CAJ | 학술논문

针对模块化多电平换流器(modular multilevel converter，MMC)电磁暂态仿真耗时过长的问题，提出了2种MMC快速仿真模型。通过分析MMC子模块原理，提出将 MMC 桥臂等效为自定义数值计算模块与受控电压源组合的数值计算详细模型；并在该模型的基础上设计了一种将独立子模块电磁暂态模型和一般子模块数值计算模型结合的混合模型仿真方法，弥补了数值计算模型难以模拟子模块电磁暂态过程的缺陷。为了进一步提高模型的仿真速度，通过简化MMC的电压均衡控制及子模块状态的差异性，建立了数值计算平均值模型。在PSCAD/EMTDC上搭建MMC-HVDC模型，对所提出的快速仿真模型及仿真方法的有效性进行了验证。
침대모괴화다전평환류기(modular multilevel converter，MMC)전자잠태방진모시과장적문제，제출료2충MMC쾌속방진모형。통과분석MMC자모괴원리，제출장 MMC 교비등효위자정의수치계산모괴여수공전압원조합적수치계산상세모형；병재해모형적기출상설계료일충장독립자모괴전자잠태모형화일반자모괴수치계산모형결합적혼합모형방진방법，미보료수치계산모형난이모의자모괴전자잠태과정적결함。위료진일보제고모형적방진속도，통과간화MMC적전압균형공제급자모괴상태적차이성，건립료수치계산평균치모형。재PSCAD/EMTDC상탑건MMC-HVDC모형，대소제출적쾌속방진모형급방진방법적유효성진행료험증。
To shorten the time expended in electromagnetic transient simulation for modular multilevel converter (MMC), two kinds of fast simulation models are proposed. Through analyzing the principle of the sub-module of MMC, it is put forward to define the bridge arms of MMC as a detailed numerical calculation model, which is composed of a self-defined numerical calculation model and controlled voltage source; on the basis of this model, a simulation method for a hybrid model, which combines electromagnetic transient model of independent sub-module with numerical calculation model for common sub-module, is designed to remedy the defect that it is hard for numerical calculation model to simulate electromagnetic transient process of sub-module. To further improve simulation speed of this model, through simplifying the voltage balancing control of MMC and the difference among sub-modules an averaged model of numerical calculation is established. An MMC-HVDC model is constructed on a platform of PSCAD/EMTDC, and the effectiveness of the proposed fast numerical calculation models and hybrid simulation method are verified.