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SSRN 2023年

作者： Shi, Shuqi Liu, Zongze Ren, Long Lin, Li Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China School of Automation Central South University Changsha410083 China

In general, the wind speed is change with the environment and further has an impact on the power generation of the doubly-fed induction generator (DFIG) system. Besides, the capacitance of DC-link capacitor may change with the working condition. To address this issue, a second-order sliding-mode control (SOSMC) alternatives is put forward to ameliorate the DC-link voltage dynamic performance of the grid-side converter (GSC) for the DFIG system under the variable wind power generation and DC-link capacitance parameter disturbance. In this study, a SOSMC scheme is proposed to replace the conventional proportional integral (PI) control for the DC-link voltage controller of the GSC for the DFIG system. By using the nonlinear SOSMC controller, the DFIG system is robust to the disturbance of the wind speed and the parameter of DC-link capacitance. Compared with the traditional PI regulate scheme, the DFIG system with the proposed SOSMC scheme is much more robust, which has been verified in the MATLAB/Simulink platform. © 2023, The Authors. All rights reserved.

关键词： Sliding mode control

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A Networked Method Applied to Sensitivity Analysis of a VSG controlled BESS system

A Networked Method Applied to Sensitivity Analysis of a VSG ...

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power Engineering (ICPE), International Conference on

作者： Zhiyuan Sun Chao Luo Kun Zheng Yihua Zhu Jiawei Yu Guangxi Power Grid Electric Power Research Institute China Southern Power Grid Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guang zhou China National Energy Power Grid Technology R&D Centre Guang zhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guang zhou China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

The grid-forming battery energy storage system (BESS) plays important role in constructing new energy system. This paper presents a frequency domain modal-based stability analysis of virtual synchronous generator (VSG) controlled BESS. Both ac and dc side interactive dynamics of the grid-tied inverter system are considered, by establishing a hybrid ac/dc impedance network. Then, the frequency domain modal analysis (FMA) method for networked converter systems is applied to the BESS system, covering the eigen-sensitivity from the node level to parameter level. Using this method, key parameters that influence the BESS system’s weakly/negative damping modes most can be better analyzed and identified. The analysis results are validated via the time-domain simulations.

关键词： Battery energy storage system Sensitivity analysis Frequency-domain analysis Modal analysis Stability analysis Synchronous generators Impedance Time-domain analysis Tuning Grid forming

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Large-scale non-real-time Simulation Platform for power systems Based on Cloud Computing

Large-scale non-real-time Simulation Platform for Power Syst...

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

作者： Jingyue Zhang Yuanhong Lu Yufeng Hu Jie Zhang Haiping Guo Libin Huang 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 China Southern Power Grid Co. Ltd Guangzhou China China Southern Power Grid State Key Laboratory of HVDC Electric Power Research Institute Guangzhou China

ISBN: (数字)9798331518066

ISBN: (纸本)9798331518073

The rapid evolution of smart grids has increased the complexity of power system structures and operational characteristics, presenting new challenges in system management and reliability. Traditional power system simulation tools struggle with non-real-time data processing and scalability due to limitations in their architectural designs. Moreover, existing cloud simulation platforms are constrained by closed hardware architectures and lack sufficient non-real-time capabilities. As a solution, we propose a novel large-scale non-real-time simulation platform for power systems based on cloud computing, designed with a modular architecture. By leveraging advanced technologies in cloud computing, parallel computing, and non-real-time simulation, our platform addresses critical needs for scalability, efficiency, and cost-effectiveness. We discuss how integrating these technologies enhances computational performance and supports complex simulation tasks, ultimately improving decision-making and operational efficiency in power system management.

关键词： Cloud computing Scalability power system management Decision making Computer architecture Parallel processing Data processing Computational efficiency Smart grids Reliability

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Case Study of Microgrid operation in the Context of Environment and Energy Storage

Case Study of Microgrid Operation in the Context of Environm...

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International Conference on power and Energy Technology (ICPET)

作者： Shen Na Li Shuyong Guo Changxin Han Fengqin Cai Haiqing School of Electrical Engineering Guangzhou City University of Technology Guangzhou City China State Key Laboratory of HVDC China Southern Power Grid Electric Power Research Institute Co. Ltd. Guangzhou City China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou City China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The global energy crisis and environmental crisis have led to the rapid development of new energy, especially in the context of China's dual carbon strategy target in 2020, the next few decades, the new energy industry in China's energy structure will account for an increasingly high proportion. In order to support the realization of the "double carbon" goal, wind power, photovoltaic and other new energy will play an irreplaceable role. However, a large number of new energy sources connected to the power grid will have some impact on the characteristics of the power system. In order to study the operating characteristics of multiple new energy sources connected to the microgrid, this paper builds a microgrid control simulation platform containing various distributed power sources such as solar, wind, small hydropower, thermal voltaic, and energy storage. The simulation platform is used to study the operating characteristics of various new energy sources in different seasons, load changes and storage capacity changes. The results show that the power output of various new energy sources is influenced by environmental factors, especially photovoltaic, wind power and thermal voltages; energy storage capacity also has an impact on the microgrid system. The research results provide theoretical support for the intelligent control and integrated management of microgrid with multiple new energy sources.

关键词： Photovoltaic systems Wind Thermal factors Microgrids Wind power generation Real-time systems Environmental factors Carbon Energy storage Intelligent control

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Research on power Electronics Converter Real-time Simulation Modeling Method Based on SILDP

Research on Power Electronics Converter Real-time Simulation...

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

作者： Jin Liu Pengbo Han Zeqi Hong Hui Luo Siyang An Shujun Yao School of Electrical and Electronic Engineering North China Electric Power University Beijing China 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 Guangzhou China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

Generally, detailed model of power electronics converter is used in electromagnetic transient simulations. It will use large sources of hardware in FPGA and the speed of simulation is slow. This paper is focus on the modeling method of real-time simulation, and proposed a new model of converter which based on the semi-implicit latency decoupling and paralleling (SILDP) technology. According to the proposed model, the SILDP model of voltage source converter(VSC) is build up. Base on the comparative between the SILDP VSC model and the simulation result waveform of PSCAD model, give the verification that the accuracy and effectiveness of the proposed SILDP VSC model. Finally, the SILDP VSC model is finished the verification in the FPGA experiment platform.

关键词： Accuracy Computational modeling Simulation Voltage Mathematical models Real-time systems Numerical models

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Simulation Testing of Large-Scale Grid-Connected Wind power with Energy Storage system Based on Active Support Performance Evaluation Indices

Simulation Testing of Large-Scale Grid-Connected Wind Power ...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Yihua Zhu Yun Hu Liang Tu Mingzhang Su Chao Luo State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

This paper establishes simulation modeling for large-scale grid connected wind power with energy storage system (ESS). The conventional grid-following (GFL) based ESS is used as a reference object to test the active support performance of large-scale grid-connected wind power with grid-forming (GFM) based ESS with active support performance evaluation indices in different scenarios. (1) Small disturbance evaluation indices: The point of common coupling (PCC) frequency/voltage drop depth and recovery time. (2) Large disturbance evaluation indices: The PCC frequency/voltage drop depth and rise height after fault removal. The output active/reactive power drop depth and rise height/recovery time after fault removal. (3) Island capability evaluation indices: The PCC frequency/voltage fluctuation amplitude at the moment of switching and system stability after switching.

关键词：

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Grid-forming control of VSC-HVDC systems Connecting Asynchronous power Grids

Grid-forming Control of VSC-HVDC Systems Connecting Asynchro...

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power system and Green Energy Conference (PSGEC)

作者： Mingqun Liu Guanming Zeng Xin He Liang Tu Peng He Yihua Zhu Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming 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

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Interconnecting asynchronous power grids with the VSC-HVDC transmission is an important trend. To enhance the weak grid operation performance and grid frequency response capability of the VSC-HVDC system, a novel grid-forming without using the phase-locked-loop is applied in both ends of the VSC-HVDC system. The DC voltage-Active power droop-based grid-synchronization method is utilized. With the proposed method, the sending and the receiving end MMCs perform like a synchronous motor and a synchronous generator, respectively. When the frequency changes in either grid, the system can automatically response to it and change the active power transmission by VSC-HVDC to achieve primary frequency regulation and active frequency support. Finally, the validity of the dual-end grid-forming control is verified based on the simulations in PSCAD/EMTDC.

关键词： power transmission control systems Synchronous motors Market research power grids Synchronous generators Synchronization Phase locked loops Frequency control Grid forming

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Multi-task Transient Contingency Screening with Temporal Graph Convolutional Network in power systems 5

Multi-task Transient Contingency Screening with Temporal Gra...

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2021 5th International Conference on Electrical, Automation and Mechanical Engineering, EAME 2021

作者： Su, Yinsheng Huang, Jiyu Yao, Haicheng Guan, Lin Guo, Mengxuan Zhong, Zhi Department of Power System Operation China Southern Grid Co. Ltd. Guangzhou510641 China School of Electric Power South China University of Technology Guangzhou510641 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China

Rapid transient stability assessment (TSA) is an essential requirement for power system security. In real-world applications, transient contingency screening (TCS) applies TSA approaches to address the pre-defined contingency sets under online operation conditions. TSA by time domain simulation (TDS) is time-consuming, hence we propose a high-speed temporal graph convolutional network (TGCN) that achieves TSA decisions such that a large-scale contingency set can be scanned quickly with enough precision. Based on multi-graph inputs to reflect the transient process, the TGCN utilizes the graph convolutional network (GCN) to extract topology representations and temporal convolution (TC) layers to encode temporal relations. After above graph embedding, two downstream networks are designed for stability classification and critical generator prediction, respectively. Test results on IEEE 39 Bus system demonstrate its superiority over existing models under different operation topologies, fault locations and clearing modes. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Convolution

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Design of Step Motor Automation control system Based on Lyaponov Stability Theory 7th

Design of Step Motor Automation Control System Based on Lyap...

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

作者： Yin, Jin-tian Tang, Jie Liu, Li Luo, Qing-yue Liu, Xin-bo Chen, Wei 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

In order to improve the effect of stepping motor automation, the design method of stepping motor automation control system based on Lyaponov stability theory is proposed. Firstly, AT89C52 MCU is used to optimize the hardware configuration of stepping motor automation control system, and the system operation algorithm and operation steps are perfected. © 2021, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Automation

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Magnetic field simulation and no-load loss calculation of large three-phase five-column disassembled transformer

Magnetic field simulation and no-load loss calculation of la...

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

作者： Zhihua, Peng Yuqing, Sun 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

Due to the limitation of transportation conditions, the volume of the transformer cannot be increased indefinitely. Therefore, it is necessary to disintegrate the iron core for transportation. Due to structural changes, the magnetic field distribution of the transformer core may be disordered and the no-load loss is too large. This paper, based on the field-circuit coupled finite element, conducted the three-dimensional transient electromagnetic field simulation study on the no-load performance of a large-scale three-phase five-column disassembled transformer. The magnetic density, no-load current and no-load loss of the transformer iron core were calculated. The simulation results were consistent with the experiment, verifying the correctness of the simulation method. © 2021 IEEE.

关键词： Magnetic fields

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