Scholarlink

<p>The penetration of distributed generation to the grid and microgrid has been increasing immensely due to the growing electricity demand. However, there is a&#xa0;crucial problem&#xa0;of islanding detection associated with it, a condition when a section of the grid keeps running even after being cut off from the main utility. The accurate and instant detection&#xa0;is generally a matter of concern, as delay or failure of detection can endanger working personnel and threaten grid stability. To address this, the paper introduces a novel technique, the Complex Voltage Unbalance Factor (CVUF), which is the ratio of negative sequence voltage to the positive sequence voltage at the rate of angle. The magnitude of this ratio and the associated angle are both used to detect the islanding instantly. This extra information of angle in CVUF signifies the orientation of unbalance or the direction of unbalance, which is very useful for the diagnosis of faults and system analysis, especially in a rotating machine. The performance of the technique is illustrated utilizing a test system of four Distributed Generation units with three wind farms and one emergency diesel generator connected into a radial distribution network, and thus the obtained results are compared to the existing methods, like Rate of Change of Phase Angle Difference and Rate of Change of Frequency. The suggested technique has also been validated with many standard literature and examined under various scenarios, notably symmetrical and unsymmetrical faults and load shedding.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A novel islanding detection method for microgrid using complex voltage unbalance factor

  • 期刊论文

  • 发表日期：

    2026年5月5日

查看全文
  • Sudheeksha Misra,
  • Bhola Jha,
  • V. M. Mishra

摘要

The penetration of distributed generation to the grid and microgrid has been increasing immensely due to the growing electricity demand. However, there is a crucial problem of islanding detection associated with it, a condition when a section of the grid keeps running even after being cut off from the main utility. The accurate and instant detection is generally a matter of concern, as delay or failure of detection can endanger working personnel and threaten grid stability. To address this, the paper introduces a novel technique, the Complex Voltage Unbalance Factor (CVUF), which is the ratio of negative sequence voltage to the positive sequence voltage at the rate of angle. The magnitude of this ratio and the associated angle are both used to detect the islanding instantly. This extra information of angle in CVUF signifies the orientation of unbalance or the direction of unbalance, which is very useful for the diagnosis of faults and system analysis, especially in a rotating machine. The performance of the technique is illustrated utilizing a test system of four Distributed Generation units with three wind farms and one emergency diesel generator connected into a radial distribution network, and thus the obtained results are compared to the existing methods, like Rate of Change of Phase Angle Difference and Rate of Change of Frequency. The suggested technique has also been validated with many standard literature and examined under various scenarios, notably symmetrical and unsymmetrical faults and load shedding.