结合盲区预评估机制的复合式孤岛检测法

doi:10.16182/j.issn1004731x.joss.201809027

摘要/Abstract

摘要： 孤岛检测方法分为被动式和主动式,前者有较大的检测盲区、成功率低,后者的准确性和可靠性高,却因持续不断地加入扰动量从而降低电网的电能质量。基于此,提出了结合检测盲区预评估机制复合式孤岛检测法。分别采集电网侧流向负载及逆变器侧流向负载的几个电参量进行计算和预评估,根据评估结果选择性地引入Sandia频率偏移法来完成孤岛检测,该方法的盲区很小,在某些负载情况下能实现无盲区检测,且极大地改善了输出电流的电能质量。通过仿真和分析,验证了复合式算法的可行性。

关键词: 光伏发电系统, 并网逆变器, 孤岛检测, 盲区预评估, AFDPF

Abstract: Islanding detection methods are divided into passive and active types. The former has a large detection blind area and low success rate. The latter has high accuracy and reliability, but it reduces the power quality of the grid by continuously adding disturbances. Thus, this paper proposes a compound islanding detection method based on NDZ pre-estimation. Several electrical parameters of the load flow on the grid side and the flow load on the inverter side are separately calculated and pre-evaluated, and Sandia frequency offset method is selectively introduced according to the evaluation result to complete the islanding detection. The NDZ of this method is very small, no blind area detection can be realized under certain load conditions, and the power quality of the output current is greatly improved. Through simulation and analysis, the feasibility of the hybrid algorithm is verified.

Key words: photovoltaic power generation system, grid-connected inverter, islanding detection, NDZ pre-estimation, AFDPF

中图分类号:

龙鑫, 朱自伟, 徐敏. 结合盲区预评估机制的复合式孤岛检测法[J]. 系统仿真学报, 2018, 30(9): 3445-3450.

Long Xin, Zhu Ziwei, Xu Min. A Composite Islanding Detection Method Based on NDZ Pre-estimation Mechanism[J]. Journal of System Simulation, 2018, 30(9): 3445-3450.

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