三相四线制地铁辅助逆变器控制策略研究

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。

Research on Control Strategy of Three-phase Four-wire Metro Auxiliary Converter

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.