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2021 International Conference on Intelligent Computing, Automation and systems, ICICAS 2021

作者： Zhihua, Peng Hongfa, Zeng Mingjian, Tan Jintian, Yin Li, Lin Guohua, Huang Jie, Tang Shaoyang University School of Electrical Engineering Hunan Shaoyang422000 China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Hunan Shaoyang422000 China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hunan Hengyang421001 China

ISBN: (纸本)9781665428101

Limited by road and railway transportation conditions, the volume of large transformers cannot be increased indefinitely. For this reason, it is necessary to compress the height of the transformer core for transportation. However, the change of the core size will cause problems such as uneven distribution of the leakage magnetic field, excessive loss of the leakage magnetic field, and changes in the short-circuit impedance. Based on Magnet software, a three-dimensional transient field simulation analysis of the short-circuit performance of a 500kV single-phase three-column yoke transformer was carried out in this paper, and the leakage magnetic field and winding short-circuit impedance of the yoke transformer were obtained. The simulation results were compared with the experimental values provided by the manufacturer, showing small error, which verified the simulation method, and provided theoretical guidance for transformer design in the actual engineering. © 2021 IEEE.

关键词： Deflection yokes

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Research on Wind Turbine control Hardware in Loop Real-time Simulation and its Application

Research on Wind Turbine Control Hardware in Loop Real-time ...

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Sustainable power and Energy Conference (iSPEC)

作者： Guanming Zeng Liang Tu Yihua Zhu Chengxiang Li Mingqun Liu Peng He State Key Laboratory of HVDC and CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid and National Energy Power Grid Technology R&D Centre and Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou Guangdong Yunnan Power Grid Co. Ltd. Electric Power Research Institute Kunming Yunnan

With the construction of new power system, high-capacity renewable energy sources including wind power are integrated into the power system, whose transient response characteristics have a significant impact on the safe and stable operation of both renewable energy sources and power system. Real-time simulation has become an effective method to study interaction between high-capacity renewable energy sources and power system because of its high accuracy and reliability, and precise wind turbine real-time simulation model is of great significance in research mentioned above. Therefore, the wind turbine control hardware in loop (CHIL) real-time simulation method is proposed in the paper, whose feasibility and accuracy are also verified by comparing simulation data from CHIL platform and on-site testing data. It’s further used in the analysis of large-scale offshore wind farm cluster and connected power system as a practical reference case.

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Adaptive Parameter Determination Method of Synchronous Motor Digital PI Regulator 7th

Adaptive Parameter Determination Method of Synchronous Motor...

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7th EAI International Conference on e-Learning, e-Education, and Online Training, eLEOT 2021

作者： Yin, Jin-tian Liu, Li Tang, Jie Peng, Zhi-hua Li, Hui Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China School of Electrical Engineering Shaoyang University Shaoyang422000 China

ISBN: (纸本)9783030843854

The parameter adaptation of digital PI regulator of synchronous motor has great influence on the production and use of current electric and mechanical equipment. In order to optimize the effect of synchronous electric digital regulator, a method of parameter adaptive determination of digital PI regulator of synchronous motor is proposed, which improves the process of setting parameters in continuous domain. The adaptive parameters of digital PI regulator of synchronous motor are collected and analyzed by discretization method. The sampling time and phase angle lag parameters caused by zero order maintainer are eliminated. The mathematical model of parameters of digital PI regulator of synchronous motor is established, and the discrete model diagram of closed-loop synchronous motor is obtained. The time domain performance index is converted into the open loop frequency domain characteristic quantity by engineering experience and the PI regulator parameters are calculated analytically in the domain. Simulation results show that the adaptive determination method of digital PI regulator of synchronous motor meets the design requirements. The overshoot is less than 5% and the adjustment time is about 1.92 s. The research shows that the method can provide reference for the parameter setting of digital PI regulator of synchronous motor. © 2021, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Synchronous motors

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Research on Active Support control Strategy and its Performance of Renewable Energy power Station with Multiple Energy Sources

Research on Active Support Control Strategy and its Performa...

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

作者： Guanming Zeng Liang Tu Yihua Zhu Yun Hu Chao Luo Shengnan Li State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Yunnan Power Grid Co. Ltd. Electric Power Research Institute Kunming Yunnan

The increasing integration of renewable energy reduces the inertia and frequency support capacity of the power system. The issue of frequency stability has become one of the core issues in the security and stability of power system and the efficient consumption of renewable energy nowadays. To improve the performance of renewable energy power station (REPS), based on the analysis of typical active support control logic and relative performance requirements of REPS with single energy source (SES), an active support control strategy and coordinated control logic of active power of REPS with multiple energy sources (MES) are proposed in this paper. The performance of proposed strategy is theoretically analyzed from the aspect of dominant energy source and the effect of the capacity of energy storage. The effectiveness of the proposed strategy and the accuracy of the theoretical analysis of performance are verified by realtime simulation.

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Comparison and Testing of Equivalent Modeling Methods for Wind Farm Composed of Doubly-Fed Induction Generators

Comparison and Testing of Equivalent Modeling Methods for Wi...

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

作者： Binjiang Hu Yihua Zhu Liang Tu Zun Ma Xian Meng Chao Xing State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Electric Power Research Institute of Yunnan Power Grid Co. Ltd. Kunming China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

For analyzing the power system with high penetration of wind power, it is important to establish accurate models of wind turbines and wind farms, which is a basic and important work. In the analysis of wind power grid integration, it is necessary to aggregate the equivalent value of the wind farm into one or a few wind turbines. At present, there are two commonly used equivalence methods: current source multiplication (commonly used in commercial software) and full dynamic aggregation method. The former achieves wind farm equivalence by multiplying the output current of a single wind turbine generator, while the latter dynamically aggregates the wind farm into one or several large wind turbine generators. There is still a lack of research on the differences between the two. Based on the actual wind farm structure, this paper studies the electrical characteristics of steady-state operation and transient fault ride through operation using single machine dynamic aggregation method and current source multiplication method separately, and compares the equivalent simulation results with the detailed wind farm simulation results. The equivalent accuracy of the single machine aggregation method and the current source multiplication method is calculated to provide a reference for method selection in wind farm equivalent modeling.

关键词： Reactive power Accuracy Simulation power system dynamics Doubly fed induction generators Wind farms Generators Wind turbines Impedance Transient analysis

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Classification of Multiple power Quality Disturbances Based on Continuous Wavelet Transform and Lightweight Convolutional Neural Network

SSRN

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SSRN 2022年

作者： Xi, Yanhui Li, Xule Tang, Xin Li, Zewen Shen, Yin Zeng, Xiangjun Hunan Province Higher Education Key Laboratory of Power System Safety Operation and Control Changsha University of Science and Technology Hunan Province Changsha410114 China

Aiming at the problems of noise interference and too many network parameters for PQDs’ (power quality disturbances) classification based on deep learning, the lightweight convolutional neural network combining maximum likelihood Kalman filter and continuous wavelet transform is proposed. In this proposed method, the disturbed PQD signals are denoised by maximum likelihood Kalman filter, and then the denoised PQDs are converted to time-frequency diagrams, which can provide rich time and frequency domain information, and finally the lightweight convolution neural network is used for automatically extracting and classifying multiple PQDs. To verify the effectiveness and superiority of the proposed method, 20 types of PQDs are tested under different noise levels, and experiment results show that the average classification accuracy reaches more than 99%. Compared with the existing classification methods, the accuracy and noise immunity ability are improved. © 2022, The Authors. All rights reserved.

关键词： Kalman filters

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Revealing the Role of Defect in 3D Graphene-Based Photocatalytic Composite for Efficient Elimination of Antibiotic and Heavy Metal Combined Pollution

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Energy & Environmental Materials 2024年第3期7卷 164-174页

作者： Xin Wang Jingzhe Zhang Hui Wang Mengjun Liang Qiang Wang Fuming Chen Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Electronics and Information EngineeringSouth China Normal UniversityFoshan 528225China School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Hubei Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of TechnologyWuhan 430068China MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

Defect engineering can give birth to novel properties for adsorption and photocatalysis in the control of antibiotics and heavy metal combined pollution with photocatalytic ***,the role of defects and the process mechanism are complicated and ***,TiO_(2)/CN/3DC was fabricated and defects were introduced into the tripartite structure with separate O_(2)plasma treatment for the single *** find that defect engineering can improve the photocatalytic activity,attributing to the increase of the contribution from h^(+)and *** contrast to TiO_(2)/CN/3DC with a photocatalytic tetracycline removal rate of 75.2%,the removal rate of TC with D-TiO_(2)/CN/3DC has increased to 88.5%.Moreover,the reactive sites of tetracycline can be increased by adsorbing on the defective *** defect construction on TiO_(2)shows the advantages in tetracycline degradation and Cu^(2+)adsorption,but also suffers significant inhibition for the tetracycline degradation in a tetracycline/Cu^(2+)combined *** contrast,the defect construction on graphene can achieve the cooperative removal of tetracycline and Cu^(2+).These findings can provide new insights into water treatment strategies with defect engineering.

关键词： 3D graphene Cu defect photocatalytic composite tetracycline

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A capacitor-type DC circuit breaker for offshore all-DC grids

A capacitor-type DC circuit breaker for offshore all-DC grid...

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Energy, power and Electrical Engineering (EPEE), International Conference on

作者： Qianqian Xu Qihui Liu Xipeng Cai Yihua Zhu Chao Luo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9798331518066

ISBN: (纸本)9798331518073

Full DC of offshore wind farms is the future development trend of large-scale offshore wind farms, however, the probability of DC line faults is high, and the use of DC circuit breakers can realise the fault ride-through of offshore full DC wind farms, improve the safe operation of the system during faults, and is one of the mainstream solutions to realise DC fault isolation. In this paper, a capacitive DC circuit breaker suitable for offshore full DC grid is proposed, which can effectively suppress the fault current by introducing a current limiting device. The topology and working principle of this circuit breaker are analysed, and the circuit breaker fault handling process is theoretically analysed. Finally, for the single-end equivalent system using capacitor-type DC circuit breaker, a simulation model is established in Matlab/Simulink software for verification, and the simulation results show that the proposed circuit breaker has a better current limiting effect and has the ability to isolate faults quickly.

关键词： Thyristors Limiting Circuit breakers Simulation Wind farms Software Topology Circuit faults Fault currents Switching circuits

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Design and Implementation of a Cross-Platform Real-Time power system Simulation Software for the New power system

Design and Implementation of a Cross-Platform Real-Time Powe...

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Intelligent power and systems (ICIPS), International Conference on

作者： Ying Huang Yuanhong Lu Jingyue Zhang Jie Zhan Yanjun Zhao Yufeng Hu State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou 510663 China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou 510663 China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou 510663 China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou 510663 China Southern Power Grid Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou Guangzhou China

ISBN: (数字)9798331532765

ISBN: (纸本)9798331532772

With the rapid increase in renewable energy installation nodes and the substantial enhancement of switching frequencies in the new power system, this paper proposes a design scheme for a cloud simulation software that employs the Latency Insertion Method (LIM) to decompose large-scale new power system models into several subsystems, enabling multi-platform integrated parallel computing. The self-developed platform meets the demands of ultra-large simulation scales, ultra-small simulation time steps, and massive simulation computations in power systems. Experimental results demonstrate that the accelerated simulation technology, which integrates model segmentation using LIM with multi-core parallel execution, can enhance the simulation speed by up to 858 times while maintaining simulation accuracy. This significantly improves simulation efficiency and is suitable for large-scale simulations of new power systems.

关键词： Renewable energy sources Accuracy Computational modeling Switching frequency Software algorithms Random access memory Parallel processing Software Real-time systems power systems

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Optimization Scheme Research of WFPDL Strategy for Yongren-Funing HVDC Transimission Project Based on RTDS Closed-loop Real-time Simulation 4

Optimization Scheme Research of WFPDL Strategy for Yongren-F...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： He, Ye Zhu, Yukun You, Guangzeng Zhang, Jingpei Guo, Hengdao Sun, Peng Yunnan Power Grid Co. Ltd. Power Planning and Research Center Kunming China China Southern Power Grid State Key Laboratory of Hvdc Electric Power Research Institute Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728171494

The ±500kV Yunnan Yongren-Funing DC transmission project is the first HVDC project whose starting point and landing point are both in the same province. It is located in a weak AC system, the transmission line is short and the smoothing reactor has a low inductance value. When a short-circuit fault occurs outside the DC line protection zone, the DC line traveling wave protection (WFPDL) is prone to misoperation and does not meet the requirements of protection reliability. This article analyzes and accurately locates the defects of the original WFPDL strategy, and proposes a scientific and reasonable optimization scheme for the threshold of voltage mutation du/dt. After RTDS simulation analysis and verification, it shows that the scheme not only improves the reliability of WFPDL effectively, but also meets the requirements for selectivity, speediness and sensitivity, and does not affect the operation characteristic of voltage mutation protection 27du/dt, which is also related to the threshold of du/dt, all the DC line protections can still cooperate correctly. The optimization scheme is permanently implemented on site, and a number of artificial short-circuit tests have been carried out within and outside the DC line protection zone. The results show that in the transient process of faults, the control and protection system of HVDC, travelling wave fault location devices, stability control devices and 3 STATCOMs of inverter station can all respond correctly, their functions and dynamic performance meet the system requirements. © 2021 IEEE.

关键词： Reliability analysis

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