Based On Hybrid Hydraulic Excavator Of The Super Capacitor Energy Storage System Research

Based on the application conditions of parallel hybrid excavator and the analysis of charging and discharging conditions of the hybrid power system, an energy storage system combined of a newly developed electrical storage unit, ultracapacitor, was introduced. For the main issues with this storage system to be discussed and solved, this paper made a great effort in analysis and solution optimization, and proposed a systematical management scheme.The major progress is as follows:1. After analysis and comparison of different hybrid excavator, energy storage system and storage unit, an energy storage system composed of ultracapacitors were developed, main issues and considerations within this program were expatiated systematically.2. Through investigation of plentiful experimental data, the essential characteristic of hybrid power system were analyzed and explained. Simulations were conducted to estimate the energy and power demand of electrical storage system, and a selection method of storage system based on ultracapacitor was formed.3. Based on the introduction of ultracapacitor's physical configuration and comparison of various kinds of existed theoretical models, a special theoretical model well adapted for applying in hybrid excavator power system was proposed. A bunch of testing was conducted at the selected Maxwell ultracapacitor module, critical parameters were explored and dynamic characteristics were analyzed.4. For the purpose of improving the utilization ratio of this energy storage system, the issues of voltage balancing and stabilizing were investigated and various solutions were presented and compared. This chapter proposed a creative parallel-series changeover configuration and simulation was performed.5. The information management and monitoring system of the ultracapacitor storage system was designed in this chapter. The main contents comprise the real time estimation of SOC and SOH, data acquisition and transmission, HMI design, failure alarm and protection and thermal management.