集中式多电平调制策略的状态机型脉冲分配器设计与实现

发布时间：2019-07-07 21:37

【摘要】：脉冲分配方式是实现如载波层叠调制、最近电平逼近调制等集中式多电平调制策略的主要难点。针对含冗余状态的模块组合型多电平变换器,提出一种应用于集中式调制策略的状态机型脉冲分配器设计与实现方法。该脉冲分配器致力于使电平化后的调制信号遍历状态机中的所有路径,从而各个模块的开关次数在各个电平等级都得到均匀的分配,实现了模块电容电压的自然平衡特性。同时,针对低频类调制策略无法自动遍历状态机的情形,该状态机具有状态强制切换功能,在最大限度维持模块开关频率低频特性的条件下,使其能够在合理的时间范围内遍历状态机。通过基于模块化多电平变换器平台的仿真与实验验证了状态机型脉冲分配器的有效性。
文内图片：

图片说明：NLM调制策略的输出特性
[Abstract]:Pulse allocation is the main difficulty in realizing centralized multilevel modulation strategies such as carrier cascade modulation and nearest level approach modulation. Aiming at the modular combined multilevel converter with redundant state, a design and implementation method of state pulse distributor applied to centralized modulation strategy is proposed. The pulse distributor is dedicated to making the flattened modulation signal traverse all the paths in the state machine, so that the switching times of each module are evenly distributed at each level, and the natural balance characteristics of the capacitance voltage of the module are realized. At the same time, in the case that the low frequency modulation strategy can not automatically traverse the state machine, the state machine has the function of state forced switching, which enables the state machine to traverse the state machine in a reasonable time range under the condition of maintaining the low frequency characteristics of the switching frequency of the module to the maximum extent. The effectiveness of the state pulse distributor is verified by simulation and experiment based on modular multilevel converter platform.
【作者单位】：东南大学电气工程学院;南京理工大学自动化学院;
【基金】：国家自然科学基金项目(51477030)~~
【分类号】：TM46

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