柔性直流系统虚拟同步机控制策略研究  

Research on Virtual Synchronous Machine Control Strategy for Flexible DC System

作　　者：李泰 鲁庆华 孙攀磊 芦开平 程晓磊 LI Tai;LU Qing-hua;SUN Pan-lei;LUKai-ping;CHEN Xiao-lei(XJ Electric Co.,Ltd.,Xuchang 461000,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000

出　　处：《电力电子技术》2025年第3期57-61,共5页Power Electronics

摘　　要：针对基于电压源型多端柔性直流输电系统采用d,q双环控制,不能提供系统惯性的问题,提出一种自适应下垂控制策略,采用虚拟同步发电机技术,根据交流系统频率变化情况调整功率分配,提升了系统的惯性水平,从而解决了直流系统在扰动下的稳定问题,对弱交流电网的提供支撑。同时针对渝鄂工程在恩施电网检修期间发生的N-2故障,通过仿真验证,对比原有的电流矢量控制策略,结果表明新策略在弱系统下的有效性,为未来新能源领域的弱系统接入、惯量补偿以及电压支撑提供了技术支持。Aiming at the problem that the voltage source-based multi-terminal flexible DCtransmission system adopts dq double-loop control and fails to provide system inertia,an adaptive droop control strategy is proposed,which makes use of the virtual synchronous generator technology to adjust the power distribution according to the frequency change of the AC system,and improves the inertia level of the system,so as to solve the stability problem of the DC system under perturbation,and to provide support for the weak ACpower grid.Meanwhile,for the N-2 fault that occurred during the overhaul of the Enshi power grid in the Yu-E project,it is verified by simulation,comparing with the orig-inal current vector control strategy,and the results show the effectiveness of the new strategy under the weak system,which provides technical support for the weak system access,inertia compensation,and voltage support in the field of new energy in the future.

关 键 词：弱交流电网 虚拟同步发电机技术 自适应下垂控制 

分 类 号：TM7[电气工程—电力系统及自动化]