| 引用本文: | 尚若愚,谢欢,刘昕宇,李长宇,谢锣辰,辛焕海.基于等效阻抗优化的跟网型变流器暂态过电压抑制方法[J].电力自动化设备,2025,45(9):128-134,142. |
| SHANG Ruoyu,XIE Huan,LIU Xinyu,LI Changyu,XIE Luochen,XIN Huanhai.Transient overvoltage suppression method of grid-following converter based on equivalent impedance optimization[J].Electric Power Automation Equipment,2025,45(9):128-134,142. |
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| 摘要: |
| 新能源大规模接入电网加剧了交流电网故障恢复阶段的暂态过电压问题。针对电磁暂态时间尺度的暂态过电压问题，建立了跟网型变流器故障恢复期间暂态多过程等效模型。基于所提等效模型，揭示了系统暂态过电压发生机理。进一步地，通过分析内环控制参数对暂态过电压水平的影响规律提出了参数优化方案。在此基础上，由于优化参数可能加剧锁相环与内环的交互，造成小扰动同步失稳，根据二者的交互动态提出了参数优化边界，并结合变流器过流能力形成了基于内环等效阻抗优化的暂态过电压抑制流程。电磁暂态仿真结果表明，所提模型能较为准确地反映暂态过电压机理，所提方法能有效地抑制暂态过电压。 |
| 关键词: 跟网型变流器 内环等效阻抗 小干扰同步失稳 暂态过电压抑制 过流容量 |
| DOI：10.16081/j.epae.202507015 |
| 分类号: |
| 基金项目:国网冀北电力有限公司科技项目(52018K22001M) |
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| Transient overvoltage suppression method of grid-following converter based on equivalent impedance optimization |
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SHANG Ruoyu1, XIE Huan2, LIU Xinyu3, LI Changyu2, XIE Luochen3, XIN Huanhai1,3
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1.Polytechnic Institute, Zhejiang University, Hangzhou 310027, China;2.State Grid Jibei Electric Power Co.,Ltd. Research Institute, Beijing 100045, China;3.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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| Abstract: |
| The large-scale access of renewable energy sources(RESs) to the power grid aggravates the transient overvoltage problem during the fault recovery period. Aiming at the overvoltage during the fault recovery period on electromagnetic transient time scale, an equivalent transient multi-process model of grid-following converter is established. Based on the proposed model, the mechanism of transient overvoltage is revealed. Furthermore, by analyzing the influence of inner loop control parameters on transient overvoltage, a parameter optimization scheme is proposed. On this basis, due to the optimized parameters may aggravate the interaction between the phase-locked loop and the inner loop, resulting in small disturbance synchronous instability, the parameter optimization boundary is proposed according to their interaction dynamics, then a transient overvoltage suppression process is formed based on the optimization of equivalent model considering the overcurrent capability of converter. The electromagnetic transient simulation results show that the proposed model can accurately reflect the transient overvoltage mechanism, and the proposed method can effectively suppress the transient overvoltage. |
| Key words: grid-following converters equivalent impedance of inner loop small disturbance synchronous instability transient overvoltage suppression overcurrent capability |
