基于双变压器结构的多谐振高频链矩阵整流器的调制策略与建模分析

Control Strategy and Modeling Analysis of Multi-Resonant High-Frequency Link Matrix Rectifier Based on Double Transformers

文中将高频链矩阵整流器(HFLMR)与多谐振结合,提出了一种双变压器结构的新型变换器拓扑,提高了系统的功率密度和传输效率.在控制方式上提出了一种适用于HFLMR的调制方法—双极性电流空间矢量调制(B-C-SVM),能够为多谐振单元输入一个正负交变的高频电压,并且能使电流在网侧正弦化,功率因数单位化.为了明确高频输入信号与多谐振单元之间的相互配合关系,分析了变换器的工作波形,并根据高频输入信号将一个周期分成六个阶段,然后对每个阶段的运行模态进行详细分析.此外,采用等效基波法对多谐振单元进行了建模分析,给出谐振参数与谐振频率点之间的关系,并推导了电压增益,即输出电压和输入电压的比值关系,然后根据关系式做出了电压增益曲线.最后,仿真结果验证了本文所提系统的有效性与可行性.

In this paper,a novel converter topology with dual-transformer structure is proposed by combining high-frequency link Matrix Rectifier( HFLMR) with multi-resonant,which improves the power density and transmission efficiency of the system. In terms of control mode,a modulation method suitable for HFLMR-Bipolar Current Space Vector Modulation(B-C-SVM) is proposed,which can provide positive and negative alternating high-frequency input voltages for multi-resonant units,and can make the current sinusoidal at the grid side and unity of power factor. In order to clarify the relationship between the high frequency input signal and the multi-resonant unit,the operation waveform of the converter is analyzed. Then,according to the high frequency input signal,a cycle is divided into six stages,and the operation mode of each stage is analyzed in detail. In addition,the Fundamental Harmonic Approximation(FHA) is used to model and analyze the multi resonant unit. Then this paper gives the relationship between the resonant parameters and the resonant frequency.The voltage gain,the ratio of output voltage to input voltage,is derived,and the voltage gain curve is drawn according to the expression. Finally,the simulation results verify the effectiveness and feasibility of the proposed system.