MMC-HVDC向无源网络供电的机电暂态等效建模研究  

Research on Electromechanical Transient Equivalent Modeling of MMC-HVDC Connected to Passive Network

作　　者：安文宇 黄天啸[2] 任建文[1] 刘丽丽 AN Wenyu;HUANG Tianxiao;REN Jianwen;LIU Lili(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;North China Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]华北电力科学研究院有限责任公司,北京100045

出　　处：《华北电力大学学报（自然科学版）》2022年第2期90-96,105,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司总部科技项目(5100-202055001A-0-0-00)。

摘　　要：针对无源网络通过柔性直流输电系统接入大电网的机电暂态仿真问题,建立了MMC-HVDC向无源网络供电时无源侧机电暂态仿真的电压源和电流源模型,并对两种模型进行了原理分析和特性对比,得出了适用性结论。首先忽略MMC内部复杂的动态过程,仅保留无源系统及内外环控制器,建立了MMC-HVDC无源侧机电暂态电压源模型。之后对内环控制器的动态过程进行简化,建立了MMC-HVDC无源侧机电暂态电流源模型。将两种模型与电磁暂态精确模型进行不同工况下的运行特性对比,验证了不同程度扰动下所建机电暂态模型的有效性。对于小扰动分析,两种模型均适用,电流源模型能达到很好的控制效果;对于大扰动分析,电压源模型更适用。最后分析了内环控制器参数对于不同工况下两种机电暂态模型仿真结果的影响。Aiming at the problem of electromechanical transient simulation of passive network connecting to large power grid through flexible DC transmission system,we established the voltage source and current source models of electromechanical transient simulation of passive side when MMC-HVDC supplies power to passive network.We analyzed the principle of the two models and compared the characteristics to obtain the applicability conclusion.Ignoring the complex dynamic process inside the MMC,we only retained the passive system and the inner and outer loop controllers to establish the voltage source model of MMC-HVDC passive side electromechanical transient.Afterwards,the dynamic process of the inner loop controller was simplified to establish the current source model of MMC-HVDC passive side electromechanical transient.Under different operating conditions,we compared operation characteristic of the models with that of the MMC-HVDC electromagnetic transient accurate model to verify the validity of the electromechanical transient models under different degrees of disturbance.For small disturbance analysis,the two models are both applicable,and the current source model can achieve good control effect while for large disturbance analysis,the voltage source model is more applicable.Finally,we analyzed the influence of inner loop controller parameters on the simulation results of two electromechanical transient models under different conditions.

关 键 词：模块化多电平换流器型直流输电 机电暂态 电磁暂态 无源网络 仿真 

分 类 号：TM727[电气工程—电力系统及自动化]