适用于含大量子模块的MMC快速电容电压均衡策略

发布时间：2019-04-23 09:55

【摘要】：对于含大量子模块的模块化多电平换流器(modular multilevel converter,MMC)而言,基于实时排序的传统电容电压均衡策略计算量大,降低了控制器的响应特性。为此,提出一种寻k值均衡方法,根据五分化中项的中项原则,确定处于投入和切除零界状态的模块电压大小,通过一轮比较处理从而获得需要投入和切除的模块编号信息,避免每个控制周期对桥臂模块电压的全排序操作且不会降低电容电压的控制精度。进一步,对寻k值均衡方法设定最大模块电压偏差允许值,减少器件不必要的反复投切。最后在PSCAD/EMTDC中搭建MMC模型,仿真结果表明所提出的改进策略能够以较低的计算量实现电压均衡,提高仿真运行速度,设定最大电压偏差允许值能够显著降低器件开关频率。
[Abstract]:For the modular multilevel converter (modular multilevel converter,MMC) with large quantum modules, the traditional capacitor voltage equalization strategy based on real-time sequencing has a large computational complexity, which reduces the response characteristics of the controller. In this paper, a k-value equalization method is proposed. According to the principle of the middle term of the five differentiation, the voltage of the module in the state of zero input and removal is determined, and the module number information that needs to be put into and removed is obtained by a round of comparison processing. The control precision of capacitor voltage is not reduced by avoiding the full sequence operation of the bridge arm module voltage in each control cycle. Furthermore, the maximum value of module voltage deviation is set for the k-value equalization method, which reduces the unnecessary switching of the device. Finally, the MMC model is built in PSCAD/EMTDC. The simulation results show that the proposed improved strategy can achieve voltage equalization with low computational complexity, improve the simulation operation speed, and set the maximum voltage deviation allowable value to significantly reduce the switching frequency of the device.
【作者单位】：武汉大学电气工程学院;南京南瑞集团公司(国网电力科学研究院);
【基金】：国家自然科学基金项目(51607125) 国家863高技术基金项目(2015AA050101)~~
【分类号】：TM46;TM721.1

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