摘要
基于模块化多电平换流器的背靠背柔性直流输电系统(back to back modular multilevel converter based high voltage directcurrent,Back-to-BackMMC-HVDC)可实现区域电网的异步互联,提高电网可靠性。为更好地研究背靠背MMCHVDC接入后的交直流系统互耦特性,需建立兼顾区域电网仿真效率与精确模拟MMC-HVDC系统动态特性的交直流混合模型。研究了MMC-HVDC运行原理与控制策略,基于电力系统全数字仿真装置(advanceddigitalpowersystem simulator,ADPSS)搭建含背靠背MMC-HVDC系统的交直流电网机电-电磁混合模型。通过仿真对比,验证了上述MMC-HVDC电磁暂态模型及其控制系统的正确性;基于混合模型进行了交直流电网机电-电磁混合仿真研究,并与对交流大电网进行等值简化后的纯电磁模型进行对比分析。结果表明,与将交流电网等效为理想电压源加等值阻抗的纯电磁暂态模型相比,混合仿真模型可更好地体现交流系统特性,更贴近实际工程,为研究交直流互联电网提供了较好的参考。
High voltage direct current based on back-to-back modular multilevel converter(MMC-HVDC)can realize asynchronous interconneetion of two regional power grids,thus improving reliability of power grid.To study mutual coupling characteristics of the AC/DC system with MMC-HVDC,a hybrid simulation model of an actual back-to-back MMC-HVDC project is built using advanced digital power system simulator(ADPSS).Transient simulations are carried out to verify the function of MMC-HVDC,and fault simulations are performed based on the hybrid electromechanical-electromagnetic transient model.Results show that the fault response of the hybrid simulation model is more acetate than electromagnetic transient model,providing a better reference for analysis and design of AC/DC hybrid grid.
作者
蔡普成
向往
彭红英
穆清
文劲宇
CAI Pucheng;XIANG Wang;PENG Hongying;MU Qing;WEN Jinyu(State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan430074,Hubei Province,China;China Electric Power Research Institute,Haidian District,Beijing100192,China)
出处
《电网技术》
EI
CSCD
北大核心
2018年第12期3888-3894,共7页
Power System Technology
