| 引用本文: | 张芳,黄河,梁修功.基于超级电容储能的风电经柔性直流并网系统交流故障穿越策略[J].电力自动化设备,2025,45(4):37-44，66 |
| ZHANG Fang,HUANG He,LIANG Xiugong.AC fault ride-through strategy for wind power via flexible DC grid-connected system based on supercapacitor energy storage[J].Electric Power Automation Equipment,2025,45(4):37-44，66 |
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| 摘要: |
| 基于模块化多电平换流器的柔性直流(MMC-HVDC)输电技术是大规模新能源基地并网送出的首选方案，为了解决风电经MMC-HVDC并网系统在受端交流系统发生故障期间的穿越问题，提出一种采用模块化设计的直挂式超级电容储能系统拓扑结构。为了解决实际超级电容参数不一致所导致的储能系统充放电能力削弱的问题，提出冗余子模块数量的计算方法。针对受端交流系统故障，提出基于超级电容储能系统的故障穿越策略，因储能系统建模存在不确定性，基于H∞鲁棒控制理论设计超级电容储能系统双向DC/DC变换器的电流内环控制器。通过仿真验证所提超级电容储能系统拓扑结构和故障穿越策略的正确性、有效性，结果表明各储能子模块的超级电容电压能够实现均衡，并有效抑制直流线路过电压。 |
| 关键词: 海上风电 柔性直流输电系统 超级电容储能 故障穿越 直流过电压 |
| DOI：10.16081/j.epae.202412009 |
| 分类号:TM721.1 |
| 基金项目: |
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| AC fault ride-through strategy for wind power via flexible DC grid-connected system based on supercapacitor energy storage |
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ZHANG Fang, HUANG He, LIANG Xiugong
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Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
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| Abstract: |
| The modular multilevel converter-based high voltage direct current(MMC-HVDC) transmission technology is the preferred solution for grid integration and power delivery from large-scale renewable energy bases. To address the fault ride-through challenges of wind power integrated via MMC-HVDC system during faults in the receiving-end AC system, a modular-designed direct-mounted supercapacitor energy sto-rage system topology is proposed. To solve the weakened charging and discharging ability caused by the inconsistency in practical supercapacitor parameters, a calculation method for determining the number of redundant submodules is proposed. Aiming at the faults at the receiving-end AC system, a fault ride-through strategy based on the supercapacitor energy storage system is developed. Considering uncertainties in the energy storage system modeling, the current inner-loop controller of the bidirectional DC/DC converter in the supercapacitor energy storage system is designed based on the H∞ robust control theory. The correctness and effectiveness of the proposed supercapacitor energy storage system topology and fault ride-through strategy are verified by simulation. The results show that the supercapacitor voltage of each energy storage submodule can be balanced and the DC line overvoltage can be effectively suppressed. |
| Key words: offshore wind power flexible DC transmission system supercapacitor energy storage fault ride-through DC overvoltage |
