ZHU Wan;REN Zuyi;HE Yuqin;ZHAO Qingchun;DAI Guangwu;BAI Yang;XIA Shangxue;XU Ke;

• 1:NR Electric Co.
• 2:Ltd.
• 3:State Grid Quzhou Power Supply Company

Abstract：

To ensure the secure and stable operation of voltage source converter-based high voltage direct current(VSC-HVDC) grids, dedicated stability control systems must be deployed, and effective control strategies are essential for their implementation. The control modes of converter valves and the associated topological relationships in VSC-HVDC grids are analyzed. The transmission capacity of the DC grid and that of the sending-end single station are defined, and corresponding calculation methods are proposed. Based on the difference between the pre-fault transmitted power and the real-time transmission capacity, the surplus power of both the DC grid and the sendingend single station under fault conditions is calculated. From two perspectives—generator tripping based on pre-fault generation output and generator retention based on post-fault residual transmission capacity—a surplus power allocation strategy for generator tripping among sending-end stations is proposed. The proposed method decouples the stability control strategy from DC control modes and grid operating conditions, thereby significantly reducing engineering implementation complexity. The stability control system developed based on the proposed strategy has been validated through real-time closed-loop digital simulation and practical grid operation, demonstrating its applicability to complex DC grids.

Key Words： VSC-HVDC grid;stability control system;DC grid transmission capacity;surplus power allocation;generator tripping

Abstract:

Keywords:

Foundation: 国家重点研发计划（2021YFB2400800）

Authors: ZHU Wan;REN Zuyi;HE Yuqin;ZHAO Qingchun;DAI Guangwu;BAI Yang;XIA Shangxue;XU Ke;

DOI: 10.19585/j.zjdl.202603004

References：

• [1]刘振亚.全球能源互联网跨国跨洲互联研究及展望[J].中国电机工程学报，2016,36(19):5103-5110.LIU Zhenya.Research of global clean energy resource and power grid interconnection[J].Proceedings of the CSEE,2016,36(19):5103-5110.
• [2]刘振亚.特高压交直流电网[M].北京：中国电力出版社，2013.
• [3]温家良，吴锐，彭畅，等.直流电网在中国的应用前景分析[J].中国电机工程学报，2012,32(13):7-12.WEN Jialiang,WU Rui,PENG Chang,et al.Analysis of DC grid prospects in China[J].Proceedings of the CSEE,2012,32(13):7-12.
• [4]汤广福，罗湘，魏晓光.多端直流输电与直流电网技术[J].中国电机工程学报，2013,33(10):8-17.TANG Guangfu,LUO Xiang,WEI Xiaoguang. Multiterminal HVDC and DC-grid technology[J].Proceedings of the CSEE,2013,33(10):8-17.
• [5]王渝红，阳莉汶，江伟，等.直流电网联网设备与控制策略研究综述[J].电网技术，2018,42(1):12-24.WANG Yuhong,YANG Liwen,JIANG Wei,et al. Review on equipment and control strategies of DC power grid[J].Power System Technology,2018,42(1):12-24.
• [6]CIGRE B4.52 Working Group. HVDC grid feasibility study[R].Melbourne:CIGRE,2011.
• [7]HERTEM D V,GHANDHARI M. Multi-terminal VSC HVDC for the European supergrid obstacles[J]. Renewable and Sustainable Energy Reviews,2010(14):3156-3163.
• [8]郭贤珊，梅念，李探，等.张北柔性直流电网盈余功率问题的机理分析及控制方法[J].电网技术，2019,43(1):157-164.GUO Xianshan,MEI Nian,LI Tan,et al.Study on solution for power surplus in Zhangbei VSC-based DC grid mechanism analysis and control method[J].Power System Technology,2019,43(1):157-164.
• [9]郭贤珊，周杨，梅念，等.张北柔直电网的构建与特性分析[J].电网技术，2018,42(11):3698-3707.GUO Xianshan,ZHOU Yang,MEI Nian,et al.Construction and characteristic analysis of Zhangbei flexible DC grid[J].Power System Technology,2018,42(11):3698-3707.
• [10]郭铭群，梅念，李探，等.±500 kV张北柔性直流电网工程系统设计[J].电网技术，2021,45(10):4194-4204.GUO Mingqun,MEI Nian,LI Tan,et al.System design of±500 kV Zhangbei VSC-based DC grid project[J].Power System Technology,2021,45(10):4194-4204.
• [11]梅念，苑宾，李探，等.接入孤岛新能源电场的双极柔直换流站控制策略[J].电网技术，2018,42(11):75-82.MEI Nian,YUAN Bin,LI Tan,et al. Study on control strategy of bipolar VSC station connected to islanded renewable power plant[J]. Power System Technology,2018,42(11):75-82.
• [12]郭贤珊，王晖，卜广全，等.大规模新能源经张北柔直孤岛送出的虚拟频率研究[J].电力工程技术，2020,39(3):1-7.GUO Xianshan,WANG Hui,BU Guangquan,et al. Virtual frequency control of islanded large-scale renewable energy power system delivered by Zhangbei VSC-HVDC[J].Electric Power Engineering Technology,2020,39(3):1-7.
• [13]范新凯，王艳婷，张保会.柔性直流电网的快速电磁暂态仿真[J].电力系统自动化，2017,41(4):92-97.FAN Xinkai,WANG Yanting,ZHANG Baohui.Fast electromagnetic transient simulation for flexible DC power grid[J].Automation of Electric Power Systems,2017,41(4):92-97.
• [14]李德胜，罗剑波.特高压直流配套安全稳定控制系统的典型设计[J].电力系统自动化，2016,40(14):151-157.LI Desheng,LUO Jianbo. Typical design of security and stability control system for UHVDC transmission[J].Automation of Electric Power Systems,2016,40(14):151-157.
• [15]夏海峰，柯贤波，霍超，等.高压直流输电配套稳控系统可靠性分析及对策[J].电工技术，2019(11):106-109.XIA Haifeng,KE Xianbo,HUO Chao,et al.Analysis and countermeasures on reliability of stability control system of HVDC transmission[J]. Electric Engineering,2019(11):106-109.
• [16]俞翔，王杨正，张庆武，等.特高压并联型三端混合直流输电系统功率转带策略[J].电力系统自动化，2020,44(23):150-156.YU Xiang,WANG Yangzheng,ZHANG Qingwu,et al.Power transfer strategy of parallel three-terminal hybrid UHVDC transmission system[J].Automation of Electric Power Systems,2020,44(23):150-156.
• [17]任祖怡，左洪波，吴小辰，等.用于安全稳定控制的高压直流极闭锁判据[J].电力系统自动化，2007,31(10):41-44.REN Zuyi,ZUO Hongbo,WU Xiaochen,et al. HVDC pole blocking detection for security and stability control[J]. Automation of Electric Power Systems,2007,31(10):41-44.
• [18]武传健，梁正堂，黄强，等.基于EEMD和GP的混合直流系统双端保护方案研究[J].智慧电力，2025,53(1):98-106.WU Chuanjian,LIANG Zhengtang,HUANG Qiang,et al.Double-ended protection scheme for hybrid DC system based on EEMD and GP algorithms[J]. Smart Power,2025,53(1):98-106.
• [19]陶军，雷轲，慕腾，等.多区域机组协同配合的优化排序安全稳定控制策略[J].山东电力技术，2024,51(6):12-19.TAO Jun,LEI Ke,MU Teng,et al. An optimizationsorting security and stability control strategy considering generators coordination in multiple regions[J]. Shandong Electric Power,2024,51(6):12-19.
• [20]阚骏，董希建，王敏，等.基于MCMC的电网安全稳定控制系统动态可靠性评估方法[J].电力工程技术，2024,43(3):23-31.KAN Jun,DONG Xijian,WANG Min,et al.Dynamic reliability evaluation method of power grid security and stability control system based on Markov chain Monte Carlo[J].Electric Power Engineering Technology,2024,43(3):23-31.
• [21]李明，赵峥，孟沛彧，等.适用于孤岛风电外送的LCC-DR混合型直流输电系统[J].电力建设，2024,45(4):46-56.LI Ming,ZHAO Zheng,MENG Peiyu,et al.A LCC-DR hybrid HVDC system topology suitable for island windpower transmission[J]. Electric Power Construction,2024,45(4):46-56.
• [22]朱博，徐攀腾，崔远卓，等.连接无源网络的LCCFHMMC混合直流输电系统送端交流故障穿越控制策略[J].高压电器，2024,60(3):151-160.ZHU Bo,XU Panteng,CUI Yuanzhuo,et al.AC fault ridethrough control strategy for LCC-FHMMC hybrid HVDC system with passive network[J].High Voltage Apparatus,2024,60(3):151-160.