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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Lu, Bin Xu, Xi Yu, Zhipeng Wang, Wen Gu, Xuenan NARI Group Corporation State Grid Electric Power Research Institute China NARI Technology Co. Ltd. China State Key Laboratory of Smart Grid Protection and Control China Southeast University Nanjing China

ISBN: (纸本)9781728135205

In order to solve the practical problem of 24-hours dynamic reactive power optimization in power system dispatching, according to the limit output range of generator's operation, this paper divides generator's operation into three regions in PQ mathematical model and takes the action times of discrete control equipment as global inequality constraints, finally establishes a complete 24-hours non-linear mixed integer dynamic reactive power optimization mathematical model. The simulation results show that the mathematical model in this paper can adjust the output of the generators according to the actual situation effectively when the generators are in phase-leading operation. In addition, dynamic reactive power optimization reduces the number of control equipment's action at the cost of increasing active power loss in the whole network. So, In order to ensure the safe and economic operation of power grid, it is necessary to coordinate the relationship between active power loss and the constraints of control equipment's action. This paper has positive reference significance for power system dispatching. © 2019 IEEE.

关键词： Electric power transmission networks

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Compact Valve Hall Layout of DC Transformer for Offshore Wind Farm All-DC Collection Platform 7

Compact Valve Hall Layout of DC Transformer for Offshore Win...

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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Huang, Junwei Chao, Wujie Deng, Chaoping Dai, Liyu Wang, Jinke Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd. Fuzhou350007 China Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou350007 China

To solve the problems of high investment cost, difficulty in improving AC collection efficiency, and broadband resonance in flexible DC transmission of offshore wind power, researchers have proposed an all-DC collection system. To further optimize the economic efficiency of offshore wind farm engineering, this paper studies on the compact valve hall layout of DC transformer for offshore wind farm all-DC collection platforms. The minimum air clearance inside the valve hall was determined based on the insulation level of the DC transformer, and a compact valve hall layout plan for the DC transformer was proposed, taking into account factors such as the electrical main wiring scheme, weight distribution, and symmetrical balance. The proposed compact valve hall layout scheme for DC transformers can reduce the volume of offshore all-DC collection platforms, save engineering construction costs, and improve the efficiency of offshore wind farms. This article can provide reference and guidance for subsequent research on all-DC collection and economic transmission of large-scale offshore wind farms. © Published under licence by IOP Publishing Ltd.

关键词： Offshore wind farms

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Thermal simulation optimization of DC charger based on ANSYS Icepak 14

Thermal simulation optimization of DC charger based on ANSYS...

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： Wang, Yu Zhou, Feiyu Wen, Tan Su, Yan Yuan, Li Wang, Ke State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China Nanjing University of Aeronautics and Astronautics College of Civil Aviation Nanjing China State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9798350301359

As one of the most important charging facilities for electric vehicles, DC chargers provide power supplements for electric vehicles. With the continuous development of DC chargers, the power density of their internal functional modules is also increasing. It is urgent to choose a reasonable heat dissipation method to reduce the overall temperature rise inside the DC charger and ensure its safe operation. In this paper, the 80kW DC charger is taken as the research object, and based on ANSYS Icepak thermal simulation software, the internal temperature field and fluid field of the DC charger are simulated and analyzed, and the design scheme of the DC charger is optimized by studying the heat dissipation system. Finally, the optimization scheme of the air duct structure of the system is obtained by adjusting the position of the heat dissipation fan. © 2023 IEEE.

关键词： ANSYS Icepak DC charger heat dissipation temperature thermal simulation

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A Novel Method of Power Swing Blocking in Impedance Relay 8

A Novel Method of Power Swing Blocking in Impedance Relay

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8th IEEE International Conference on Advanced Power system Automation and protection, APAP 2019

作者： Wang, Hao Kang, Xiaoning Dong, Xinzhou Xi'an Jiaotong University Shaanxi Key Laboratory of Smart Grid Xi'an China Tsinghua University State Key Laboratory of Control and Simulation Power System and Generation Equipment Beijing China

ISBN: (纸本)9781728117225

Distance protection is widely applied in High/Ultra- High Voltage AC transmission system. Impedance relay, the core element of distance protection, may operate incorrectly under power swing, so a power swing blocking unit is needed in distance protection. In this paper, the phase difference between the measurement voltage and compensation voltage under power swing and line fault is analyzed. Based on the analysis, a power swing blocking strategy using the change rate of phase difference between measurement voltage and compensation voltage is proposed. Simulation results in PSCAD/EMTDC indicate that the proposed strategy can block the impedance relay reliably under power swing and unblock the impedance relay after detecting the fault under power swing. © 2019 IEEE.

关键词： Electric power system protection

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A strategy for avoiding overload of AC line after blocking dc line in AC/DC hybrid grid 15

A strategy for avoiding overload of AC line after blocking d...

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15th International Conference on Developments in Power system protection, DPSP 2020

作者： Wang, Hao Kang, Xiaoning Dong, Xinzhou Shaanxi Key Laboratory of Smart Grid Xi'an Jiaotong University Xi'an China State Key Laboratory of Control and Simulation Power System and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781713827894

The development of DC transmission technique is prompting the development of AC/DC hybrid grid. As a new form of the grid, AC/DC hybrid grid faces many challenges one of which is the effect of DC blocking on AC lines. This paper analyses the influence of DC blocking on AC lines. Based on the analysis, a control strategy using wide area information is proposed to avoid the severe overload of AC line after blocking a DC line. The proposed strategy increases the transmission power of normally operating DC line aiming to afford part or all of the transmission task of the blocked DC line. The test result obtained from simulation indicates that the proposed strategy can reduce the overload of AC line after blocking a DC line. © 2020 IET Conference Publications.

关键词： Transmissions

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Research for MMC Topology of Power Conversion system and Test for control Performance Based on RTDS 4

Research for MMC Topology of Power Conversion System and Tes...

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4th International Conference on smart grid and Energy Internet, SGEI 2024

作者： Yang, Zaixin Jian, Xusheng Liu, Xiaokai Liu, Feng Inner Mongolia Key Laboratory of Smart Grid of New-type Power System Institute of Relay Protection Inner Mongolia Electric Power Science & Research Institute Hohhot China

ISBN: (纸本)9798350368314

With the widespread application of PCSs in power system for large-scale new energy, it is of great significance to study the new topology structure and control strategy of power conversion system (PCS). In this paper, a MMC topology of PCS is studied and MMC digital model is established. The control strategy is proposed to enable PCS to operate continuously for 10 minutes under 0.2 pu. grid voltage. Therefore, a novel RTDS for PCS controller testing platform is established. Power control testing, frequency response testing, and voltage ride through testing of the actual hardware of PCS controller is completed. The correctness and effectiveness of the control strategy of the new hybrid energy storage multifunctional controller is verified. ©2024 IEEE.

关键词： Electric power system control

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Source-Load Joint Probability Prediction Based on Transformer Model 5

Source-Load Joint Probability Prediction Based on Transforme...

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5th IEEE International Conference on Artificial Intelligence and Big Data, ICAIBD 2022

作者： Hu, Pingzhao Shan, Xin Hu, Diangang Fu, Jiayu Wang, Chen Zhang, Kaifeng Southeast University Key Laboratory of Measurement and Control of Cse Ministry of Education Nanjing China Co. Ltd. State Grid Nari Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China State Grid Gansu Electric Power Co. Ltd. Gansu China

ISBN: (纸本)9781665499132

Renewable energy power generation prediction, including wind and photovoltaic power prediction, is usually performed separately from load prediction, while there are significant internal relationships between renewable energy power generation and load consumption. Therefore, exploring the relationship between source and load, and implementing sourceload joint prediction may improve the accuracy of source-load prediction simultaneously. This paper proposes a source-load joint probability prediction method, PCMDT (Probability-CNN-Multi-Decoder-Transformer), based on Transformer model. Firstly, we analyzed the possible aspects of the relationship between renewable energy and load. Then the CMDT(CNN-Multi-Decoder-Transformer) model was used to realize the point prediction of renewable energy power generation and load power. Next, the conditional quantile was obtained by optimizing the quantile loss function (Pinball Loss) to realize the joint probability prediction of source and load. Finally, the model was tested on a public state-level dataset. Comparing the results of source-load joint prediction with non-joint prediction, the proposed model can improve the accuracy of renewable energy and load prediction. © 2022 IEEE.

关键词： Forecasting

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Event-triggered-based self-organizing fuzzy neural network control for the municipal solid waste incineration process

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Science China(Technological Sciences) 2023年第4期66卷 1096-1109页

作者： HE HaiJun MENG Xi TANG Jian QIAO JunFei Faculty of Information Technology Beijing University of TechnologyBejing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Bejing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Bejing 100124China Xi'an Institute of Electromechanical Information Technology Xi'an 710065China

Due to the large uncertainty in the municipal solid waste incineration(MSWI)process,the furnace temperature of the MSWI process is difficult to control and the controller is updated *** improve the accuracy and reduce the number of controller updates,a novel event-triggered control method based correntropy self-organizing TS fuzzy neural network(ETCSTSFNN)is ***,the neurons of the rule layer are grown or pruned adaptively based on activation intensity and control error to meet the dynamic change of the actual operating ***,the performance index is designed based on the correntropy of tracking errors,and the parameters of the controller are adjusted by gradient descent ***,a fixed threshold event-triggered condition is designed to determine whether the current controller is updated or *** stability of the control system is proved based on the Lyapunov stability ***,the furnace temperature control experiments are conducted based on the actual data of a municipal solid waste incineration plant in *** experimental results show that the proposed ET-CSTSFNN controller shows a better control performance,which can reduce the number of the controller update significantly while achieving accurate furnace temperature control compared with other traditional control methods.

关键词： municipal solid waste incineration furnace temperature fuzzy control event-triggered

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Fast Fault protection Design and control of DC Trnasformer

Fast Fault Protection Design and Control of DC Trnasformer

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Wang, Guoning Wang, Zhigang Zeng, Xiaoming Wang, Yongwei Ge, Weimei State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation State Grid Electric Power Reasearch Insitute Nanjing China State Grid Xinyuan Company Shandong TaIshan Pumped Storage Power Station Co. Ltd Tai'an China

ISBN: (纸本)9781665414395

With the diversification of loads and the development of distributed energy, DC system and DC transformer attracted more and more attention in modern power system. However, bipolar short-circuit faults threatened the safety of DC power system operation due to the surge current caused by them. When DC transformer low voltage output has short circuit fault, it must block fault current quickly. This paper proposed a fault protection control method in DC transformer. Through the design and control, the fault current can be quickly blocked, and the fault current output can be maintained to support the rapid recovery of the system. After adding the fault protection circuit and control in DC transformer, the protection performance is greatly improved. Finally, the real-time simulation of RTDS verifies that the proposed short-circuit protection current-limiting control can well achieve the design goals. © 2021 IEEE.

关键词： DC transformers

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A Coordinated MMC control Strategy of Integrated Photovoltaic/Battery system 7

A Coordinated MMC Control Strategy of Integrated Photovoltai...

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7th IEEE International Conference on Energy Internet, ICEI 2023

作者： Yang, Yuexi Zhou, Xiao Wang, Sichao Li, Chunpeng Huang, Junwei Xu, Wenzheng State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Fujian Electric Power Research Institute Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou China National Research Center for Active Distribution Network Technology Beijing Jiaotong University Beijing China

ISBN: (纸本)9798350386684

The grid-connecting control and maximum power point tracking control of photovoltaic inverters have long been the research focus in the field of solar power generation. In this paper, a new coordinated modular multilevel converter (MMC) control strategy based on virtual synchronization and MPPT is proposed for grid-connected inverters in the PV/Battery system. The proposed strategy realizes frequency and voltage droop control with the synchro's inertia and damping characteristics, and improves the power angle stability as well as system voltage stability. Simulation results in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed control strategy. © 2023 IEEE.

关键词： Solar energy

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