| 引用本文: | 李国庆,徐亚男,江守其,等.海上风电经柔性直流联网系统受端交流故障穿越协调控制策略[J].电力系统保护与控制,2022,50(7):111-119.[点击复制] |
| LI Guoqing,XU YananJ,IANG Shouqi,et al.Coordinated control strategy for receiving-end AC fault ride-through of an MMC-HVDCconnecting offshore wind power[J].Power System Protection and Control,2022,50(7):111-119[点击复制] |
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| 摘要: |
| 针对海上风电经柔性直流联网系统受端交流故障导致的直流过电压问题，提出了直流过电压协调抑制策略。针对单极直流过电压，通过合理切换双极MMC控制模式，可使故障极MMC主动维持直流电压稳定。并设计了风电场精确减载控制策略，以保证非故障极MMC满载运行，从而降低单极MMC退出对受端交流电网的影响。针对双极直流过电压，设计了一种基于本地直流电压测量信息的风电场减载控制策略，即根据直流电压变化率及偏差量主动降低风电场有功出力，以抑制直流电压上升率及幅值。并提出了附加桨距角控制及其参数选取原则，使风电场与各换流站内电容共同维持直流电压稳定，提高系统故障穿越能力。最后，基于RTLAB OP5600实时数字仿真平台搭建了系统仿真模型。不同受端交流故障情况下的仿真结果表明，所提直流过电压协调抑制策略可保证直流电压在安全运行范围，维持系统安全稳定运行。 |
| 关键词: 柔性直流输电 盈余功率 交流故障穿越 风电场减载 协调控制策略 |
| DOI：DOI: 10.19783/j.cnki.pspc.210842 |
| 投稿时间：2021-07-06修订日期：2021-11-12 |
| 基金项目:国家自然科学基金联合基金项目资助(U2066208)； 博士科研启动基金项目资助(BSJXM-2021105) |
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| Coordinated control strategy for receiving-end AC fault ride-through of an MMC-HVDCconnecting offshore wind power |
| LI Guoqing,XU YananJ,IANG Shouqi,WANG Limeng,XIN Yechun,WANG Lixin |
| (Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology,
Ministry of Education (Northeast Electric Power University), Jilin 132012, China) |
| Abstract: |
| To deal with the problem of receiving-end AC fault ride-through of an MMC-HVDC system connecting offshore wind power, coordinated suppression strategies of DC overvoltage are proposed to achieve the receiving-end AC fault ride-through. For a monopolar DC overvoltage, by reasonably switching the control mode of a bipolar MMC, the fault pole MMC can actively maintain DC voltage stability. The precise load-shedding control strategy of a wind farm is designed to ensure the full load operation of a non-fault pole MMC, so as to reduce the impact of monopolar MMC outage on the receiving-end system. For the bipolar DC overvoltage, a wind farm load-shedding control strategy based on local DC voltage measurement information is designed. This can actively reduce the output power of the wind farm according to the DC voltage change rate and deviation, and effectively suppress the rise rate and amplitude of DC voltage. Then additional pitch angle control and its parameter selection principle are proposed to make the wind farm and the capacitors in each converter station jointly maintain the stability of DC voltage, so as to improve the fault ride-through capability of the system. Finally, based on the RTLAB OP5600 real-time digital simulation platform, the system simulation model is built. The simulation results under different receiving-end AC faults show that the proposed coordinated suppression strategies of DC overvoltage can effectively ensure the DC voltage remains in a safe operational range, and maintains the safe and stable operation of the system.
This work is supported by the Joint Funds of the National Natural Science Foundation of China (No. U2066208). |
| Key words: MMC-HVDC surplus power AC fault ride-through wind farm load-shedding coordinated control strategy |
