| 引用本文: | 杨 帆,杨志淳,陈鹤冲,等.基于低频扰动的多分布式电源孤岛检测方法[J].电力系统保护与控制,2024,52(16):132-140.[点击复制] |
| YANG Fan,YANG Zhichun,CHEN Hechong,et al.Islanding detection method for multiple distributed power sources based on low-frequency disturbances[J].Power System Protection and Control,2024,52(16):132-140[点击复制] |
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| 摘要: |
| 针对被动法检测盲区较大和主动法易产生稀释效应的问题，提出基于主、被动结合的多分布式电源(distributed generation, DG)孤岛检测方法。首先，该方法利用有源电力滤波器(active power filter, APF)实现无功功率扰动，即通过扰动APF的q轴参数来控制其输出频率为2 Hz的无功功率，以扰动孤岛频率周期性波动。然后，利用小波分解和小波重构算法提取频率信号中的低频分量。最后，利用快速傅里叶变换(fast fourier transform, FFT)算法计算2 Hz低频分量的幅值并判断是否越限，以实现多DG孤岛检测。Matlab/Simulink建模仿真结果表明：该方法能够有效地避免稀释效应，实现多DG孤岛检测。 |
| 关键词: 有源配电网 多分布式电源 孤岛检测 小波分解与重构 主、被动结合 |
| DOI：10.19783/j.cnki.pspc.231514 |
| 投稿时间：2023-11-29修订日期：2024-03-26 |
| 基金项目:国家电网有限公司总部科技项目资助(5400- 202322206A-1-1-ZN) |
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| Islanding detection method for multiple distributed power sources based on low-frequency disturbances |
| YANG Fan1,YANG Zhichun1,CHEN Hechong1,LEI Yang1,XU Bingyin2,ZHANG Xinhui2 |
| (1. Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China;
2. Shandong Kehui Power Automation Co., Ltd., Jinan 250101, China) |
| Abstract: |
| There are problems of large blind spots in passive detection and dilution effects in active detection. Thus this paper proposes a multi-distributed generation (DG) islanding detection method based on active/passive combination. First, this method uses an active power filter (APF) to achieve reactive power disturbance. This controls the reactive power output frequency of 2 Hz by perturbing the q-axis parameters of the APF, in order to perturb the periodic fluctuations of islanding frequency. Then, wavelet decomposition and wavelet reconstruction algorithms are used to extract low-frequency components from frequency signals. Finally, the fast Fourier transform (FFT) algorithm is used to calculate the amplitude of the 2 Hz low-frequency component and determine whether it is out of limit, to achieve multi-DG island detection. The modeling and simulation results using Matlab/Simulink show that this method can effectively avoid dilution effects and achieve multi-DG island detection. |
| Key words: active distribution network multiple distributed generators islanding detection wavelet decomposition and reconstruction active/passive combination |
