多模块矩阵变换器改进型线电压合成闭环控制策略研究

针对常规三相-三相矩阵变换器电压传输率低的缺陷,文章研究了一种多模块矩阵变换器拓扑结构,详细介绍了线电压合成调制策略的实现过程,给出输入侧与输出侧扇区划分方式、占空比表达式,提出以输出调制系数作为控制对象的闭环控制策略。在闭环控制中因输入无阻尼LC滤波器引起输入电流谐振进而影响输入性能的问题,在上述线电压合成闭环控制策略基础上,改进了原有采用高通滤波器提取高频谐波量的谐振抑制方法,提出了通过简单的数学计算将输出负载电流dq轴分量中的高频谐波量反馈到闭环控制中,实现了多模块矩阵变换器输入谐振的有效抑制。最后,建立仿真模型,采用Matlab有效抑制输入谐振,同时具有良好的动态与静态性能。

Research on closed loop control strategy of improved line voltage synthesis for multi-modular matrix converter

Aiming at the defect of low voltage transmission rate of conventional three-phase-three-phase matrix converter, a multi-modular matrix converter topology is studied. In this paper, the realization process of dual-voltage synthesis modulation strategy is introduced in detail, and the division method and duty cycle expression of input side and output side are given. Then the closed-loop control strategy with output modulation coefficient as control object is proposed. In order to suppress the problem that the input current resonance caused by the input undamped LC filter affects the input performance in the closed-loop control, on the basis of the proposed closed-loop control strategy of line voltage synthesis, the original resonance suppression method using high pass filter to extract the high-frequency harmonic is improved, and the high-frequency harmonic in the dq axis component of the output load current is fed back to the output side through simple mathematical calculation. This control strategy can effectively suppress the input resonance of multi-modular matrix converter. Finally, the simulation model is established and verified by Matlab/Simulink. The results show that the improved closed-loop control strategy can effectively suppress the input resonance, and the system has good dynamic and static performance under the proposed strategy.