Design of a novel traction converter for electric locomotive
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摘要: 针对传统交直交电力机车牵引系统存在主电路结构复杂、功率和电压水平受限等问题，基于采用全桥型子模块的模块化多电平换流器结构，设计了一种单相AC-三相AC电力机车牵引换流器，可直接驱动三相异步牵引电动机，从而取消了车载降压变压器，降低了电力机车牵引系统的复杂度。通过建立该换流器在两相同步旋转dq坐标系的数学模型，提出了一种外环定交流电压控制策略和内环直接电流控制策略。仿真结果验证了该换流器及控制策略的有效性。Abstract: In view of problems of complex structure of main circuit and limited power and voltage existed in traditional traction system of AC-DC-AC electric locomotive, a traction converter for electric locomotive with single-phase AC input and three-phase AC output was designed based on structure of modular multilevel converter using full bridge sub-module. The traction converter can drive traction motor directly, so as to eliminate vehicle-mounted step-down transformer and reduce complexity of traction system of electric locomotive. A constant AC voltage control strategy in outer loop and direct current control strategy in inner loop was proposed according to mathematic model of the converter established in two-phase synchronous rotating dq coordinate system. The simulation results verify validity of the converter and the control strategies.
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