基于拓扑解耦的矩阵式高频链逆变器控制新方法

Control of high-frequency link matrix inverter based on topology decoupling

针对矩阵式高频链逆变器复杂的拓扑结构,提出了一种基于拓扑解耦思想的新型控制策略。根据高频逆变桥生成高频电压波形的极性,将单相交流变换到三相交流的矩阵变换器拓扑解耦成2个常规的三相电压源逆变器,从而可将常规电压源逆变器的控制策略引入到对矩阵变换器的控制中。与应用矩阵变换器的交/直/交等效模型和优化控制算法相比,拓扑解耦控制策略从矩阵变换器拓扑本身入手,原理实现简单,并能极大简化对矩阵变换器的分析过程。为便于系统理论分析,提出了"双向桥臂"概念。应用Saber仿真软件进行了仿真研究,并搭建实验样机进行了实验验证,结果表明该控制方法能获得良好的输出电压波形,验证了所提控制策略的正确性。

A control strategy based on topology decoupling is proposed for the complicated topology frame of high-frequency link matrix inverter.According to the polarity of voltage produced by high-frequency inverter,the topology of single-phase to three-phase AC matrix converter is decoupled into two conventional three-phase voltage source inverters.The control strategies of conventional voltage source inverters are thus applied to the control of matrix converter.Compared with the AC/DC/AC equivalent model with matrix converter and the optimized control algorithm,the topology decoupling control strategy is based on the matrix converter topology itself,easy to realize and simple to analyze.To facilitate the theoretical analysis,the concept of ＂bi-directional bridge arm＂ is presented.The simulation with Saber software and the experiments on prototype show that the proposed control strategy generates high-quality output voltage waveforms,which verifies its correctness.