基于离散小波变换的分布式光伏孤岛检测方法Distributed Photovoltaics Islanding Detection Method Based on Discrete Wavelet Transform
顾文,张健华
GU Wen,ZHANG Jianhua
摘要(Abstract):
分布式光伏通过逆变器与低压配电系统相连,要求具有高效的孤岛检测功能。为此,提出了一种基于离散小波变换的新型孤岛检测方法。该方法通过检测分布式光伏逆变器的输出电流和PCC(公共连接点)的采样电压,以离散小波变换方法计算小波系数与小波功率,并通过分析小波功率与PCC频率的变化来判断孤岛现象。在MATLAB/Simulink中建模仿真,并在不同场合下进行测试,结果表明所提出的孤岛检测方法效果良好,并且能有效区分暂态过程和孤岛现象。
Distributed photovoltaics are connected to low-voltage distribution systems through inverters, which require efficient islanding detection. Therefore, this paper proposes a new islanding detection method based on discrete wavelet transform. The method calculates the wavelet coefficient and wavelet power by discrete wavelet transform method by detecting the output current of the distributed photovoltaic inverter and the sampling voltage of the point of common coupling(PCC), and judges the island phenomenon by analyzing the change of wavelet power and frequency. By modeling and simulation in MATLAB/Simulink and test on different occasions, it is proved that the method can detect islanding and effectively distinguish transient faults and islanding phenomena.
关键词(KeyWords):
孤岛检测;分布式光伏;离散小波变换;暂态故障
islanding detection;distributed photovoltaics;discrete wavelet transform;transient fault
基金项目(Foundation): 江苏方天电力技术有限公司科技项目(0FW-17556-DJ)
作者(Author):
顾文,张健华
GU Wen,ZHANG Jianhua
DOI: 10.19585/j.zjdl.201912004
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- 孤岛检测
- 分布式光伏
- 离散小波变换
- 暂态故障
islanding detection - distributed photovoltaics
- discrete wavelet transform
- transient fault