半隐式延迟解耦电磁暂态仿真方法(二):单端口子模块MMC通用解耦与快速仿真

Semi-implicit Latency Decoupling Technology Based Electromagnetic Transient Simulation(Part Ⅱ): General Decoupling and Fast Simulation for Single-port Sub-module MMC

由于模块化多电平换流器子模块数众多及子模块拓扑的复杂性和时变性,导致仿真精度与效率难以兼顾。该文将半隐式延迟解耦原理用于模块化多电平换流器(modular multilevel converter,MMC)高效电磁暂态仿真建模研究,所得模型具有常规子模块拓扑导纳矩阵恒定、解耦电路简单、计算效率高、方法通用性强等特点。该文首先从MMC单端口子模块状态方程出发,利用矩阵分裂和延迟技术,构建MMC单端口子模块通用半隐式延迟解耦模型,并应用于半桥、全桥和双半桥子模块。然后,基于对模型参数的简化,进一步提出适用于任意单端口子模块拓扑的MMC通用仿真框架,并分析模型的特点,给出计算流程,最后通过算例验证该文方法的准确性和有效性。

Due to the large number of modular multilevel converter(MMC)submodules(SM),as well as the complexity and time-varying of the submodule topology,it is difficult to balance accuracy and efficiency of the solution.In this paper,the semi-implicit latency decoupling and paralleling technology(SILDP)was applied to the research of MMC high-efficiency electromagnetic transient simulation modeling.The obtained model has the characteristics of constant admittance matrix of conventional topological SMs,simple decoupling circuit,high computational efficiency,and general applicability.Starting from the state equation of MMC single-port SM,using matrix splitting and latency technology,a general semi-implicit delay decoupling model of MMC single-port SM was constructed and applied to half-bridge,full-bridge,and double half-bridge SMs.Furthermore,based on the simplification of model parameters,a general decoupling and simulation framework for any single-port sub-modular MMC was proposed.The characteristics of the model were analyzed,and the solution process was presented.The simulation results can verify the accuracy and effectiveness of the proposed method.