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检索条件"机构=Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid"

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Mechanism Analysis of Fault Interaction Effects Between the Positive and Negative Poles in Bipolar MMC-HVdc Systems 6

Mechanism Analysis of Fault Interaction Effects Between the ...

引用

6th International Conference on Power and Energy Applications, ICPEA 2023

作者： Zhou, Xiao Yang, Yuexi Du, Zhenyu Sun, Tongyue Bai, Yu Lv, Zhenhua State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China State Grid Jiangsu Electric Power Co. Ltd. Research Institute Nanjing China

ISBN: (纸本)9798350359053

Modular multilevel converter (MMC) based high-voltage direct current (HVdc) is an effective solution for achieving large-scale coordination, complementarity, and reliable transmission of renewable energy, and is an important application direction for future high-voltage and large-capacity dc transmission. However, at the dc side of the bipolar VSC-HVdc system, if the pole-to-ground fault occurs in one pole, it will not only lead to the rapid rise of fault current that may damage the power electronic devices, but also affect the operation of the other pole. Therefore, it is of great importance to investigate the characteristics of the pole-to-ground fault at dc side and the mechanism of fault interaction effects between two poles. In this paper, the operation principle of the MMC and the bipolar VSCHVdc system are introduced firstly. Then, the characteristics of the pole-to-ground fault are analysed and the interaction effects is studied. Finally, the fault characteristics and mechanism of interaction effects are verified by electromagnetic transient (EMT) simulations. © 2023 IEEE.

关键词： Poles

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Effective Neumann Boundary Condition for Boundary Layer at Ohmic Contact

Effective Neumann Boundary Condition for Boundary Layer at O...

引用

2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Zhang, Nian-En Wang, Yin-Da Chi, Bo-Ming Yin, Wen-Yan College of Isee Zhejiang University Hangzhou China State Grid Key Laboratory Beijing Smart-Chip Microelectronics Technology Beijing China

ISBN: (纸本)9781733509657

The ohmic contacts in semiconductor simulation lead to thin boundary layers with sharp peaks in simulations. It stems from singular logarithmic quasi-Fermi potential function. This paper proposes an effective Neumann condition. Such a boundary condition reduces computational cost and retains rather high accuracy simultaneously. This method is tested with a PN junction and validated by the accuracy of terminal current. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Ohmic contacts

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Influence of Cross-linking Characteristics of dc Cable Insulation on dc Performance 4

Influence of Cross-linking Characteristics of DC Cable Insul...

引用

4th IEEE International Conference on Electrical Materials and Power Equipment, ICEMPE 2023

作者： Li, Wenpeng Zhao, Weijia Peng, Weilong Zhang, Chong Chen, Xin Zhong, Lisheng Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China Beijing Institute of Smart Energy Changping District Beijing China State Grid Zhoushan Power Supply Company Zhoushan China State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350334678

The high-voltage dc cross-linked polyethylene (XLPE) insulated cable is a critical component of the flexible dc transmission system. Its insulating materials must meet stringent requirements for properties such as dc conductivity, space charge, and dc breakdown field strength. Unfortunately, high-performance cable materials needed for dc XLPE cables have been monopolized by foreign companies for a prolonged period, which has become a major bottleneck for the development of high-voltage dc cables in China. In this study, we first sliced the domestic and imported cable insulations, then tested the cross-linking degree (gel content) and microstructure of the cable slice samples for both types of insulation while in the undegassed state. This paper explains the variations in the micro cross-linking characteristics of the two types of cables and introduces a time-frequency domain hybrid analysis method based on polarization current. The method calculates the low-frequency dielectric constant and dielectric loss angle tangent of the cable, along with their change laws. By doing so, we can assess the state of cross-linking by-products in the cable insulation, laying a theoretical and experimental foundation for establishing a real-time monitoring approach for the cable degassing process. © 2023 IEEE.

关键词： HVdc power transmission

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A Micro Switch Based Modeling Method for LCC-HVdc System 14

A Micro Switch Based Modeling Method for LCC-HVDC System

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14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023

作者： Zhu, Lin Gu, Huaiguang Li, Shujing Yang, Mingcheng Liu, Qi Jia, Chen Yang, Luyu State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Beijing Electric Power Company State Grid Beijing Fengtai Power Supply Company Beijing China College Northeast Electric Power University Electrical Engineering Jilin City China Liaoning Electric Power Academy of State Grid Technology Management Department Shenyang China

ISBN: (纸本)9798350328233

Power system simulation is an important tool to analysis the mechanism and characteristics of high voltage direct current (HVdc) systems. With the increased transmission lines in system, the calculation amount and complexity of simulation increase greatly. The line commutated converter (LCC) is the most widely used converter in HVdc system. The average model of LCC lacks the commutation process and can only be used for steady-state analysis. The switch model is too detail for large system simulation, making the calculation amount too large. Therefore, a modeling method based on micro switch is proposed for LCC in this paper, which reflects the commutation process of converter but has less calculation. Firstly, the basic concept of micro switch is introduced. Secondly, the external characteristics of the active inverter are analyzed. Then, the process of LCC commutation is analyzed to express the characteristics of thyristor unit. Finally, the effectiveness of the micro switch modeling method is verified by simulation. Compared with the switch model, the proposed model can effectively shorten the simulation time, and retain the inverter commutation process, and further simulate the commutation failure scenario in the future. © 2023 IEEE.

关键词： Thyristors

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Overvoltage Absorption of Sparse Modular Multilevel Converter 7

Overvoltage Absorption of Sparse Modular Multilevel Converte...

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7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Li, Jiangyuan Ma, Mingyao Xu, Yunfei Liu, Bao Jia, Chen Institute of Power Electronics and Systems Hefei University of Technology Hefei China State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (纸本)9798350359558

A topology is presented that is designed to address overvoltage occurrences when the Sparse Modular Multilevel Converter (SMMC) changes voltage polarity. The proposed topology mitigates overvoltage induced by abrupt changes in bridge arm inductance current during voltage commutation. This is achieved by incorporating dual RCD buffer circuits connected in parallel at both ends of the SMMC bridge arm inductance. Additionally, design formulas for the capacitance and resistance in the dual RCD buffer circuits are derived based on the voltage commutation process and operating conditions of the SMMC. The effectiveness of the proposed topology and the design formulas for RCD parameters were validated through simulation. © 2024 IEEE.

关键词： Topology

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Influence of Impregnation state on the Electrical Characteristics of Polypropylene Film for High-voltage capacitors 10

Influence of Impregnation State on the Electrical Characteri...

引用

10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Xing, Zhaoliang Zhang, Jianjun Zeng, Fanqiu Wang, Jian Guo, Shaowei Zhang, Xinghui Zhang, Chong Yu, Yong Qi, Bo Gao, Chunjia State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Tangshan Power Supply Company Tangshan China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Corporation of China Beijing China

ISBN: (纸本)9798350309379

Biaxially oriented polypropylene (BOPP) film are generally impregnated in benzyltoluene, which constitute insulating medium of high-voltage capacitors. In order to investigate the electrical properties of impregnated film, this paper builds a test platform for the electrical properties of polypropylene film, and selects key electrical properties such as relative dielectric constant, dielectric loss and breakdown field strength. Testing five thicknesses of film to obtain the laws of the influence of impregnation state on electrical parameters at different temperatures and field strengths. The test result shows that: 1) Dielectric constant of the impregnated film increases from 2.25 to 2.27 at room temperature, the dielectric loss increases from 1.39×10-4 to 2.7×10-4, the average value of dc breakdown field strength of the 13 μm film increases from 619 MV/m to 683 MV/m, the average value of AC breakdown field strength increases from 420 to 460 MV/m. 2) Impregnated film is more affected by the temperature and field strength. The temperature changes from 293K to 353K, the growth rate of dielectric constant increases from 0.5% to 2% after impregnation, and the dielectric loss increases from 1 to 1.5 times. 3) Breakdown field strength increases and then decreases with the thickness, and 13μm film has the highest breakdown field strength. © 2023 IEEE.

关键词： biaxially oriented polypropylene film electrical characteristics impregnation

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Static-dynamic Performance Analysis of Flexible Power Transformer 6

Static-dynamic Performance Analysis of Flexible Power Transf...

引用

6th IEEE Information technology, Networking, Electronic and Automation Control Conference, ITNEC 2023

作者： Li, Weiguo Qiao, Guangyao Jin, Yanjiao Li, Lu Yang, Zhichang Tang, Aihong Wang, Qian State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Fuxin Electric Power Supply Company Fuxin China Wuhan University of Technology School of Automation Wuhan China

ISBN: (纸本)9781665460033

Aiming at the problem that intermittent wind power and randomness of wind speed will lead to frequent and large fluctuation of grid connected voltage in large-scale wind power grid connected scenarios, a flexible power transformer based on power electronic devices is proposed. Firstly, the topology of flexible power transformer is proposed and its operation principle is analyzed;Secondly, its mathematical model is constructed and the corresponding control strategy is proposed;Finally, by building a flexible power transformer simulation model and analyzing the simulation results of its voltage regulation under wind speed changes, the rationality of the proposed flexible power transformer topology and the effectiveness of the flexible power transformer in regulating wind speed changes and grid connected voltage fluctuations are verified. © 2023 IEEE.

关键词： Power transformers

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simulation MODEL OF MEMBRANE SOUND ABSORBER WITH MAGNET 29

SIMULATION MODEL OF MEMBRANE SOUND ABSORBER WITH MAGNET

引用

29th International Congress on Sound and Vibration, ICSV 2023

作者： Nie, Jingkai He, Qiang Han, Yu Fan, Chao Tian, Yi Zhao, Junjuan Xiao, Weimin State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Institute of Urban Safety and Environmental Science Beijing Academy of Science and Technology Beijing China

ISBN: (纸本)9788011034238

By tuning magnets, Membrane sound absorbers (MSAs) can possess adjustable properties and facilitate compact designs for low-frequency noise control. In this paper a finite element simulation model was designed to investigates the low-frequency properties of MSAs with different states. The simulation results of acoustic absorption coefficient are consistent with the experimental results, thereby verifying the validity of the simulation approach. Then, the sound absorption characteristics such as resonance modes, vibration displacement of the MSA were analysed by the simulation model. The simulation model and its research results are helpful to the deep understanding of MSA low frequency energy dissipation mechanism and provide a method for acoustics engineers to develop optimized tunable large-scale MSA that can be easily adapted to noise source variation, such as the power equipment with low-frequency noise control problem that is addressed in the future study. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved.

关键词： Acoustic wave absorption

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Basic Modulation Strategy and Sub-module Voltage Balancing Control for Half-Wave Inverter AC-AC Converter 6

Basic Modulation Strategy and Sub-module Voltage Balancing C...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Li, Jiangyuan Ma, Mingyao Chen, Qiang Wang, Hanyu Zhao, Guoliang Xu, Yunfei School of Electrical Engineering and Automation Hefei University of Technology Hefei China State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350346671

Flexible low-frequency transmission technology has competitive advantages in offshore wind power transmission, and the converter is the key equipment of flexible low-frequency transmission technology. According to the requirements of high-voltage and large-capacity scenarios, the topology and working principle of a half-wave variable-frequency AC converter applied to flexible low-frequency transmission are introduced. The topology can realize four-quadrant operation, and the number of sub-modules at the same voltage level is less than that of a modular multi-level matrix converter (M3C). On this basis, the modulation strategy and the sub-module capacitor voltage control are studied, and a sub-module capacitor voltage balance throwing strategy based on the nearest level approximation is proposed. This method can quickly realize the output voltage modulation, effectively control the capacitor voltage unbalance, and reduce the switching loss. Finally, MATLAB/Simulink simulation is used to verify the effectiveness of the proposed throwing strategy in the half-wave low-frequency AC converter. © 2023 IEEE.

关键词： Matrix converters

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Maximum Turn-Off Current of SiC MOSFET-Based Solid state Circuit Breaker 4

Maximum Turn-Off Current of SiC MOSFET-Based Solid State Cir...

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4th International Symposium on Electrical, Electronics and Information Engineering, ISEEIE 2024

作者： He, Tianpeng Zhou, Qihao Li, Pengzhi Zhang, Xiangyu Qi, Lei North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing China State Grid Inner Mongolia Eastern Power Co. Ltd. Dc management position Equipment management department Neimenggu China State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (纸本)9798350355772

Nowadays, solid-state circuit breakers(SSCB) are widely adopted in direct current (dc) microgrid because of their advantages such as interruption without arc and faster turn-off speed. The SSCB primarily operates at high temperature. Traditional Si based devices cannot meet requirements for high-temperature operation. Due to their advantages of low conduction losses and high-temperature resistance, SiC MOSFETs present extensive prospects for high-temperature applications within SSCBs. In SSCBs, one of the key properties of power semiconductors is their ability to turn off pulsed overcurrent. Therefore, it is necessary to research on the maximum turn-off capability of SiC MOSFETs under various temperature conditions. The simulation of SiC MOSFET single pulse circuit in L Tspice is used to understand the turn-off current waveform of SiC MOSFET. Based on the study of single failure waveforms and Foster thermal network model, the desaturation voltage of SiC MOSFET is taken as the basis of maximum turn-off current. The final experimental results show that the maximum turn-off current of SiC MOSFET can reach 4-5 times of the rated current under various temperature conditions. This research provides crucial insights for the better application and optimization of SiC MOSFET in SSCBs. © 2024 IEEE.

关键词： Timing circuits

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