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A Probabilistic Spatial-Temporal Model and Its Application to Wind Prediction

机译:概率的空间 - 时间模型及其对风预测的应用

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Several problems require the combination of temporal and spatial reasoning under uncertainty, such as wind prediction for electricity generation in wind farms. In this work we propose a probabilistic spatial-temporal model (PSTM) focused on prediction problems, based on two common properties of these scenarios: sparsity and multivariable mutual information. The proposed spatial-temporal model is essentially a Bayesian network that represents the dependencies between a target variable of interest and a subset of predictor variables in different times and spaces. We developed an algorithm for learning the structure of the model based on a stochastic search of the optimal subset of predictor variables. The proposed model has been applied for wind prediction at different locations in Mexico, using information from several locations at different times. The PSTM is evaluated in terms of predictive accuracy for different time horizons - 1 to 24 hours; and compared to a dynamic Bayesian network (DBN) developed for wind prediction. The performance of the PSTM is in general competitive, and in most cases superior to the DBN.
机译:几个问题需要在不确定性下的时间和空间推理的组合,例如风电场中发电的风预测。在这项工作中,我们提出了一种概率的空间 - 时间模型(PSTM),其专注于预测问题,基于这些场景的两个共同属性:稀疏性和多变量相互信息。所提出的空间 - 时间模型基本上是贝叶斯网络,其表示利息的目标变量与不同时间和空格中的预测变量的子集之间的依赖性。我们开发了一种用于基于对预测变量的最佳子集的随机搜索学习模型结构的算法。拟议的模型已经在墨西哥的不同位置应用了风预测,使用来自不同时间的几个地点的信息。 PSTM在不同时间范围内的预测精度评估 - 1至24小时;并与动态贝叶斯网络(DBN)相比,用于风预测。 PSTM的性能在普遍竞争中,并且在大多数情况下都优于DBN。

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