Theoretical basis for combining thermo-hydraulic and thermo-electric power conversion into one unit - thermo-hydraulic linear generator

将热工水力和热电动力转换合二为一的理论基础——热工水力线性发电机

• 批准号: 273596486
• 负责人: Professor Dr.-Ing. Wilfried Hofmann
• 金额: --
• 依托单位: Stiftungsprofessur für Baumaschinen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/273596486?language=en
• 关键词: Theoretical; basis; combining; thermo; hydraulic

Hitherto, hydraulics is the preferred type of power conversion and transmission in mobile machinery. For years, at the applicants, they have successfully been dealing with the development of a simple and inexpensive drive unit of the thermo-hydraulic free piston engine (FKM) for mobile hydraulic hybrid technology, which is capable of providing the required hydraulic propulsion power to the machine as efficiently and with as low-emissions as possible. Current developments in electric engineering enable the development of new applications. The reasons for replacing conventional drives are the increased energy efficiency and / or the improved controllability. Therefore, out of functional and energetic reasons, the simultaneous supply of hydraulic and electric power in a primary unit for future mobile machines is desirable. The aim of the research project is to provide the theoretical basis for combining thermo-hydraulic and thermo-electric power conversion into one unit (thermo-hydraulic linear generator - THLG) in order to obtain a reliable estimate of the technical realisation and the technical complexity. The simultaneous and in its ratio freely selectable supply of hydraulic and electric power on the basis of the free piston principle is possible in principal. However this requires fundamental research concerning the interaction between both energy transformations, of a stable process control as well as the analysis and assessment of the physical process parameters concerning the future design of a prototype. Starting from a suitable system configuration of the FKM under specific requirements, a linear generator which is optimized in power density and adapted to the existing prototypes is developed. The combination of both power conversions requires a coordinated control strategy, which can be derived from the dependencies of the subsystems with each other and the dynamic behavior of the whole system. These must allow a power output which meets the requirements and is simultaneous and variable on the hydraulic and the electric side as well as ensure a stable operation. For this purpose different regulatory approaches for the inner-stationary operation of the subsystem linear generator, which is conditional to principles, and the highly dynamic behavior of the complete system THLG are to be investigated. In order to keep hardware costs low, sensorless position detection is preferred, since the control of the linear machine requires an exact knowledge of the position of the mover. The possible adaptation of hybrid sensorless methods over the whole speed range is analysed for the specific application THLG. The result is detailed information on a THLG, whether and under which technical efforts it is practicable. They include both, issues of energetics and control.

迄今为止，液压系统是移动机械中首选的动力转换和传输类型。多年来，申请人一直在成功开发一种简单且廉价的用于移动液压混合技术的热液压自由活塞发动机（FKM）驱动装置，该装置能够为车辆提供所需的液压推进动力。机器尽可能高效且排放量尽可能低。当前电气工程的发展使得新应用的开发成为可能。取代传统驱动器的原因是提高能源效率和/或改善可控性。因此，出于功能和能量方面的原因，希望在未来移动机器的主单元中同时提供液压和电力。该研究项目的目的是为将热工水力和热电功率转换结合到一个单元（热工水力线性发电机 - THLG）中提供理论基础，以便获得对技术实现和技术复杂性的可靠估计。原则上，基于自由活塞原理同时且可自由选择比例地供应液压和电力是可能的。然而，这需要对两种能量转换之间的相互作用、稳定的过程控制以及涉及未来原型设计的物理过程参数的分析和评估进行基础研究。从特定要求下合适的 FKM 系统配置出发，开发了功率密度优化并适应现有原型的线性发电机。两种功率转换的组合需要协调的控制策略，该策略可以从子系统彼此之间的依赖性以及整个系统的动态行为中得出。这些必须允许满足要求的功率输出，并且在液压和电动侧是同步且可变的，并确保稳定运行。为此，需要研究子系统线性发电机内部稳态运行的不同调节方法（以原理为条件）以及整个系统 THLG 的高动态行为。为了保持较低的硬件成本，优选无传感器位置检测，因为线性机器的控制需要准确了解动子的位置。针对特定应用 THLG 分析了混合无传感器方法在整个速度范围内的可能适应性。结果是有关 THLG 的详细信息，以及它是否可行以及在何种技术努力下可行。它们包括能量学和控制问题。