电网技术2026，Vol.50Issue(9)：3503-3512,中插1-中插3,13.DOI:10.13335/j.1000-3673.pst.2026.0717
接入大电网的定频构网与虚拟同步机控制同步稳定性比较研究
Comparative Studies on Synchronization Stability of Frequency-fixed Grid-forming Control and Virtual Synchronous Generator Control in Large Power Grids
摘要
Abstract
Frequency-fixed grid-forming(FF-GFM)control is a novel grid-forming control architecture.In future power systems dominated by converter-interfaced generation(CIG),CIG can operate as a constant-frequency,constant-voltage source within its capacity,significantly reducing system frequency and synchronous dynamics and fundamentally resolving synchronization instability issues.In this paper,it is found that when the proportion of FF-GFM CIG is low and insufficient to dominate the system dynamics,the system may struggle to achieve global fixed-frequency characteristics;however,FF-GFM can still play a positive role in grid support and offers notable advantages over virtual synchronous generator(VSG)control.Specifically,FF-GFM can be implemented simply on an existing GFM converter with VSG control by introducing an intentional deadband in the power.Then,using the describing function method,we proved that adding a deadband can improve the damping ratio of low-frequency oscillations.Moreover,by analyzing the stability region and system trajectory during and after the fault,it can be shown that FF-GFM enhances large-disturbance synchronization stability and effectively increases the fault-clearing time.Finally,the conclusions are verified with Hardware-in-the-loop simulations.These findings indicate that FF-GFM is highly compatible with existing VSG control in implementation and can effectively enhance synchronization stability,even during the transitional stage of low-penetration integration,thereby supporting the gradual transition of the power system.关键词
构网型/死区/定频构网控制/描述函数/振荡稳定性/大扰动稳定性Key words
grid-forming control/deadband/frequency-fixed grid-forming control/describing function/oscillatory stability/large-disturbance stability分类
信息技术与安全科学引用本文复制引用
雷振宇,黄震,宋修贤,陈磊,侯凯元,夏德明,闵勇..接入大电网的定频构网与虚拟同步机控制同步稳定性比较研究[J].电网技术,2026,50(9):3503-3512,中插1-中插3,13.基金项目
国家电网有限公司东北分部科技项目:新型电力系统的电力电子设备控制重构技术研究(52992625000Y).Project Supported by Northeast Branch of State Grid Corporation of China:Research on Control Reconstruction Technologies for Power Electronic Devices in New Power Systems(52992625000Y). （52992625000Y）
