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Reliability Evaluation and Optimization Design of dc Collection Based Large-Scale Offshore Wind Power Plants

Reliability Evaluation and Optimization Design of DC Collect...

引用

HVdc (HVdc), International Conference on

作者： Tingting Cheng Yijia Yuan Lanlan Ji Yuanzhen Li Pengfei Su Yali Liu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

dc collection based offshore wind power plants (WPPs) have received widespread attention due to their small platforms and high transmission efficiency. On the basis of analyzing the topologies and operation modes of dc collection systems, this paper proposes quantitative reliability evaluation indexes - capacity availability and expected lifecycle electric power income not supplied, and their calculation methods. Then, a gigawatt offshore WPP is designed based on a Chinese offshore WPP, and the impact of the main parameter design on equipment cost and reliability of the dc wind turbine is evaluated. Finally, an optimization design scheme for the main parameters is proposed to achieve economic operation of the power collection system.

关键词： Costs HVdc transmission Wind power generation Reliability engineering Wind turbines Power systems Topology Indexes Optimization

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Research on Impedance Scan Acceleration Method of VSC-HVdc grid-connected System 18

Research on Impedance Scan Acceleration Method of VSC-HVDC G...

引用

18th International Conference on AC and dc Power Transmission, ACdc 2022

作者： Gu, Huaiguang Wu, Yanan Zhang, Jian Zhou, Jiapei Kou, Longze Zhu, Lin State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. LTD. China Changping District Beijing102200 China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

This paper presents a acceleration frequency scan method of harmonic impedance for offshore wind farm system connected through VSC-HVdc. Based on the principle of linear orthogonality of Fourier decomposition, multiple harmonic voltage sources at equal intervals are injected into the PCC points of the system at the same time, and the simulated measured voltage and simulated measured current of the parallel points of the VSC-HVdc system are obtained, and then the harmonic impedance of the VSC-HVdc is obtained. Compared with the single harmonic source injected frequency scan, this method can shorten the scan time, greatly improve the harmonic impedance frequency scan efficiency, and ensure the accuracy of the scan results. Finally, this paper uses the electromagnetic transient simulation software PSCAD / EMTdc to build an offshore wind farm grid-connected system through VSC-HVdc, and carries out the harmonic impedance frequency scan simulation, compared with the harmonic impedance frequency scan results of single harmonic source, the Bode diagrams of the two are almost consistent, which proves the accuracy and feasibility of this method. © ACdc 2022. All rights reserved.

关键词： Offshore wind farms

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Abnormal data detection method of smart substation based on K-means-SVM 3

Abnormal data detection method of smart substation based on ...

引用

3rd International Conference on Electronics, Electrical and Information Engineering, ICEEIE 2023

作者： Zhai, Wei Wu, Yanping Qi, Bochao Xue, Tiantian Wu, Qing State Grid Tianjin information & telecommunication company Key Laboratory of Energy Big Data Simulation of Tianjin Enterprise Tianjin300143 China State Grid Tianjin Wuqing Electric Power Supply Company Tianjin301700 China State Grid Info & Telecom Co. Ltd Beijing China-Power Information Technology Co.Ltd Beijing102200 China

ISBN: (纸本)9781510671423

The safe operation of smart substation is an important guarantee to ensure the stability of power supply. Aiming at the problems of substation data anomaly identification caused by large amount of substation data, complex data and high dimension, an smart substation anomaly data detection method based on K-means-SVM is proposed in this paper. Firstly, the unlabeled substation data is transformed into labeled data by K-means method, and then the unsupervised classification results provided by K-means are used as the training data of SVM. After SVM training, use the trained plane to test the two types of data obtained by K-means clustering, use the accurate data predicted by SVM to retrain the SVM segmentation plane, and iteratively update the SVM segmentation plane according to this method until the error number of SVM prediction data is not changed. This method can effectively improve the accuracy and efficiency of substation abnormal data identification, so as to improve the operation and maintenance safety and equipment maintenance ability. © 2023 SPIE.

关键词： K-means clustering

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Investigation on the Effect of the Self-generated Metal Vapour on the Cathode Spot Formation in Vacuum Arc by Molecular Dynamics simulation 18th

Investigation on the Effect of the Self-generated Metal Vapo...

引用

18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Yang, Haonan Shen, Shuhang Xu, Ruoyu Zhou, Mingyu Wang, Zhongdong Centre for Smart Grid University of Exeter Exeter United Kingdom Global Energy Interconnection Research Institute Europe GmbH Berlin Germany State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9789819710713

Contact erosion is one of the key problems that limit the development of vacuum circuit breakers at higher voltage levels. Contact erosion in vacuum arc is the result of the plasma-surface interactions, located at the positions of cathode spots. simulation studies on cathode spot dynamics have been of great significance in investigating the mechanism of contact erosion. Previous cathode spot simulations commonly assumed that the leftover plasma ions have a constant density function, which initiate and maintain the cathode spot. However, this assumption has a critical limitation as it does not include the self-generated metal vapour from the cathode spot, which plays a dominant role in sustaining the cathode spot. In this work, the contribution of the self-generated metal vapour on the development of an individual cathode spot is investigated, by studying the effect of back ions. Based on a self-consistent cathode spot model developed by the Molecular Dynamics method, comparisons are made among different cases where the contributions of leftover plasma ions and back ions are controlled. This work models the self-sustaining cathode spot without continuous input of leftover plasma ions for the first time. simulation results show that the leftover plasma ions are necessary to initiate a cathode spot, while the self-generated metal vapour is sufficient to sustain the development of the individual cathode spot. The simulation results are validated by the comparable erosion speed of the crater depth to the experimental values. © beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Molecular dynamics

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of Power grid

Control Strategy of Direct-Driven PMSM Wind Turbines Partici...

引用

Energy, Electrical and Power Engineering (CEEPE), International Conference on

作者： Heming Yan Feng Ji Hui Pang Wenxuan Jia Chang Lin Xiangyu Pei State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China The college of Electrical and Electronic Engineering North China Electric Power University Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China

The large-scale grid connection of wind power brings challenges to the frequency stability of the power system, the system inertia decreases, the frequency regulation capability deteriorates, and the traditional wind turbine is difficult to meet the frequency regulation demand of the system. To address the problem of slow response of existing wind turbines participating in frequency regulation, this paper proposes a control method for permanent magnet direct-driven wind turbines participating in fast frequency response of the grid, based on power electronic converters equipped with electromagnetic level control speed to rapidly change the electromagnetic torque of the wind turbine rotor according to the system frequency change, increase or decrease the wind turbine speed to fully utilize the stored or released rotational inertia and achieve fast power regulation of the wind turbine. The results of the frequency step simulation of the permanent magnet direct-driven synchronous wind power system show that the fast frequency regulation response time of the control method proposed in this paper can reach the millisecond level.

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Optimal Design of Electromagnetic Structure of High-frequency Transformer

Optimal Design of Electromagnetic Structure of High-frequenc...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Yanjiao Jin Binhao Chen Guangyao Qiao Yunfei Xu Qiuyu Shi Weiguo Li State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (数字)9798350376067

ISBN: (纸本)9798350376074

The high-frequency transformer (HFT) plays a crucial role in dc/dc converters, necessitating an appropriate design to achieve optimal efficiency and power density. This study presents a novel design technique that combines scanning and multi-objective optimization. To convert the multiple objectives into a single objective optimization problem, we employ a weighting method while considering the interplay between leakage inductance and dc/dc converter parameters. The effectiveness of our proposed design methodology is validated through the development of a 10kHz/200kVA HFT prototype. The design method proposed in this paper was validated through prototype testing, demonstrating its effectiveness and accuracy, thereby holding significant engineering implications for the development of HFT.

关键词： Power system measurements Inductance Accuracy Density measurement Prototypes Energy conversion High-frequency transformers Electromagnetics Optimization Testing

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A Staged Strategy for MMC Offshore Converter Station Under Asymmetric AC Fault

A Staged Strategy for MMC Offshore Converter Station Under A...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Fangyuan Li Longze Kou Jiapei Zhou Jie Hao State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute CO. LTD. Beijing China State Grid Shanxi Electric Power Company electric power Science Research Institute Shanxi China

At present, offshore wind power has become an important development direction for wind power generation. Offshore wind farms often use high-voltage direct current transmission technology with modular multi-level voltage source converters (MMC-HVdc) to transmit electricity to the grid. However, the fault response characteristics of offshore wind farms through the MMC-HVdc transmission system are different from those through AC transmission way. Therefore, it is significant that studying the fault ride through (FRT) technology of offshore wind farms through the MMC-HVdc grid connection system for practical engineering. An electromagnetic transient simulation model for an offshore wind farm composed of a direct drive permanent magnet synchronous generator (D-PMSG) connected to the grid is established through MMC-HVdc transmission technology. The mechanism and suppression strategy of overvoltage generation in the transmission network are provided during the fault clearance and recovery phase of the offshore wind farm HVdc transmission system under AC asymmetric faults. A two-stage improved control strategy for MMC-HVdc offshore converter station in response to asymmetric faults has been proposed, which is beneficial for the joint system to quickly recover from the post fault system voltage and suppress the overvoltage risk during the fault clearing phase. Finally, the proposed strategy is validated based on a domestic ± 500kV project in China, demonstrating its effectiveness.

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Modeling of Carbon Emission Features of Electric Energy Substitution Users with Demand Response 7

Modeling of Carbon Emission Features of Electric Energy Subs...

引用

7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Qi, Zihan Zhang, Peng Zhang, Lu Zhang, Jing Tianjin University Key Laboratory of Smart Grid Ministry of Education Tianjin China Electric Power Research Institute State Grid Beijing Electric Power Company Beijing China Joint Laboratory of Electric Energy Substitution Technology China Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9798350345094

Under the condition of electric energy substitution, the features of carbon emission of users are affected by various factors such as energy consumption characteristics and demand response. This paper proposes a method for analyzing the features of carbon emissions in response to user participation. Firstly, the mathematical model of the adjustable capability of the user key electric energy replacement equipment is constructed. Secondly, sequential energy usage models that cover interruptible and shiftable loads are built. Finally, the modeling method of user carbon emission features considering user energy characteristics and demand response is presented. Through the case study, it can be seen that the carbon emission of electric energy substitution users fluctuates in the time sequence. The reduction periods and potentials of carbon emission among three typical users are different, and the carbon emission reduction can be achieved through complementary utilization. © 2023 IEEE.

关键词： Carbon

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A Digital Active Gate Driver for Parallel-Connected IGBTs in Hybrid dc Circuit Breaker Applications

A Digital Active Gate Driver for Parallel-Connected IGBTs in...

引用

HVdc (HVdc), International Conference on

作者： Hangyu Xu Xuequan Huang Jinkun Ke Jiancheng Bai Zhaoliang Guan State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

IGBT gate driver is the key component to ensure the stable operation of hybrid direct current circuit breaker (dcCB). A novel digital active gate driver (DAGD) for parallel-connected IGBTs is proposed to provide reliable fault current interruption. The proposed DAGD based on FPGA digital controller take energy from electromagnetic isolated power supply system and reduce the turn-off delay and suppress the voltage spike by variable gate controller. The effect of emitter parasitic inductors on current balancing of parallel IGBTs is analyzed in detail, and effective suggestions are proposed. Finally, the experimental platform for current interruption test is designed and built. The experimental results verify that DAGD cuts off 26.8kA dc current successfully and obtains good effect in parallel current sharing.

关键词： Insulated gate bipolar transistors Shunts (electrical) Circuit breakers HVdc transmission Voltage Logic gates Gate drivers Inductors Voltage control Testing

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Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

Research on Simulation Modeling Method of New Distributing N...

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International Conference on Power System technology (POWERCON)

作者： Huaiguang Gu Longze Kou Lin Zhu Yuqin Gao Yang Gao Ping Xiong State Key Laboratory of Advanced Transmission Technology Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. LTD. Changping Beijing China State Grid Hubei Electric Power Research Institute Hongshan District Wuhan City Hubei Province China

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed; Each simulation model is shown.

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