题：海流发电系统　切入点：液压传动　出处：《浙江大学》2014年博士论文

【摘要】：社会经济的快速发展提高了对能源的需求,受传统化石能源的过度消耗和环境污染等的影响,风能、太阳能、海洋能等可再生能源发电技术越来越受到国内外学者的重视。本文研究的海流能发电技术是一种利用海水流体动能来发电的可再生能源利用技术。海流能资源蕴藏量大,且具有能量密度大、规律性强等优点,海流能的研究及其大规模开发将对能源结构的多样化、降低对传统能源的依赖等具有重要意义。海流能发电技术始于上世纪七十年代,并在近年来得到了快速发展,目前国际上单机功率已超过1MW。尽管如此,海流能发电机组仍有一些关键技术需要突破,如叶片设计技术、能量传递系统的稳定性及其可靠性、变速恒频控制技术等。本文在综合国内外海流能发电机组齿轮箱传动、液压传动等技术的基础上,并结合海流能发电机组应便于维护的要求,提出基于电液比例容积调速控制的水下定量泵、水上变量泵-变量马达海流发电系统能量传递方案,并对其变速恒频控制技术进行了研究。论文在理论分析、数学建模、仿真模拟的基础上,完成了样机系统的场内模拟试验。论文的各章节内容如下：第一章,结合课题的研究意义及背景,在综合分析国内外海流能发电能量传动技术及其发展现状的基础上,提出了论文的主要研究内容。第二章,介绍了水平轴海流发电系统的能量转换及功率特性。运用叶素理论对运动水流中的叶片的受力情况及叶轮捕能原理进行分析,并得到了叶轮功率特性和转矩特性。在此基础上,对海流发电系统液压式传动系统能量传递原理进行了介绍。第三章,基于液压系统压力调节技术,设计了“双泵-单马达”拓扑结构的海流发电液压传动系统,对比分析了“双泵-单马达-蓄能稳压”结构和“双泵.单马达-无蓄能器”两种结构,对上述结构进行数学模型分析并制定了相应的控制策略。结合实际应用便于维护的要求,针对“双泵-单马达-无蓄能器”结构制定了分工况控制策略,即高负载工况“变速”-低负载工况“恒频”控制策略。第四章,对论文提出的海流发电液压传动系统分别进行建模,运用联合仿真方法对系统结构原理及对应的“变速恒频”控制策略进行仿真研究。结果表明,所设计海流发电液压传动系统可实现叶轮“变速”控制和发电机“恒频”控制,从而验证了所设计海流发电液压式能量传递方案及其变速恒频控制策略的正确性。第五章,针对“双泵-单马达-蓄能稳压”结构和“双泵-单马达-无蓄能器”结构两种传动形式,设计制造了4kW海流发电液压传动系统试验平台。该平台通过转矩闭环控制可实现叶轮转矩的精确模拟。以阶跃/恒流速信号和正弦流速信号作为试验系统输入,分别测试了试验系统的动态响应特性。试验结果表明该传动系统能够较好地实现海流发电的“变速”和“恒频”控制。第六章,针对海流发电系统液压传动效率相对较低的特点,设计了机械-液压混合传动的海流发电系统方案,并针对该方案制定了相应的“变速恒频”控制策略。建立了该系统的数学仿真模型,联合仿真结果表明,机械-液压混合传动的海流发电系统不仅具有机械传动效率高的优点,而且可以在液压传动环节完成叶轮的“变速”控制。第七章,对本论文所作的研究工作进行了总结,并概括了本论文的创新点。作为本论文研究工作的延续,对后续的研究工作做了一些展望。
[Abstract]:The rapid development of social economy has increased the demand for energy, impact by the traditional fossil energy depletion and environmental pollution, wind energy, solar energy, ocean energy and other renewable energy power generation technology has attracted more and more attention of scholars at home and abroad. This paper studies the current power generation technology is a kind of renewable power generation using seawater fluid kinetic energy energy utilization technology. Current energy resource reserves, and has the advantages of high energy density, strong regularity, and its current research to the large-scale development of the energy structure diversification, is important to reduce dependence on traditional energy sources. The current power generation technology began in the last century in 70s, and has been developing rapidly in recent years at present, the international power has more than 1MW. in spite of this, current power generating unit there are still some key technology, such as blade design technology, energy transfer The stability and reliability of delivery system, variable speed control technology at home and abroad. In this paper, the current energy generator gearbox and basic hydraulic transmission technology, combined with the current power unit should facilitate the maintenance requirements, put forward the electro-hydraulic proportional speed control volume under water pump based on quantitative, water energy variables pump variable motor current generator system transfer scheme, and the variable speed constant frequency control technology is studied. Based on theoretical analysis, mathematical modeling and simulation based on the prototype system of the field simulation test. The chapters of the thesis are as follows: the first chapter, combining the research significance and background of the subject, in the based on the comprehensive analysis of domestic and foreign current power energy transmission technology and its development status, put forward the main contents of this thesis. The second chapter introduces the horizontal axis current power system Energy conversion and power characteristics. Using blade element theory and the stress of impeller blade motion flow in the trapping energy principle analysis, and get the impeller power and torque characteristics. On this basis, the energy transmission system of hydraulic power system ocean transfer principle are introduced. The third chapter, control technology of hydraulic system based on the pressure, the design of "ocean power hydraulic transmission system of double pump single motor topology, comparative analysis of the" double pump single motor - pumped storage power structure "and" double pump. Single motor - no accumulator "two kinds of structure, a mathematical model for analysis of the structure and the development of the the corresponding control strategy. According to the actual application requirements for easy maintenance, double pump and single motor - no" structure have condition control strategy of energy storage, high load "transmission" low load "frequency" control strategy Slightly. In the fourth chapter, the current generation of hydraulic transmission system proposed in this paper are modeling, using the co simulation method of system structure principle and the corresponding VSCF control strategy is simulated. The results show that the design of ocean power hydraulic transmission system can achieve the "speed control" impeller and generator "frequency" control, thus verify the design of ocean power hydraulic energy transfer scheme is correct and the variable speed constant frequency control strategy. In the fifth chapter, according to the "double pump single motor - pumped storage power structure" and "double pump - motor - no single accumulator" structure of two kinds of transmission form, 4kW test platform of hydraulic transmission system of the current generation the design and manufacture. The platform can realize accurate control simulation of the impeller torque through the torque loop. In step / constant flow rate signal and sine signal as the input velocity test system, test test The dynamic response characteristics of the test system. The test results show that the transmission system can realize current power generation "speed" and "speed control". In the sixth chapter, according to the characteristics of the hydraulic transmission efficiency of ocean current power generation system is relatively low, the design scheme of ocean current power generation system mechanical hydraulic hybrid transmission, and according to the plan the corresponding VSCF control strategy. A mathematical simulation model of the system, and the simulation results show that the current generation system of mechanical - hydraulic hybrid transmission not only has the advantages of high mechanical transmission efficiency, but also in the hydraulic transmission link of impeller velocity control. In the seventh chapter, the research work of this paper summarizes, and summarizes the innovation of this paper. As a continuation of the research work in this dissertation, the following research work is prospected.

【学位授予单位】：浙江大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM612;P743.1

【引证文献】