山东电力技术2026，Vol.53Issue(8)：73-83,11.DOI:10.20097/j.cnki.issn1007-9904.250680
柔直互联光储充系统离网协同控制策略研究
Research on Off-grid Cooperative Control Strategy for VSC-DC Intertied Photovoltaic-storage-charging System
摘要
Abstract
To tackle the challenge that a single control strategy cannot balance smooth transition and emergency support for the photovoltaic storage charging integrated system connected to a flexible DC intertie under dual off grid scenarios encompasses planned and unplanned modes,this paper proposes a hierarchical time sequence cooperative control strategy.Firstly,the system topology comprising PV,energy storage,and VSC DC intertie is constructed,and a bottom-layer control model based on adaptive switching between Grid Following and Grid Forming modes is established.Secondly,for planned off grid scenarios,an active transition mechanism involving capacity preparation,smooth migration and flexible restoration is designed.By locking the state of charge(SOC)of the energy storage system before off grid operation and scheduling load priority,seamless connection of source and load power is achieved.For unplanned off grid scenarios,a hierarchical emergency response mechanism triggered by transient voltage and frequency characteristics is proposed,leverages the virtual inertia of GFM control combined with millisecond-level load shedding to provide rigid voltage support.Finally,simulation results based on PSCAD and EMTDC platforms demonstrate that the voltage fluctuations of AC and DC buses are negligible under planned off grid conditions,ensuring continuous supply to critical loads.Under unplanned off grid conditions,the DC bus voltage dip can be stabilized within 0.2 s,with the energy storage system rapidly compensating for power deficits and no frequency violation occurring.This strategy effectively enhances the off grid resilience of high penetration renewable energy station areas,offering a feasible technical approach for the islanded safe operation of new distribution systems.关键词
柔性直流互联/光储充一体化系统/离网策略/储能管理Key words
VSC-DC intertied system/photovoltaic-storage-charging integrated system/off-grid strategy/energy storage management分类
信息技术与安全科学引用本文复制引用
王灏,刘均鹏,颜廷利,李明洋,曹戈,孙凯祺..柔直互联光储充系统离网协同控制策略研究[J].山东电力技术,2026,53(8):73-83,11.基金项目
山东省自然科学基金项目(ZR2022QE117) （ZR2022QE117）
国网山东省电力公司科技项目"考虑多低压台区柔性互联的光储充一体化充电站控制策略研究"(2024A-074). Shandong Provincial Natural Science Foundation(ZR2022QE117) （2024A-074）
Science and Technology Project of State Grid Shandong Electric Power Company"Research on Control Strategies for Integrated Photovoltaic-Storage-Charging Stations With Flexible Interconnection of Multiple Low-Voltage Distribution Areas"(2024A-074). （2024A-074）
