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IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Junwei Huang Wujie Chao Chaoping Deng Liyu Dai Jinke Wang Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

ISBN: (数字)9798350370805

ISBN: (纸本)9798350370812

The modular multilevel converter based battery energy storage system (MMC-BESS) has the problem of pulsating current affecting battery life, and the high cost of retrofitting traditional modular multilevel converter (MMC) stations. The proposed DC direct-mounted energy storage topology in this paper is battery friendly and required number of battery cells is only 1/6 of MMC-BESS, greatly saving costs. This paper analyzes the topology structure and working principle of DC direct-mounted energy storage devices, and proposes a design method for the DC direct-mounted energy storage devices. The proposed design method is validated through simulation and prototype experiments. The simulation and construction of a DC 750V prototype have verified that the prototype has achieved good charging and discharging functions for DC energy storage, with small fluctuations in DC grid connected current and good power control effect. This study can provide reference and guidance for the design and application of high-voltage and high-capacity direct current energy storage devices that support offshore wind power to move towards the deep sea in the future.

关键词： Multilevel converters Fluctuations Costs Power control Prototypes High-voltage techniques Wind power generation Topology Batteries Energy storage

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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems

Analysis of Ultra-low Frequency Oscillation Stability of Pow...

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International Conference on Power and Energy Technology (ICPET)

作者： Kesu Cai Dongsheng Liu Wenshuo Zhao Xi Hong Yao Yin Xuanqu Fei State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The Low-Frequency Oscillation (LFO), Ultra-Low Frequency Oscillation (ULFO) and other oscillation can endanger the safety and stability operation of the power grid. However current relevant standards only have clear provisions on the critical damping ratio of LFO. Based on the risk of ULFO in high proportion hydropower systems, the principle and key influencing factors of ULFO are derived theoretically. According to the characteristics and hazards of ULFO, a method for determining the critical damping ratio of ULFO is explored, and the effectiveness of the method is tested through the actual response trajectory.

关键词： Damping Stability criteria Hydroelectric power generation Power system stability Attenuation Power grids Hazards Trajectory Oscillators Standards

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Capacitance Current Compensation Method for Cable-Overhead Hybrid Transmission Lines 5th

Capacitance Current Compensation Method for Cable-Overhead H...

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International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2020

作者： Yao, Gang Wu, Tonghua Zheng, Yuping Teng, Xianliang Hong, Feng Chen, Guozhou NARI Group Corporation Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9789811597459

At present, the capacitance current compensation technology for transmission line differential protection is based on uniform parameters of entire lines, so it cannot be adapted to cable-overhead hybrid transmission lines. In this paper, a steady-state compensation method based on segment parameters, a time-domain compensation method based on whole line equivalent parameters and a time-domain compensation method based on segment parameters are proposed, which can adapt to different application scenarios, such as hybrid lines with shunt reactance at the ends and junctions. A PSCAD/EMTDC simulation shows that when a hybrid transmission line is short, the time-domain compensation method based on whole line equivalent parameters is simple to implement, and it can effectively compensate the capacitance current of hybrid transmission lines. The time-domain compensation method based on segment parameters can accurately compensate the capacitance current of hybrid transmission lines, taking into account the reliability and sensitivity of differential protection. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Cables

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Evaluation Approach for CPS Assessment Fee Return Method Based on Sequential Game of Two Provinces 9

Evaluation Approach for CPS Assessment Fee Return Method Bas...

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

作者： Miao, Yuancheng Wang, Lifeng Chen, Zijie Li, Yutong Song, Bingbing Teng, Xiaobi Dispatch and Control Branch Center East China Branch of State Grid Corporation of China Shanghai China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China Shanghai Jiao Tong University College of Smart Energy Shanghai China

ISBN: (纸本)9798350309638

Under the current inter-provincial tie-line power assessment mechanism in China, regional power grids typically return assessment fees to each province based on their relative tie-line and frequency control performance. However, under this return method, if all provinces in a regional grid perform poorly in frequency regulation capacity, the returned control performance standard (CPS) fines for each province will be close, resulting in a lower penalty for power and frequency over-limit violations on provincial grid interconnections. To simulate and compare the decision-making of provincial dispatch and control centers regarding automatic generation control (AGC) adjustable capacity under different CPS assessment fee return methods, this article proposes a two-province game model. In this model, the two provinces follow best response dynamics for alternating frequency regulation simulation and scheduling optimization until a balance is reached or the variation in reserve capacity is within a certain range. Testing different combinations of assessment prices and return methods, the results show that determining and announcing the provinces to receive fine returns based on their ranking in assessed electricity quantity can better motivate provinces to improve frequency regulation performance. © 2024 IEEE.

关键词： Decision making

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A quantitative evaluation method for the performance of primary frequency regulation of system resources

A quantitative evaluation method for the performance of prim...

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International Conference on Electronics Technology (ICET)

作者： Wu Xuelian Liu Fusuo Huang Hui Zhang Hongli Li Wei Power Grid Analysis and Consulting Department NARI Group Corporation/State Grid Electric Power Research Institute Nanjing China State Key Laboratory of Smart Grid Protection and control NARI Group Corporation/ State Grid Electric Power Research Institute Nanjing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

With large scale new energy power being connected to the grid, the frequency support capability of the system decreases gradually. In order to meet the regulation requirements of system frequency stability and lay the foundation for frequency stability coordination and optimization control, it is necessary to use reasonable quantitative evaluation indicators for primary frequency regulation performance. Firstly, the dynamic response characteristics of frequency modulation resources in load fluctuation scenarios and large power disturbance scenarios are analyzed separately. Then, by mastering the frequency response characteristics of the system considering primary frequency regulation in different scenarios, the key factors affecting the safety and stability characteristics of the system frequency are determined. Finally, a quantitative evaluation method for the primary frequency regulation performance of frequency modulation resources is proposed, and the applicability of the proposed evaluation method is verified based on typical scenario examples.

关键词： Performance evaluation Frequency modulation Power system dynamics Power system stability Stability analysis Regulation Power grids

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A Cost-Oriented Score Evaluation Index to Align Probabilistic Forecasting and Uncertain Decision-Making in Power Systems

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IEEE Transactions on Power Systems 2025年第2期40卷 1981-1984页

作者： Yan, Xinyue Zhang, Haipeng Li, Ran Wan, Can Nengling, Tai Sun, Yongchao Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai200240 China Shanghai Jiao Tong University College of Smart Energy Shanghai200240 China Ministry of Education Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai200240 China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai200240 China Zhejiang University College of Electrical Engineering Hangzhou310027 China Southwest Branch of State Grid Corporation of China Chengdu610095 China

Existing research has shown the inconsistency between point forecasting and deterministic optimization, yet the consistency between probabilistic forecast indices and uncertain optimization has not been investigated. This letter fills this gap by undertaking scenario-based tests to reveal the mismatch and proposing a new cost-oriented score (COS) to indicate whether a probabilistic forecast can lead to a "better"decision-making performance in unit commitment and economic dispatch. © 1969-2012 IEEE.

关键词： Costs Probabilistic logic Forecasting Uncertainty Decision making Standards Indexes Optimization Predictive models Real-time systems

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Effects of Pre-crosslinking on the Aggregate Structure and Space Charge Properties of XLPE 4

Effects of Pre-crosslinking on the Aggregate Structure and S...

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4th IEEE International Conference on Dielectrics, ICD 2022

作者： Wu, Y. Du, B.X. Li, Z.L. Dong, Y.M. Wang, H.Y. Liu, H. Zhang, Z.P. Fu, C. Meng, S.X. Peng, C. Tianjin University Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin300072 China China Electric Power Research Institute State Key Laboratory of Power Grid Environmental Protection Wuhan430073 China

ISBN: (数字)9781665418331

ISBN: (纸本)9781665418331

In the extrusion process of cross-linked polyethylene (XLPE) cables, when the local extrusion temperature is higher than the decomposition temperature of the cross-linking agent, the cross-linking agent will be thermally decomposed in advance, resulting in a low degree of pre-crosslinking of the material. In order to study the effect of pre-crosslinking on the space charge characteristics of XLPE DC cable materials, this paper carried out low-level pre-crosslinking treatment at different temperatures before the high-temperature cross-linking of the material. The aggregate structure of the material was characterized by means of scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and cross-linking degree test, and the space charge characteristics at different temperatures were studied. The experimental results show that pre-crosslinking will reduce the crosslinking degree of XLPE on the one hand, and also lead to the decrease of crystallinity and the reduction of spherulite size. The changes of the aggregate structure make it easier to inject the homopolar charges in pre-crosslinked XLPE samples. Under the high temperature, the residual impurity molecules in the sample will also dissociate, generating a large number of the heteropolar charges, resulting the occurrence of severe electric field distortion. © 2022 IEEE.

关键词： Differential scanning calorimetry

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Evaluation Methods for the Degree of Interaction and Coupling between New Energy and DC

Evaluation Methods for the Degree of Interaction and Couplin...

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International Conference on Electronics Technology (ICET)

作者： Wu Xuelian Liu Fusuo Li Zhaowei Zhang Hongli Lai Yening Power Grid Analysis and Consulting Department NARI Group Corporation/State grid electric power research institute Nanjing China State Key Laboratory of Smart Grid Protection and control NARI Group Corporation/ State grid electric power research institute Nanjing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

The high proportion of new energy connected to multi-infeed direct current power system may cause large-scale new energy to enter low voltage ride-through and multiple DC commutation failures under severe grounding faults, and the interactive coupling effect may affect the subsequent recovery process. In response to this phenomenon, interactive indicators are proposed to evaluate the risk of simultaneous faults between DC and new energy during grounding faults, as well as coupling indicators to evaluate the risk of secondary faults during the recovery process of DC and new energy after grounding faults are cleared. Simulation analysis based on actual power grids shows that this indicator can evaluate the interactive coupling process between new energy low voltage ride-through and DC commutation failure intuitively.

关键词： Couplings Low voltage Time-frequency analysis Grounding Electric shock Voltage Power system stability

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Life Prediction Method of Equipment System Based on SVR-Wiener

Life Prediction Method of Equipment System Based on SVR-Wien...

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2021 IEEE International Conference on Sensing, Diagnostics, Prognostics, and control, SDPC 2021

作者： Yan, Bingrong Su, Yan Wang, Jinjun Wen, Tan State Key Laboratory of Smart Grid Protection and Control Nanjing China Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China Civil Aviation College Nanjing University of Aeronautics and Astronautics Nanjing China

ISBN: (纸本)9781665449762

Aiming at tlie cliaracteristics of liigli reliability, long-life equipment or newly developed equipment with a small number of failure degradation data samples, this paper proposes a method for predicting the remaining useful life of equipment systems based on the fusion of support vector regression (SVR) and drift Wiener process. Firstly, the distribution function of the drift Wiener process is transformed;then, a support vector regression machine method is introduced to establish an optimization model to estimate the parameters of the drift Wiener process, and a life prediction algorithm based on SVR and drift Wiener process is researched and established. Finally, a certain highly reliable and long-life cabin environment system is used as an example to carry out life prediction. The application shows that the method proposed in this paper has better prediction than the traditional maximum likelihood estimation method and moment estimation method in a small sample. © 2021 IEEE.

关键词： Forecasting

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Mobile Energy Storage System Fleets Participated Active Distribution Network Restoration Model 37th

Mobile Energy Storage System Fleets Participated Active Dist...

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37th Annual Conference on Power System and Automation in Chinese Universities, CUS-EPSA 2022

作者： Meng, Na Wu, Han Sun, Liwen State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing21000 China Smart Grid Research Institute Nanjing Institute of Technology Nanjing211167 China

ISBN: (纸本)9789819914388

This letter proposes a novel coordinated network reconfiguration and mobile energy storage system (MESS) fleets dispatching model considering the uncertainty in DG output and load forecasts to increase the resilience of the active distribution network (ADN) after disasters. The MESS traveling strategy is modeled by an extended transit delay model. Then, a novel deterministic network restoration model incorporating the MESS, stationary energy storage system, distributed generation (DG), demand response (DR) and network reconfiguration is proposed and programmed using mixed integer linear programming. Then, an ellipsoidal uncertainty set is employed to describe the uncertainty of load and DG output forecasts and a robust network restoration model proposed based on the deterministic one. The proposed deterministic and robust network restoration models are verified on a 59-bus rural distribution system in China. © 2023, state grid Electric Power.

关键词： Energy storage

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