双级矩阵变换器网侧功率因数的控制方法

Control Method Analysis of Grid Side Power Factor in Two Stage Matrix Converter

与传统PWM变频器相比,双级矩阵式变换器具有输入功率因数可控、能量双向流动、无需大容量直流环节储能电容等优点。为了减小双级矩阵变换器对电网的不利影响,在对其进行控制的过程中,通常需要保证网侧功率因数为1。本文以双级矩阵变换器为研究对象,首先对其拓扑结构以及整流级和逆变级的控制策略进行了分析。在此基础上,研究了变换器前端功率因数角的调节范围。而后,考虑到输入滤波器的影响,推导得出了实际的网侧功率因数角和滤波器之后的功率因数角之间的关系。根据上述关系建立了实用的网侧功率因数调节方法,实现了单位功率因数。仿真和实验结果验证了理论分析的正确性。

Two stage matrix converter（TSMC） has attractive advantages over conventional PWM converters for the controllable input power factor,bi-directional power flow and the absence of large dc-link energy storage capacitors.In order to reduce the influence to the grid,in the process of controlling TSMC,the unity input power factor is usually reached.TSMC is selected as a research object.Its topology and control methods in the rectifier and inverter stage are analyzed.Based on the methods,the regulation range of input power factor before the converter is researched.Then,the input LC filter in the grid side is taken into account.The relationship between the actual power factor angle in the grid side and the angle after the input filter is reached.So,with the above relationship,the practical regulation method of the grid side power factor angle is set up.And the unity power factor in the grid side is reached.The rationality of the theoretical analysis can be verified by simulation and experiment results.