向海岛电网供电的MMC-HVDC有源/无源切换控制策略  

Active/passive switching control strategy for MMC-HVDC connected to an island power grid

作　　者：马文忠[1] 古丽帕丽·赛力江 周冠宇[1] 孙鹏[1] 董磊[1] MA Wenzhong;GU LIPALI·Sailijiang;ZHOU Guanyu;SUN Peng;DONG Lei(College of New Energy,China University of Petroleum(East China),Qingdao 266580,China;State Grid Xinjiang Electric Power Co.,Ltd.Urumqi Power Supply Company,Urumqi 830000,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]国网新疆电力有限公司乌鲁木齐供电公司,新疆乌鲁木齐830000

出　　处：《电力系统保护与控制》2020年第21期157-165,共9页Power System Protection and Control

基　　金：国家自然科学基金项目资助(51777216);山东省自然科学基金项目资助(ZR2018MEE040,ZR2019MEE094)。

摘　　要：基于模块化多电平换流器的直流输电系统(Modular Multilevel Converter based High-voltage Direct Current,MMC-HVDC)可为海岛电网等重要领域供电,当海岛电网处于有源和无源网络切换过程中时,存在有功功率不平衡、交流电压振荡等不稳定问题。因此,提出一种向海岛电网供电的MMC-HVDC有源/无源切换控制策略,该控制策略对外环功率控制和相角控制进行优化,消除切换时刻的瞬时有功功率不平衡,实现海岛电网的平稳切换。最后在PSCAD/EMTDC中搭建三相MMC仿真模型。仿真结果表明,在所提出控制策略的作用下,系统在有源、无源及两者切换时刻皆可正常运行,验证了所提控制方法的有效性和正确性。A Modular Multilevel Converter-based High-voltage Direct Current(MMC-HVDC)can provide power to important areas such as island power grids.When island power grids are in the process of active and passive network switching,there are problems of instability such as active power imbalance and AC voltage oscillation.Therefore,an active/passive switching control strategy for an MMC-HVDC connected to an island power grid is proposed.This control strategy is optimized for outer loop power control and phase angle control.These eliminate the instantaneous active power imbalance of the island power grid at the moment of active/passive network switching,and can achieve a smooth switching of the island power grid.Finally,a three-phase MMC simulation model is built in PSCAD/EMTDC.The simulation results show that under the action of the proposed control strategy,the system can operate normally at the time of active,passive and both switching times.The results verify the effectiveness and correctness of the proposed control method.

关 键 词：模块化多电平换流器 海岛电网 有源网络 无源网络 切换控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]