多源动力矿卡三电平DC/DC变换器及其能量管理控制策略

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

多源动力矿用卡车节能环保、灵活高效,具有广阔的市场前景。三电平DC/DC变换器凭借其出色的输入输出特性常被用作矿卡车载能量交互设备,在车载多种动力设备和多种功能负载之间进行能量分配与管理。该变换器不仅需要满足多种供电模式以及电池充放电控制,并且需针对所带负载的多样性采用不同的控制方式以及自适应地在不同控制方式间进行切换,同时还需要解决不同模式下的中点电压平衡问题。文章以车载DC/DC变换器为研究对象,通过对能量流的分析,提出了一种采用电流方向判据的电池充放电、各种负载供电以及回馈的能量管理策略;同时设计三电平DC/DC变换器在不同工作状态下的统一化中点电压平衡控制策略,形成了一套完整的能量管理方式。仿真结果显示,采用该控制策略,DC/DC变换器在不同工况下都具有良好的中点电压平衡效果。

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.