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Modified Dynamic Model and Small-signal Stability Analysis for LCC- hvdc systems

CSEE Journal of power and Energy systems 2025年第2期11卷 750-759页

作者： Chunyi Guo Jiaqing Zhang Shuo Yang Huan Li Chuang Fu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDCGuangzhouChina

Inaccuracy of modeling for line commutated converter based high voltage direct current (LCC-hvdc) systems will degrade the reliability of small-signal stability analysis results. Taking a practical project as the study system, this paper establishes a modified dynamic model by modifying the current switching function, firing angle calculation and DC voltage calculation. Then, the accuracy of the modified model is verified by a detailed electromagnetic transient (EMT) simulation. Finally, with the modified dynamic model, the impact of the control parameters and AC system strength on the small-signal stability of the overall system is investigated by adopting the eigen-analysis. The results clearly demonstrate that the modified model shows higher accuracy than the original model.

关键词： LCC-hvdc modified dynamic model practical project small-signal analysis

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

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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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Multi-Objective Coordination and Stability Control of High Proportion Wind power system Based on K-Domain Tuning Damping 19th

Multi-Objective Coordination and Stability Control of High P...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Zhang, Qingtao Gao, Diju Zhang, Dan Cai, Haiqing Gu, Haohan Chen, Wei Wu, Wencong Chen, Zhihao Institute of Logistics Engineering Shanghai Maritime University Shanghai China Institute of Logistic Science and Engineering Shanghai Maritime University Shanghai China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&D Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9789819608966

With the further development of "double high" characteristics of power system, the traditional stability problem dominated by synchronous generator has gradually evolved into a new stability problem dominated by power electronic equipment control. In addition, different types of failure problems can occur in wind power systems. In order to achieve multi-objective coordinated and stable operation of high proportion wind power system, a damping control method with parameters tuning is proposed, which includes the design of filtering link and proportional amplification link. Among them, the key parameters of the proportional link are adjusted. Finally, the feasibility of the proposed control method is verified by simulation tests. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Electric power system stability

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Inter-Turn Fault simulation for Three-Phase Transformer 11th

Inter-Turn Fault Simulation for Three-Phase Transformer

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Liu, Jun Huang, Linyu Xu, Shurong Chen, Peilong Li, Kun Mao, Xianyin Zeng, Huarong Gao, Yong Electric Power Research Institute Guizhou Power Grid Company Ltd. Guiyang550000 China Chongqing University Chongqing400044 China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou510663 China

ISBN: (纸本)9789819788156

The three-phase transformer is a core component of the power system. As there are electromagnetic couplings within and between windings, the complexity of the inter-turn fault analysis increases. An accurate transformer model benefits the analysis of short-circuit faults. Transformer models mainly include finite element models and electromagnetic transient models. The simulation time of the finite element model is positively related to the complexity of the model. Therefore, the finite element model has the disadvantage of long simulation time. Electromagnetic transient model can be divided into circuit model and magnetic circuit model. On one hand, circuit models cannot directly describe the physical properties of three-phase transformers. On the other hand, the accuracy of magnetic circuit models depends on the accurate analysis method of the transformer magnetic circuit structure. While the analysis of the interphase coupling relationship of three-phase core-type transformers is difficult. In this paper, the interphase coupling characteristics of three-phase core-type transformers are fully considered. A mathematical model is constructed that can accurately characterize the physical properties of transformers. The accurate representation method of interphase coupling relationship of three-phase core-type transformers is proposed. Finite element model and electromagnetic transient model are used to conduct inter-turn fault tests to verify the correctness of the model. The new model provides a model foundation for transformer inter-turn fault research. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Transformer magnetic circuits

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Comparison of the Transient Characteristics of the GFL and GFM Converters in a hvdc-HVAC Hybrid power system 11th

Comparison of the Transient Characteristics of the GFL and G...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Sun, Pengwei Zhou, Baorong Guo, Zhifei Chen, Zhiying Guan, Lin State Key Laboratory of HVDC CSG Electric Power Research Institute No.11 Kexiang Road Huangpu District Guangzhou510663 China School of Electric Power Engineering South China University of Technology Guangzhou510640 China

ISBN: (纸本)9789819788194

With the deployment of renewable energy and the voltage source converter (VSC) based hvdc transmission systems (VSC-hvdc), the dynamic behavior of power systems has been greatly changed by the VSC sources, and the grid-forming (GFM) control framework of VSC is now widely concerned for the purpose of transient performance enhancement. In this paper, a hvdc and HVAC hybrid power system is constructed on PSCAD with the grid-following (GFL) and grid-forming (GFM) converters being connected and compared, where the GFM converter employs the virtual synchronous generator (VSG) control. The power system transient characteristics, including the swing angle, the bus voltage and system frequency characteristics during AC/DC fault scenarios are presented. The influence of GFL and GFM converters are compared and analyzed. In addition, an instability phenomenon caused by the current limiting link of the VSG control is discussed in the end of the paper. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Hybrid power

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simulation study of charge distribution characteristics on the surface of silicon nitride ceramics

Simulation study of charge distribution characteristics on t...

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2024 International Conference on Automation, Electrical Control systems and Equipment, AECSE 2024

作者： Zhang, Jinyin Xu, Xiaoyu Wei, Xiaoxing Huang, Chen Yu, Zexuan Qi, Bo Electric Power Research Institute CSG EHV Power Transmission Company Guangzhou510062 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

Pure SF6 gas-insulated high-voltage DC through-wall casings use internal epoxy resin pillar insulators. During operation, temperature gradients and the long-term effects of the DC electric field lead to the accumulation of surface charge on the gas-solid insulation surface. This accumulation can easily trigger flashovers along the insulator's gas-solid interface. The charge distribution characteristics of silicon nitride material in the DC electric field are less influenced by temperature gradients, making it a viable substitute for epoxy resin materials used in SF6 gas insulation support. In this paper, for the spatiotemporal variation of surface charge of epoxy resin and silicon nitride ceramic materials under a DC electric field, the material parameters are set based on the measured resistivity-temperature variation curves of epoxy and silicon nitride. The SF6 gas flow is considered to obtain a more accurate temperature distribution through the coupling of the heat flow field. The Schottky injection equation is introduced to take into account the influence of the surface charge accumulation process over a long period and to establish a more precise temperature distribution under the coupling of the DC electric field, the heat flow field, and the gas laminar flow field. The surface charge simulation model of epoxy and silicon nitride ceramics considering Schottky injection and bipolar carrier migration and transport model in SF6 under the multi-field coupling of the gas laminar flow field is established to analyze the dominant mechanism of the surface charge accumulation of epoxy and silicon nitride ceramics under the effect of the measured temperature gradient and to analyze the long-term change rule of the surface charge in the space and time. © Published under licence by IOP Publishing Ltd.

关键词： Silicon nitride

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Stabilization domain study of islanded photovoltaic via MMC-hvdc transmission system 4

Stabilization domain study of islanded photovoltaic via MMC-...

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4th International Conference on Energy Utilization and Automation, ICEUA 2025

作者： Zhang, Lidong Zhang, Shuwen Guo, Chunyi China Southern Power Grid CSG Electric Power Research Institute Guangdong Guangzhou China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

The large-scale integration of renewable energy can promote cleaner and lower-carbon energy utilization;however, it adversely affects the safe and stable operation of the power system. To address this issue, this paper first establishes a mathematical model and state-space model for islanded photovoltaics via the MMC-hvdc transmission system. Subsequently, it integrates considerations of steady-state electrical parameters and small-signal stability to propose a method for calculating the system's stability domain. Based on this, the study investigates the stability domain of islanded photovoltaic via MMC-hvdc transmission system and analyzes the impact of photovoltaic transmission line length and control parameters on system stability. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： state space methods

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Voltage support ability assessment of grid-forming converters integration in power systems

Voltage support ability assessment of grid-forming converter...

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18th International Conference on Developments in power system Protection (DPSP APAC 2025)

作者： Yiwen Hu Songhao Yang Dongxu Chang Guosong Wang Bingfang Li Yihua Zhu Zhiguo Hao Xi'an Jiaotong University Xi'an People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute CSG Guangzhou People's Republic of China Dispatch and Control Center of Guizhou Power Grid Company Guiyang People's Republic of China

ISBN: (数字)9781837242900

As the installed capacity of renewable energy continues to increase, the inertia and short-circuit capacity of the system continues to decline, arising significant risks for the power system security. The grid-forming technologies is of great significance in solving this problem, attracting wide attentions. Compared with the grid-following converters, the grid-forming converters have good frequency and voltage support capabilities, and have great application prospects in the context oflarge-scale grid-connection of new energy sources. The aim of this paper is to investigate the voltage support ability of the grid-forming converters on power systems. Firstly, a voltage support capability indicator is proposed for the voltage stability issues. Secondly, a mathematical model of the grid-forming converter is developed to investigate its active and reactive power support characteristics. The key parameters of the grid-connected renewable energy are identified via the proposed indicator. On this basis, evaluation indexes for grid-connected renewable energy to improve the voltage support capability of the system are proposed. Finally, the effectiveness of the proposed evaluation methodology is verified by simulation.

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