Multi-source Powered Mining Truck Three-level DC/DC Converter and Its Energy Management Control Strategy

Abstract

Multi-source powered mining trucks are expected with broad market prospects, due to the advantages in energy conservation, environmental protection, flexibility and efficiency. The three-level DC/DC converter with excellent input and output characteristics is generally used as an on-board energy interaction device for energy distribution and management between various on-board power equipment and multiple functional loads. In addition to adaption to a variety of power supply modes and battery charging and discharging control, the converter needs to be configured with different control methods and adaptively switchable among different control methods for the diversity of loads; moreover, it is necessary to solve the neutral point voltage balancing under different modes. Taking the on-board DC/DC converter as the research object, this paper first analyzes energy flow, and proposes an energy management strategy for battery charging and discharging, power supply for various loads and feedback depending on current direction, and a unified neutral point voltage balancing strategy for the three-level DC/DC converter under different working conditions, forming a complete set of energy management methodology. The simulation results show that the DC/DC converter applied with this control strategy has a good neutral point voltage balancing effect under different working conditions.

Keywords

• energy management
• three-level dc/dc converter
• control of charging and discharging
• neutral point voltage balancing
• mine truck