新能源送出柔性直流输电系统送受两端构网型控制OA
Grid-forming Control for Sending and Receiving Ends of Renewable Energy Integrated VSC-HVDC Transmission Systems
在大规模新能源接入电力系统背景下,电网频率和电压稳定问题愈发突出,采用传统控制的柔性直流输电系统缺乏对受端电网的主动支撑.为此,文中提出一种具有主动支撑能力的柔性直流输电系统送受两端构网型控制,其中,送端换流站采用孤岛控制,受端换流站采用基于直流电压调节的混合同步控制.混合同步控制将跟网型控制与构网型控制柔性结合,等效增大同步控制环中的惯性和阻尼,从而提升系统的暂态稳定性.为在故障期间维持换流器电压源特性,提出了基于虚拟阻抗的换流器故障限流控制方法,并研究了故障限流控制对系统稳定性的影响.最后,基于所提出的柔性直流输电系统构网型控制结构,提出了系统送受两端协调控制策略,实现了"无通信"调用送端新能源能量参与受端电网频率调节.在PSCAD/EMTDC中搭建了海上风电双端柔性直流输电系统仿真模型,验证了所提柔性直流输电系统送受两端构网型控制的有效性.
Under the background of large-scale integration of renewable energy into power systems,the problems of power grid frequency and voltage stability have become increasingly prominent.The voltage source converter based high voltage direct current(VSC-HVDC)transmission system using conventional control lacks active support to the receiving-end grid.Therefore,a grid-forming control with active support capability for sending and receiving ends of VSC-HVDC transmission systems is proposed,in which the sending-end converter station adopts island control,and the receiving-end converter station adopts a hybrid synchronization control based on DC voltage regulation.The hybrid synchronization control flexibly combines grid-following control and grid-forming control,equivalently increasing the inertia and damping in the synchronous control loop,thereby enhancing the system transient stability.To maintain the voltage source characteristics of the converter during faults,a converter fault current limiting control method based on virtual impedance is proposed,and the impact of fault current limiting control on the system stability is studied.Finally,based on the proposed grid-forming control structure for VSC-HVDC transmission systems,a coordinated control strategy for sending and receiving ends of the system is proposed,achieving the participation of renewable energy dispatched from the sending end without communication in the frequency regulation of the receiving-end power grid.A simulation model of an offshore wind power two-terminal VSC-HVDC transmission system is built in PSCAD/EMTDC,validating the effectiveness of the proposed grid-forming control for sending and receiving ends of VSC-HVDC transmission systems.
甘慧辰;肖晃庆;郭铸;黄伟煌
华南理工大学电力学院,广东省 广州市 510641华南理工大学电力学院,广东省 广州市 510641直流输电技术全国重点实验室(南方电网科学研究院有限责任公司),广东省 广州市 510663直流输电技术全国重点实验室(南方电网科学研究院有限责任公司),广东省 广州市 510663
柔性直流输电系统新能源构网型控制混合同步控制暂态稳定性故障穿越故障限流控制虚拟阻抗
voltage source converter based high voltage direct current(VSC-HVDC)transmission systemrenewable energygrid-forming controlhybrid synchronization controltransient stabilityfault ride-throughfault current limiting controlvirtual impedance
《电力系统自动化》 2026 (11)
40-51,12
智能电网国家科技重大专项资助项目(2024ZD0800900). This work is supported by Smart Grid-National Science and Technology Major Project(No.2024ZD0800900).
评论