Reliability-Enhanced Hybrid Grounding System Based on Active Neutral-Point Voltage Regulator and Low-Resistance

被引：9

作者：

Liu, Kangli ^{[1
]}

Zhang, Sen ^{[1
]}

Zhao, Jianfeng ^{[1
]}

Zhang, Chi ^{[1
]}

Liu, Biyang ^{[1
]}

机构：

[1] Southeast Univ, Sch Elect Engn, Nanjing 210096, Peoples R China

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2021年 / 36卷 / 05期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Voltage control; Grounding; Resistance; Threshold voltage; Circuit faults; Fault currents; Regulators; Hybrid grounding system; reliability; ground fault; low-resistance; active neutral-point voltage regulator (NVR); SINGLE-PHASE;

D O I：

10.1109/TPWRD.2021.3089055

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

-In urban distribution networks, due to its strong reliability and simple operation, the low-resistance grounding system has gradually replaced the resonance grounding system represented by Petersen coil. However, when a high-resistance ground fault occurs, it is difficult for the low-resistance grounding system to identify the smaller fault characteristics, and the zero-sequence protection device cannot ensure the system reliability. In this letter, a hybrid grounding system (HGS) combining the active neutral-point voltage regulator (NVR) and low-resistance is proposed. By injecting compensation voltage into the neutral point, the fault phase voltage can be reduced below the threshold that can generate a fault arc. Additionally, the proposed coordinated control strategy can effectively switch between the two operation modes (active NVR and low-resistance) according to the actual fault types. Simulation and experimental results verify the rationality and effectiveness of the proposed concept and analysis.

引用

页码：3270 / 3273

页数：4

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