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Control, Modeling and Stability Analysis of DRU-based grid-forming Converter

Chinese Journal of Electrical Engineering 2025年第1期11卷 83-92页

作者： Wencong Wu Minzhi Wang Liang Tu Haiqing Cai Guanglei Yan Xiaohui Qu Haohan Gu Wei Chen State Key Laboratory of HVDC China Southern Power GridGuangzhou 510663China National Energy Power Grid Technology R&D Center Guangzhou 510663China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power Systems China Southern Power GridGuangzhou 510663China CSG Key Laboratory for Power System Simulation China Southern Power GridGuangzhou 510663China School of Electrical Engineering Southeast UniversityNanjing 210096China

Diode rectifier unit(DRU)-based high-voltage direct current(HVDC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore *** theuncontrollable characteristicsof DRUs,a grid-forming(GFM)strategy forwind-turbine converters isnecessary to support offshore AC voltageand ***,the active power-synchronization control in traditional GFM converters is unsuitable for DRU-based GFM ***,the stability issue for DRU-based HVDC systems involving DRU-based GFM and grid-following(GFL)converters has not yet been *** solve these issues,this study begins with the characteristics of a DRU-based HVDC system and presents a control scheme for DRU-based GFM converters for power ***,the dq-frame impedance model of the DRU-based GFM converteris proposed for the stability analysis of the entire HVDC ***,a simulation platform is built to verify the model accuracy and system stability.

关键词： Diode rectifier unit offshore wind-powergeneration grid-forming converter impedance model stabilityanalysis

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An equivalent modeling method for integrated water-wind-solar systems based on sparrow search algorithm

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Energy Informatics 2025年第1期8卷 1-16页

作者： Lu, Yuanhong Zhang, Jie Zhang, Jingyue Huang, Libin Guo, Haiping Hu, Binjiang Guo, Tianyu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R & D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

In the context of extensive integration of renewable energy sources into the electrical grid, the grid's fault transient behaviors have undergone significant changes. However, conventional single-unit equivalent models fail to accurately capture the fault transient responses of combined wind-solar-hydro power stations and often require substantial computational resources, leading to reduced simulation efficiency. This study proposes a cluster-based equivalent modeling approach for hybrid wind-solar-hydro power plants using the Sparrow Search Algorithm. key factors influencing fault characteristics, including the distance to the Point of Common Coupling, DC-side current-limiting measures, irradiance levels, water flow rates, wind speeds, and reactive power at the outlet, are identified and used to construct a transient model. Euclidean distances are computed for these factors, and initial clustering centers for wind turbines are determined using an improved max–min distance technique. These factors and clustering centers serve as the training dataset to establish the clustering equivalent model. Simulation results, conducted on the MATLAB2022 platform, demonstrate that the SSA-based model outperforms the single-unit equivalent model by over 150 times in terms of accuracy. Additionally, the SSA-based model achieves a delay time, defined as the time required to compute the system's transient response after a fault, of less than 5 ms, which is less than one-twentieth of the delay time of the single-unit equivalent model. These improvements highlight the model's ability to accurately capture dynamic power responses under various disturbances, making it highly suitable for real-time applications in hybrid renewable energy systems. © The Author(s) 2025.

关键词： MATLAB

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The electromagnetic transient simulation acceleration algorithm based on delay mitigation of dynamic critical paths

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Energy Informatics 2025年第1期8卷 1-12页

作者： Guo, Qi Lu, Yuanhong Zhang, Jie Zhang, Jingyue Huang, Libin Guo, Haiping Guo, Tianyu Tu, Liang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R & D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

The task scheduling problem based on directed acyclic graphs (DAGs) has been proven to be NP-complete in general cases or under certain restrictions. In this paper, building upon existing scheduling algorithms, we introduce a static task scheduling algorithm based on directed acyclic graphs. By incorporating the proportion of task transmission delay as a guiding metric in the optimization process, processors can be prioritized for tasks with high latency, thereby improving computational efficiency. We first validate the theoretical feasibility of the algorithm using a theoretical case study and illustrate the algorithmic effectiveness using two real case studies, direct current (DC) model and alternating current (AC) model respectively. The research indicates that the scheduling algorithm proposed in this paper achieves an average scheduling length improvement of over 1.2% compared to the Heterogeneous Earliest-Finish-Time algorithm (HEFT) in topologies with high latency tasks. Additionally, the experiments show that the HEFT algorithm consumes 39.85us and the EMT-DM algorithm consumes 38.29us during simulation using DC, and the HEFT algorithm consumes 31.23us and the EMT-DM algorithm consumes 26.51us during simulation using AC, both of which are improved compared to the HEFT algorithm. © The Author(s) 2025.

关键词： Flow graphs

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Characteristics of perfluoromethyl vinyl ether:A new eco-friendly alternative gas for SF_(6)

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High Voltage 2024年第3期9卷 509-517页

作者： Song Xiao Yijiang Chen Mingjun Tang Shuangshuang Tian Haoran Xia Yifan Wang Ju Tang Yi Li Xiaoxing Zhang State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and AutomationWuhan UniversityHubeiChina Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System School of Electrical and Electronic EngineeringHubei University of TechnologyWuhanChina

The exploration of eco-friendly insulating gas to substitute the most potent greenhouse gas sulphur hexafluoride(SF6)has consistently garnered significant ***,the au-thors evaluated the feasibility of utilising perfluoromethyl vinyl ether(PMVE,C_(3)F_(6)O)as a new branch of eco-friendly insulating gas for the first *** primary dielectric and stability characteristics of PMVE regarding AC breakdown,partial discharge,dielectric recovery,and decomposition properties were revealed under various gas pressure and electrical field *** was found that PMVE demonstrated superior dielectric strength,with the AC breakdown and PD inception voltage(PDIV)1.10 and 1.14 times that of pure SF_(6).Furthermore,the dielectric strength of PMVE exhibits stability even after undergoing 100 cycles of AC breakdowns,and there is no observable formation of solid precipitation on the electrode *** discharge decomposition of PMVE mainly generates fluorocarbon(CF_(4),C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),etc.)and ***,the exceptional insulation stabilityandno absence of solidprecipitation featuresendow PMVE tobe utilised as a new eco-friendly gas for SF_(6)-free gas-insulated equipment.

关键词： surface dielectric vinyl

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Modeling and Simulation Analysis of Solar Thermal Electric Plants Based on Petri Net

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Energy Engineering 2022年第4期119卷 1711-1728页

作者： Rong Huang Xiaojuan Lu Zeping Liang Pengfei Gao Tian Liang State Grid Gansu Provincial Electric Power Company Electric Power Research Institute Gansu Provincial Key Laboratory of New Energy Grid-Connected Operation ControlLanzhou730070China Lanzhou Jiaotong University Lanzhou730070China

At present,solar thermal power generation is in the demonstration stage,and the large-scale production is affected by many *** view of the characteristics of different operating modes of photothermal power generation,it is analyzed that the turbine needs to be started and stopped frequently due to different operating modes,which will lead to the instability of the output energy and the reduction of power generation *** this paper,the dynamic equation of energy conversion process is established by using the law of conservation of energy and conservation of *** with the logic switching criterion of the system,the system model was established by using the extended differential Petri net,and the validity and accuracy of the model were *** the Petri net model of the system,the system’s working mode switching and power generation situation are analyzed due to the difference of direct normal irradiation intensity(DNI).Finally,the accuracy of the model is proved by comparing it with experimental data of the photovoltaic and thermal demonstration projects that have been connected to the grid.

关键词： Solar power hybrid system petri nets direct molten salt mode switch

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Reactive Power Optimization Control Method for Wind Farms to Actively Participate in grid Voltage Regulation 7th

Reactive Power Optimization Control Method for Wind Farms to...

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7th Purple Mountain Forum on Smart grid Protection and Control, PMF2022

作者： Yang, Lin Liu, Jingbo Su, Jie Wu, Linlin Li, Yan Department of Automation North China Electric Power University Baoding071003 China State Grid Jibei Electric Power Co. Ltd. Research Institute Beijing100045 China Grid-Connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Beijing100045 China

ISBN: (纸本)9789819900626

The traditional method of wind farms following the voltage command of the main station can easily lead to frequent fluctuations of the reactive power source in the station and insufficient reactive power margin in the station, thereby reducing the safety margin of the voltage of the wind farm. To this end, a reactive power coordination and optimal control method for wind farms participating in actively voltage regulation of power grids is proposed. First, based on the wind farm power prediction data and voltage sensitivity, the voltage fluctuation trajectory of the grid connection point is predicted;by coordinating the reactive power output of the fan and SVG, the adjustment frequency of reactive power equipment is effectively reduced. Secondly, the detailed operation scenarios are divided according to the voltage drop amplitude. By adjusting the control mode of SVG, the voltage fluctuation can be quickly suppressed when the voltage fluctuates slightly, and the maximum reactive power regulation capability can be released when the voltage fluctuates greatly, effectively restraining the further deterioration of the voltage. It realizes the actively voltage regulation function under the condition of voltage fluctuation, and ensures the normal operation of the active power of the unit. Finally, the wind farm simulation test model is built based on the RT-LAB platform, which verifies the effect of the proposed method in reducing the frequency of reactive power regulation, improving the reactive power margin and voltage support capability compared with the traditional AVC control strategy. It provides a new solution for realizing actively voltage regulation of wind farms. © state grid Electric Power Research Institute 2023.

关键词： Voltage control

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Research on Suppression Strategy of Power Transformer Excitation Inrush Current Based on Pre-Demagnetization and Quantified Magnetization 11th

Research on Suppression Strategy of Power Transformer Excita...

引用

11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Yuan, Manman Du, Jiabao Yang, Dingqian Li, Shan Xinjiang Key Laboratory of Extreme Environment Operation and Detection Technology of Power Transmission & Transformation Equipment State Grid Xinjiang Electric Power Research Institute Urumqi830011 China

ISBN: (纸本)9789819788279

Due to the hysteresis effect, there will be residual magnetism in the iron core of the transformer after the circuit breaker is opened. When the circuit is closed again, if the closing angle is not appropriate, the residual magnetism will cause the iron core to enter the saturation region, causing excitation inrush current, which poses a threat to the stability of equipment and power grid. In order to effectively address this issue, a reliable method for suppressing excitation inrush current of transformers is needed. Therefore, this paper proposes a method to suppress excitation inrush current of power transformers. This method first demagnetizes the transformer, eliminating the unknown residual magnetic flux inside the transformer to 0. Then, a magnetizing device is used to set the three-phase magnetic flux of the transformer to meet the conditions for phase selection and closing of the transformer, achieving suppression of excitation inrush current. Finally, simulation results show that this method can further reduce excitation inrush current, proving its effectiveness. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Hysteresis

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A method for monitoring and early warning of meteorological disasters in cross regional large power grid based on Doppler radar data

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International Journal of Energy technology and Policy 2025年第1-2期20卷 1-19页

作者： Yang, Yang Li, Meng Wang, Hongxia Zhao, Minguan Ma, Shuyang Xinjiang Power Transmission and Transformation Extreme Environment Operation and Testing Technology Autonomous Region Key Laboratory Urumqi830000 China State Grid Xinjiang Electric Power Co. Ltd. Electric Power Science Research Institute Urumqi830000 China

In order to improve the accuracy of meteorological disaster warning and shorten the monitoring and warning time, a cross regional large power grid meteorological disaster monitoring and warning method based on Doppler radar data is proposed. Firstly, based on the characteristics and requirements of the cross regional large power grid, atmospheric data obtained from Doppler radar is utilised. Secondly, various meteorological disasters based on the characteristics of Doppler radar data for different meteorological disasters are classified and identified. Finally, based on the monitored meteorological disaster results, the level of meteorological disasters in cross regional large power grid, and accurately generate meteorological disaster warning results for cross regional large power grid is analysed. The experimental results show that the proposed method can accurately monitor and warn of meteorological disasters in cross regional large power grid, and effectively shorten the time for monitoring and warning of meteorological disasters. Copyright © 2025 Inderscience Enterprises Ltd.

关键词： Doppler radar

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Theoretical and Field Measurement Analysis of Wind Vibration Response of Lightning Rods 6

Theoretical and Field Measurement Analysis of Wind Vibration...

引用

6th International Conference on HVDC, HVDC 2024

作者： Li, XiaoGuang Lei, ZeYang Zhang, XiaoJun Xinjiang Key Laboratory of Extreme Environment Operation and Detection Technology on Power Transmission & Transformation Equipment State Grid Xinjiang Electric Power Research Institute Urumqi China

ISBN: (纸本)9798350387759

If the inherent frequency of the lightning rod structure itself is close to or the same as the vibration frequency under wind excitation, it will cause resonance, which can affect the normal production and use of the lightning rod. If the resonance is severe, it can also threaten the safety of the structure. There are many cases where lightning rods are damaged under wind loads. To ensure the structural safety of lightning rods in high-voltage substations, a deep exploration of the wind-induced vibration mechanism of lightning rods in high-voltage substations is conducted. Based on existing measured data and theoretical calculations of critical wind speed, the deformation of key parts of lightning rods and the internal forces and stresses of key sections are calculated. The causes of wind-induced vibration of various lightning rods are analyzed, and the working performance of the structure is judged accordingly. This undoubtedly has important theoretical significance and engineering application value. © 2024 IEEE.

关键词： field measurements lightning rods vortexexcited vibration wind speed locking zone wind-induced vibration

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Fault Diagnosis of UHVDC Transmission System Based on Gated Recurrent Unit

Fault Diagnosis of UHVDC Transmission System Based on Gated ...

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2023 Panda Forum on Power and Energy, PandaFPE 2023

作者： Ren, Yiming Yuan, Shuai Cheng, Gong Zhao, Qingsheng Wang, Lei Liang, Dingkang Yuan, Minhong Taiyuan University of Technology Shanxi Key Laboratory of Power System Operation and Control Taiyuan China State Grid UHV Transmission CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid Power Supply Company Taiyuan China

ISBN: (纸本)9798350321173

The traditional method for detecting and classifying different types of faults in Ultra High Voltage Direct Current (UHVDC) has low accuracy rate and does not sufficiently exploit the information of timing characteristics in the electrical quantity signals, making it difficult to identify some system faults and measurement faults. This paper presents a fault diagnosis strategy which is based on Gated Recurrent Unit (GRU) to overcome these shortcomings. The study investigates three key GRU training factors, namely the amount of network layers, learning rate, and batch size, which may affect the training effect of GRU. And several sets of experiments are designed to determine the most suitable GRU network parameters. The classification effect of GRU is compared with that of RNN and LSTM, and the experimental results illustrate the high diagnostic accuracy of this approach. In addition, the method does not need to transform the data and can use the initial 1D time-series data as the network input, avoiding the loss of valid information and reducing the complexity of the fault diagnosis process. © 2023 IEEE.

关键词： Failure analysis

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