论文中文题名: | 基于误差补偿的回声状态网络结构优化研究 |
姓名: | |
学号: | 22208223100 |
保密级别: | 公开 |
论文语种: | chi |
学科代码: | 085400 |
学科名称: | 工学 - 电子信息 |
学生类型: | 硕士 |
学位级别: | 工程硕士 |
学位年度: | 2025 |
培养单位: | 西安科技大学 |
院系: | |
专业: | |
研究方向: | 智能信息处理 |
第一导师姓名: | |
第一导师单位: | |
论文提交日期: | 2025-06-17 |
论文答辩日期: | 2025-05-29 |
论文外文题名: | The structure optimization of echo state network based on error compensation |
论文中文关键词: | |
论文外文关键词: | Echo State Network ; Error Compensation ; Structure Optimization ; Nonlinear System Modeling |
论文中文摘要: |
回声状态网络因其具有短期记忆能力和训练过程简单的特点,在预测控制领域得到了广泛的应用。然而,传统回声状态网络受到自身结构的限制,在应对复杂非线性系统时,建模精度和可靠性不足。针对这一问题,提出一种基于误差补偿的回声状态网络结构优化方法。该方法旨在提升回声状态网络在非线性系统中的建模能力,并将其应用于风力发电功率预测。本文的主要内容如下: (1)针对传统回声状态网络在训练过程中忽略误差自相关性,导致非线性系统建模精度低的问题,提出基于迁移学习的误差补偿回声状态网络。该网络模型以处理误差的自相关性为目的,通过理论分析回声状态网络建模过程中误差产生的原因,及误差自相关性对建模精度的影响,进而使用迁移学习机制更新输出权值,实时调整预测误差,以此提高建模的精度与有效性。通过Mackey-Glass、太阳黑子和瓦斯浓度数据集进行实验,结果表明该模型能够根据误差值进行实时补偿,有效降低自相关误差对建模精度的影响,在复杂非线性系统中表现出较高的预测精度与稳定性。与其他网络模型相比,该模型的预测精度提高了约17%。 (2)针对传统回声状态网络易受系统误差带来的不确定性,导致非线性系统建模可靠性不足的问题,提出基于贝叶斯线性回归的误差分布补偿回声状态网络。该网络模型以量化预测的不确定性为目的,通过训练回声状态网络并得到预测误差,进而建立基于贝叶斯线性回归的误差分布补偿模型,采用马尔科夫链蒙特卡洛方法估计误差分布,将其用于预测的不确定性分析,以此提高预测的可靠性。此外,该模型能够利用误差分布,捕捉数据的异常情况并进行补偿。基于基准和真实数据集的实验结果表明,该模型能够根据误差分布进行有效补偿,并在95%的置信区间内尽可能覆盖更多真实值,从而显著提升预测的可靠性。 (3)针对风电功率数据具有较强的不确定性,难以实现高精度且可靠的预测,构建基于误差补偿的风力发电功率预测模型。结合数据的相关性分析与异常处理结果,发现风速与风电功率之间存在显著相关性。在此基础上,使用风电功率预测模型对风电场实际数据建模,该模型能够提供准确且可靠的风电功率预测结果,为提升能源管理应用的效能提供了理论支撑与决策依据。 |
论文外文摘要: |
Echo state networks have been widely used in predictive control due to their short-term memory capability and simple training process. However, the traditional echo state network is limited by its structure, and its modeling accuracy and reliability are insufficient when coping with complex nonlinear systems. To address this problem, a structural optimization method for an echo state network based on error compensation is proposed. The method aims to improve the modeling capability of echo state networks in nonlinear systems and apply it to wind power prediction. The main content of this paper is as follows: (1) Aiming at the problem that the traditional echo state network ignores the error autocorrelation during the training process, which leads to the low modeling accuracy of nonlinear systems, a transfer learning-based echo state network is proposed. The network model aims to deal with the autocorrelation of errors, through theoretical analysis of the causes of errors in the modeling process of echo state network, and the impact of error autocorrelation on modeling accuracy, and then use the transfer learning method to update the output weights and adjust the prediction errors in real-time, to improve the accuracy and effectiveness of modeling. Experiments are conducted with Mackey-Glass, sunspot, and gas concentration datasets, and the results show that the model can compensate in real-time according to prediction error, effectively reduce the impact of autocorrelation error on modeling accuracy, and exhibit high prediction accuracy and stability in complex nonlinear systems. Compared with other network models, the prediction accuracy of the model is improved by 17%. (2) Aiming at the problem that the traditional echo state network is vulnerable to the uncertainty caused by the system error, which leads to the lack of reliability in modeling nonlinear systems, a Bayesian linear regression-based echo state network is proposed. The network model aims to quantify the uncertainty of prediction by training the echo state network and obtaining the prediction error, and then establishing an error distribution compensation model based on Bayesian linear regression, estimating the error distribution by using the Markov chain Monte Carlo method, and using it for the prediction uncertainty analysis, to improve the reliability of prediction. In addition, the model can capture anomalies in the data and compensate for them using the error distribution. Experimental results based on benchmark and real datasets show that the model can compensate effectively based on the error distribution and cover as many real values as possible within a 95% confidence interval, thus significantly improving the reliability of the predictions. (3) Aiming at the uncertainty of wind power data, which makes it difficult to achieve high-precision and reliable prediction, a wind power prediction model based on error compensation is constructed. Combining the correlation analysis of the data with the results of anomaly processing, it is found that there is a significant correlation between wind speed and wind power. On this basis, the wind power prediction model is used to model the actual data of wind farms, and the model can provide accurate and reliable wind power prediction results, which provide theoretical support and a decision-making basis for improving the effectiveness of energy management applications. |
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中图分类号: | TP183 |
开放日期: | 2025-06-18 |