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SSRN 2024年

作者： Zhang, Yunfei Shen, Jun Li, Jian He, Dawei Chen, Xu Liu, Danyang School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing100084 China Sichuan Energy Internet Research Institute Tsinghua University Chengdu610213 China

Accurate multi-energy load forecasting is the premise of on-demand energy supply, which plays an important role in scenarios of integrated energy system, etc. Although several related studies have been carried out, little attention has been paid to different forecasting demands of various loads, and the accuracy needs to be further improved. Therefore, a new multi-energy load forecasting model based on multiple cross-attention and multi-task learning is proposed in this paper to handle loads with hybrid time granularities, and achieve higher accuracy and more balanced forecasting performance. The proposed model mainly consists of time granularity preprocessing module, Informer expert module and multiple cross-attention module. Comparative experiments are conducted to verify the superiority of the proposed model. Results show that the introduction of multiple cross-attention module can reduce the root mean square errors by 8.08%- 67.05% and the imbalance index by 79.17%. The Informer expert also has better robustness and stability, and the root mean square errors can be reduced by more than 30.09% compared with other experts. In comparison with other mainstream models, the proposed model performs better than the Multi-gate Mixture-of-Experts based models and other single models on multi-energy load forecasting tasks, which verifies the advancement of the proposed model. © 2024, The Authors. All rights reserved.

关键词： Forecasting

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Visualization of CNN Transient Voltage Classification Based on Feature Recognition and Enhancement

Visualization of CNN Transient Voltage Classification Based ...

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Sustainable power and Energy Conference (iSPEC)

作者： Zhendong Li Yutian Liu Jun An Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (纸本)9781665414401

The deep learning algorithm represented by CNN has achieved remarkable results in complex feature extraction, classification and regression. Since the CNN adopts an end-to-end training process, the carrier of acquisition knowledge is a high-dimensional non-linear function, which is hard to understand by humans. Therefore, it is difficult to be widely used in online decision-making engineering scenarios such as the fast assessment of power system transient voltage stability. In this paper, the key input elements extracted by CNN are identified by Grad-CAM, and the key features captured by CNN in the assessment process are enhanced based on AM, so as to finally obtain the visual expression of key areas and variables of the original input data. Besides, a sample construction method based on single line diagram is proposed to improve the visualization effect of Grad-CAM and AM. simulation results and analyses of IEEE 39bus test system demonstrates the effectiveness of the proposed method.

关键词： Training Visualization simulation Data visualization Voltage power system stability Feature extraction

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Stability Evaluation and Frequency Drift Analysis of Sub-Synchronous Oscillation in Grid-Connected PMSG Wind Turbines

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IET Generation, Transmission & Distribution 2025年第1期19卷

作者： Gangui Yan Cheng Yang Yupeng Wang Lin Yue Fu Guo Ministry of Education Key Laboratory of Modern Power System Simulation Control and Green Power Technology Department of Electrical Engineering Northeast Electric Power University Jilin China

The sub-synchronous oscillation (SSO) in grid-connected permanent magnet synchronous generators (PMSG) is a complex dynamic behaviour influenced by multiple factors. The phenomenon of SSO has the characteristic of frequency drift. Previous studies have mainly focused on the SSO stability, without further explanation of the reasons for frequency drift in SSO. In this paper, a SISO transfer function model is constructed to analyse the SSO characteristics of grid-connected PMSG. The study quantitatively analyses the impacts of grid strength, operating conditions and voltage/current control parameters on system stability and oscillation frequency based on amplitude/phase margin. It reveals the triggering mechanism of SSO instability in weak grid strength and characterises the constraining relationship between grid strength/operating conditions and the stable operational region of the system. The results demonstrate that variations in SSO frequency are predominantly influenced by control parameter settings, with a measurable variation range of up to 26.7 Hz. Finally, the effectiveness of the proposed model and the theoretical analysis results are verified through simulations.

关键词： frequency drift power system dynamic stability power system stability stability

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Flame-Made High-Capacity and High Efficient Nanomaterial Wo3-Ceox-Cuo/Tio2 for Mercury Adsorption

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SSRN 2023年

作者： Sen, Shao Li, Guoliang You, Xiaoqing Wang, Shuxiao Key Laboratory for Thermal Science and Power Engineering Ministry of Education Tsinghua University Beijing100084 China Center for Combustion Energy Tsinghua University Beijing100084 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084 China

High-concentration mercury capture at high temperatures is a big challenge for cement clinker production during the periodical shutdown period of raw meal mill. This study synthesized nanomaterials WO3-CeOx-CuO/TiO2 for mercury removal by both wet impregnation and flame synthesis. The performance of the synthesized sorbents is evaluated for mercury removal at 450 °C, which is above the typical temperature at raw meal shutdown conditions. It is found that the adsorption efficiency of the flame-synthesized sorbent remains above 95% after 30 days of absorption, while the sorbent synthesized by wet impregnation gets saturated after 50 hours. To understand the adsorption mechanism, the physicochemical properties of the sorbents including surface area, pore volume and average pore diameter, phase composition, morphology, valence states of surface elements are characterized by N2 adsorption isotherm, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy (XPS) separately. The results show that the flame-synthesized sorbent has a larger specific surface area and smaller primary particle sizes than the sorbent by wet impregnation. In addition, Cu atoms are dispersed in the flame-synthesized sorbent while CuO clusters are supported on CeO2 in the sorbent by wet impregnation. Based on the XPS results, it can be found that the oxidizing species is the adsorbed molecular oxygen from environment for flame-synthesized sorbent but surface active oxygen (Oβ) is consumed for the sorbent synthesized by the impregnation method. © 2023, The Authors. All rights reserved.

关键词： Adsorption

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Unraveling the Role of P Doped Co@C in Diclofenac Degradation

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SSRN 2024年

作者： Huang, Xiaoyi Fang, Shengqiong Yu, Shuili Yang, Junwei You, Qinglun College of Environment Science and Engineering Tongji University Shanghai200092 China College of Environment & Safety Engineering Fuzhou University Fuzhou350116 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants Control Beijing Laboratory for Environmental Frontier Technologies School of Environment Tsinghua University Beijing100084 China Shanghai University of Electric Power China

In order to overcome the low catalytic efficiency of conventional single cobalt-based catalysts, a novel cobalt-based peroxymonosulfate (PMS) heterogeneous catalyst, namely P-Co@C, was synthesized by introducing phosphorus. The degradation rate of diclofenac (DCF) was increased by 5-fold from 0.076 min-1 (Co@C) to 0.426 min-1 (P-Co@C). The enhanced catalytic behavior was ascribed to the increased specific area, promotional hydrophilicity, reduced resistance to electron transfer and improved electron donor of reductive phosphorus. Density functional theory (DFT) calculations suggest that the doped P further facilitates the adsorbability and charge transfer intensity between catalyst and PMS, which benefits the generation of hydroxyl radical, sulfate radical and singlet oxygen. Furthermore, toxicity assessment of the intermediates revealed that the P-Co@C/PMS/DCF system was a diminishing toxicity process, revealing the practicability and eco-friendly of P-Co@C in PMS-based oxidation process. This work provides a new strategy for exploring the cation and anion co-activation of the PMS heterogeneous catalytic systems. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

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Unraveling the Role of P Doped Co@C in Diclofenac Degradation

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SSRN 2024年

关键词： Density functional theory

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A strategy for avoiding overload of AC line after blocking dc line in AC/DC hybrid grid 15

A strategy for avoiding overload of AC line after blocking d...

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15th International Conference on Developments in power system Protection, DPSP 2020

作者： Wang, Hao Kang, Xiaoning Dong, Xinzhou Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an China State Key Laboratory of Control and Simulation Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781713827894

The development of DC transmission technique is prompting the development of AC/DC hybrid grid. As a new form of the grid, AC/DC hybrid grid faces many challenges one of which is the effect of DC blocking on AC lines. This paper analyses the influence of DC blocking on AC lines. Based on the analysis, a control strategy using wide area information is proposed to avoid the severe overload of AC line after blocking a DC line. The proposed strategy increases the transmission power of normally operating DC line aiming to afford part or all of the transmission task of the blocked DC line. The test result obtained from simulation indicates that the proposed strategy can reduce the overload of AC line after blocking a DC line. © 2020 IET Conference Publications.

关键词： Transmissions

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A remote test method for power grid security and stability control system and its engineering application

A remote test method for power grid security and stability c...

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作者： Qi Guo Yihua Zhu Dongxu Chang Shengnan Li Yong Chen Mingkang Wu State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research InstituteChina Southern Power Grid Electric Power Research Institute Ltd.of Yunnan Power Grid Co.

Security and stability control(SSC) system or special protection system(SPS) is an important means to ensure the safe operation of power grid. In view of the insufficiency that the current open-loop testing method cannot fully test the SSC system on-site, a remote real-time closed-loop test method is proposed. The solutions of key techniques such as information interaction, remote communication and signal conversion in remote test system are studied. Then the platform architecture and standard interface of the remote test system are designed. A remote test platform for SSC system is developed, and there application modes of the platform is deeply analysed. Finally, taking SSC system of Yunnan AC power outgoing grid as pilot application, experiment of two substations on-site is carried out. The results in practical project further prove the effectiveness of the method presented in this paper.

关键词： Security and stability control system Real-time simulation power communication network Remote closed loop test

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Robust sliding model predictive control with disturbance compensation in application to AUV pitch-axis motion

Robust sliding model predictive control with disturbance com...

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第34届中国控制与决策会议

作者： Jiuwu Hui Jingqi Yuan State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment Department of Automation and the Key Laboratory of System Control and Information Processing/Ministry of EducationShanghai Jiao Tong University

Constraints on the control input and system states as well as uncertain disturbances are the practical challenges in many motion control *** this paper,a disturbance observer(DO) with two-step disturbance compensation algorithm is proposed to deal with disturbances and enhance the robustness of the controller,while a discrete sliding mode predictive control(DSMPC) scheme is designed to handle saturation constraints on the control input and system states with the application to an autonomous underwater vehicle(AUV).The DSMPC combines the model predictive control(MPC) with the discrete sliding mode control(DSMC) using linear matrix inequalities *** stability of the proposed DSMPC are proved via Lyapunov stability ***,simulation results are presented to illustrate the effectiveness of the whole control scheme.

关键词： Disturbance observer Two-step compensation algorithm Discrete sliding mode predictive control Inequality constraints and AUV pitch-axis motion control

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The research of configuration for stability control device in smart substation

The research of configuration for stability control device i...

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作者： Ye He Binjiang Hu Dongxu Chang Jie Zhang Lingfang Li Yixuan Chen Power Planning and Research Center Yunnan Power Grid Co. Ltd. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research InstituteChina Southern Power Grid

A unified specification to design and operate the stability control device in smart substation has not been formed yet, which has greatly affected the promotion and application of stability control device in smart substation. Thus, referring to the technical specifications of protection device and combining to the specificity of stability control device, a full and detailed configuration scheme is proposed to meet the requirement, including the device configuration principle, the access configuration of SV and GOOSE for variable primary connection types,the virtual terminal and soft switch. This solution is beneficial to standardize the R＆D of stability control device in smart substation, and to facilitate on-site debugging, operation and maintenance.

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