抑制输入电流低频谐波的3-1MC闭环控制策略

Research on the 3-1MC closed-loop control strategy suppressing the low-frequency harmonics of input current

针对常规三相-单向矩阵变换器(3-1MC)中间环节无大容量储能单元,输出单相脉动功率耦合到输入侧,使输入电流中引入低频谐波的问题,本文基于输出侧脉动功率补偿的拓扑结构,建立了时域数学模型,分析了该拓扑结构对调制函数、电压传输率等系统参数的影响。提出了一种级联式双闭环控制策略,通过建立控制系统传递函数,给出了3-1MC双闭环控制中参数的整定方法。本文对所提策略在功率补偿拓扑下进行了仿真分析,结果表明所提控制策略不仅能实现输入与输出功率的解耦,同时具有良好的静态与动态性能,且该策略的参数整定简单,适合工程实际应用。

A conventional3-phase-1-phase matrix converter(3-1MC)has no large capacity storage unit in the intermediate links,and the output single-phase pulsating power is coupled to the input side.Therefore,the low-frequency harmonic is introduced into the input current.To eliminate this defect,a time-domain mathematical model was established based on the topology structure of pulse power compensation on the output side,and the influences of the topology structure on modulation function,voltage transmission rate,and other system parameters were analyzed.In addition,a cascade double-closed-loop control strategy was proposed.By establishing the transfer function of the control system,the setting method of the parameters in the3-1MC double-closed-loop control was then provided.Finally,the simulation analysis of the proposed strategy was performed under the power compensation topology.The results show that the proposed control strategy achieves the decoupling of input and output power and exhibits good static and dynamic performance.The parameter tuning of this strategy is simple and suitable for practical engineering applications.