适用于模块化多电平换流器实时仿真的建模方法

发布时间：2019-01-05 19:16

【摘要】：为了实现模块化多电平换流器(MMC)系统的实时仿真,采用理想变压器模型法对MMC进行了模型分割。针对模型分割联解信号延时导致的波形失真问题,提出了采用插值预测和超前预测分别对串行和并行实时仿真延时进行补偿的方法。此外,为了进一步提高模型分割后子模块群组的计算速度,提出了MMC子模块网络的开关函数等效模型和电磁暂态数值模型,并推导了数值模型中子模块输出电压和电容电压的差分方程。然后,以21电平MMC逆变电路为例,将上述MMC建模方法与原整体模型进行了仿真对比分析。结果表明,所提插值预测的方法有效改善了MMC分割模型的稳定性,且具有极高的仿真精度。所提开关函数模型和电磁暂态数值模型均具有很好的加速效果,其中,电磁暂态数值模型与详细模型的仿真结果高度吻合。所提出的建模方法适用于MMC实时仿真测试平台的构建。
[Abstract]:In order to realize the real time simulation of the modularized multilevel converter (MMC) system, the ideal transformer model method is used to segment the MMC model. In order to solve the waveform distortion problem caused by the delay caused by model partitioning, a method of compensating serial and parallel real-time simulation delay by interpolation prediction and advanced prediction is proposed. In addition, in order to further improve the computing speed of submodule groups after model segmentation, the switching function equivalent model and electromagnetic transient numerical model of MMC submodule network are proposed. The difference equations of output voltage and capacitance voltage of the numerical model neutron module are derived. Then, taking 21 level MMC inverter circuit as an example, the above MMC modeling method is compared with the original whole model. The results show that the proposed interpolation prediction method can effectively improve the stability of the MMC segmentation model and has a high simulation accuracy. Both the switching function model and the electromagnetic transient numerical model have good acceleration effect, and the simulation results of the electromagnetic transient model are in good agreement with the simulation results of the detailed model. The proposed modeling method is suitable for the construction of MMC real-time simulation test platform.
【作者单位】：贵州大学电气工程学院;
【基金】：国家自然科学基金资助项目(51467003)~~
【分类号】：TM46

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