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Transient Voltage Stability Assessment Method based on gcForest

Journal of Physics: Conference Series 2021年第1期1914卷

作者： Sun Zhiyuan LI Mingpo Zhang Jie Hu Binjiang Qi Guo Zhu Yihua Guangxi Power Grid Electrical Power Research Institute Supported by the Science and Technology Project of Guangxi Power Grid (Contract No(***DL00006)). State Key Laboratory of HVDC Electric Power Research Institute CSG China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory of Power System Simulation

Aiming at the fact that the traditional method cannot quickly and accurately judge the power system transient voltage stability, and the deep neural network method needs many sample data sets and has a large number of hyperparameters, a power system transient voltage stability assessment method based on deep forest (gcForest) is proposed. gcForest effectively extracts features through ensemble learning, multi-layer feature transformation, and dynamically adjusting the number of model layers. Finally, this method is applied to transient voltage stability assessment of an electrolytic aluminium load-intensive area in Guangxi power Grid. The results show that the method has high accuracy, the feasibility and effectiveness of this method are verified. This method can assist dispatchers to judge the transient voltage stability of the power grid.

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Redesigning electrification of China’s ammonia and methanol industry to balance decarbonization with power system security

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Nature Energy 2025年 1-12页

作者： Jiarong Li Jin Lin Sirui Wu Zhipeng Yu Chris P. Nielsen Michael B. McElroy Jianxiao Wang Jie Song Xi Lu Yonghua Song Xuefeng Lyu Mingkai Yu Department of Electrical Engineering Tsinghua University Beijing China Harvard-China Project on Energy Economy and Environment Harvard University Cambridge MA USA State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing China Department of Industrial Engineering and Management College of Engineering Peking University Beijing China State Key Laboratory of Regional Environment and Sustainability School of Environment Tsinghua University Beijing China Institute for Carbon Neutrality Tsinghua University Beijing China State Key Laboratory of Internet of Things for Smart City University of Macau Macau China School of Nuclear Science and Engineering North China Electric Power University Beijing China China Electric Power Research Institute Beijing China

Electrification represents a critical pathway to decarbonize the ammonia and methanol industries by reducing fossil fuel reliance. However, a greater understanding is needed of how the spatio-temporal mismatch between renewable generation and chemical load patterns may impact on power system emissions and security. Here we assess different electrification pathways across 22 Chinese provinces from 2020 to 2050. Using 2020 data, we show that reliance on grid electricity offsets CO2reductions by increasing power system emissions, raising national emissions by 1%. Integrating co-located renewables without self-balancing flexibility exacerbates power system security risks, potentially increasing balancing requirements by 9%. To address this challenge, we propose the ‘Green Flexible Chemical Electrification’ pathway, transitioning from requirements for stringent co-located renewables to rigid temporal self flexibility. By 2030, Green Flexible Chemical Electrification demonstrates cost competitiveness nationwide, with green ammonia potentially generating 2 billion RMB in profit. Additionally, redesigning electricity pricing to incentivize chemical-side demand management further enhances power–chemical synergies.

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Reliability Evaluation of DC Distribution Network Considering Uncertainty of Source-Load

Reliability Evaluation of DC Distribution Network Considerin...

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China International Electrical and Energy Conference (CIEEC)

作者： Yugang Guo Xiaoqing Han Dingkang Liang Xiao Chang Jun Zhao Shengwen Li Rui Fan Min Zhang Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology State Grid Shanxi Electric Power Research Institute State Grid Shanxi Electric Power Research Institute Taiyuan China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

In view of power generation and consumption of DC distribution network in the future, a comprehensive analysis means for reliability of DC system considering generation and load uncertainty, grid topology and equipment factors is proposed. For the DC distribution network grid-connected and islanded operation modes, the distribution system fault rate and repair rate of each load point of the DC distribution system under the grid-connected operation mode are calculated based on the network equivalent method. During the islanded operation, the adequacy transition rate parameter reflecting the uncertainty of power and load, the distributed generation mechanical operation parameter and the starting and switching parameter of islanded system were calculated. Finally, the two operating modes are integrated, and the Markov was used to calculate the reliability index of the network for the modified IEEE-RBTS BUS6 example. The accuracy and effectiveness of the method is proven and considered as a reference for research on reliability evaluation of DC distribution network .

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Research on Calculation Method of Two-Dimensiona Dual-Limit Speed Safety Protection Curve for High Speed Maglev

Research on Calculation Method of Two-Dimensiona Dual-Limit ...

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International Conference on Electromechanical control Technology and Transportation (ICECTT)

作者： Jiakun Wen Lianchuan Ma Kaicheng Li Qiang Fu Lei Yuan School of Electronic and Information Engineering Beijing Jiaotong University Beijing China National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China State Key Lab of Rail Traffic Control & Safety Beijing Jiaotong University Beijing China

ISBN: (数字)9781728199283

ISBN: (纸本)9781728199290

Determining the safety protection curve of the high-speed maglev train is the first problem to be solved by the high-speed maglev operation control system. The ground-based calculation of the safety protection curve for the high-speed maglev at the speed of 600km/h obviously cannot meet its design requirements. Therefore, this paper proposes an active calculation method of the safety protection curve, establishes a kinematic model of a high-speed maglev train, and combines the characteristics of high-speed maglev two-dimensional protection to give a calculation method of its safety protection curve. Finally, a practical example is used to verify the safety protection performance of the high-speed maglev train based on the calculation method. The results show that the vehicle-based two-dimensional dual-speed safety curve calculation method proposed in this paper can improve the safety of maglve operation without reducing the operating efficiency.

关键词： Magnetic levitation vehicles Safety Resistance Eddy currents Force Friction Transportation

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Wind farm active voltage regulation strategy of transient support improvement 8

Wind farm active voltage regulation strategy of transient su...

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8th Renewable power Generation Conference, RPG 2019

作者： Yang, Cui Peng, Song Xuekun, Cheng Ying, Qiao Xiaosheng, Wang Jingbo, Liu State Grid Jibei Electric Power Co.Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Xicheng District Beijing China Grid-connected Operation Technology Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Xicheng District Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Dept. of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The cumulative installed capacity of wind power worldwide has grown rapidly in recent years. Fixed reactive power control is adopted by wind turbines (WTs) to receive cycle instruction of wind farm (WF) automatic voltage control system (AVCS). It does not have active voltage regulation (AVR) capability, which reduces the reliability of power system operation. Firstly, two ways of WTs AVR which QV droop control and Vac control mode are introduced in this paper. On the basis, the problems of reactive power circulation and control points inconsistency during multiWTs voltage regulation are discussed. The problems are solved by coordination of WTs of WF AVR strategy. WF voltage transient support capability is promoted by the strategy. Effectiveness is verified by simulation case of the proposed method. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Reactive power

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Review on Pumped Storage power Station in High Proportion Renewable Energy power system

Review on Pumped Storage Power Station in High Proportion Re...

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IEEE Student Conference on Electric Machines and systems

作者： Bingxin Sun Shuping Tian Jiang He Liande Liu Zhiqiang Wang Jiawei Guo Fei Xu Te Cheng Junhui Li Inner Mongolia Hohhot Pumped-Storage Power Generation Co LTD Hohhot China State Key Lab of Power Systems Tsinghua University Beijing China Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Powe University) Jilin China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

Large scale renewable energy, represented by wind power and photovoltaic power, has brought many problems for the safe and stable operation of power system. Firstly, this paper analyzes the main problems brought by large-scale wind power and photovoltaic power integration into the power system. Secondly, the paper introduces the basic principle and engineering construction of pumped storage power station. Thirdly, the paper expounds in detail the current application of pumped storage power station in power system, and finally points out the main problems faced by the development of Pumped Storage power Station and the development trend, so as to provide reference for the construction and operation of pumped storage power station.

关键词： Photovoltaic systems Renewable energy sources Conferences Pumps Wind power generation Market research power systems

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Analysis of fatigue life loss of drivetrain of doubly-fed wind turbines under short-circuit fault of power grid 8

Analysis of fatigue life loss of drivetrain of doubly-fed wi...

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8th Renewable power Generation Conference, RPG 2019

作者： Shilong, Qiu Hui, Li Lijiao, Gong Bin, Wang Zhaoseng, Chai You, Wu Department of Mechanical and Electrical Engineering Shihezi University Shihezi China State Key Laboratory of Power Drivetrain Equipment and System Security Chongqing University Chongqing China State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Haidian District Beijing China

ISBN: (纸本)9781839531255

The shafting drivetrain of the doubly fed wind turbine is the part with the highest failure rate. The electromagnetic torque fluctuation caused by the grid fault easily results in the torsional vibration fatigue loss of the shaft. Accordingly, the influences of drivetrain fatigue life loss under different grid faults require investigation. Firstly, the four-mass model of the drivetrain is constructed on the basis of MATlab/Simuhnk. Secondly, the electromagnetic torque response under short-circuit fault of the grid is obtained via model simulation. Finally, the effects of different types of grid faults on the fatigue life of the drivetrain are analysed through Mlife. Results show that the electromagnetic torque fluctuation load generated by grid fault has no apparent influence on the fatigue life of the drivetrain in the short term. but the cumulative effect of short-term damage will aggravate the fatigue life loss of the drivetrain and increase the failure risk of the component. The electromagnetic torque generated by the three-phase symmetrical short-circuit is the most violent and has the maximum effect on the fatigue life of the drivetrain. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Timing circuits

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An Improved Jiles-Atherton Model for DC Bias of Transformer

An Improved Jiles-Atherton Model for DC Bias of Transformer

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China International Electrical and Energy Conference (CIEEC)

作者： Huipeng Li Yizhao Liu Shifeng Zhang Ying Xiao Jinhao Wang Leyan Tantai State Grid Shanxi Electric Power Company Shanxi Electric Power Research Institute Taiyuan China Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

The Jiles-Atherton (J-A) theory is widely used in the field of semi-macro hysteresis modeling. However, the DC bias transformer model based on presented J-A theory has a big deviation due to only existence of AC component and the description of the hysteresis curve is incomplete in the biased state. Firstly, this article makes a revision to the J-A formula under normal excitation state. Moreover, through innovative introduction of DC component to improve non-hysteresis magnetization curve and differential expression of magnetization of J-A theory under DC bias state, and the pinning coefficient k is modified to establish a numerical simulation model. By verfied, the improved J-A model can describe the magnetization characteristics of ferromagnetic materials in the biased state better. Then, based on the improved J-A formula proposed a transformer DC bias iterative model. Finally, a transformer in a 500 kV grid is used to verify the accuracy of transformer DC bias model based on the improved J-A formula.

关键词： J-A theory DC bias magnetism improved model hysteresis curve modeling hysteresis curve DC bias Transformer Modeling V-A THEORY AC component DC component

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Research on collaborative frequency regulation control strategy of wind farm based on decentralized exit 8

Research on collaborative frequency regulation control strat...

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8th Renewable power Generation Conference, RPG 2019

作者： Ren, Y.H. Song, P. Wang, X.S. Shi, R.F. School of Control and Computer Engineering North China Electric Power University Beijing102206 China State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co.Ltd. Beijing100045 China Grid-connected Operation Technology for Wind-Solar Storage Hybrid System State Grid Corporation Key Laboratory Beijing100045 China

ISBN: (纸本)9781839531255

When the wind turbine adopts the rotor inertia control to participate in grid frequency regulation, it is easy to cause the second frequency drop, which will be more serious when applied to the wind farm. To solve this problem, the influence of wind speed on the unit's ultimate support time under the constant power support mode is analyzed quantitatively and wind turbine recovery time is defined. The functional relationship between the unit's support time and recovery time suitable for engineering application is given. A wind farm frequency regulation optimization model aiming at the longest supporting time of all units in the whole station is established, and the wind farm coordinated frequency regulation control strategy based on decentralized exit is proposed, taking full account of capacity differences of units under different working conditions. Simulation examples show that the real-time coordination of the exit of the wind turbine frequency regulation can effectively alleviate the secondary frequency drop problem of a wind farm. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Wind turbines

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A Three-Loop control Mehod for DC Solid state Transformer

A Three-Loop Control Mehod for DC Solid State Transformer

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International Conference on power Electronics and Drive systems (PEDS)

作者： Shengwen Li Xiangqi Meng Xiaoqing Han Peng Wang Yanbing Jia Chunguang Ren Shanxi Electric Power Research Institute Taiyuan China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

Aiming at the poor dynamic performance of DC solid transformer with dual-loop control, a three-loop control method is proposed for the DC transformer to improve the system dynamic performance. The proposed control method is implemented by introducing an output current loop to the traditional dual-loop control system. Simulation results show the effective of the proposed method.

关键词： Voltage control control systems power system dynamics Solids Mathematical model Impedance

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