摘要
多端柔性直流输电系统中,采用柔直内外环控制无法为受端无源网络提供惯性支撑。传统的虚拟同步发电机(TVSG)控制,可以为无源网络提供惯性支撑,但只能实现无源网络的一次调频。针对此问题,提出一种虚拟调频器(virtual frequency regulator,VFR)控制。VFR控制引入角频率和直流电压偏差到TVSG控制中,使连接无源网络的换流站具备无差调频性能,且依据直流电压的变化调节功率变化,实现功率平衡。在PSCAD/EMTDC中搭建含有无源网络的多端柔性直流系统模型,验证了VFR控制策略的有效性。
In the multi terminal flexible direct current(DC)transmission system,the flexible direct inner and outer loop control can not provide inertial support for the receiving end passive network.Traditional virtual synchronous generator(TVSG)control can provide inertia support for passive network,but it can only realize primary frequency regulator of passive network.To solve this problem,the virtual frequency regulator(VFR)control was proposed.In the VFR control,the angle frequency and DC voltage deviation were introduced into the TVSG control,so that the converter station connected to the passive network had unbiased frequency modulation performance,and the power change was adjusted according to the change of DC voltage to achieve power balance.In PSCAD/EMTDC,a multi terminal flexible DC system model with passive network was built for simulation,and the effectiveness of VFR control strategy was verified.
作者
罗兰
王渝红
宋瑞华
毕经天
陈诗昱
万良彬
LUO Lan;WANG Yuhong;SONG Ruihua;BI Jingtian;CHEN Shiyu;WAN Liangbin(College of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;China Electric Power Research Institute,Beijing 100192,China)
出处
《电气传动》
2022年第15期61-67,共7页
Electric Drive
基金
国家电网公司基础前瞻科技项目:含多电力电子装备电力系统宽频振荡稳定分析及量化评估研究(SGTYHT/18-JS-206)
四川省科技计划资助项目(2019YJ0114)。
关键词
多端柔性直流
无源网络
虚拟同步发电机
虚拟调频器控制
无差调频
multi terminal flexible direct current(DC)
passive network
virtual synchronous generator(VSG)
virtual frequency regulator control
unbiased frequency regulator
