The invention discloses a high-power direct-current charging system, which is suitable for an electric ship. The system comprises two direct-current charging modules, each direct-current charging module comprises a self-adaptive detection control unit which is used for being connected with an electric ship and obtaining a voltage detection value; at least one voltage threshold range is preset in each self-adaptive detection control unit, and adjustment is carried out through the voltage detection value. A flexible grid-connected unit is further arranged and connected with the self-adaptive detection control units, and the working state of energy exchange between a direct-current bus and an external alternating-current power grid and the working state of the direct-current charging modules are adjusted according to the comparison result of the actual voltage of the direct-current bus and the voltage threshold range at the current moment. The system has the beneficial effects that the source-grid-load interaction capacity is improved through hybrid parallel connection of a phase-shifting rectification conversion device and a flexible grid-connected bidirectional device, and meanwhile, the system can still stably and reliably operate under the condition of local faults by adopting a multi-section direct-current bus connection mode in cooperation with the flexible grid-connected bidirectional device.
本发明公布了一种大功率直流充电系统,适用于电动船舶,包括:两个直流充电模块,其分别包括一自适应检测控制单元用于连接电动船舶并得到一电压检测值;自适应检测控制单元预设有至少一个电压阈值范围,并通过电压检测值进行调整;还设一柔性并网单元,连接自适应检测控制单元,并根据直流母线的实际电压和当前时刻的电压阈值范围的比较结果调整直流母线与外部交流电网进行能量交换的工作状态以及调整直流充电模块的工作状态。有益效果在于:通过移相整流变换装置和柔性并网双向装置混合并联提高了源—网—荷的互动能力,同时采用多段直流母线连接的方式搭配柔性并网双向装置来确保该系统在局部故障的情况下仍能稳定可靠运行。
High-power direct-current charging system
一种大功率直流充电系统
2021-04-20
Patent
Electronic Resource
Chinese