矩阵式中频电源预测控制策略研究

Research of Predictive Control Strategy for Matrix-converter-based Medium-frequency Power Supply

矩阵式中频电源具有输入输出同时可控的特点,针对传统控制算法只对输出电压进行控制的不足,设计了矩阵式中频电源预测控制策略。详细分析预测控制策略的原理和特性,采用了基于多步的预测控制方法。在此基础上建立了矩阵式中频电源的预测模型,设计了包含输入输出性能约束的评价函数。实验结果表明,所提出控制策略可抑制负载的扰动,实现中频电压的低谐波输出,同时可控制电源系统输入侧无功功率为零,有效地提高了系统的运行效率。优良的动静态性能表明,该方法可在大功率电源中得到进一步的推广和应用。

Matrix-converter-based medium-frequency power supply has the characteristics of simultaneously control-lable input and output. Considering that the traditional control methods only control the output voltage, a predictive con-trol strategy for a matrix-converter-based medium-frequency power supply was proposed in this paper. Through a detailed analysis of the principle and characteristic of the predictive control strategy, a multi-step predictive control method was adopted. On this basis, a predictive model of matrix-converter-based medium-frequency power supply was established, and an evaluation function including both the input and output constraints was designed. Experimental results show that the proposed control method can restrain load disturbances and achieve a medium-frequency output voltage with low- harmonic waves. Meanwhile, a zero-input reactive power can be realized, which effectively enhances the system’s opera-tion efficiency. The excellent dynamic and static performances indicate that this method can be further extended and ap-plied to high-power power supplies.