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Enhanced Transient Stability Strategy for Grid-Forming Converter Based on Current Limiting

CSEE Journal of power and energy systems 2025年第3期11卷 960-971页

作者： Zhenglong Sun Zhifeng He Naiyuan Liu Rui Zhang Bo Wang Guowei Cai Department of Electrical Engineering Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin China

With the sustained increase in the penetration rate of grid-forming (GFM) converters in power systems, problems such as overcurrent and transient instability during system faults have drawn significant attention. This paper proposes an enhanced dynamic dq-axis current-limiting strategy (ED-CLiS) for GFM converters, which improves transient stability across all stages before and after current limiting. First, a dynamic dq-axis current-limiting strategy (D-CLiS) is proposed. This strategy regulates the power angle to prevent it from going out of control during current limiting, which is achieved by controlling the $d$ - and $q$ -axis current reference values to reshape the ${P}-\delta^{\prime}$ curve. Additionally, a large reverse acceleration area can induce excessive angle $\delta^{\prime}$ swings, causing the D-CLiS to be triggered repeatedly and resulting in converter instability after the control exit, even without faults. A reference power control structure (RPCS) is proposed, which suppresses the phenomenon by adjusting the power reference value to control the converter's reverse acceleration area. Finally, the control strategy is verified through simulations.

关键词： Transient analysis power system stability Grid forming Stability criteria Voltage control Circuit stability Limiting Mathematical models Circuit faults Synchronous generators

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Coupling Analysis and Protection Design of Substation Grounding Grid and Surrounding Metal Pipe Grid 3

Coupling Analysis and Protection Design of Substation Ground...

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3rd International Conference on Machine Learning and Big Data Analytics for IoT Security and Privacy, SPIoT2023

作者： Wang, Tao Yuan, Haojie Zheng, Xuan Song, Mengqing Ma, Chenglian Shandong Electric Power Engineering Consulting Institute Co. Ltd. Jinan China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology 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. © 2023 Elsevier B.V.. All rights reserved.

关键词： Electric grounding

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Carbon Emissions Constraint Distributed Low-carbon Economic Dispatch of power system 7

Carbon Emissions Constraint Distributed Low-carbon Economic ...

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7th IEEE International Conference on power and renewable energy, ICPRE 2022

作者： Li, Junhui Shao, Yan Zhu, Xingxu Li, Cuiping Ministry of Education Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Jilin132012 China

ISBN: (数字)9781665450638

ISBN: (纸本)9781665450638

In order to meet the emission reduction requirements of integrated energy power system, the global inequality constraint is added to the economic dispatch model to reduce the carbon emission of the system by regulating the output of the unit, but it is difficult to achieve distributed solution. In order to solve the distributed low-carbon economic scheduling problem with global inequality constraints, a distributed economic scheduling solution method is proposed based on the existing research results. This method is based on dual theory and variable decomposition method to decompose it into sub-problems related to each virtual power generation unit (Agent). The alternating direction multiplier method (ADMM) algorithm is used to realize distributed economic scheduling through the exchange and iteration of Lagrange multiplier information between adjacent Agents, and meet the demand of "plug and play"of the optimization unit. Finally, the effectiveness of the proposed method is verified by an IEEE-6-bus system. © 2022 IEEE.

关键词： Lagrange multipliers

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Analytic Mechanism for the Cumulative Effect of Wind power Fluctuations from Single Wind Farm to Wind Farm Cluster

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CSEE Journal of power and energy systems 2022年第5期8卷 1290-1301页

作者： Gang Mu Fangze Wu Xiaoping Zhang Ziheng Fu Bai Xiao Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China Department of Electronic Electrical and Systems EngineeringSchool of EngineeringUniversity of BirminghamBirmingham B152TTU.K

The use of wind power is rapidly growing worldwide as a means of reducing carbon emissions for the energy *** has the world’s largest wind power installation and multiple large-scale wind farm clusters,each comprising dozens of wind *** the planning and operation of the power system,it is important to understand the power fluctuation characteristics of wind farm *** studies demonstrate that the relative power fluctuation of a wind farm cluster is less than that of a single wind *** this decreasing trend a random occurrence or does it have a regular pattern?This scientific question is addressed by investigating the mechanism of the cumulative effect of a wind farm *** this study,a cumulative model is proposed by examining the spatiotemporal relationships of wind power variations and wind farm *** gain function and critical cumulative frequency are defined as the foundations to analytically describing the cumulative *** investigating the cumulative effect mechanism,the relationship between power fluctuation and spatiotemporal parameters of the wind farm cluster are *** power fluctuation of a cluster can be predicted using the cumulative model even before it is completely *** mechanism of the cumulative effect is validated on the basis of the data of two actual wind farm clusters.

关键词： Analytic mechanism cumulative effect evolution regularity wind farm cluster wind power fluctuation

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Real-time Optimal energy Management of Combined Cooling, Heating and power systems Based on Knowledge conlusion 6

Real-time Optimal Energy Management of Combined Cooling, Hea...

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6th IEEE International Electrical and energy Conference, CIEEC 2023

作者： He, Chunjiang Wang, Yijian Xu, Yang Cui, Yang China Electric Power Research Institute State Key Laboratory of Power Grid Security and Energy Conservation Beijing China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Jilin China

ISBN: (纸本)9798350346671

Combined Cooling, Heating and power(CCHP) system is an important way to improve the efficiency of energy utilization and wind power consumption. In this case, increasing the operational flexibility of CCHP systems can help increase renewable energy consumption and reduce carbon emissions. So, it is necessary to provide real-time optimal energy management(OEM) for CCHP systems. In this paper. Firstly, a new training method is proposed for the LightGBM to improve the accuracy of real-time wind power prediction. In addition, to solve the nonlinear OEM of CCHP in real-time, a novel deep reinforcement learning algorithm-Soft Actor-Critic, is used in this paper. By combining the mechanism of CCHP with the reward function through knowledge fusion, the non-convex models can be translated into Markov Decision Processes(MDP), and then according to the Bellman optimal equation, the real-time optimized operation of the CCHP system is realized. Finally, the effectiveness of the proposed policy is verified by the actual operation data of a CCHP system in Northwest China. © 2023 IEEE.

关键词： Reinforcement learning

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The Characteristics and Suppression Protection Measures of AC Filter Closing Inrush Current Considering Residual Voltage and Residual Charge

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Engineering Letters 2024年第12期32卷 2191-2199页

作者： Gao, Hongguang Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

In recent years, China has implemented numerous ultra-high voltage direct current transmission projects, offering notable advantages such as high stability, low losses, and cost-effectiveness. These projects necessitate frequent switching of AC filters at converter stations to meet reactive power requirements. During filter switching, a substantial closing inrush current is generated. The capacitors in AC filters, made up of multiple small capacitors in series and parallel, can retain residual charge and voltage if flashovers occur in some capacitors. Moreover, due to the capacitors' memory effect, rapid re-closing of the AC filter shortly after system operation can result in residual voltage, leading to a larger closing inrush current. This study presents a residual charge calculation model for high-voltage capacitors and a residual voltage model for quick re-closing scenarios established through PSCAD/EMTDC simulations. The research not only analyzes the detrimental effects of closing inrush current and overvoltage on the filter system caused by residual charges and voltage but also proposes innovative solutions with practical implications. To expedite the discharge of capacitors with residual charges, a novel adjustable discharge resistance model is proposed, which can enhance discharge speed by four times, significantly improving the efficiency and safety of high-voltage transmission systems. In addition, this paper introduces a new type of capacitor flashover fault identification method, which can achieve more accurate identification of the fault location and the number of capacitors that flashover occurs, thereby significantly facilitating the maintenance and troubleshooting of high-voltage systems. © 2024, International Association of Engineers. All rights reserved.

关键词： Cost effectiveness

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Vibro-Acoustic Analysis for Transformer under DC Bias Based on Electromagnetic Coupling

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Progress In Electromagnetics Research B 2024年 104卷 171-186页

作者： Pan, Chao Shi, Xiaobo Fu, Tongrui An, Jingge Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China

Aiming at the operational stability of DC-biased transformer, a multi-parameter correlation method based on electromagnetic coupling is presented in this paper. The mode-state analysis scheme is designed, and the feature parameters of electromagnetic, mechanical, and acoustic fields in internal components are simulated and analyzed. The electromagnetic properties under DC bias are simulated by the electromagnetic model, thus the winding current and magnetic flux density are extracted as the feature parameters. Then the vibration and stress distribution can be solved by the mechanical model, which are treated as the feature parameters of the mechanical field. By utilizing the computed mechanical information as excitation, the spatial-temporal distribution of sound pressure can be obtained in the acoustic model. Taking three-phase three-limb transformer and three-phase group transformer as examples, the electromagnetic, mechanical, and acoustic parameters of components are analyzed under different conditions. The variations of feature parameters are summarized and contrasted. Furthermore, actual vibration and noise parameters are measured through dynamic experimental platforms. The effectiveness of the multi-parameter correlation method is verified by the consistency between simulation and experiments, and the unobservable abnormal physical features can be represented by observable electrical information. © 2024, Electromagnetics Academy. All rights reserved.

关键词： Correlation methods

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Analyzing the Coupling of PMSG control Parameters With Operation Conditions and Grid Strength: A Perspective on Subsynchronous Oscillations

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IEEE Transactions on power systems 2024年

作者： Yan, Gangui Yang, Cheng Wang, Yupeng Yang, Dejian Mu, Gang Northeast Electric Power University Key Laboratory Of Modern Power System Simulation And Control & Renewable Energy Technology Ministry Of Education Jilin132012 China

Subsynchronous oscillation (SSO) in grid-connected permanent magnet synchronous generators (PMSG) arises from the combined effects of control parameters, operating conditions, and grid strength. Existing studies focus on the design of converter control parameters but overlook their adaptability to changes in operating conditions and grid strength. This oversight can lead to challenges in adapting fixed control parameters to varying conditions, potentially inducing SSO. This paper develops a multi-damping path model to analyze the SSO characteristics of grid-connected PMSG systems. It quantitatively evaluates how changes in operating conditions and grid strength affect the adaptability of control parameters and SSO damping. The study reveals the intricate coupling relationship between the feasible domain of control parameters under stability constraints and variations in grid strength and operating conditions. It confirms that in certain scenarios, a single set of control parameters may not meet the stability requirements across different operating conditions and grid strengths. The effectiveness of the proposed model and the theoretical analysis results are verified through simulations. The findings provide essential theoretical guidance for the adaptive adjustment of control parameters in grid-connected PMSG systems under various operating conditions and grid strengths. © 1969-2012 IEEE.

关键词： Damping

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Cooperative control Strategy of Regional energy Storage and Thermal power Generation Considering Frequency Dynamic Response 9

Cooperative Control Strategy of Regional Energy Storage and ...

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9th Asia Conference on power and Electrical Engineering, ACPEE 2024

作者： Li, Junhui Yu, Zhenbo Zhao, Yang Ma, Jie Jiang, Xiaoliang Yu, Haozheng Zhu, Xingxu Li, Cuiping Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin China State Grid Henan Electric Power Company Development Planning Department Zhengzhou China Planning and Assessment Centre State Grid Henan Electric Power Company Zhengzhou China

ISBN: (纸本)9798350309638

With the continuous promotion of the goal of 'carbon peak, carbon neutral', China is building a new type of power system in which the proportion of wind power/photovoltaic energy is gradually increasing, but the scenario of a high proportion of renewable energy will also bring the overall system frequency regulation pressure due to the shortage of frequency modulation(FM) capacity and other problems. This paper firstly quantifies the system frequency dynamic response(FDR) modeling under the scenario of high proportion of renewable energy, and derives the expression of the system overall frequency fluctuation characteristics;then according to the quantitative analysis results, it proposes the strategy of coordinating the conventional thermal power units with regional energy storage (ES) for joint frequency regulation, combining with regional ES for fast regulation and bidirectional response to meet the demand of system frequency regulation;finally, it carries out the case study with the northwestern regional grid, and the results show that the system frequency regulation reasonably meets the operational requirements and accurately verifies the validity of the proposed strategy. © 2024 IEEE.

关键词： Frequency response

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Mobile Hybrid Distribution Transformer Deployment Strategy Based on Spatial Coordinate system Mapping Optimization

Mobile Hybrid Distribution Transformer Deployment Strategy B...

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China International Conference on Electricity Distribution, CICED

作者： Yibo Wang Kaipu Liu Chen Liu Yu Liu Zhanhui Du Yuan Wang the Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Northeast Electric Power University Jilin China

ISBN: (数字)9798350368345

ISBN: (纸本)9798350368352

Under the background of ‘double carbon’, the power system is facing green change, and the distribution network is facing the challenge of distributed generation and diversified load. Traditional distribution transformers are unable to cope with local load peaks and sudden load growth. In order to cope with the problem of heavy overload caused by seasonal load, mobile hybrid distribution transformer (MHDT) has gradually attracted attention as an innovative solution. In this paper, the deployment strategy of MHDT is discussed, and an optimization method based on spatial coordinate system mapping is proposed to reduce the amount of calculation and improve the computational efficiency. Through the practical application case of an agricultural irrigation area in Jilin Province, the actual effect of this method in solving the problem of transformer heavy overload is verified. The results show that MHDT can effectively improve flexibility response ability of distribution system.

关键词： Irrigation Optimization methods Distribution networks Transformers Emergency services Stability analysis power electronics Hybrid power systems Distributed power generation Reliability

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