矩阵变换器占空比矢量调制策略的优化研究

The Optimization of Matrix Converter Based on Duty-cycle Vector Modulation Strategy

矩阵变换器调制策略是实现其功能并保证系统稳定可靠运行的一个重要环节,适当的调制策略可以提高其电压传输比,减少换流次数,节省功耗,改善输出波形质量。占空比矢量调制策略是一种具有普遍意义的调制策略,通过选取特定的自由参数和自由矢量实现不同的调制策略。采用矢量分析方法对占空比矢量调制策略中的自由参数和自由矢量进行深入研究,得到它与其他调制策略的具体内在联系,并提出了一种基于该调制策略的优化方案。该方案构造了自由矢量新的表达式,使矩阵变换器能减少换流次数及波形失真,从而改善波形质量,同时仍能得到最大电压传输比值0.866。通过实验验证优化方案的正确性和可行性。

Matrix converter modulation strategy is a vital link which can realize its function and guarantee the system stable operation.Appropriate modulation strategy can improve the voltage transfer ratio ,reduce the number of times of commutation,save power,improve the quality of the output waveform and so on.The duty-cycle vector modulation strategy is a kind of modulation strategy with universal meaning which can be realize different modulation strategies. The article makes an deep research on free parameter and vector of the modulation strategy using vector analysis method, gets the inherent connection between different strategies and proposes an optimization scheme based on it.The scheme construct the new expression of free vector which greatly reduces the number of times of commutation, and reduces the waveform distortion while still gets the maximum voltage transfer radio, namely 0.866.The correctness and feasibility of the optimization method are verified by experiments.