基于Simulink5.0的交-交变频器仿真分析

Analysis and Simulation of AC-AC Converter Based on Simulink5.0

交-交变频器的控制实现比较困难,并且由它产生的谐波模式十分复杂,所以当前利用计算机仿真进行分析和研究是最为简便的方法。以余弦交截法为原理,通过MATLAB软件中的电力系统模块库对交-交变频器进行了仿真。在无环流换相逻辑部分,为了简化仿真过程,还使用了MATLAB软件中的子系统。使用实时比较的新方法,不仅可以获得触发脉冲,还可以通过改变模型中的参数来获得任意频率和幅值下的低频波。依据对交-交变频器输出波形结果的分析,验证了所建立模型的正确性。同时还对负载侧电流进行了傅立叶变换,得出了部分谐波的幅值和相位,为有源电力滤波器的设计提供了依据和参数。

It is rather difficult to accomplish the control of the AC-AC converter, and the harmonic mode it induces is very complicated. Therefore, computer simulation technology is the most convenient method to analyze and research at present. Based on the cosine wave crossing, the simulation is carried out by the power system blocks of the MATLAB software in this paper. In order to simplify the simulation process, it makes use of the subsystem in the MATLAB software on the part of the logical non-circulating switch phase. With the new method of real-time comparison, we not only attain pulses, but also obtain low-frequency wave of any frequency and amplitude by changing the modal parameter. The model is validated by AC-AC converter＇ s wave from the result of the simulation. Meanwhile the current of the load is analyzed with Fourier Method, and the amplitude and phase of some harmonics are obtained, providing the basis and parameter for the design of the active power filter.