并网换流器控制模式发展及弱电网稳定研究  

Recent Development of Grid-connected Inverters and Weak-grid Stabilization

作　　者：梁军[1] 李传玥 LIANG Jun;LI Chuanyue(School of Engineering,Cardiff University,Cardiff,CF243AA,UK)

机构地区：[1]卡迪夫大学工学院,英国卡迪夫CF243AA

出　　处：《电网技术》2022年第10期3703-3711,共9页Power System Technology

摘　　要：并网换流器逐步渗透电网,这将改变电网的能源结构并提升换流器在电网中的责任。该责任将需要并网换流器具备类似同步发电机的功能,由此促生了新的控制形态-构网控制。该文将详述目前构网换流器的发展现状及趋势,包括构网控制的定义、当前不同的控制种类及形态、电网规范讨论、示范项目以及挑战,同时对比构网控制与传统跟网控制在小信号稳定性上的特点及区别。此外,随着更多远端清洁能源的连接,弱电网带来的稳定性问题已经引起广泛担忧。该文提出一种简便的跟网控制调参思路,以确保其能够额定运行于即使短路比(shortcircuitratio,SCR)=1的极端弱电网。由此揭示了弱电网中除构网换流器外,跟网换流器亦可发挥其作用。High penetration of grid-connected inverters is changing the forms and roles of resources in power grids.The inverters are required to be functioned like the synchronous generators,which leads to a new form of inverter control-gridforming control.In this paper,the development of grid-forming control is comprehensively reviewed,including its definition,variants,grid code discussions,demonstration projects and challenges.The characteristics in terms of small-signal stability are compared between the grid-forming control and the conventional grid-following control.Increasing renewable resources are integrated from the remote connection point of the grid,which leads to a greatly concerned issue of weak-grid instability.A simple and effective tuning method is provided to enable the grid-following inverter to connect to an extreme weak grid even at SCR=1.It is revealed that besides grid-forming inverters,a grid-following inverter can achieve satisfactory stability in a weak grid.

关 键 词：并网换流器 构网控制 跟网控制 弱电网稳定 

分 类 号：TM721[电气工程—电力系统及自动化]