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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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Energy Supply System of HVdc Equipment Based on Symmetric Capacitors Coupling

Energy Supply System of HVDC Equipment Based on Symmetric Ca...

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IEEE Electronic Power grid (egrid)

作者： Yang Gao Hui Pang Dong Liu Zhiyuan He Chong Gao Chang Lin State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Ltd. Changping District Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Ltd. Changping District Beijing China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

In order to solve the problem of power supply for control drivers of HVdc transmission equipment, a novel energy supply system for HVdc equipment is proposed based on capacitor dc isolation characteristic and inductance-capacitance series resonance principle, which realizes efficient transmission from ground-potential side power supply to high-potential side power supply. In this paper, the working principle of the proposed energy supply system is analyzed, and a parameter design for the topology is carried out. The simulation results of the specific examples are verified by the PSIM simulation software, which verifies the correctness and effectiveness of the proposed energy supply system.

关键词： Power supplies Capacitors Electric potential HVdc transmission RLC circuits Inductance Circuit breakers

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Investigation on Insulating Properties of Epoxy Resin Impregnated Paper Affected by Curing Agents and Accelerator Contents

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Teng, Chenyuan Ding, Yichao Zhou, Yuanxiang Zhao, Lei Zhang, Yunxiao Chen, Haoran Zhang, Youbing Zhejiang University of Technology College of Information Engineering Hangzhou310023 China Nankai University China and College of Electronic Information and Optical Engineering Tianjin300350 China Zhejiang Testing & Inspection Institute for Mechanical and Electrical Products Quality Co. Ltd Hangzhou310051 China Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing100084 China State Grid Xinxiang Electric Power Supply Company Xinxiang453002 China

The curing formula is vital to the performance of epoxy resin impregnated paper (RIP) material. This work explored the effect of curing agents and accelerator contents on the thermal and electrical properties of RIP material. It was found that the RIP material cured with 1phr accelerator has the optimal glass transition temperature, electrical conductivity, dielectric loss and dc breakdown strength compared with RIP material cured by 0.5phr, 2phr, and 3phr accelerator. The RIP material cured with MEHHPA has better thermal and insulating properties compared with the RIP material cured with METHPA. The existence of the crepe paper amplifies the influence of accelerator and curing agent for the hydroxyl groups affect the curing process as well as the chain segment arrangement. This study provides the research support for the design of the curing formula for RIP insulation used in dc bushing. © 1994-2012 IEEE.

关键词： Dielectric losses

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A Method to Create Training Dataset for Dehazing with Cyclegan

A Method to Create Training Dataset for Dehazing with Cycleg...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Hui Zhang Fan Mou Shangqi Duan Shuangde Huang Shengwei Wang Debin Xu Zezhong Zheng Kunming Power Supply Bureau of Yunnan Power Grid Co. Ltd. Kunming Yunnan PRC School of Resources and Environment University of Electronic Science and Technology of China Chengdu Sichuan PRC Key Laboratory of Urban Land Resources Monitoring and Simulation Ministry of Land and Resources Shenzhen Guangdong PRC State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan Hubei PRC State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences Beijing PRC Guangxi Key Laboratory for Spatial Information and Geomatics Guilin University of Technology Guilin Guangxi PRC

ISBN: (数字)9781728163741

ISBN: (纸本)9781728163758

Haze usually blurs the characteristics of images shotted in adverse weather conditions. It brings many challenges for computer vision such as object detection. Due to the lack of effective training dataset of remote sensing image, the dehazing usually utilize the physical model rather than the deep learning approach based on a large number of training dataset. An effective method to create training dataset may provide some new ideas for remote sensing image dehazing. In this paper, a novel approach based on the visual features rather than the physical counterparts is developed to create a training dataset for remote sensing images dehazing. Firstly, 400 haze images and 400 clear images with size of 240×240 pixels were gathered from Landsat 8. Secondly, the dataset was utilized to train the cycle-consistent generative adversarial network (CycleGAN) to derive an image transform model which can convert a clear image into a haze one. Thirdly, 4000 clear images with size of 240×240 pixels were collected from Landsat 8 and the images were transformed into the haze images with our model. Finally, the ratio of training dataset and testing dataset is set as 4:1. The haze images created by us were selected as the input and the original clear images were chosen as the output to train the convolutional neural networks to derive the dehazing models. The created dataset and the dehazing models derived were tested, and the experimental results showed that our approach is better to keep the brightnessinformation of the original image, but it is not good at keeping the chroma information.

关键词： Atmospheric modeling Training Remote sensing Scattering Testing Transforms Generative adversarial networks

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Impedance-Based Modeling and Analysis of Stabilization Control for MMC-HVdc

Impedance-Based Modeling and Analysis of Stabilization Contr...

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HVdc (HVdc), International Conference on

作者： Taiyuan Yin Yue Wang Xiaolei Wang Xuan Li Ying Xu Pengkun Li State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University Xi'an China School of Electronic and Information Engineering Zhongyuan University of Technology Zhengzhou China DC Technical Consulting Center State Grid Economic and Technological Research Institute Co. Ltd. Beijing China

ISBN: (数字)9781728175935

ISBN: (纸本)9781728175942

Oscillationphenomenon has been reported in modular multilevel converter-based high-voltage dc (MMC-HVdc) transmission system. Many methods have been proposed to suppress the oscillation and improve the system stability, however, few papers have analyzed the influence of stabilization control on MMC impedance analytically. Impedance model of MMC considering additional stabilization control is derived in this paper. Based on this impedance model, the influence of stabilization control on MMC impedance are studied, and an optimal design method for controller parameters of the stabilization strategy is proposed to maximize the phase margin of the MMC-HVdc system. Furthermore, this paper points out that stabilization method based on oscillating voltage feedback is more effective than stabilization method based on oscillating current feedback, and the reason is analyzed. Finally, the above results are verified by simulation.

关键词： Impedance Gold Voltage control Analytical models Perturbation methods Phase locked loops Modulation

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Studies on Artificial Neural Network Based Wind Power grid-connected Harmonic Resonant Frequency Detection

Studies on Artificial Neural Network Based Wind Power Grid-c...

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IEEE Electronic Power grid (egrid)

作者： Dong Li Xueguang Wu Yang Gao Minxiao Han Dong Liu Chang Lin School of Electrical and Electronic Engineering North China Electric Power University Changping District Beijing China State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Ltd. Changping District Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Ltd. Changping District Beijing China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

With the wide utilization of wind resources, the penetration of wind power is ever increasing. Due to the influence of various uncertainties in the wind farm, the wind farm may generate harmonic oscillations randomly in the system. Accurate detection of the resonant frequency of the system is an important prerequisite for effective harmonic suppression. In response to the aforementioned issues, this paper proposes a wind power grid-connected harmonic resonant frequency measurement based on artificial neural network. It takes the instantaneous current values measured in a certain power frequency cycle as the model input, and uses the resonant frequency of the system as the model output. The accuracy and applicability of the proposed measurement method are verified by simulation studies in the MATLAB/Simulink. Results show that the detection method proposed in this paper is highly accurate and has the potential to be used in the wind farm.

关键词： Resonant frequency Artificial neural networks Harmonic analysis Wind power generation Neurons Wind farms Power system harmonics

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Change of Glacial Lake in Karakoram Range

Change of Glacial Lake in Karakoram Range

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Fan Mou Danyang Wang Jiaxi Liu Zezhong Zheng Liming Jiang Guoqing Zhou Fangrong Zhou School of Resources and Environment University of Electronic Science and Technology of China Chengdu Sichuan PRC Key Laboratory of Urban Land Resources Monitoring and Simulation Ministry of Land and Resources Shenzhen Guangdong PRC State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan Hubei PRC State Key Laboratory of Remote Sensing Science Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences Beijing PRC Guangxi Key Laboratory for Spatial Information and Geomatics Guilin University of Technology Guilin Guangxi PRC Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan Hubei PRC Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming Yunnan PRC

ISBN: (数字)9781728163741

ISBN: (纸本)9781728163758

Global warming results in the rapid melting of glacial lakes in the Himalayas. In this paper, we took the Karakoram range in the Himalayas as the study area, and we derived the glacial lake area in 2001, 2014, and 2017 with semantic segmentation algorithm. Firstly, five high-resolution images in Mount Lucania were collected from Google Earth. Secondly, each image was labelled, and 80000 training images with the size of 256×256 pixels were derived using augmentation approach. Thirdly, a model of the stacking network of U-Net and SegNet based on these training images to extract the glacial lake was trained. Then, another five images of Karakoram range were derived from Google Earth as a testing dataset to demonstrate the performance of training model. Finally, the glacial lakes were extracted from the images of Karakoram range in the same month in 2001, 2014 and 2017. Our result showed that the area of the glacial lake in Karakoram range increased rapidly from 2001 to 2014, but decreased from 2014 to 2017.

关键词： Lakes Training Image segmentation Earth Stacking Semantics Internet

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Wind farm active voltage regulation strategy of transient support improvement

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

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8th Renewable Power Generation Conference (RPG 2019)

作者： Cui Yang Song Peng Cheng Xuekun Qiao Ying Wang Xiaosheng Liu Jingbo 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 For 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: (数字)9781839531248

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 multi-WTs 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.

关键词：

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

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

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8th Renewable Power Generation Conference (RPG 2019)

作者： Bowen Yang Gangui Yan Xiaorong Xie Yanhui Wang Jian Tang Key Laboratory of Modern Power System Simulation and Control & 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: (数字)9781839531248

ISBN: (纸本)9781839531255

关键词：

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MMC-HVdc Testing and simulation Based on Physical simulation System

MMC-HVDC Testing and Simulation Based on Physical Simulation...

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IEEE Electronic Power grid (egrid)

作者： Dong Liu Xiangnan Hu Xuebing Zhai Hui Pang Bin Chang Xuanjun Zong State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China Global Energy Interconnection Research Institute Beijing China HVDC Simulation Center Global Energy Interconnection Research Institute Beijing China State Grid Jiangsu Electric Co. Ltd Economic Research Institute Nanjing China

ISBN: (数字)9781728157047

ISBN: (纸本)9781728157054

For the ever increasing power rating and voltage level of modular multilevel converter (MMC) based HVdc, it becomes more and more difficult for digital simulation system to reflect the energy fluctuation and control characteristic, as well as the valve based controller (VBC) full function testing. This paper developed a 200-level, 1200 sub-modules (SM) physical simulation system based on similarity theory for MMC-HVdc control and protection device test and project simulation. Taking the ±320kV/1000MW MMC-HVdc project in Xiamen, China as the study case, the control and protection device full-function test and project simulations are performed. An improved SM capacitor voltage balancing control is proposed for large-scale MMC-HVdc project. The physical simulation experiments and digital simulation results verify the correction of the proposed control strategy.

关键词： Valves Switches Testing HVdc transmission Capacitors Integral equations

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