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Network Embedding Algorithm for Vulnerability Assessment of Power Transmission Lines Using Integrated Structure and Attribute Information

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 351-360页

作者： Xianglong Lian Tong Qian Zepeng Li Xingyu Chen wenhu tang Q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China

In power systems,failures of vulnerable lines can trigger large-scale cascading failures,and vulnerability assessment is dedicated to locating these lines and reducing the risks of such *** on a structure and attribute network embedding(SANE)algorithm,a novel quantitative vulnerability analysis method is proposed to identify vulnerable lines in this ***,a two-layered random walk network with topological and electrical properties of transmission lines is ***,based on the weighted degree of nodes in the two-layered network,the inter-layer and intra-layer walking transition probabilities are developed to obtain walk ***,a Word2Vec algorithm is applied to obtain lowdimension vectors representing transmission lines,according to obtained walk sequences for calculating the vulnerability index of transmissions ***,the proposed method is compared with three widely used methods in two test *** show the network embedding based method is superior to those comparison methods and can provide guidance for identifying vulnerable lines.

关键词： Network embedding random walk transmission lines vulnerability assessment

10 kV电缆中间接头受潮XLPE-SiR绝缘界面放电演化分析

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广东电力 2024年第6期37卷 120-128页

作者：黄成龙赵一枫胡冉刘刚唐文虎华南理工大学电力学院广东广州510641 深圳供电局有限公司广东深圳518000

10 kV电缆中间接头交联聚乙烯硅橡胶(XLPE-SiR)绝缘界面在受潮条件下的放电行为严重影响配电网的可靠性,鉴于对绝缘界面放电行为的发展和特征研究较少,分析在受潮条件下10 kV电缆中间接头XLPE-SiR绝缘界面的放电行为,从仿真和试验2个方... 详细信息

10 kV电缆中间接头交联聚乙烯硅橡胶(XLPE-SiR)绝缘界面在受潮条件下的放电行为严重影响配电网的可靠性,鉴于对绝缘界面放电行为的发展和特征研究较少,分析在受潮条件下10 kV电缆中间接头XLPE-SiR绝缘界面的放电行为,从仿真和试验2个方面验证XLPE-SiR绝缘界面的击穿过程。结果表明:在水分的作用下,XLPE-SiR绝缘界面会出现局部放电,并逐步演变为电弧放电。放电会产生2个影响:一方面引起绝缘材料的热解,形成电痕;另一方面,放电产生的热量导致水蒸发,有效地阻止了绝缘界面处放电的继续。随后,在存在电痕的情况下,进一步研究XLPE-SiR绝缘界面的放电行为。结果表明,当XLPE-SiR绝缘界面存在电痕时,水分的存在会迅速导致绝缘界面击穿。10 kV电缆中间接头绝缘界面受潮直接决定了其绝缘界面放电—短路故障的发展过程,因此在实际电缆中间接头的生产及施工工艺中需要加强防水管控。

关键词：电缆中间接头受潮 XLPE-SiR绝缘界面局部放电绝缘界面击穿

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Multi-parametric Sensitivity Analysis of Improved Transformer Thermal Models Considering Nonlinear Effect of Oil Time Constant

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1950-1958页

作者： Tong Qian Qianlong Wei Zeyuan Yu wenhu tang Qing-Hua Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

This paper aims to develop an approach to investigating the effect of a particular parameter on the output accuracy of transformer thermal models,*** analysis,which can not only reveal the most sensitive parameter of a thermal model but also improve model output *** the first time,the nonlinear time constant(NTC)of transformer oil is proposed to reshape three practical top-oil temperature models based on an expression of nonlinear thermal conductance:the modified IEEE clause 7 model,Swift’s model,and Susa’s ***,the multi-parametric sensitivity analysis(MPSA)is undertaken to reveal the effect of each parameter on the model output *** onsite data validation,the results show that the accuracy performance of the proposed NTC thermal models are improved significantly by considering the nonlinear effect of oil time ***,the derived sensitivity performances can clearly reveal the most dominant parameter of the model,so as to simplify the model parameter identification process by reducing the number of insensitive ***,the heat-run test data is used as a reference to validate parameters optimized through a genetic algorithm(GA),which demonstrates that the proposed NTC IEEE model has not only one sensitive parameter but also superior accuracy performance.

关键词： Constant genetic algorithm multi-parametric sensitivity analysis nonlinear oil time transformer thermal model

Stability Improvement for One Cycle Controlled Boost Converters Based on Energy Balance Principle

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Chinese Journal of Electronics 2023年第6期32卷 1293-1303页

作者： WANG Lei WU Qinghua MA Wei tang wenhu Guangzhou Maritime University South China University of Technology (SCUT) Chongqing University of Science and Technology

Boost converters with one cycle control(OCC) are prone to exhibit oscillations as the Hopf bifurcation, which may degrade performances and limit the parameter stable region of converters. This work proposed a novel control strategy for suppressing such bifurcations and enlarging the parameter stability region of the boost system on the basis of the principle of energy balance in the circuit. Through analyzing of the stability and bifurcation condition, the results reflect that, the energybased OCC can adjust the poles of the system transfer function, which ensures the stable operation of the system in an extended range of circuit parameters. Moreover,the orders of the transfer function will not be increased by such adjustments, thus the computational complexity of the transfer function will be increased. The theoretical analysis demonstrates the ability of the energy-based OCC for suppressing the bifurcations and enlarging the stable region of the system parameters. The results by simulation and experiment further prove the effectiveness of the proposed control strategy.

关键词： Transfer functions Bifurcation Stability analysis Circuit stability Computational complexity Oscillators

Residue Theorem based soft sliding mode control for wind power generation systems

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Protection and Control of Modern Power Systems 2018年第1期3卷 256-267页

作者： Mohammed Alsumiri Liuying Li Lin Jiang wenhu tang University of Liverpool LiverpoolUK

This paper proposes a residue theorem based soft sliding mode control strategy for a permanent magnet synchronous generator(PMSG)based wind power generation system(WPGS),to achieve the maximum energy conversion and improved in the system dynamic *** main idea is to set a soft dynamic boundary for the controlled variables around a reference *** the controlled variables would lie on a point inside the *** convergence of the operating point is ensured by following the Forward Euler *** proposed control has been verified via simulation and experiments,compared with conventional sliding mode control(SMC)and proportional integral(PI)control.

关键词： Maximum power point tracking Sliding mode control Residue theorem Wind power generation system Permanent magnet synchronous generator

Multi-mapping Fault Diagnosis of High Voltage Circuit Breaker Based on Mathematical Morphology and Wavelet Entropy

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CSEE Journal of Power and Energy Systems 2019年第1期5卷 130-138页

作者： Tianyao Ji Lin Yi wenhu tang Mengjie Shi Q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

Mechanical faults of high voltage circuit breakers(CBs)seriously affect the reliability of their operation,which may cause severe damage to power *** order to monitor operational conditions and detect mechanical faults of CBs,a multi-parameter monitoring system is designed and a fault diagnosis method based on multi-mapping is *** paper focuses on the trip/close circuits,the spring-charging mechanism and the transmission mechanism,and obtains four current signals and a vibration signal that can reflect CB *** the current signals,a morphological filter is used to remove noise and then characteristics of the waveforms’shape information are *** vibration signals,the wavelet packet transform is used to decompose the signal into various frequency bands,and the sample entropy of the low frequency bands and the wavelet energy of the high frequency bands are calculated,*** on these feature parameters,a multi-mapping strategy is proposed for CB fault *** experiments have been conducted to obtain on-site signals under various conditions,and experiment results have verified that monitoring the aforementioned signals and using the corresponding feature extraction and fault diagnosis methods,the mechanical faults of high voltage CBs can be effectively diagnosed.

关键词： Fault diagnosis high voltage circuit breaker multi-mapping sample entropy wavelet energy

Kernel-based Consensus Clustering for Ontology-embedded Document Repository of Power Substations

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CSEE Journal of Power and Energy Systems 2017年第2期3卷 212-221页

作者： Long Yan wenhu tang Q.H.Wu Jeremy Simon Smith Department of Electrical Engineering and Electronic The University of LiverpoolLiverpoolL693GJU.K. School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

This paper presents a novel consensus clustering(CC)approach for a document repository concerning power substations(PSD)and contributes to the intangible asset management of power systems.A domain ontology model,i.e.,substation ontology(SONT),is applied to modify the traditional vector space model(VSM)for document representation,which is concerned with the semantic relationship between terms.A new document representation is generated using a term mutual information matrix with the aid of *** addition,compared with two other novel CC algorithms,i.e.,non-negative matrix factorisation-based CC(NNMF-CC)and information theory-based CC(INT-CC),weighted partition via kernel-based CC algorithm(WPK-CC)is utilised to solve the CC issue for ***,genetic algorithms(GA)were applied to WPK-CC for PSD,as there are limitations in the original WPK-CC for document ***,selected mechanisms in each GA’s procedure are compared and improved,resulting in comprehensive parameter settings for the PSD *** simulation studies have been designed,in which the results are evaluated by purity validation method and show that the SONT-based document representation and improved WPK-CC,via modified GA,significantly improve the performance of the PSD CC.

关键词： power system asset management document clustering consensus clustering ontology kernel method GA

考虑配电网络重构和楼宇群主动需求响应的集成楼宇群配电网优化控制

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中国电机工程学报 2023年第8期43卷 2966-2978页

作者：唐文虎张银钱瞳华南理工大学电力学院广东省广州市510640

为分析并抑制电力变压器热稳定安全约束对集成楼宇群配电网中灵活性资源调度的不利影响,该文构建了考虑油浸式变压器热稳定安全约束的集成楼宇群配电网新框架。该框架首先通过配电网络顺序重构和配电网络随机重构优化楼宇群主动需求响... 详细信息

为分析并抑制电力变压器热稳定安全约束对集成楼宇群配电网中灵活性资源调度的不利影响,该文构建了考虑油浸式变压器热稳定安全约束的集成楼宇群配电网新框架。该框架首先通过配电网络顺序重构和配电网络随机重构优化楼宇群主动需求响应、光伏发电和电池储能系统的调度控制,然后校验油浸式变压器的油温和相对寿命损失是否满足其热稳定安全约束,并根据校验结果调整油浸式变压器的最大允许负载率。对改进的IEEE 69节点系统的仿真结果表明,构建的框架能够通过充分利用光伏发电、电池储能系统的充放电和楼宇群的主动需求响应,有效兼顾维护变压器的热稳定、满足楼宇用户的热舒适需求、稳定配电网的节点电压和提高配电网节能水平。

关键词：集成楼宇群配电网油浸式变压器主动需求响应楼宇群配电网络重构

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基于动态调节下垂曲线的光伏逆变器两阶段协调控制策略

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广东电力 2024年第2期37卷 33-46页

作者：王键钱瞳唐文虎吴承虎陈嘉伟申悦晴龚贤夫华南理工大学电力学院广东广州510641 广东电网有限责任公司电网规划研究中心广东广州510080

在分布式光伏高渗透的有源配电网中,常规集中、局部电压控制已无法经济有效地解决电压越限、波动问题。为此提出光伏逆变器集中-局部电压两阶段控制策略,局部控制曲线采用多曲线节点灵活可调的改进无功-电压(Q-V)下垂曲线。集中控制阶... 详细信息

在分布式光伏高渗透的有源配电网中,常规集中、局部电压控制已无法经济有效地解决电压越限、波动问题。为此提出光伏逆变器集中-局部电压两阶段控制策略,局部控制曲线采用多曲线节点灵活可调的改进无功-电压(Q-V)下垂曲线。集中控制阶段以电压控制成本与电压越限条件风险价值的加权和最小为目标函数,利用分布鲁棒优化算法和模型预测控制算法考虑光伏出力预测不确定性,对各光伏逆变器的有功功率削减量参考值和Q-V下垂曲线进行分钟级全局优化设置和调节;局部控制阶段根据Q-V下垂曲线和实时测量的节点电压,动态调整光伏逆变器无功出力。采用改进的IEEE 37节点配电系统进行仿真,结果表明:所提控制策略不仅能够集中、最优地协调各光伏逆变器的有功功率削减量和无功出力,避免电压越限,还能在局部控制阶段利用集中优化后的Q-V下垂曲线使电压波动降低40.56%,满足配电网运营商对电压控制经济性和鲁棒性的不同需求。

关键词：主动配电网电压越限高渗透光伏分布鲁棒优化不确定性电压-无功下垂曲线

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