应用于复杂交直流网络的箝位双子模块型MMC快速仿真模型

发布时间：2018-07-08 11:06

本文选题：模块化多电平换流器 + 电磁暂态仿真　；参考：《电网技术》2017年09期

【摘要】：模块化多电平换流器(modular multilevel converter,MMC)在复杂交直流网络中有广阔的应用前景。随着MMC容量和电压等级的提高,MMC的暂态行为对复杂交直流网络的影响不能忽略,有必要建立适用于复杂交直流网络仿真研究的MMC快速仿真模型。针对箝位双子模块型MMC拓扑建立了快速仿真模型。利用辅助元件对桥臂电路结构进行了简化;通过动态计算可控电压源,对桥臂内部复杂的子模块开关动态过程进行了平均化处理,避免了大规模节点导纳矩阵的动态求解。上述快速仿真模型不仅能够准确地模拟MMC在稳态、交流故障、换流器闭锁、直流故障清除和恢复等动态过程中的特性,而且具有较高的仿真效率。通过与基于分立元件的详细仿真模型进行对比,验证了所提模型的仿真精度和仿真效率。
[Abstract]:Modularized multilevel converter (modular multilevel) has a broad application prospect in complex AC / DC networks. With the increase of MMC capacity and voltage level, the influence of transient behavior of MMC on complex AC / DC networks can not be ignored. It is necessary to establish a fast MMC simulation model suitable for the simulation of complex AC / DC networks. A fast simulation model is established for the MMC topology with two sub modules clamped. The circuit structure of the bridge arm is simplified by the auxiliary element, and the dynamic process of the complex sub-module switch in the arm is averaged through the dynamic calculation of the controllable voltage source, which avoids the dynamic solution of the large-scale node admittance matrix. The fast simulation model can not only accurately simulate the characteristics of MMC in dynamic processes such as steady state, AC fault, converter latch, DC fault clearance and recovery, but also have high simulation efficiency. The simulation accuracy and efficiency of the proposed model are verified by comparison with the detailed simulation model based on discrete components.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);国网山东省电力公司电力科学研究院;
【基金】：国家重点研发计划项目(2016YFB0901004) 中国博士后科学基金项目(158450)~~
【分类号】：TM46

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