| 引用本文: | 程 鹏,任 倩,盛诗雯,等.电磁式互感器二次电缆引起MMC孤岛系统高频谐振机理研究[J].电力系统保护与控制,2025,53(19):89-100.[点击复制] |
| CHENG Peng,REN Qian,SHENG Shiwen,et al.Research on high-frequency resonance mechanism in MMC islanded systems caused by secondary cables of electromagnetic instrument transformers[J].Power System Protection and Control,2025,53(19):89-100[点击复制] |
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| 摘要: |
| 随着“双碳”战略推进，我国大力发展风电、光伏等新能源。处于电网末端的新能源场站因缺乏交流电源支撑，需依赖柔性直流输电技术(modular multilevel converter-high voltage direct current, MMC-HVDC)实现并网，但电力电子变流器的广泛应用引发了高频谐振的问题。首先，针对新能源场站经柔直并网中的高频谐振问题，建立了包含电磁式电压/电流互感器及其二次电缆在内的MMC孤岛系统主回路与控制环节的数学模型。其次，用π型电路等效电磁式电压/电流互感器二次电缆并对其进行特性分析。然后，对综合考虑电磁式电压/电流互感器二次电缆的MMC孤岛系统展开稳定性分析，明确了电磁式电压/电流互感器二次电缆的传变特性导致孤岛系统发生高频谐振的机理。最后，在PSCAD/EMTDC中进行仿真验证。结合现场试验，证明了所提电磁式电压/电流互感器二次电缆引起孤岛系统高频谐振机理的准确性。 |
| 关键词: 电磁式电压互感器 电磁式电流互感器 模块化多电平变流器 高频谐振 |
| DOI：10.19783/j.cnki.pspc.241637 |
| 投稿时间：2024-12-08修订日期：2025-05-11 |
| 基金项目:国家重点研发计划项目资助(2021YFB2601600) |
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| Research on high-frequency resonance mechanism in MMC islanded systems caused by secondary cables of electromagnetic instrument transformers |
| CHENG Peng,REN Qian,SHENG Shiwen,LUO Cheng,SHEN Yuchen |
| (Institute of Energy Power Innovation, North China Electric Power University, Beijing 102206, China) |
| Abstract: |
| With the advancement of the “dual carbon” strategy, China is vigorously developing new energy sources such as wind and solar power. New energy stations located at the edge of the power grid often lack support from AC power sources and rely on MMC-HVDC systems for grid connection. However, the widespread application of power electronic converters has led to high-frequency resonance issues. First, to address the high-frequency resonance problem in new energy stations connected via MMC-HVDC, a mathematical model of the MMC islanded system is established, including the main circuit and control components, as well as electromagnetic voltage/current transformers and their secondary cables. Next, the secondary cables of the electromagnetic voltage/current transformers are modelled using π-type circuits, and their characteristics are analyzed. Then, a stability analysis of the MMC islanded system is conducted, considering the secondary cables of the electromagnetic voltage/current transformers. The mechanism of high-frequency resonance in the islanded system caused by the transmission characteristics of the secondary cables of the electromagnetic voltage/current transformers is clarified. Finally, simulation verification is carried out in PSCAD/EMTDC. Combined with field tests, the accuracy of the proposed high-frequency resonance mechanism in the islanded system caused by the secondary cables of the electromagnetic voltage/current transformers is proved. |
| Key words: electromagnetic voltage transformer electromagnetic current transformer MMC high-frequency resonance |
