江万里,王若愚,李嘉靓,等. 海上风电接入柔直系统的交流故障机理及影响分析[J]. 南方能源建设,2025,12(1):91-99.. DOI: 10.16516/j.ceec.2023-268
引用本文: 江万里,王若愚,李嘉靓,等. 海上风电接入柔直系统的交流故障机理及影响分析[J]. 南方能源建设,2025,12(1):91-99.. DOI: 10.16516/j.ceec.2023-268
JIANG Wanli, WANG Ruoyu, LI Jiajing, et al. AC fault mechanism and impact analysis of offshore wind power connected to flexible and direct systems [J]. Southern energy construction, 2025, 12(1): 91-99. DOI: 10.16516/j.ceec.2023-268
Citation: JIANG Wanli, WANG Ruoyu, LI Jiajing, et al. AC fault mechanism and impact analysis of offshore wind power connected to flexible and direct systems [J]. Southern energy construction, 2025, 12(1): 91-99. DOI: 10.16516/j.ceec.2023-268

海上风电接入柔直系统的交流故障机理及影响分析

AC Fault Mechanism and Impact Analysis of Offshore Wind Power Connected to Flexible and Direct Systems

  • 摘要:
    目的 为了更好地掌握海上风电接入系统故障特性,进行了海上风电接入系统交流故障特征的影响分析。
    方法 给出了海上风电并网输电系统拓扑分析和海上风电电气结构工作控制原理分析,其中包括PMSG工作控制原理分析,柔直输电系统的拓扑及原理分析,海上换流站工作控制原理分析,陆上换流站工作控制原理分析,从不对称故障与对称故障2个方面开展了海上风电接入系统的故障特征机理分析。
    结果 建立了基于PSCAD的海上风电经柔直送出的仿真模型并进行了验证分析,通过单相接地故障和三相接地故障仿真分析对所提出机理分析的正确性和普遍适用性进行了验证。
    结论 仿真结果验证了故障特征机理分析的正确性,对称分量法能够满足于在含电力电子设备接入系统下的故障分析,不对称故障时,两侧的同相短路电流有一定的相角差,柔直侧的负序电流最大,风场侧的短路电流整体较小,对称故障时,柔直侧、风场侧电流分量中仅有正序电流,两侧的同相短路电流的相位几乎趋于一致,均呈现幅值受限特征。

     

    Abstract:
    Objective In order to better understand the fault characteristics of offshore wind power access system, the impact analysis of AC fault characteristics of offshore wind power access system is carried out.
    Method The topology analysis of grid-connected transmission system of offshore wind power and the work control principle analysis of offshore wind power electrical structure were presented, including the work control principle analysis of PMSG, the topology and principle analysis of flexible and direct transmission system, the work control principle analysis of offshore converter station, the work control principle analysis of onshore converter station, and the work control principle analysis of offshore converter station. The fault characteristics and mechanism of offshore wind power access system were analyzed from two aspects: asymmetric fault and symmetric fault.
    Result The simulation model of PSCAD-based offshore wind power transmission through flexible direct transmission is established and verified. The correctness and universal applicability of the proposed mechanism analysis are verified through the simulation analysis of single-phase grounding fault and three-phase grounding fault.
    Conclusion The simulation results verify the correctness of the fault characteristic mechanism analysis. The symmetric component method can be satisfied with the fault analysis in the system with power electronic equipment access. In the case of asymmetric fault, the in-phase short-circuit current on both sides has a certain phase Angle difference, the negative sequence current on the soft straight side is the largest, and the short-circuit current on the wind side is generally small. There is only positive sequence current in the soft direct side and wind field side, and the phase of in-phase short-circuit current on both sides is almost the same, showing amplitude limitation.

     

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