【摘要】 为了保证矩阵式变换器在电网电压非正常工况下安全稳定运行,提出一种基于间接空间矢量调制的前馈补偿控制策略。通过检测电网电压,计算出虚拟直流电压,并根据其变化实时地调节空间矢量调制系数。在样机上进行了实验验证。相比于无补偿的情况,采用前馈补偿策略后矩阵式变换器在电压不平衡时其输出电流的谐波含量减少超过45%,而在电压跌落时输出电流仍能维持正常运行时的幅值。结果表明:本方法有效地改善了矩阵式变换器在电网电压非正常工况下的输出性能,并减小了非正常工况对负载设备的不利影响。更多还原

【Abstract】 Safe and stable operation of matrix converters during abnormal grid voltage conditions can be ensured by a feed-forward compensation strategy based on indirect space vector modulation.A virtual dc link voltage of the matrix converter is calculated by measuring input grid voltages,with the space vector modulation index adjusted in real-time according to the variation of the virtual dc link voltage so that the output voltages and currents can be maintained at normal values.Tests were carried out on a matrix converter prototype.Compared with operation without compensation,the harmonic components of the output currents are reduced by more than 45% for unbalanced grid voltages and output currents are maintained steady during grid voltage sags.更多还原