Nonlinearity Analysis and Compensation Strategies for Two-stage Matrix Converter
Nonlinearity Analysis and Compensation Strategies for Two-stage Matrix Converter
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发表时间：
2010
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通讯作者：
Gui Wei-hua
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作者：
Gui Wei-hua
分析了两级矩阵变换器（TSMC）输出电压的非线性来源和特点。由于两级式传统矩阵变换器和有源前端变换器在结构和功能上的相似性，对其进行了比较。结果表明，TSMC的非线性特性具有窄脉冲、器件压降和滤波电容纹波等特点，这与TSMC的调制策略、工作机制和拓扑结构有关。为了满足系统可靠运行的要求，补偿非线性的负面影响，提出了改进的调制策略和非线性补偿算法。改进的调制策略的关键是引入一个时变分布因子，克服了真实的实际中的约束，无需特殊处理即可满足最小窄脉冲约束。结果表明，TSMC的输出和输入波形质量都得到了很大的改善，特别是在调制指数接近极限的区域。实验结果验证了该方法的可行性。
The nonlinearity sources and features of two-stage matrix converter (TSMC) output voltage were analyzed. Due to the similarity of two-stage, traditional matrix converter and active-front-end converter in terms of structure and function, comparisons were carried out. It was found that the nonlinearity of TSMC had many special features, such as narrow pulse, device voltage drops and ripples of filter capacitor which was concerned with modulation strategy, operating mechanism and topologies. To meet the end of reliable operation and compensate the negative affects of nonlinearity, revised modulation strategy and nonlinearity compensation algorithms were proposed. The key to the improved modulation strategy was one time varying distribution factor which was introduced to overcome the constraints from real practice, and the minimum narrow pulse restriction could be met without special handling. As a result, the waveform quality of TSMC both in output and input was improved greatly, especially in the region where the modulation index is close to limitation. The experimental results verify the feasibility of the proposed method.