MMC-HVDC内部谐波模态识别及其稳定性分析

发布时间：2018-06-12 18:14

本文选题：模块化多电平换流器 + 小信号稳定性　；参考：《中国电机工程学报》2017年08期

【摘要】：基于"动态相量"的思想建立对不同环流抑制策略下的模块化多电平换流器(modular multilevel converter,MMC)小信号模型,并通过与时域仿真的对比验证所建小信号模型的精确性。然后对小信号模型进行模态分析,通过计算参与因子将MMC-HVDC系统的模态分为"外部模态"和"内部谐波模态",并表明采用简化MMC端模型无法对内部谐波模态进行分析。另外,对MMC内部谐波模态及其影响因素进行重点详细的分析,分析表明,MMC的内部谐波模态通常呈弱阻尼特性,在系统稳定性分析中不能忽略,换流器的环流抑制策略、等效桥臂电阻、外部主控制器增益等都对内部谐波模态具有较大影响,并揭示MMC的"内部谐波不稳定"现象。最后揭示各因素对MMC内部谐波模态稳定性的影响规律,对工程参数设计和调试具有现实的指导意义。
[Abstract]:Based on the idea of "dynamic phasor", the small signal model of modularized multilevel converters under different circulation-suppression strategies is established, and the accuracy of the proposed model is verified by comparing it with time domain simulation. Then the modal analysis of the small signal model is carried out, and the modes of MMC-HVDC system are divided into "external mode" and "internal harmonic mode" by calculating the participation factors, and it is shown that the simplified MMC end model can not be used to analyze the internal harmonic mode. In addition, the internal harmonic modes of MMC and its influencing factors are analyzed in detail. The analysis shows that the internal harmonic modes of MMC are usually weakly damped, which can not be ignored in the system stability analysis. The equivalent resistance of the bridge arm and the gain of the external main controller have great influence on the internal harmonic modes, and the phenomenon of "internal harmonic instability" of MMC is revealed. Finally, the influence of various factors on the internal harmonic modal stability of MMC is revealed, which is of practical significance to the design and debugging of engineering parameters.
【作者单位】：国网北京经济技术研究院;新能源电力系统国家重点实验室(华北电力大学);曼尼托巴大学;
【分类号】：TM721.1

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