三相四线制地铁辅助逆变器控制策略研究

摘要

To solve the problem of unbalanced loading of auxiliary converters in urban rail transit, the output voltage equations of the three-phase four-wire inverter were derived from the inverter model and on this basis the new, simple and effective open-loop control strategy was set up with the symmetrical component method. The method to implement the control strategy was investigated deeply by applying three-dimensional space vector modulation. Theoretical analysis indicates that the control strategy and the modulation method may combine to solve the problem of unbalancing of output voltages. This was verified by simulation.%为解决城市轨道交通辅助变流器负载不平衡问题,首先通过数学建模推导出三相四线制逆变器输出电压方程,进而以此为依据根据对称分量法得到一种简单有效的开环控制策略.为实现这种控制策略,应用三维空间矢量调制法,对其实现方法进行详细深入地探讨.通过理论分析这种控制策略,结合三维空间矢量调制法能够解决输出电压不平衡问题.用仿真对其进行验证,进一步论证了其正确性.