双电压合成矩阵变换器闭环控制的研究

RESEARCH ON CLOSED-LOOP CONTROL METHOD FOR MATRIX CONVERTER BASED ON DOUBLE LINE-TO-LINE VOLTAGE SYNTHESIS

该文提出了一种基于双电压合成矩阵变换器的闭环控制方法。该方法根据矩阵变换器的实际输出电压与期望输出电压的偏差 ,计算电压的实际占空比与理想占空比的偏差 ,并将此偏差作为负反馈加到下一采样周期的占空比中 ,从而实现系统的闭环控制。文中详细阐述了闭环控制系统的基本原理及实现策略。利用该文提出的闭环控制方法 ,可保证矩阵变换器的输出电压很好地跟随给定的期望电压 ,并可有效地抑制矩阵变换器输出电压及输入电流波形的畸变。仿真结果表明 :采用闭环控制 ,对于抑制因输入电压畸变或器件性能不理想等因素而导致的矩阵变换器输出电压及输入电流波形的畸变 ,具有明显效果。

A closed loop control method for the matrix converter based on double line to line voltage synthesis algorithm is proposed in this paper.The errors between the actual duty ratios and the realism duty ratios of the voltages are calculated through the errors between the actual output voltages and expected output voltages of the matrix converter. The obtained duty ratio errors are utilized as the feedback to the duty ratios of the next sampling period to realize the closed loop control method for the matrix converter.The basic operating principle and realizing method are given in the paper. The proposed closed loop control method can make the output voltage follow the reference voltage very well, and it can suppress the waveform distortion of the output voltages and input currents.Simulation results prove that the proposed closed loop control method is valid to suppress the waveform distortion of the matrix converter output voltages and input currents caused by the distortion of source voltages or the performance difference between the real power switches and ideal power switches.