| 王旭,孟克其劳,张占强,宋丽丽,贾大江,宋为民.基于FFT和HHT的Kaiser窗校正的风力发电机组电压闪变测量[J].电子测量与仪器学报,2017,31(5):802-808 |
| 基于FFT和HHT的Kaiser窗校正的风力发电机组电压闪变测量 |
| Voltage flicker measurement of wind turbines using Kaiser window correction based on FFT and HHT |
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| DOI：10.13382/j.jemi.2017.05.021 |
| 中文关键词: 风力发电机组 电压闪变 快速傅里叶变换 Kaiser窗 希尔伯特黄变换 |
| 英文关键词:wind turbines voltage flicker FFT transform Kaiser window Hilbert Huang transform |
| 基金项目:国家自然科学基金（51467016）、内蒙古科技计划（20130303）、内蒙古科技创新引导奖励资金资助项目 |
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| Author | Institution |
| Wang Xu | College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010080, China |
| Mengke Qilao | College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010080, China |
| Zhang Zhanqiang | College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010080, China |
| Song Lili | College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010080, China |
| Jia Dajiang | Shanghai Wind Power Stock Co. Ltd., Shanghai 200437, China |
| Song Weimin | Inner Mongolia Autonomous Region Agricultural and Animal Husbandry Machinery Testing Station, Hohhot 010080, China |
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| 中文摘要: |
| 由于电压闪变是非平稳信号，根据IEC闪变仪规范设计的闪变仪，在实际应用中无法直接进行频谱分析。提出了基于快速傅里叶变换（FFT）和希尔伯特黄变换（HHT）的Kaiser窗校正的风力发电机组电压闪变测量方法。分析了Kaiser窗的旁瓣特性和HHT的原理，通过Kaiser窗减少频谱泄露，利用FFT进行滤波，最后用HHT得到闪变包络。仿真实验结果表明，提出的算法可以测量出闪变发生的时间，并能有效克服单频闪变包络频率变化、多频率成分闪变包络频率变化、电网基波频率波动、谐波、间谐波及白噪声对检测结果的影响，其测量结果不仅稳定而且误差较小，还可以得到闪变发生的起止时间。实验进一步证明了该算法的有效性。 |
| 英文摘要: |
| Because voltage flicker is a non stationary waveform, the flickermeter designed by the IEC is inefficient to direct spectral analysis when implementing a flickermeter in the real word. To overcome this difficulty, the voltage flicker measurement of wind turbines algorithm using Kaiser window correction based on FFT and HHT is proposed and established. Sidelobe characteristics of Kaiser window and the principle of Hilbert Huang transform are analyzed in this paper. In order to decrease the spectrum leakage and eliminate the high frequency, the envelope parameters of voltage flicker waveform are extracted by the Hilbert Huang transform based on Kaiser window and FFT. The simulation results show that the occurrence time of flicker is obtained and the influence of voltage flicker evaluation which are caused by the frequency of voltage flicker waveform, multi frequency of voltage flicker waveform, the fundamental grid frequency fluctuations, harmonics, inter harmonics and white noise are all restrained by using the proposed methodology. This methodology can obtain precise and steady outcome and occurrence time of flicker. The experimental results show that the proposed strategy is efficient. |
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