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Semi-supervised surface defect detection of wind turbine blades with YOLOv4 利用 YOLOv4 对风力涡轮机叶片进行半监督表面缺陷检测
IF 1.9 Q4 ENERGY & FUELS Pub Date : 2024-06-01 DOI: 10.1016/j.gloei.2024.06.010
Chao Huang , Minghui Chen , Long Wang

Timely inspection of defects on the surfaces of wind turbine blades can effectively prevent unpredictable accidents. To this end, this study proposes a semi-supervised object-detection network based on You Only Looking Once version 4 (YOLOv4). A semi-supervised structure comprising a generative adversarial network (GAN) was designed to overcome the difficulty in obtaining sufficient samples and sample labeling. In a GAN, the generator is realized by an encoder- decoder network, where the backbone of the encoder is YOLOv4 and the decoder comprises inverse convolutional layers. Partial features from the generator are passed to the defect detection network. Deploying several unlabeled images can significantly improve the generalization and recognition capabilities of defect-detection models. The small-scale object detection capacity of the network can be improved by enhancing essential features in the feature map by adding the concurrent spatial and channel squeeze and excitation (scSE) attention module to the three parts of the YOLOv4 network. A balancing improvement was made to the loss function of YOLOv4 to overcome the imbalance problem of the defective species. The results for both the single- and multi-category defect datasets show that the improved model can make good use of the features of the unlabeled images. The accuracy of wind turbine blade defect detection also has a significant advantage over classical object detection algorithms, including faster R-CNN and DETR.

及时检测风力涡轮机叶片表面的缺陷可有效预防不可预测的事故。为此,本研究提出了一种基于 You Only Looking Once version 4(YOLOv4)的半监督对象检测网络。为了克服获取足够样本和样本标记的困难,本研究设计了一种由生成式对抗网络(GAN)组成的半监督结构。在生成式对抗网络中,生成器由编码器-解码器网络实现,其中编码器的骨干是 YOLOv4,解码器由反卷积层组成。来自生成器的部分特征被传递给缺陷检测网络。部署多张未标记图像可以显著提高缺陷检测模型的泛化和识别能力。通过在 YOLOv4 网络的三个部分中添加并发空间和信道挤压与激励(scSE)注意模块,增强特征图中的基本特征,可以提高网络的小范围物体检测能力。对 YOLOv4 的损失函数进行了平衡改进,以克服缺陷物种的不平衡问题。单类和多类缺陷数据集的结果表明,改进后的模型可以很好地利用未标记图像的特征。风力涡轮机叶片缺陷检测的准确性与传统的物体检测算法(包括速度更快的 R-CNN 和 DETR)相比也具有显著优势。
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引用次数: 0
Prediction and scheduling of multi-energy microgrid based on BiGRU self-attention mechanism and LQPSO 基于 BiGRU 自我关注机制和 LQPSO 的多能源微电网预测与调度
IF 1.9 Q4 ENERGY & FUELS Pub Date : 2024-06-01 DOI: 10.1016/j.gloei.2024.06.007
Yuchen Duan , Peng Li , Jing Xia

To predict renewable energy sources such as solar power in microgrids more accurately, a hybrid power prediction method is presented in this paper. First, the self-attention mechanism is introduced based on a bidirectional gated recurrent neural network (BiGRU) to explore the time-series characteristics of solar power output and consider the influence of different time nodes on the prediction results. Subsequently, an improved quantum particle swarm optimization (QPSO) algorithm is proposed to optimize the hyperparameters of the combined prediction model. The final proposed LQPSO-BiGRU-self-attention hybrid model can predict solar power more effectively. In addition, considering the coordinated utilization of various energy sources such as electricity, hydrogen, and renewable energy, a multi-objective optimization model that considers both economic and environmental costs was constructed. A two-stage adaptive multi- objective quantum particle swarm optimization algorithm aided by a Lévy flight, named MO-LQPSO, was proposed for the comprehensive optimal scheduling of a multi-energy microgrid system. This algorithm effectively balances the global and local search capabilities and enhances the solution of complex nonlinear problems. The effectiveness and superiority of the proposed scheme are verified through comparative simulations.

为了更准确地预测微电网中的太阳能等可再生能源,本文提出了一种混合功率预测方法。首先,基于双向门控递归神经网络(BiGRU)引入自注意机制,探索太阳能输出的时间序列特征,并考虑不同时间节点对预测结果的影响。随后,提出了一种改进的量子粒子群优化算法(QPSO)来优化组合预测模型的超参数。最终提出的 LQPSO-BiGRU-Selfattention 混合模型能更有效地预测太阳能发电量。此外,考虑到电力、氢气和可再生能源等多种能源的协调利用,还构建了一个同时考虑经济和环境成本的多目标优化模型。针对多能源微电网系统的综合优化调度,提出了一种由列维飞行辅助的两阶段自适应多目标量子粒子群优化算法,命名为 MO-LQPSO。该算法有效平衡了全局和局部搜索能力,提高了复杂非线性问题的求解能力。通过比较仿真验证了所提方案的有效性和优越性。
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引用次数: 0
Novel cyber-physical collaborative detection and localization method against dynamic load altering attacks in smart energy grids 针对智能能源网中动态负载改变攻击的新型网络物理协同检测和定位方法
IF 1.9 Q4 ENERGY & FUELS Pub Date : 2024-06-01 DOI: 10.1016/j.gloei.2024.06.003
Xinyu Wang , Xiangjie Wang , Xiaoyuan Luo , Xinping Guan , Shuzheng Wang

Owing to the integration of energy digitization and artificial intelligence technology, smart energy grids can realize the stable, efficient and clean operation of power systems. However, the emergence of cyber-physical attacks, such as dynamic load-altering attacks (DLAAs) has introduced great challenges to the security of smart energy grids. Thus, this study developed a novel cyber-physical collaborative security framework for DLAAs in smart energy grids. The proposed framework integrates attack prediction in the cyber layer with the detection and localization of attacks in the physical layer. First, a data-driven method was proposed to predict the DLAA sequence in the cyber layer. By designing a double radial basis function network, the influence of disturbances on attack prediction can be eliminated. Based on the prediction results, an unknown input observer-based detection and localization method was further developed for the physical layer. In addition, an adaptive threshold was designed to replace the traditional precomputed threshold and improve the detection performance of the DLAAs. Consequently, through the collaborative work of the cyber-physics layer, injected DLAAs were effectively detected and located. Compared with existing methodologies, the simulation results on IEEE 14-bus and 118- bus power systems verified the superiority of the proposed cyber-physical collaborative detection and localization against DLAAs.

由于能源数字化和人工智能技术的融合,智能能源网可以实现电力系统的稳定、高效和清洁运行。然而,动态负载改变攻击(DLAA)等网络物理攻击的出现给智能能源网的安全性带来了巨大挑战。因此,本研究针对智能能源网中的 DLAA 开发了一种新型网络物理协同安全框架。所提出的框架将网络层的攻击预测与物理层的攻击检测和定位整合在一起。首先,提出了一种数据驱动方法来预测网络层的 DLAA 序列。通过设计双径向基函数网络,可以消除干扰对攻击预测的影响。在预测结果的基础上,进一步为物理层开发了基于未知输入观测器的检测和定位方法。此外,还设计了一种自适应阈值,以取代传统的预计算阈值,提高 DLAA 的检测性能。因此,通过网络物理层的协同工作,有效地检测和定位了注入的 DLAA。与现有方法相比,在 IEEE 14 总线和 118 总线电力系统上的仿真结果验证了所提出的网络物理协同检测和定位 DLAAs 的优越性。
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引用次数: 0
Research on high energy efficiency and low bit-width floating-point type data for abnormal object detection of transmission lines 用于输电线路异常对象检测的高能效和低位宽浮点型数据研究
IF 1.9 Q4 ENERGY & FUELS Pub Date : 2024-06-01 DOI: 10.1016/j.gloei.2024.06.009
Chen Wang , Guozheng Peng , Rui Song , Jun Zhang , Li Yan

Achieving a balance between accuracy and efficiency in target detection applications is an important research topic. To detect abnormal targets on power transmission lines at the power edge, this paper proposes an effective method for reducing the data bit width of the network for floating-point quantization. By performing exponent prealignment and mantissa shifting operations, this method avoids the frequent alignment operations of standard floating-point data, thereby further reducing the exponent and mantissa bit width input into the training process. This enables training low-data-bit width models with low hardware-resource consumption while maintaining accuracy. Experimental tests were conducted on a dataset of real-world images of abnormal targets on transmission lines. The results indicate that while maintaining accuracy at a basic level, the proposed method can significantly reduce the data bit width compared with single-precision data. This suggests that the proposed method has a marked ability to enhance the real-time detection of abnormal targets in transmission circuits. Furthermore, a qualitative analysis indicated that the proposed quantization method is particularly suitable for hardware architectures that integrate storage and computation and exhibit good transferability.

在目标检测应用中实现准确性和效率之间的平衡是一个重要的研究课题。为了检测输电线路上功率边缘的异常目标,本文提出了一种有效的方法来减少浮点量化网络的数据位宽。该方法通过执行指数预对齐和尾数移位操作,避免了标准浮点数据的频繁对齐操作,从而进一步降低了输入到训练过程中的指数和尾数位宽。这样就能在保持精度的同时,以较低的硬件资源消耗训练低数据位宽的模型。实验测试在输电线上异常目标的真实世界图像数据集上进行。结果表明,在保持基本精度的同时,与单精度数据相比,所提出的方法可以显著降低数据位宽。这表明,所提出的方法在提高输电线路异常目标的实时检测能力方面具有明显的优势。此外,定性分析表明,所提出的量化方法特别适用于集成了存储和计算的硬件架构,并表现出良好的可移植性。
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引用次数: 0
Synergetic optimization operation method for distribution network based on SOP and PV 基于 SOP 和 PV 的配电网协同优化运行方法
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.002
Lei Chen , Ning Zhang , Xingfang Yang , Wei Pei , Zhenxing Zhao , Yinan Zhu , Hao Xiao

The integration of distributed generation brings in new challenges for the operation of distribution networks, including out-of-limit voltage and power flow control. Soft open points (SOP) are new power electronic devices that can flexibly control active and reactive power flows. With the exception of active power output, photovoltaic (PV) devices can provide reactive power compensation through an inverter. Thus, a synergetic optimization operation method for SOP and PV in a distribution network is proposed. A synergetic optimization model was developed. The voltage deviation, network loss, and ratio of photovoltaic abandonment were selected as the objective functions. The PV model was improved by considering the three reactive power output modes of the PV inverter. Both the load fluctuation and loss of the SOP were considered. Three multi-objective optimization algorithms were used, and a compromise optimal solution was calculated. Case studies were conducted using an IEEE 33-node system. The simulation results indicated that the SOP and PVs complemented each other in terms of active power transmission and reactive power compensation. Synergetic optimization improves power control capability and flexibility, providing better power quality and PV consumption rate.

分布式发电的集成为配电网络的运行带来了新的挑战,包括超限电压和功率流控制。软开路点(SOP)是一种新型电力电子设备,可灵活控制有功和无功功率流。除有功功率输出外,光伏(PV)设备可通过逆变器提供无功功率补偿。因此,本文提出了配电网中 SOP 和光伏的协同优化运行方法。建立了一个协同优化模型。选择电压偏差、网络损耗和光伏弃光率作为目标函数。通过考虑光伏逆变器的三种无功功率输出模式,改进了光伏模型。同时考虑了负载波动和 SOP 损失。使用了三种多目标优化算法,并计算出了折中最优解。使用 IEEE 33 节点系统进行了案例研究。仿真结果表明,SOP 和光伏在有功功率传输和无功功率补偿方面互为补充。协同优化提高了功率控制能力和灵活性,提供了更好的电能质量和光伏消耗率。
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引用次数: 0
Power equipment vibration visualization using intelligent sensing method based on event-sensing principle 利用基于事件传感原理的智能传感方法实现电力设备振动可视化
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.010
Mingzhe Zhao , Xiaojun Shen , Lei Su , Zihang Dong

Vibration measurements can be used to evaluate the operation status of power equipment and are widely applied in equipment quality inspection and fault identification. Event-sensing technology can sense the change in surface light intensity caused by object vibration and provide a visual description of vibration behavior. Based on the analysis of the principle underlying the transformation of vibration behavior into event flow data by an event sensor, this paper proposes an algorithm to reconstruct event flow data into a relationship correlating vibration displacement and time to extract the amplitude-frequency characteristics of the vibration signal. A vibration measurement test platform is constructed, and feasibility and effectiveness tests are performed for the vibration motor and other power equipment. The results show that event-sensing technology can effectively perceive the surface vibration behavior of power and provide a wide dynamic range. Furthermore, the vibration measurement and visualization algorithm for power equipment constructed using this technology offers high measurement accuracy and efficiency. The results of this study provide a new noncontact and visual method for locating vibrations and performing amplitude-frequency analysis on power equipment.

振动测量可用于评估电力设备的运行状态,并广泛应用于设备质量检测和故障识别。事件传感技术可以感知物体振动引起的表面光强变化,并提供振动行为的可视化描述。本文在分析事件传感器将振动行为转化为事件流数据的原理基础上,提出了一种将事件流数据重构为振动位移与时间相关关系的算法,以提取振动信号的幅频特性。构建了振动测量测试平台,并对振动电机和其他动力设备进行了可行性和有效性测试。结果表明,事件传感技术能有效感知动力的表面振动行为,并提供较宽的动态范围。此外,利用该技术构建的电力设备振动测量和可视化算法具有较高的测量精度和效率。这项研究成果为电力设备的振动定位和幅频分析提供了一种新的非接触式可视化方法。
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引用次数: 0
Generalized load graphical forecasting method based on modal decomposition 基于模态分解的通用负荷图形预测方法
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.005
Lizhen Wu , Peixin Chang , Wei Chen , Tingting Pei

In a “low-carbon” context, the power load is affected by the coupling of multiple factors, which gradually evolves from the traditional “pure load” to the generalized load with the dual characteristics of “load + power supply.” Traditional time-series forecasting methods are no longer suitable owing to the complexity and uncertainty associated with generalized loads. From the perspective of image processing, this study proposes a graphical short-term prediction method for generalized loads based on modal decomposition. First, the datasets are normalized and feature-filtered by comparing the results of Xtreme gradient boosting, gradient boosted decision tree, and random forest algorithms. Subsequently, the generalized load data are decomposed into three sets of modalities by modal decomposition, and red, green, and blue (RGB) images are generated using them as the pixel values of the R, G, and B channels. The generated images are diversified, and an optimized DenseNet neural network was used for training and prediction. Finally, the base load, wind power, and photovoltaic power generation data are selected, and the characteristic curves of the generalized load scenarios under different permeabilities of wind power and photovoltaic power generation are obtained using the density-based spatial clustering of applications with noise algorithm. Based on the proposed graphical forecasting method, the feasibility of the generalized load graphical forecasting method is verified by comparing it with the traditional time-series forecasting method.

在 "低碳 "背景下,电力负荷受到多种因素的耦合影响,从传统的 "纯负荷 "逐渐演变为具有 "负荷+电源 "双重特性的广义负荷。由于广义负荷的复杂性和不确定性,传统的时间序列预测方法已不再适用。本研究从图像处理的角度出发,提出了一种基于模态分解的广义负荷图形化短期预测方法。首先,通过比较 Xtreme 梯度提升算法、梯度提升决策树算法和随机森林算法的结果,对数据集进行归一化和特征过滤。然后,通过模态分解将广义负载数据分解为三组模态,并使用它们作为 R、G 和 B 通道的像素值生成红、绿、蓝(RGB)图像。生成的图像是多样化的,并使用优化的 DenseNet 神经网络进行训练和预测。最后,选取基本负荷、风力发电和光伏发电数据,利用基于密度的带噪声应用空间聚类算法,得到风力发电和光伏发电不同渗透率下的广义负荷场景特征曲线。基于所提出的图形预测方法,通过与传统的时间序列预测方法进行比较,验证了广义负荷图形预测方法的可行性。
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引用次数: 0
Carbon efficiency evaluation method for urban energy system with multiple energy complementary 多能互补城市能源系统的碳效率评估方法
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.003
Xianan Jiao , Jiekang Wu , Yunshou Mao , Mengxuan Yan

Urban energy systems (UESs) play a pivotal role in the consumption of clean energy and the promotion of energy cascade utilization. In the context of the construction and operation strategy of UESs with multiple complementary energy resources, a comprehensive assessment of the energy efficiency is of paramount importance. First, a multi-dimensional evaluation system with four primary indexes of energy utilization, environmental protection, system operation, and economic efficiency and 21 secondary indexes is constructed to comprehensively portray the UES. Considering that the evaluation system may contain a large number of indexes and that there is overlapping information among them, an energy efficiency evaluation method based on data processing, dimensionality reduction, integration of combined weights, and gray correlation analysis is proposed. This method can effectively reduce the number of calculations and improve the accuracy of energy efficiency assessments. Third, a demonstration project for a UES in China is presented. The energy efficiency of each scenario is assessed using six operational scenarios. The results show that Scenario 5, in which parks operate independently and investors build shared energy-storage equipment, has the best results and is best suited for green and low-carbon development. The results of the comparative assessment methods show that the proposed method provides a good energy efficiency assessment. This study provides a reference for the optimal planning, construction, and operation of UESs with multiple energy sources.

城市能源系统(UES)在消费清洁能源和促进能源梯级利用方面发挥着举足轻重的作用。在多能互补的城市能源系统建设和运营策略中,对能源效率进行综合评估至关重要。首先,构建了能源利用、环境保护、系统运行、经济效益四个一级指标和 21 个二级指标的多维评价体系,对 UES 进行全面刻画。考虑到评价体系可能包含大量指标,且指标间存在信息重叠,提出了一种基于数据处理、降维、组合权重整合和灰色关联分析的能效评价方法。该方法可有效减少计算量,提高能效评估的准确性。第三,介绍了一个在中国开展的 UES 示范项目。利用六种运行情景对每种情景的能效进行了评估。结果表明,方案 5(园区独立运营,投资者建设共享储能设备)效果最好,最适合绿色低碳发展。比较评估方法的结果表明,建议的方法提供了良好的能效评估。本研究为多能源UES的优化规划、建设和运营提供了参考。
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引用次数: 0
Control method based on DRFNN sliding mode for multifunctional flexible multistate switch 基于 DRFNN 滑动模式的多功能柔性多态开关控制方法
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.007
Jianghua Liao , Wei Gao , Yan Yang , Gengjie Yang

To address the low accuracy and stability when applying classical control theory in distribution networks with distributed generation, a control method involving flexible multistate switches (FMSs) is proposed in this study. This approach is based on an improved double-loop recursive fuzzy neural network (DRFNN) sliding mode, which is intended to stably achieve multiterminal power interaction and adaptive arc suppression for single-phase ground faults. First, an improved DRFNN sliding mode control (SMC) method is proposed to overcome the chattering and transient overshoot inherent in the classical SMC and reduce the reliance on a precise mathematical model of the control system. To improve the robustness of the system, an adaptive parameter-adjustment strategy for the DRFNN is designed, where its dynamic mapping capabilities are leveraged to improve the transient compensation control. Additionally, a quasi-continuous second- order sliding mode controller with a calculus-driven sliding mode surface is developed to improve the current monitoring accuracy and enhance the system stability. The stability of the proposed method and the convergence of the network parameters are verified using the Lyapunov theorem. A simulation model of the three-port FMS with its control system is constructed in MATLAB/Simulink. The simulation result confirms the feasibility and effectiveness of the proposed control strategy based on a comparative analysis.

针对将经典控制理论应用于分布式发电配电网络时精度和稳定性较低的问题,本研究提出了一种涉及柔性多态开关(FMS)的控制方法。该方法基于改进的双环递归模糊神经网络(DRFNN)滑动模式,旨在稳定地实现多终端功率互动和单相接地故障的自适应电弧抑制。首先,提出了一种改进的 DRFNN 滑动模式控制(SMC)方法,以克服经典 SMC 固有的颤振和瞬态过冲问题,并减少对控制系统精确数学模型的依赖。为了提高系统的鲁棒性,设计了 DRFNN 的自适应参数调整策略,利用其动态映射能力来改进瞬态补偿控制。此外,还开发了一种具有微积分驱动滑模曲面的准连续二阶滑模控制器,以提高电流监测精度并增强系统稳定性。利用 Lyapunov 定理验证了所提方法的稳定性和网络参数的收敛性。在 MATLAB/Simulink 中构建了三端口 FMS 及其控制系统的仿真模型。通过比较分析,仿真结果证实了所提控制策略的可行性和有效性。
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引用次数: 0
GRU-integrated constrained soft actor-critic learning enabled fully distributed scheduling strategy for residential virtual power plant 针对住宅虚拟发电厂的 GRU 集成受限软行动者批判学习全分布式调度策略
Q4 ENERGY & FUELS Pub Date : 2024-04-01 DOI: 10.1016/j.gloei.2024.04.001
Xiaoyun Deng , Yongdong Chen , Dongchuan Fan , Youbo Liu , Chao Ma

In this study, a novel residential virtual power plant (RVPP) scheduling method that leverages a gate recurrent unit (GRU)-integrated deep reinforcement learning (DRL) algorithm is proposed. In the proposed scheme, the GRU- integrated DRL algorithm guides the RVPP to participate effectively in both the day-ahead and real-time markets, lowering the electricity purchase costs and consumption risks for end-users. The Lagrangian relaxation technique is introduced to transform the constrained Markov decision process (CMDP) into an unconstrained optimization problem, which guarantees that the constraints are strictly satisfied without determining the penalty coefficients. Furthermore, to enhance the scalability of the constrained soft actor-critic (CSAC)-based RVPP scheduling approach, a fully distributed scheduling architecture was designed to enable plug-and-play in the residential distributed energy resources (RDER). Case studies performed on the constructed RVPP scenario validated the performance of the proposed methodology in enhancing the responsiveness of the RDER to power tariffs, balancing the supply and demand of the power grid, and ensuring customer comfort.

本研究提出了一种利用门递归单元(GRU)集成深度强化学习(DRL)算法的新型住宅虚拟电厂(RVPP)调度方法。在所提出的方案中,GRU 集成 DRL 算法可引导 RVPP 有效参与日前市场和实时市场,从而降低终端用户的购电成本和用电风险。本文引入了拉格朗日松弛技术,将有约束马尔可夫决策过程(CMDP)转化为无约束优化问题,从而在不确定惩罚系数的情况下保证约束条件得到严格满足。此外,为了增强基于约束软行为批判(CSAC)的 RVPP 调度方法的可扩展性,设计了一种全分布式调度架构,以便在住宅分布式能源资源(RDER)中实现即插即用。在构建的 RVPP 情景中进行的案例研究验证了所提方法在提高 RDER 对电价的响应速度、平衡电网供需和确保客户舒适度方面的性能。
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引用次数: 0
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Global Energy Interconnection
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