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Energy-saving technologies for construction machinery:a review of electro-hydraulic pump-valve coordinated system

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2020年第5期21卷 331-349页

作者： Zhe-ming TONG Shuang-shuang WU Shui-guang TONG Yu-qing YUE Yuan-song LI Zheng-yu XU Yu-wei ZHONG State Key Laboratory of Fluid Power and Mechatronic systems Zhejiang UniversityHangzhou 310027China School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China Hangcha Group Co. Ltd.Hangzhou 311305China Guangxi Yuchai Machinery Group Co. Ltd.Yulin 537005China

With the rapid development of the global economy,more and more attention has been paid to the energy conservation of construction *** hydraulic system is the key component of construction machinery,and improving its energy utilization rate has become an important means to achieve energy *** conventional valve-controlled or pump-controlled hydraulic systems of construction machinery,controllability and energy-saving performance typically cannot be considered at the same *** pump-valve coordinated system combines the energy-saving characteristics of the pump-controlled system and the high-precision and high-frequency response of the valve-controlled system,which has the potential to become a primary research direction of electro-hydraulic *** review summarizes the recent research progress in energy-saving technologies based on pump-valve coordinated ***,we discuss the structures of hydraulic systems in different categories of construction machinery,various control methods of the electro-hydraulic system,novel hydraulic hybrid energy regeneration systems,and key *** addition,future directions and challenges of the pump-valve coordinated systems are described,such as independent metering system(IMS),common pressure rail(CPR),and hybrid power source(HPS).

关键词： Construction machinery Energy saving Pump-valve coordinated systems Control algorithm hydraulic systems

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Stability Study on Hydroelectric Production Site Using Eigenvalues Analysis Method

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Journal of Energy and Power Engineering 2012年第6期6卷 940-948页

作者： Pedro Camilo de Oliveira e Silva Basile Kawkabani Sébastien Alligné Christophe Nicolet Jean-Jacques Simond Francois Avellan Electrical Machinery Laboratory Ecole Polytechnique Fédérale de Lausanne EPFL Lausanne CH-1015 Switzerland Laboratory for hydraulic Machines Ecole Polytechnique Fédérale de Lausanne EPFL Lausanne CH-1015 Switzerland Power Vision Engineering Sàrl Eeublens CH-1024 Switzerland

The eigenvalues analysis method is generally applied to synchronous machines by using d, q-components. This paper presents the application of this method on an equivalent model for the synchronous machine based on phase variables a, b, c instead of d, q-components. The advantages of this approach, essential for programs using phase variables as state variables, are presented. The application of this method to a complete hydroelectric production site including hydraulic components （pump-turbine, penstock, gallery, reservoir...） permits the study and analysis of the interactions between the hydraulic, electric and regulation parts of the system. Results coming from the proposed eigenvalues analysis method and the numerical simulations confirm the interest of the presented approach.

关键词： hydraulic systems eigenvalues and eigenfunctions power systems transient analysis.

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