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Effective Ultra-High-Speed Identification Scheme of Lightning Strikes Suitable for VSC-Based DC grids

CSEE Journal of power and Energy Systems 2024年第2期10卷 548-561页

作者： Longlong Chen Xiangyu Pei Xiaoguang Wei Pengzhi Li Guangfu Tang North China Electric Power University(NCEPU) Beijing 102206China Changsha University of Science and Technology Changsha 410114China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd.Beijing 102209China

To ensure their sound and continuous operation to the greatest extent,VSC-based DC girds have extremely stringent requirements for transmission line relay *** terms of guaranteeing their reliability,accurate identification of lightning strikes on DC transmission lines is one of the urgent key problems to be *** effective ultra-high-speed identification scheme of lightning strikes suitable for the VSC-based DC grid is proposed in this ***,an 1-mode reverse voltage traveling wave(RVTW)is constructed applying the pole-mode transformation ***,fault traveling wave propagation characteristics along the DC transmission line are analyzed in depth utilizing Peterson's ***,differences of time-frequency electromagnetic transient characteristics of 1-mode RVTWs between disturbances and faults caused by lightning strikes are distinguished in detail by means of the classical wavelet transformation multi-resolution analysis ***,extensive simulations are carried out to evaluate the performance of the proposed identification scheme,and by which its excellent rapidity,reliability and robustness are *** Terms-Lightning-strike identification,Multi-resolution analysis,Relay protection,Traveling-wave protection,VsC-based DC grid,Wavelet transformation.

关键词： Lightning-strike identification Multi-resolution analysis Relay protection Traveling-wave protection VsC-based DC grid Wavelet transformation

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Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components

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CSEE Journal of power and Energy Systems 2024年第1期10卷 235-247页

作者： Zexin Zhao Weijiang Chen Zhichang Yang Guoliang Zhao Bin Han Yunfei Xu Nianwen Xiang Shulai Wang China Electric Power Research Institute Beijing 100192China State Grid Corporation of China Beijing 100031China State Grid Smart Grid Research Institute Beijing 102209China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research InstituteBeijing 102211China Hefei University of Technology Hefei 230009China

The modular multilevel matrix converter(M3C)is a potential frequency converter for low-frequency AC ***,capacitor voltage control of high-voltage and largecapacity M3C is more difficult,especially for voltage balancing between *** solve this problem,this paper defines sequence circulating components and theoretically analyzes the influence mechanism of different sequence circulating components on branch capacitor voltage.A fully decoupled branch energy balancing control method based on four groups of sequence circulating components is *** method can control capacitor voltages of nine branches in horizontal,vertical and diagonal *** influences of both circulating current and voltage,a cross decoupled control is designed to improve control *** results are taken from a low-frequency transmission system based on PSCAD/EMTDC,and effectiveness and precision of the proposed branch energy balancing control method are verified in the case of nonuniform parameters and an unbalanced power system.

关键词： Branch energy balancing control decoupled control low-frequency AC transmission modular multilevel matrix converter(M3C) sequence circulating components

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Distributed energy resources hosting capacity calculation based on PSO algorithm 9

Distributed energy resources hosting capacity calculation ba...

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9th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, ISAEECE 2024

作者： Li, Yaqiong Wang, Tongxun Wang, Zhikai Wang, Kexin Yu, Hongyang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Beijing China

ISBN: (纸本)9781510683303

In order to manage integration of Distributed Energy Resources (DER) into the grid, calculation of maximum allowable access capacity of DER is essential. This paper introduced a method of DER hosting capacity calculation based on PSO algorithm. The access capacity in each grid point is set as one element in particle coding chain. Using a testing case study of typical distribution network, the proposed method is conducted. Also, by changing the parameters involved in PSO, the impact of Iteration times, Scale of swarm as well as Calculation times are discussed and compared. Experimental results can prove the convergence and effectiveness of the proposed method. © 2024 SPIE.

关键词： Particle swarm optimization Particles power grids Photovoltaics Reflection Solar energy Evolutionary optimization Genetic algorithms Nonlinear optimization Reliability

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Stability Comparison Between grid-forming and grid-following Based Wind Farms Integrated MMC-HVDC

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Journal of Modern power Systems and Clean Energy 2023年第4期11卷 1341-1355页

作者： Rongcai Pan Dong Liu Shan Liu Jie Yang Longze Kou Guangfu Tang China Electric Power Research Institute Beijing 100192Chinaand he is also with the State Key Laboratory of Advanced Power Transmission Technology and Beijing Key Laboratory of DC Grid Technology&SimulationBeijing 102209China State Key Laboratory of Advanced Power Transmission Technology and Beijing Key Laboratory of DC Grid Technology&Simulation Beijing 102209China

grid-forming(GFM)control based high-voltage DC(HVDC)systems and renewable energy sources(RESs)provide support for enhancing the stability of power ***,the interaction and coordination of frequency support between the GFM-based modular multilevel converter based HVDC(MMC-HVDC)and grid-following(GFL)based RESs or GFM-based RESs have not been fully investigated,which are examined in this ***,the detailed AC-and DC-side impedances of GFM-based MMC-HVDC are *** impedance characteristics of GFL-and GFM-based wind turbines are next ***,the influences of GFL-and GFM-based wind farms(WFs)on the DC-and AC-side stabilities of WF-integrated MMC-HVDC systems are compared and *** results show that the GFM-based wind turbine performs better than the GFL-based wind ***,to support a receiving-end AC system,the corresponding frequency supporting strategies are proposed based on the GFM control for WF-integrated MMC-HVDC *** GFM-based WF outperforms the GFL-based WF in terms of stability and response *** in PSCAD/EMTDC demonstrate the DC-and AC-side stability issues and seamless grid support from the RESs,i.e.,WFs,to the receiving-end AC system.

关键词： Renewable energy source(RES) modular multilevel converter(MMC) wind farm grid-forming(GFM) highvoltage direct current

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Comparisons and Improvements of key Operating Characteristics of Current Source Converter Applied in HVDC System

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CSEE Journal of power and Energy Systems 2023年第5期9卷 1601-1612页

作者： Wenwen Zhang Longlong Chen Xiaoguang Wei Guangfu Tang Lei Qi Chong Gao Zhiyuan He the North China Electric Power University Beijing 102206China the State Key Laboratory of Advanced Power Transmission Technology Beijing Institute Of Smart EnergyBeijing 102206China the State Grid Smart Grid Research Institute Co.Ltd Beijing 102209China

Because of its controlled power factor and no commutation failure,current source converter(CSC)made up of reverse-blocking IGCTs(RB-IGCTs)offers broad application prospects in the field of HVDC *** voltage and power operating range as the most important operating characteristics should be paid attention to but they are always ***,the relationship between valve voltage and modulation index is *** particular,valve voltage of converter under the three typical modulation methods is compared,analyzed,and ***,with the help of the independent control strategy and coordinated control strategy of both ends,power operating ranges of the three modulation methods are comprehensively analyzed and ***,in order to solve power coupling at a low active power,the improved coordination control strategy at both ends in this paper is proposed and the relationships among active power,reactive power,DC current and phase angle difference are given in ***,a 500 kV/3 kA simulation system was built in PSCAD/EMTDC to obtain comparison results of the key operating characteristics of CSC under different modulation methods and the converter can realize unity power operation under random active power after adopting the improved coordinated control strategy,and DC current does not decrease to zero,verifying effectiveness of the coordinated control strategy.

关键词： Current source converter improved coordinated control strategy reverse-blocking IGCT valve voltage

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Optimal Design of Electromagnetic Structure of High-frequency Transformer

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

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

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

ISBN: (纸本)9798350376067

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. © 2024 IEEE.

关键词： High frequency transformers

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Reliability Evaluation and Optimization Design of DC Collection Based Large-Scale Offshore Wind power Plants 6

Reliability Evaluation and Optimization Design of DC Collect...

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6th International Conference on HVDC, HVDC 2024

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

ISBN: (纸本)9798350387759

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. © 2024 IEEE.

关键词： capacity availability DC collection based offshore wind power plants expected lifecycle electric power income not supplied main parameters optimization design reliability evaluation

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Research on Reliability Evaluation Methods for Traction power Supply Systems 6

Research on Reliability Evaluation Methods for Traction Powe...

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6th International Conference on Energy Systems and Electrical power, ICESEP 2024

作者： Wang, Heng Li, Yaqiong Wang, Tongxun Zhou, Shengjun State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350353563

The reliability design and analysis methods, which are pertinent to the traction power supply systems in weak grid, are far from perfect. The current results fail to offer a comprehensive assessment of the system's reliability. In this paper, by optimizing node number and parent node search method, a fault impact assessment method is proposed to classify each node according to the influence range and isolation range of shutdown components, which can achieve the accumulation of system reliability indicators and achieve the goal of evaluating the reliability of the whole system. In addition, this paper presents a method to quickly calculate the reliability of the system and the fault importance of each component by using Goal-Oriented (GO) method, and verifies the effectiveness of the proposed method with an example. The results show that the average error of the average downtime rate and the average downtime time is 4.09% and 5.33% respectively, which is within the error range. © 2024 IEEE.

关键词： power distribution reliability

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Voltage Open-Loop Control of Modular Multilevel Matrix Converter for Flexible Low-Frequency AC System Under Open-Phase 10

Voltage Open-Loop Control of Modular Multilevel Matrix Conve...

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10th IEEE International power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liu, A. Bao Yunfei Xu, B. Lu, C. Zhengang Guoliang Zhao, D. Wang, E. Yingpei State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Changping Beijing China

ISBN: (纸本)9798350351330

Flexible low-frequency AC transmission technology combines the advantages of high-voltage AC transmission and DC transmission, and has good development prospects. For transmission lines, single-phase grounding is the most common type of fault, and configuring single-phase reclosing can improve system stability. In view of this, a control strategy suitable for low-frequency transmission lines in open phase operation is proposed to ensure the stable operation of the converter valve during single-phase tripping. The article first introduces the structure of a dual ended flexible low-frequency AC system, and then analyzes the fault characteristics after single-phase tripping of low-frequency lines. Based on the fault characteristics, a voltage open-loop control strategy without voltage feedback is proposed. Finally, a dual ended low-frequency AC transmission system model based on M3C is constructed, and the effectiveness and feasibility of the proposed method are verified through simulation. © 2024 IEEE.

关键词： Electric power transmission

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The Multilevel Turn-off Method and Improved Detection Circuit are Proposed for SiC MOSFET Short-circuit 20

The Multilevel Turn-off Method and Improved Detection Circui...

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20th International Conference on AC and DC power transmission 2024, ACDC 2024

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

ISBN: (纸本)9781837242672

SiC MOSFET has excellent characteristics such as low loss, high switching frequency and withstand voltage value, which shows significant advantages in power electronics applications. However, its short-circuit tolerance is weak, and the protection circuit needs to have a faster response speed. Besides, under higher dI/dt and dV/dt conditions, the fast response and anti-noise ability of the SiC MOSFET short-circuit protection circuit are difficult to balance. In order to ensure the safe and reliable operation of SiC MOSFET, a detection circuit of desaturation voltage with compensation circuit is proposed, which reduces the influence of temperature change and load fluctuation on detection accuracy. At the same time, a multi-stage gate voltage reduction method is proposed, which can limit the increase of short-circuit current and improve the time of short-circuit fault detection blind zone to reduce the influence of interference noise. It can also reduce the change rate of short-circuit current and limit the turn-off overvoltage. © The Institution of Engineering & technology 2024.

关键词： Short circuit currents

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