基于MMC的配电网电力电子变压器接地设计及故障特性分析

发布时间：2018-06-02 01:33

本文选题：电力电子变压器 + 接地故障　；参考：《电网技术》2017年12期

【摘要】：对基于模块化多电平换流器(modular multilevel converter,MMC)的配电网电力电子变压器在发生交流输入侧单相接地故障、中压直流侧单极接地故障、低压直流侧单极接地故障以及交流输出侧单相接地故障下的故障特性进行了分析。参考MMC-UPFC、MMC-HVDC以及低压交流配电网现有的接地方案,提出适用于配电网电力电子变压器的接地方式:交流输入侧接地变压器接地、交流输入侧大电抗接地、中压直流侧大电阻接地、低压直流侧电容中点接地以及交流输出侧接地变压器接地。对上述接地故障在不同接地方式下的故障特性进行了对比分析,并通过PSCAD仿真平台对所分析接地方式及故障特性进行了仿真验证。最后,基于故障特性分析结果并考虑目前的制造技术,提出了输入侧、输出侧分别采用接地变压器接地作为目前配电网电力电子变压器接地方式的建议。
[Abstract]:The power electronic transformer of distribution network based on modularized multilevel converter (Modular multilevel convertor MMC) has single-phase grounding fault on AC input side and unipolar grounding fault on DC side. The fault characteristics of low voltage DC side single pole grounding fault and ac output single phase earth fault are analyzed. Referring to the existing grounding schemes of MMC-UPFCU MMC-HVDC and low-voltage AC distribution networks, the grounding methods suitable for power electronic transformers in distribution network are put forward: grounding of AC input side earthing transformer, AC input side large reactance grounding, medium voltage DC side large resistance earthing, Low-voltage DC side capacitor neutral grounding and AC output side grounding transformer grounding. The fault characteristics of the above mentioned ground faults under different grounding modes are compared and analyzed, and the analyzed grounding modes and fault characteristics are verified by PSCAD simulation platform. Finally, based on the analysis results of fault characteristics and considering the current manufacturing technology, the paper proposes that grounding transformer should be used in the input side and the output side respectively as the grounding mode of power electronic transformer in the distribution network.
【作者单位】：新能源电力系统国家重点实验室(华北电力大学);
【基金】：北京市自然科学基金资助项目(3172036)~~
【分类号】：TM41

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