On estimating uncertainty of wind energy with mixture of distributions

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• 作者：Qinghua Hu^a ; Yun Wang^a ; ^{wangyun15@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zongxia Xie^a ; Pengfei Zhu^a ; Daren Yu^b
• 关键词：Wind speed frequency distribution ; Single models ; Mixture models ; Hierarchical mixture of multiple distributions ; Wind energy potential ; Wind energy conversion system
• 刊名：Energy
• 出版年：2016
• 出版时间：1 October 2016
• 年：2016
• 卷：112
• 期：Complete
• 页码：935-962
• 全文大小：8422 K

文摘

Accurate estimation of wind speed frequency distribution will be beneficial to predict accurately wind energy potential and select optimal wind energy conversion systems. Due to the complexity of wind regime, it has been reported that mixture models, constituted by multiple distributions (components), perform better than single models, which are commonly used to model wind speed frequency distribution. The underlying assumption in the existing mixture models is that each component is a unimodal distribution. In this work, we propose a more general model, named hierarchical mixture of multiple distributions. To deal with the bimodal or multimodal case in components, we assume that each component may also be a mixture model. In order to estimate the parameters in the proposed model, a nested expectation maximization algorithm is introduced. The experimental results indicate that, the proposed model outperforms single and mixture models. Moreover, due to the complex expression of the probability density function derived by the proposed model, we also develop a technique to estimate wind energy potential. Accordingly, the performances of different wind energy conversion systems are evaluated via four indicators, which provide comprehensive basis for selecting optimal wind energy conversion system.