共查询到19条相似文献,搜索用时 140 毫秒
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目前,在电力系统短期负荷预测的手段中,已由人工预测方式逐步被软件预测方式所代替.BP人工神经网络是最常用的建立负荷预测模型的工具之一,文章对建立电力负荷BP神经网络预测模型(网络结构)进行了讨论. 相似文献
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负荷的形成受多方面因素的影响,在建立短期负荷预测模型时,需要综合考虑多种因素。同时,负荷是一种时间序列信号,目前的数据能够对以后的数据产生重要的影响,所以文章采用回归BP神经网络模型应用于短期负荷预测。实例计算表明,该方法有效,预测精度比常规方法高,收敛性好,运算速度快。 相似文献
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负荷的形成受多方面因素的影响,在建立短期负荷预测模型时,需要综合考虑多种因素.同时,负荷是一种时间序列信号,目前的数据能够对以后的数据产生重要的影响,所以文章采用回归BP神经网络模型应用于短期负荷预测.实例计算表明,该方法有效,预测精度比常规方法高,收敛性好,运算速度快. 相似文献
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在分析MRO物料特点的基础上,利用BP神经网络算法,对MRO类物料历史需求数量的时间序列数据建立预测模型,解决了MRO类物料由于需求不稳定,影响因子难以确定等带来的需求量预测精度偏低的问题.并通过实证分析说明了BP神经网络在MRO类物料需求量预测上的有效性. 相似文献
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利用BP神经网络构建安徽省物流需求预测模型,在初步确定了预测模型的输入指标和输出指标后,通过灰关联分析,验证了两者之间的强关联性。借助MATLAB7.0软件实现了神经网络预测模型的建立,该模型揭示了输入指标与物流需求量指标之间的非线性映射关系。对训练好的网络进行仿真预测,预测精度较高,说明基于BP神经网络的物流需求预测模型是有效的。 相似文献
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利用BP神经网络构建安徽省物流需求预测模型,在初步确定了预测模型的输入指标和输出指标后,通过灰关联分析,验证了两者之间的强关联性.借助MATLAB7.0软件实现了神经网络预测模型的建立,该模型揭示了输入指标与物流需求量指标之间的非线性映射关系.对训练好的网络进行仿真预测,预测精度较高,说明基于BP神经网络的物流需求预测模型是有效的. 相似文献
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基于灰色神经网络组合模型的废旧产品回收预测 总被引:1,自引:0,他引:1
制造企业对废旧产品进行回收再利用,是节约资源和保护环境的有效方式。由于在产品回收过程中存在诸多不确定性因素,如何对产品回收量进行有效预测是亟待解决的关键问题。本文针对废旧产品回收的特点,将灰色GM(1,1)模型与BP神经网络预测方法结合,构建了灰色神经网络组合预测模型对产品回收量进行预测。该组合模型兼具两种预测方法的优点,预测效果优于各独立模型。案例分析表明了该种预测方法的有效性。 相似文献
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支持向量机是一种基于统计学理论的新颖的机器学习方法,该方法被广泛用于解决分类和回归问题。文章将最小二乘支持向量机(LS—SVM)算法应用于电力系统短期负荷预测中,并将其预测结果和BP神经网络的预测结果进行比较分析。仿真实验表明,该方法在短期负荷预测中具有很好的预测速度和精度。 相似文献
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文章提出基于自组织方法的GMDH(Group Method of Data Halldlin亩型神经网络并将它应用于短期负荷预测。与一般的前馈神经网络不同,GMDH网络的结构确定于训练过程之中,因而可大大提高神经网络性能。它能充分、合理地利用数据,自动进行变量组合,筛选及判断从而得到合适的模型,特别适用于数据预测。将这种用自组织方法所构成的GMDH型神经网络应用于广西某地区电力局的短期负荷预测,采用Matlab6.5进行仿真实验,证明其在短期负荷预测方面有很好的应用前景。 相似文献
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As the internet’s footprint continues to expand, cybersecurity is becoming a major concern for both governments and the private sector. One such cybersecurity issue relates to data integrity attacks. This paper focuses on the power industry, where the forecasting processes rely heavily on the quality of the data. Data integrity attacks are expected to harm the performances of forecasting systems, which will have a major impact on both the financial bottom line of power companies and the resilience of power grids. This paper reveals the effect of data integrity attacks on the accuracy of four representative load forecasting models (multiple linear regression, support vector regression, artificial neural networks, and fuzzy interaction regression). We begin by simulating some data integrity attacks through the random injection of some multipliers that follow a normal or uniform distribution into the load series. Then, the four aforementioned load forecasting models are used to generate one-year-ahead ex post point forecasts in order to provide a comparison of their forecast errors. The results show that the support vector regression model is most robust, followed closely by the multiple linear regression model, while the fuzzy interaction regression model is the least robust of the four. Nevertheless, all four models fail to provide satisfying forecasts when the scale of the data integrity attacks becomes large. This presents a serious challenge to both load forecasters and the broader forecasting community: the generation of accurate forecasts under data integrity attacks. We construct our case study using the publicly-available data from Global Energy Forecasting Competition 2012. At the end, we also offer an overview of potential research topics for future studies. 相似文献
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《International Journal of Forecasting》2019,35(4):1409-1423
This report describes the forecasting model which was developed by team “4C” for the global energy forecasting competition 2017 (GEFCom2017), with some modifications added afterwards to improve its accuracy. The model is based on neural networks. Temperature scenarios obtained from historical data are used as inputs to the neural networks in order to create load scenarios, and these load scenarios are then transformed into quantiles. By using a feature selection approach that is based on a stepwise regression technique, a neural network based model is developed for each zone. Furthermore, a dynamic choice of the temperature scenarios is suggested. The feature selection and dynamic choice of the temperature scenarios can improve the quantile scores considerably, resulting in very accurate forecasts among the top teams. 相似文献