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Experimental Study on Dual parameter WeiBull Failure Model of Oil-Paper Insulation in Converter Transformers Considering the Influence of Harmonic Voltage

Experimental Study on Dual parameter WeiBull Failure Model o...

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International Conference on High Voltage Engineering and Application, ICHVE

作者： Ning Zhang Jian Hao Jing Xu Jixiang Wang Houhe Chen Ruijin Liao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

The main causes of harmonic distortion in new power systems are high percentage renewable energy grid connections and high percentage power electronic equipment access. These factors pose a serious threat to the ultra-high voltage converter transformers’ ability to perform as oil-paper insulation, and little research has been done on the failure law of oil-paper insulation that takes the effects of harmonic voltage into account. This paper presents the design and construction of a typical oil-paper insulation structure breakdown test platform, as well as the oil-paper insulation breakdown voltage under various frequency and content of harmonic voltage superimposed on the fundamental voltage. The dual parameter WeiBull distribution model is used to investigate the oil-paper insulation failure law under the influence of various harmonic voltage components. The experimental results show that the breakdown voltage of oil-paper insulation significantly decreases relative to the breakdown voltage of power frequency under the action of harmonic voltages with different frequencies and contents, and all follow a dual parameter WeiBull probability distribution. Among them, the minimum $\boldsymbol{U}_{63.2 \%}$ is about 13.47 kV when the 7 th and 11th harmonic voltage are superimposed, and the minimum $U_{63.2 \%}$ is about 13 kV when the 5th and 13th harmonic voltage are superimposed, which is about $\mathbf{2 3 \%}$ lower than the power frequency. Secondly, the fitting distribution of test data under the action of harmonic voltage of different frequencies and contents is approximately parallel, indicating that the failure mechanism of oil-paper insulation is the same.

关键词： Breakdown voltage renewable energy sources power system harmonics Oil insulation Harmonic analysis Probability distribution power electronics

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Research on a New Integrated Device for Remote control of power Cable Testing and Cutting

Research on a New Integrated Device for Remote Control of Po...

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2024 Boao New power system International Forum - power system and New energy technology Innovation Forum, NPSIF 2024

作者： Cao, Kangyangyong Xing, Hongquan Zhang, Yilin Xue, Chuan Li, Feiyi Gao, Ziyang State Grid Changchun Power Supply Company Changdian Group Cable Engineering Branch Jilin Changchun130000 China State Grid Changchun Power Supply Company Operation Maintenance Department Jilin Changchun130000 China Northeast Electric Power University Engineering Training and Teaching Center Jilin Jilin132011 China Jilin Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132011 China

ISBN: (纸本)9798331504557

With the continuous improvement and development of urban power grid structures, it is inevitable that cable lines will need to be renovated and replaced. In the process of cable construction, the traditional cable cutting process involves independent operations, requiring a large amount of equipment and occupying a large area. Workers need to wear protective clothing when cutting, which is inflexible and inefficient. This approach is no longer adequate for the diverse and complex construction sites of today. To this end, a new type of integrated power cable cutting device is specially designed and developed, which combines testing and cutting, reducing the use of cable cutting tools. The newly developed circuit cutter is designed with features such as compact size, high structural strength, good cutting effect, strong adaptability, and remote control function. It can significantly improve the safety and convenience of cable cutting operations, which is of positive significance for improving construction quality and efficiency and ensuring the personal safety of operators. © 2024 IEEE.

关键词： Remote control

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Visual simulation Platform for Optimization Configuration and Coordinated control of Thermal-Storage Joint Frequency Regulation

Visual Simulation Platform for Optimization Configuration an...

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IEEE Conference on energy Internet and energy system Integration (EI2)

作者： Cuiping Li Ziyun Zong Zheng Fang Zhijun Li Ping Zhang Qinglin Sui Xingxu Zhu Junhui Li Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University China Huadian Electric Power Research Institute Co. LTD Hangzhou China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

First, analyze the frequency modulation demand situation and propose an optimized configuration method for coordinating the control strategy of a thermal-mixed energy storage system to assist thermal power units in frequency modulation. Then, based on the proposed optimized configuration method and coordination control strategy, develop a visualization simulation platform for the optimized configuration and coordinated control of thermal energy storage joint frequency modulation using Matlab App Designer. Finally, the case study is based on the measured data from a 300 MW thermal power unit in a certain region of China, and it conducts an analysis to verify the effectiveness of the visualization simulation platform.

关键词： Visualization Frequency modulation Data visualization Thermal conductivity Thermal analysis MATLAB Frequency control Optimization Thermal energy energy storage

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A Short-Term power Prediction Method for Wind Farm Cluster Based on Time Dynamic Graph Network and Improved Transformer Model

A Short-Term Power Prediction Method for Wind Farm Cluster B...

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International Russian Smart Industry Conference (SmartIndustryCon)

作者： Chao Han Zihang Chen Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China Jiangmen Power Supply Bureau of Guangdong Power Grid Co. Ltd Jiangmen China

ISBN: (数字)9798331511241

ISBN: (纸本)9798331511258

In recent years, wind power has gradually replaced thermal power as the main source of new energy generation. Wind power prediction in advance can help formulate scheduling strategies and improve the stability of the power system. With the advent of the Industry 4.0 and the widespread application of artificial intelligence technology, artificial algorithms have been extensively used in the field of wind power prediction. To further explore the spatiotemporal correlation of every wind farm in the wind farm cluster, a temporal dynamic graph network is used to divide the wind farm farm into several sub-clusters. Then, the KAN-BiLSTM-Transformer algorithm is used to predict wind power of each wind sub-cluster. Finally, the wind power of each sub-cluster is added to attain the final predicted power of the wind farm cluster. After verification, the RMSE and MAE of the proposed method is 0.06849 and 0.05805 respectively, with an accuracy of 93.15%, which is superior to the compared algorithms. Proposed method can provide more accurate prediction results.

关键词： Accuracy Heuristic algorithms Clustering algorithms Wind power generation Wind farms Predictive models Prediction algorithms Transformers Spatiotemporal phenomena Wind forecasting

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Info-Hkelm Wind power Short-Term Prediction Based on Wind power Low Output Event Identification and Multi-Scenario Error Compensation

SSRN

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SSRN 2023年

作者： Yang, Mao Guo, Yunfeng Huang, Yutong Gu, Dake Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin Province Jilin132012 China

The penetration of a high percentage of renewable energy poses a challenge to the safe and stable operation of the power system, frequent wind power low output events have seriously affected power dispatch and power supply reliability, it becomes necessary to anticipate the occurrence of wind power low output events in advance and to develop effective supply assurance measures. In this paper, we propose a method for identifying and accurately predicting wind power low output events, firstly, we define wind power low output events and identify low output event types based on CNN-BiGRU. Secondly, A weighted clustering comprehensive assessment indicator is proposed to evaluate the effect of clustering of low output events, hybrid kernel extreme learning machine based on weighted mean of vectors algorithm optimization (INFO-HKELM) is used for preliminary prediction of low output events in different scenarios, and a multi-scenario error compensation mechanism based on similar fragment matching is proposed for further correction of power prediction results. The proposed method was applied to a wind farm in Inner Mongolia Autonomous Region for validation. Compared with the rest of the methods, the NRMSE of the method in this paper decreases by 1.56%~1.7%, NMAE decreases by 0.6%~1.11%, and R2 increases by 2.50%~2.92%. The multi-scenario error compensation mechanism reduces the NRMSE and NMAE of the preliminary power prediction results by 1.3% and 1.4%, respectively, which further improves the prediction accuracy and proves the effectiveness of the proposed method in this paper. © 2023, The Authors. All rights reserved.

关键词： Wind power

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A Storage and Transmission Joint Planning Method for Centralized Wind power Transmission

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Computers, Materials & Continua 2021年第7期68卷 1081-1097页

作者： Xiuyu Yang Qi Guo Jianzhong Gui Renyong Chai Xueyuan Liu Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University) Jilin132012China Electrical Engineering-PHD program at the University of Idaho Idaho83843America State Grid Jiangxi Power Supply Company Xinyu338025China

Centralized delivery has become the main operation mode under the scaled development of wind *** channels are usually the guarantee of out-delivered wind power for large-scale wind *** configuration of transmission capacity,which has the features of low utilization and poor economy,is hardly matching correctly due to the volatility and low energy density of *** usage of energy storage can mitigate wind power fluctuations and reduce the requirement of out-delivery transmission capacity,but facing the issue of energy storage cost ***,it is necessary to optimize the allocation of energy storage while considering the problem of wind power *** paper studies the joint optimization of large-scale wind power transmission capacity and energy storage,reveals the mechanism of energy storage in order to reduce the power fluctuation of wind power base and slow down the demand of ***,analyze the multi-functional cost-sharing mode of energy storage,improve the efficiency of energy storage cost *** the coordination optimization configuration model to deal with the problem of large-scale wind power transmission capacity and energy storage,and realizes the transmission capacity optimization coordination and optimization with energy *** proposed method is verified by a wind base located in Northeast China.

关键词： Wind farm group energy storage configuration transmission capacity coordination and optimization

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Thermal power and energy Storage Combined Frequency Modulation Optimization control considering Frequency Modulation Loss Cost and Recovery of State of Charge

Thermal Power and Energy Storage Combined Frequency Modulati...

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power Science and technology (ICPST), IEEE International Conference on

作者： Yeping Yin Liang Zhang Zheng Fang Xiaolong Wang Diyang Wang Ziyun Zong Ping Zhang Junhui Li Huadian Electric Power Research Institute Co. LTD Hangzhou China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

Large-scale new energy grid-connected challenges the frequency modulation of the power grid. How to meet the needs of the system’s frequency modulation while taking into account the economic benefits of thermal power unit wear and energy storage life loss has become an urgent problem to be solved. Therefore, an optimal control strategy of thermal power and energy storage combined with frequency modulation loss cost and Recovery of State of Charge is proposed in this paper. Firstly, the optimal power distribution model of thermal power and energy storage is constructed. Then, taking the minimum frequency modulation loss cost and the minimum SOC offset as the optimization objectives, the remaining frequency modulation capacity and energy storage output constraints of the system were considered comprehensively to complete the frequency modulation power distribution between the thermal power-energy storage combined system. Finally, based on the measured data, the secondary frequency modulation strategy is simulated. The simulation results show that the proposed strategy has good economy, restores the SOC of energy storage, and reduces the frequency modulation loss of the system.

关键词： Frequency modulation Costs simulation power distribution State of charge Resource management Sustainable development

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Analysis of the Impact of Newly Built Grounding Grid on the Original Grounding Grid Based on the Method of Moments

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Procedia Computer Science 2023年 228卷 185-194页

作者： Letian Wang Zhen Liu Mengqing Song Xuan Zheng Chenglian Ma Shandong Electric Power Engineering Consulting Institute Co. Ltd. Jinan China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China

On the basis of the method of moments, the resistive coupling effect between the newly built grounding network. When the horizontal distance between two grounding networks of a substation changes, this original grounding network of a certain substation is analyzed. And establish corresponding soil models based on actual engineering soil resistivity data. Use the grounding grid analysis function of CDEGS software and powerstation software simulation software to simulate and calculate some parameters of the new and old grounding grids. The analysis parameters mainly include the grounding resistance, step voltage, and contact voltage of the grounding grid system. And the obtained parameter indicators are compared and analyzed with safety limits to determine the safety performance of the newly built grounding grid system in the substation. And the impact on the grounding performance of the original grounding network of the substation. Provide certain theoretical data support for the actual promotion of substation grounding network engineering.

关键词： Method of Moment Resistive Coupling Grounding Grid CDEGS powerstation

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Coupling Analysis and Protection Design of Substation Grounding Grid and Surrounding Metal Pipe Grid

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Procedia Computer Science 2023年 228卷 1262-1269页

作者： Tao Wang Haojie Yuan Xuan Zheng Mengqing Song Chenglian Ma Shandong Electric Power Engineering Consulting Institute Co. Ltd. Jinan China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology (Ministry of Education) Northeast Electric Power University Jilin China

When the substation grounding grid and part of the underground metal pipe grid are close to each other, the two produce resistive coupling, and the current of the transmission line will flow through the grounding body and through the soil to the buried pipe grid, which may break through the anti-corrosion layer of the pipe grid, and may burn the body of the pipe grid in serious cases; the underground metal pipe grid will also have an impact on the parameters of the grounding grid. To this end, this paper is based on the numerical calculation method of field-path coupling, combined with the actual situation of substation, using CDEGS and ETAP software to simulate and analyze the current dissipation process when a short-circuit fault occurs in the substation after the ground grid is put into operation under multi-layer soil environment, and to study the influence of resistive coupling between the grounding grid and the surrounding metal pipe grid during an industrial frequency grounding short circuit. Optimize the structure of the grounding system so that the contact voltage across and step voltage is lower than the safety limit to protect the personal safety in the station; at the same time, take certain protective measures to slow down the corrosion of the pipe grid.

关键词： Grounding Grid Metallic Pipe Grid Field Circuit Coupling Ground Potential Rise Resistive Coupling

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Active Support Performance of Grid-connected Multi-power Conversion system Based on Grid-following/Grid-forming control

Active Support Performance of Grid-connected Multi-power Con...

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IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： Tianwei Li Puyu Wang Fuluan Chen Tianming Gu Dejian Yang Gangui Yan Ze Ma Hongsheng Yuan School of Automation Nanjing University of Science and Technology Nanjing China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Northeast Electric Power University China Beijing Mechanical Equipment Institute Beijing China

ISBN: (数字)9798331541606

ISBN: (纸本)9798331541613

The power conversion system (PCS) serves as a crucial intermediary between energy storage system and the power grid. Presently, PCS predominantly employs two control strategies: grid-following (GFL) control and grid-forming (GFM) control. Traditional GFL converters primarily rely on phase-locked loops (PLL) to achieve synchronization with the grid, behaving as controlled current sources, which are incapable of actively supporting grid frequency and voltage. Conversely, GFM converters actively sense disturbance and possess the capability to actively support grid frequency and voltage. However, for multi-PCS grid-connected system, there remains a lack of in-depth investigation into the rational design of the configuration ratio (CR) between two types of converters. This paper investigates multi-PCS grid-connected system based on GFL/GFM control by considering different CRs. Initially, the operational principles and control strategies of multi-PCS grid-connected system are analyzed, elucidating the mathematical models of multi-PCS and their GFL/GFM controllers. Subsequently, a 6-PCSs grid-connected system is employed as an example with seven different CRs simulated in PSCAD/EMTDC, which is disturbed by load disturbance and single-phase ground fault. Finally, the simulation results are compared to obtain the optimal configuration ratio for 6-PCS grid-connected system under corresponding condition.

关键词： Grid following simulation Propulsion Frequency conversion power grids Synchronization Voltage control Phase locked loops Frequency control Grid forming

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