共查询到20条相似文献,搜索用时 62 毫秒
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风电场功率预测现有模型一般采用基于批量训练方式的单隐层BP神经网络,针对该模型易陷入局部极小及预测精度较低等缺点,结合风电场功率预测数据量大及不确定性大的特点,建立一种基于增量处理方式的双隐层BP神经网络模型,具有预测精度高、较好跟踪功率波动、运算速度快、不易陷入局部极小等优点;目前预测模型一般使用线性归一化方法对神经网络输入输出参数进行处理,基于风电场功率数据取值分布不均匀的特点,提出一种新的非线性归一化方法,实例证明,该方法可有效提高预测精度,尤其是较高功率值和较低功率值预测效果更佳。 相似文献
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为提高短期风功率预测精度和预测的可控性,提出一种基于能量差优化变分模态分解和布谷鸟优化组合神经网络的短期风功率预测模型。采用能量差优化变分模态分解(EVMD)的模态数,将EVMD用于短期风功率分解,基于EVMD分解序列的不同模态特点,对非线性序列采用布谷鸟优化反向传播神经网络(CS-BPNN),对平稳序列采用自回归滑动平均模型(ARMA),并重构加权得到点预测值,并基于EVMD分解所丢失的序列信息构建核密度估计,在点预测模型的基础上,进行风功率的区间预测。将所提预测方法用于澳大利亚风电场的实际算例,实验结果表明,该方法可提高短期风功率预测的准确性。 相似文献
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为减小风电场尾流效应的影响,提升风电场整体发电量,提出一种基于偏航尾流模型的风电场功率协同优化方法。首先建立风电场偏航尾流模型,该模型包括用于计算单机组尾流速度分布的Jensen-Gaussian尾流模型、尾流偏转模型及多机组尾流叠加模型,对各机组风轮前来流风速进行求解;再根据来流风速计算风电场输出功率,并以风电场整体输出功率最大为优化目标,利用拟牛顿算法协同优化各机组轴向诱导因子和偏航角度。以4行4列方形布置的16台NREL-5 MW风电机组为对象进行仿真研究。结果表明,所提出的基于偏航尾流模型的风电场功率协同优化方法能显著提升风电场整体输出功率。 相似文献
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为了平抑风电场输出功率波动,考虑到固体氧化物电解池(SOEC)电解水制氢的高效率特性,基于实际数据构建千瓦级SOEC电堆模型并验证了模型精度。针对SOEC系统的非线性和时滞特性,提出一种基于模型预测的功率控制策略,用于平抑风电场输出功率波动。根据某15 MW风电场运行数据,采用集合经验模态分解方法,提出一种风电场输出功率分解方法,获得SOEC系统的充电功率指令并进行仿真验证。结果表明:基于模型预测的SOEC系统功率控制效果很好,可以实现充电功率指令的跟随变化,且平均绝对百分比误差为1.674%,平抑风功率波动效果的准确性较高。 相似文献
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海上风电场运行维护成本高,而其尾流效应影响更加突出,不但会影响风电场的发电效率,还会增大风电场内机组的疲劳载荷,增加运维成本。文章针对基于疲劳均匀的海上风电场主动尾流控制展开研究,通过GH-Bladed软件计算建立了风电机组在典型控制工况下关键零部件的疲劳损伤量数据库。其中的工况包括最大功率追踪、桨距角控制和偏航控制3种,并引用了量子粒子群算法,通过变桨和偏航两种方法进行优化控制,以实现海上风电场发电量提升和风电机组疲劳均匀的多目标主动尾流优化控制策略,降低海上风电场运维成本。仿真结果表明了所提出控制方法的可行性。 相似文献
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Combining demand controlled ventilation (DCV) control and economizer control achieves acceptable and even better indoor air quality with minimum coil energy consumption. The control instability during the transition processes between different control modes are among the major difficulties faced when utilizing economizer control and when combining DCV control with economizer control in applications. A robust control strategy, using “freezing”, gain scheduling, integral term reset and feedback transition control for different transition processes, is developed for addressing these problems. They are evaluated on an air handling unit (AHU) using various simulation tests. The test results demonstrate that the robust control strategy allows stable and robust AHU control. 相似文献
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通过实例介绍了模糊控制以及复合模糊控制在直接转矩控制系统中的应用,并以永磁同步电机的模糊控制为例进行了仿真验证,提出了有待进一步解决的问题和发展前景。 相似文献
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The performance of an incremental Clarke-Gawthrop adaptive control scheme, suitable for a diesel-engine prime mover, is described. The controller uses a predictor that is derived from explicit estimates of the plant deadtime and time constants. Its performance under speed reference changes and load disturbances has been compared to that of a fixed, tuned proportional-integral (PI) controller. The algorithm is found to operate satisfactorily under different values of droop without any additional complexity of computation being incurred. However, the improvement in plant response due to the adaptive algorithm is somewhat reduced at high droops. The effective improvement due to adaptation is also seen to be reduced under `cold oil' conditions. However, even under such conditions, it is possible to obtain improved response as compared to the PI controller 相似文献
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In the last few years, there is a strong trend towards decentralised production and supply, leading to a situation where a growing number of small and medium size producers will be connected to energy networks. But at the same time, the power quality of the generation must be ensured and this means that the electrical parameters of the distribution network have to be maintained within their upper and lower limits. Therefore, new problems related to the management and operation of energy transfer and distribution and to the efficient distribution of renewable energy in the grids are actually arising. Hence, it is reasonable to think that dispersed generation (wind energy generation in this paper) should start to take part in the control of electric variables, and in particular, in reactive power control which is directly related to the voltage level control of distribution networks. This paper presents a control strategy developed for the reactive power regulation of wind farms made up with double fed induction generators, in order to contribute to the voltage regulation of the electrical grid to which farms are connected. 相似文献
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Mahdi Imanian Mahdi Karbasian 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(18):2193-2202
Proper well control is one of the most important challenges during drilling operations in the oil and gas industry. Engineering Process Control is employed to control bit pressure in the present study. As the main innovation in this study, the reference tracking scenario is utilized for the first time to find the extent to which the controllers can track bit pressure by modifying the reference pressure of different formations in the course of the drilling operation. Overall, the model reference adaptive control is shown to perform better in controlling bit pressure according to some features including the process output tracking criteria, control effort, controller tracking error, and cost functions, in comparison to other controllers. 相似文献
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