基于SVPWM的动车组辅助逆变器波形控制技术研究

Study on EMU Auxiliary Inverter Waveform Control Technology Based on SVPWM

随着动车组车载设备的多样化,辅助逆变器的负载条件越来越复杂,负载设备的频繁投切、非线性负载容量的增大都对辅助逆变器的输出波形控制技术提出了新的要求。介绍了空间矢量调制(SVPWM)的基本算法,并对基于SVPWM调制技术的辅助逆变器进行了系统建模,并重点对非线性负载引起的输出电压畸变现象进行了分析。针对动车组负载情况和SVPWM调制技术特点,提出了电压闭环和输出电流前馈相结合的控制技术,不仅可以实现输出电压的无静差控制,并且提高了对负载投切情况的动态调节性能。最后通过MATLAB仿真验证了提出方案的可行性并在试验平台上进行了不同负载条件下的测试,证明了基于SVPWM的波形控制技术的实用性。

As EMU’s on-board equipments become more diversified,the loading conditions of auxiliary inverter also become more complex.The frequent switch of the loading equipment and the increase of the nonlinear load capacity have put forward new requirements for the auxiliary inverter’s output waveform control technology.This paper introduces the basic algorithm of space vector modulation（SVPWM）,conducts the system modeling for the auxiliary inverter based on SVPWM and emphatically analyzes the distortion phenomenon of output voltage caused by nonlinear load.On the basis of the loading conditions of EMU and the characteristics of SVPWM modulation technology,this paper puts forward the control technology that combines voltage closed loop and output current feed forward,which can not only realize the floating control of output voltage but also improve the dynamic regulation performance to load switch conditions.Finally,the simulation of MATLAB verifies the feasibility of the proposed scheme.Tests under different loading conditions are conducted on the test platform,which can prove the practicability of the waveform control technology based on SVPWM.