| 引用本文: | 王 琦,丁 芮,成 硕,等.基于盈余功率分配的海上风电经柔直送出系统故障穿越策略[J].电力系统保护与控制,2025,53(24):165-175.[点击复制] |
| WANG Qi,DING Rui,CHENG Shuo,et al.Fault ride-through strategy for offshore wind power via VSC-HVDC based on surplus power allocation[J].Power System Protection and Control,2025,53(24):165-175[点击复制] |
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| 基于盈余功率分配的海上风电经柔直送出系统故障穿越策略 |
| 王琦1,丁芮2,成硕3,刘福锁4,5,王玉4,5,黄锡芳4,5,余修勇1 |
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| (1.南京师范大学电气与自动化工程学院，江苏 南京 210023;2.国网含山供电公司,安徽 马鞍山 238100;
3.国网江苏省电力有限公司连云港市赣榆区供电分公司，江苏 连云港 222100;4.智能电网保护和运行控制
国家重点实验室，江苏 南京 211106;5.南瑞集团有限公司(国网电力科学研究院)，江苏 南京 241000) |
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| 摘要: |
| 针对海上风电孤岛经柔直并网系统交流侧故障引起直流过电压的问题，提出一种柔直系统降压控制与海上风电场降电流控制协调配合的故障穿越方法。故障期间，首先将柔直子模块与直流电压解耦，充分利用柔直系统自身故障穿越能力。然后根据系统能量特性，提出一种盈余功率分配的能量等面积法，直接刻画故障期间柔直系统送端功率运行安全域。同时，建立计及低压穿越策略风机与柔直连接的暂稳态等效模型，推导暂稳态期间交流电压与风电场有功输出的关系，实现对海上风电的降载功率精确控制。最后在基于PSCAD/EMTDC的如东海上风电场经柔直并网仿真平台进行验证。仿真结果表明，所提控制策略无需依赖新装耗能电阻，降低能量损耗，有效解决直流过电压问题，具有更高经济性。 |
| 关键词: 柔性直流 海上风电 故障穿越 能量等面积法 精准降功率 |
| DOI：10.19783/j.cnki.pspc.250094 |
| 投稿时间：2025-01-22修订日期：2025-06-30 |
| 基金项目:国家自然科学基金项目资助(52407111)；智能电网保护和运行控制国家重点实验室项目资助(SGNR 0000KJJS2302146) |
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| Fault ride-through strategy for offshore wind power via VSC-HVDC based on surplus power allocation |
| WANG Qi1,DING Rui2,CHENG Shuo3,LIU Fusuo4,5,WANG Yu4,5,HUANG Xifang4,5,YU Xiuyong1 |
| (1. College of Electrical and Automation Engineering, Nanjing Normal University, Nanjing 210023, China;
2. State Grid Hanshan Power Supply Company, Maanshan 238100, China; 3. Lianyungang Ganyu District Power
Supply Branch of State Grid Jiangsu Power Company, Lianyungang 222100, China; 4.State Key
Laboratory of Smart Grid Protection and Operation Control, Nanjing 211106, China;
5. Nanrui Group Limited, State Grid Electric Power Research Institute, Nanjing 241000, China) |
| Abstract: |
| To address the DC overvoltage issue caused by AC-side faults in islanded offshore wind farms integrated via VSC-HVDC systems, this paper proposes a coordinated fault ride-through method combining VSC-HVDC voltage reduction control and offshore wind farm current reduction control. During the fault, the submodules of the VSC-HVDC system are first decoupled from the DC voltage to fully utilize its inherent fault ride-through capability. Then, based on system energy characteristics, a surplus power allocation-based energy equal-area method is proposed to directly characterize the safe operating region of VSC-HVDC sending-end power during faults. Meanwhile, a transient quasi-steady equivalent model of the wind farm with low-voltage ride-through strategies connected to the VSC-HVDC system is established. The relationship between AC voltage and the active power output of the wind farm during the quasi-steady process is derived, enabling precise derating control for the offshore wind farm. Finally, the proposed control strategy is validated on a PSCAD/EMTDC-based simulation platform based on the HVDC-connected Rudong offshore wind farm project. The simulation results demonstrate that the proposed control strategy effectively mitigates DC overvoltage without relying on additional braking resistors, thereby reducing energy losses improving economic performance. |
| Key words: VSC-HVDC offshore wind power fault ride-through energy equal-area method precise power derating |
