动臂势能再生混合储能系统的设计与分析研究

液压蓄能器储能一直是液压系统唯一的储能方法,被广泛应用于混合动力液压挖掘机中,具有功率密度高、响应快、工作稳定、性价比高等优点。但是与电储能方式相比,液压蓄能器的能量密度低、吸放能压力波动大,限制其在混合动力液压挖掘机上的应用。提出了一种混合储能系统(HES),一部分能量按传统液压蓄能器储能方式,以保证功率密度;其他能量转换为电储能方式,以保证能量密度。基于一台1.7 t的微型液压挖掘机,建立了该混合储能系统的全尺寸仿真模型,实现了液压挖掘机动臂能量再生。研究结果表明,该混合储能系统能够有效回收动臂势能,且能量密度较高,吸放能压力波动小。

Design and Energy Analysis of Hybrid Energy Storage for Boom Potential Energy Regeneration

Hydraulic accumulator is the only energy storage method in hydraulic system, which is widely used in hybrid construction machinery (HCM). Hydraulic accumulator has the advantages of high power density, fast response, stable work and high cost performance. However, compared with the electricity storage, the low energy density and large pressure fluctuation during energy absorption and discharge limit the application in the HCM. To solve above problems, this paper designed a hybrid energy storage (HES). Part of the energy is stored in the traditional hydraulic accumulator to ensure the power density, while the rest of the energy is converted into electricity to ensure the energy density. Based on a 1.7-ton hydraulic mini-excavator, a full-size simulation model of the HES is established to achieve boom potential energy regeneration. The research results show that the HES can effectively regenerate the boom potential energy with a high energy density and a small pressure fluctuation.