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2021 International Conference on Electrical Engineering and Computer technology, ICEECT 2021

作者： Chen, Qi Liu, Hongbo Hao, Qingxiang Yin, Yikun Li, Yuanhong Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China Zaozhuang Power Supply Company State Grid Shandong Electric Power Company Zaozhuang277000 China Changchun Institute of Technology ChangChun130012 China

In this paper, an active damping control strategy based on capacitance and voltage feedback is proposed to solve the resonance problem of three-phase LCL inverter grid-connected system. To solve the problem that the parameters of active damping control strategy are complicated and need to be adjusted repeatedly, a parameter design method is proposed in this paper, which is simple to implement and does not need to be adjusted repeatedly. Finally, the effectiveness of the control strategy and parameter design method is verified by experiments. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Capacitance

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Economic Analysis of energy Storage Peak Shaving Considering Full Life Cycle Cost 5

Economic Analysis of Energy Storage Peak Shaving Considering...

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5th IEEE International Electrical and energy Conference, CIEEC 2022

作者： Li, Junhui An, Chenyu Zhang, Jingxiang Li, Cuiping Zhao, Haiji Yu, Jun Jin, Xuezhu Hou, Kaiyuan Xu, Fei Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132012 China Northeast Branch of State Grid Corporation of China Liaoning Shenyang110180 China Haidian District Beijing100084 China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

As an effective means to improve the wind power consumption capacity of power system, the economy of energy storage participation auxiliary service has received extensive attention from academic circles. In this paper, the cost composition of the whole life cycle of the electrochemical energy storage system is comprehensively considered, and the economic analysis of different Wheres of electrochemical energy storage participating in peak shaving auxiliary services is conducted according to the operation rules of the power market in northeast China. Firstly, four widely used electrochemical energy storage systems were selected as the representative, and the control strategy of source-side energy storage system was proposed for real-time peak modulation in wind farms. Secondly, the peak shaving economic model based on the life cycle cost of energy storage is constructed. Finally, by selecting the annual data of a wind farm in northeast China, the economic benefits of different Wheres of electrochemical energy storage are analyzed and compared, and the reasonable opinions on improving the benefits of energy storage are given. © 2022 IEEE.

关键词： Life cycle

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Investigating the transient torque of turbo-generators in a power system integrating wind farms 8

Investigating the transient torque of turbo-generators in a ...

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8th renewable power Generation Conference, RPG 2019

作者： Yang, Bowen Yan, Gangui Xie, Xiaorong Wang, Yanhui Tang, Jian Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China State Grid East Mongolia Electric Power Supply Co. Ltd. Hohhot China

ISBN: (纸本)9781839531255

The renewable energy sources connected to the grid will cause the power system to oscillate and even affect neighbouring turbo-generators. For example, the wind turbines and their converter control systems may cause shaft torsional vibration in the steam turbine units, which affects the safety of the system. Therefore, it is of significance to investigate the transient torque of turbo-generators in a power system integrating wind farms. This paper takes a power plant in Inner Mongolia area of China as the case, the power of which is transmitted via the AC/DC hybrid power system with wind and thermal power. A typical equivalent system model of the wind-thermal-bundled access network is established firstly. Consider setting the fault on the line with series capacitor compensation and observe units' torque variation. Then the impact on sub-synchronous resonance (SSR) characteristics from many factors was investigated through the time-domain simulation, including the unit combination mode (including the long-term accessed DFIGs condition), the fault type and position, the system equivalent impedance, the fault starting/clearing time and the mechanical mutual damping coefficient of shafting, etc. Finally, the influence of each factor on transient torque is summarized, and the inner associations between the shaft torsional vibration in the turbo-generators and the converter-based wind turbines are clarified. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Wind turbines

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Research on Partition Method of Distributed Photovoltaic Cluster Based on Modularity Index and Absorption Ability 2

Research on Partition Method of Distributed Photovoltaic Clu...

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2nd International Conference on Smart Grids and energy Systems, SGES 2023

作者： Meng, Tao Lv, Xiangyu Li, Chenggang Li, Dexin Zhang, Yifu Meng, Xiangdong State Grid Jilin Electric Power Co. Ltd. Electric Power Research Institute China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education School of Electrical Engineering Changchun Jilin China

ISBN: (纸本)9798350371659

To achieve large-scale renewable energy, grid friendly coordination and the need to maximize grid-connection and consumption functions, the clustering method has become a forward-looking solution for distribution network planning, construction and dispatching control. In this paper, the modularity index and active power balance index based on electrical distance are taken as the comprehensive classification index. Then genetic algorithm is introduced to divide the distributed PV cluster in the distribution network. Finally, a 10kV distribution system is taken as an example, and the distributed photovoltaic cluster planning is simulated and analyzed, which proves that the distributed photovoltaic cluster division method is effective. © 2023 IEEE.

关键词： Genetic algorithms

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Resilience Assessment of power Transmission Systems Under Extreme Ice Disaster 10th

Resilience Assessment of Power Transmission Systems Under Ex...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Li, Dexin Wu, Xinyu Gao, Song Zhuang, Guanqun Wang, Changjiang Electric Power Research Institute State Grid Jilin Electric Power Supply Co. Ltd. Changchun130021 China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin132012 China

ISBN: (纸本)9789819934034

The occurrence of ice disasters poses a great threat to the normal transmission system operation. To better complete the toughness evaluation of the system under ice disaster, firstly, an attack model considering the instantaneous wind speed and accumulated ice thickness of the line is established. Secondly, combined with the disaster degree of the line and the initial design data, the fault probability of the line is estimated, and the system load reduction model is used to determine the affected degree of the system. Then, a resilience evaluation index focusing on the degree of system damage under extreme ice disasters is proposed. Taking the IEEE-39 bus system as an example, the feasibility of the proposed index is verified, and two elastic improvement measures are adopted to verify the practicability of the index. The simulation results of an example show that this resilience evaluation index can directly reflect the impact of extreme ice disasters on the resilience of the transmission system and can better see the effect of different resilience improvement methods on the resilience of the transmission system. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Disasters

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Multi-objective optimal dispatch method based on source-network-load-storage interaction system for DC distribution network 8

Multi-objective optimal dispatch method based on source-netw...

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8th renewable power Generation Conference, RPG 2019

作者： Quan, Ran Li, Guoqing Jin, Guobin Liu, Zhao Chen, Qing Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Grid Jiangsu Electric Power Co. Ltd. Nanjing China Jiangsu Electric Power Company Research Institute Nanjing China

ISBN: (纸本)9781839531255

The DC distribution network can integrate the photovoltaic power generation system with high efficiency, but the random fluctuation of the photovoltaic output power is strong and there is a problem of PV consumption, which has a certain degree of impact on the economic optimization operation of the system. Therefore, the source-network-load-storage optimization interaction concept is introduced in the DC distribution network. Based on the in-depth analysis of the interactive load characteristics, the interaction load and energy storage technology can be fully utilized to the system to consumpt the photovoltaic. Combined with the features of DC distribution network structure, comprehensively consider the impact of the interactive load and energy storage system collaborative optimization on the system operating cost and power flow distribution, so that both the power generation side and the power side can participate in the resource optimization configuration of the grid operation. A multi-objective optimal scheduling model for photovoltaic DC distribution networks with operational cost, network loss and voltage deviation is established. The simulation example shows that: Collaborative optimization using interactive load and energy storage system can greatly reduce system operating cost, network loss and voltage deviation, effectively improve the level of PV consumption, and realize safe and reliable operation of DC distribution network. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： energy storage

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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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