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

共 331 条记录，以下是21-30 订阅

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A Novel Differential Current Protection and Fault Pole Identification Method Based on Modulus Value

A Novel Differential Current Protection and Fault Pole Ident...

引用

2024 China HVdc and Power Electronics Annual Meeting of Chinese Society of Electrical Engineering, dcPE 2024

作者： Zhou, Bohao Han, Jiahui Li, Jun He, Jiawei Wei, Qi Li, Tong Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China DC Technology Center of State Grid Corporation of China Beijing China State Grid Gan Su Extra High Voltage Company Lanzhou China

ISBN: (纸本)9781837242689

Direct current differential protection typically incorporates a one-second delay to prevent malfunction. However, the rapid development of faults in MMC-HVdc systems undermines its effectiveness. This paper proposes a novel current differential protection criterion and fault pole selection method that not only can enhance the reliability and speed of differential protection,but also eliminate the influence of frequency variation in line parameters. The proposed method demonstrates improved selectivity, speed, and sensitivity compared to traditional direct current differential protection. The advantages of this method are verified through simulation results from a ± 800kV hybrid three terminal HVdc system in PSCAD/EMTdc. © The Institution of Engineering & technology 2024.

关键词： HVdc power transmission

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A Dead Time Compensation Method of Constant Common Mode Voltage CPS SPWM for MMC 2

A Dead Time Compensation Method of Constant Common Mode Volt...

引用

2nd China Power Supply Society Electromagnetic Compatibility Conference, CPEMC 2024

作者： Wang, Zuoxing Li, Hong Li, Yanjun He, Daozhen Yang, Zhichang School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Beijing China

ISBN: (纸本)9798331509552

—The modular multi-level converter (MMC) has demonstrated significant potential in high voltage direct current (HVdc) transmission and high voltage motor drive applications. Constant common mode voltage (CMV) modulations for MMC can effectively reduce the common mode (CM) electromagnetic interference (EMI) in MMC by minimizing CMV fluctuations to zero under ideal condition. However, the dead time required to protect power semiconductor devices in MMC seriously weakens the suppression effect of constant CMV modulations on CM EMI. This paper presents a method of dead time compensation with carrier phase compensation for MMC using constant CMV carrier phase shifted (CPS) sinusoidal pulse width modulation (SPWM). Phase compensation (PC) CPS SPWM is one of the constant CMV modulations for MMC. The operation principle of PC-CPS SPWM is introduced, and the mechanism of CMV fluctuations caused by dead time is analyzed. Compensation strategies for carrier phase positions and modulation signals in dead time compensation of PC-CPS SPWM are presented as DPC-CPS SPWM. The simulation results validate the proposed method, providing guidance for modulation design in MMC with low EMI requirements. ©2024 IEEE.

关键词： HVdc power transmission

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Mechanism and data based modelling method of photovoltaic energy storage and transmission system 9

Mechanism and data based modelling method of photovoltaic en...

引用

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

作者： Gu, Huaiguang Kou, Longze Gao, Yuqin Liu, Dong Liu, Dan Li, Linzhuo State Grid Smart Grid Research Institute Co. Ltd. Changping District Beijing102209 China State Key Laboratory of Advanced Power Transmission Technology Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Changping District Beijing102209 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China North China Electric Power University Hebei Baoding071000 China

ISBN: (纸本)9781510683303

The power system model with power electronic equipment is usually a mechanism model, which needs to solve large-scale nonlinear differential algebraic equations. The solution process requires a large number of iterations, with a large amount of calculation. To address these issues in the mechanism model, a mechanism and data based modelling method based on artificial intelligence algorithms is proposed. This method replaces some complex mechanism models with data models, which can reduce the problem of requiring a large number of iterations for power electronic devices in the mechanism model. By controlling the sampling time, the accuracy control of the mechanism and data based model is achieved, finally, the mechanism and data based model of photovoltaic energy storage and transmission system is completed, improving the running speed. © 2024 SPIE ·

关键词： Data modeling Solar energy Modeling Photovoltaics Batteries Solar cells Electronic components

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Research on the Design of Main Circuit Parameters of CSC-MMC dc Transformer 6

Research on the Design of Main Circuit Parameters of CSC-MMC...

引用

6th International Conference on HVdc, HVdc 2024

作者： Li, Jie Wu, Yilin Lin, Zhiguang Chen, Kailong Gao, Chong He, Zhiyuan North China Electric Power University State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Smart Grid Research Institute Co. Ltd North China Electric Power University State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350387759

The dc transformer is the core equipment to realize the dc collection and transmission of new energy sources, and the CSC-MMC dc transformer (CSC-MMC) is mixed with the controllable current source converter (CSC) and the modular multilevel converter (MMC), which can realize high controllable commutation, high power density design and high efficiency power transmission. The CSC two degrees of freedom fundamental frequency modulation (TDFFFM) has the advantages of low switching frequency, low transmission loss, and independent regulation of active and reactive power. In this paper, for the CSC-MMC based on TDFFFM, the main circuit parameter design method is proposed: the CSC smoothing reactor is designed with the dc current fluctuation rate as the constraint, the filter capacitor is constrained by the CSC modulation ratio;the MMC submodule capacitor is designed with the voltage fluctuation rate of capacitor, and the bridge arm inductance is designed from the transmission power and circulation avoidance. At the same time, the influence of AC frequency on loss is explored. © 2024 IEEE.

关键词： dc transformer fundamental frequency modulation parameter design transmission efficiency

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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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2023 International Conference on Power System technology, PowerCon 2023

作者： Gu, Huaiguang Kou, Longze Zhu, Lin Gao, Yuqin Gao, Yang Xiong, Ping State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Changping Beijing102209 China State Grid Hubei Electric Power Research Institute Hongshan District Hubei Province Wuhan City430015 China

ISBN: (纸本)9798350300222

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. © 2023 IEEE.

关键词： Electric power distribution

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Fault identification of converter valve structure looseness based on Mel-spectrum and convolutional neural network 4

Fault identification of converter valve structure looseness ...

引用

4th International Conference on Electrical Engineering and Mechatronics technology, ICEEMT 2024

作者： Sun, Tianshu Yin, Yibo Liu, Jin Zhang, Xiaolong Zheng, Lin Gong, Shaoyan Zhang, Jianan Institute of HVDC Transmission Technology State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9798350356472

The ultra-high voltage dc converter valve generates strong vibration during operation. It may exacerbate loosening caused by improper installation, maintenance, or degradation of structural components. This poses significant risks to the operation of the converter valve. Structure looseness is not easily noticeable, but it can affect the propagation of vibration signals, which are then manifested through sound. This article proposes a model based on Mel-spectrum and convolutional neural network to identify structure looseness faults in ultra-high voltage dc converter valves. Firstly, an experimental platform was established to conduct time-frequency domain analysis of the voiceprint signals of the converter valve under different states. Then, Mel filtering is used to extract key features from voiceprint data while reducing data dimensions. Finally, a fault recognition model is built based on convolutional neural networks to achieve pattern recognition of screws looseness in the busbar. And the accuracy and timeliness of the research results in this article have been verified through comparative experiments, which can provide more references for online monitoring of converter valves. © 2024 IEEE.

关键词： Convolutional neural networks

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A method for suppressing commutation failure based on dynamic adjustment of the minimum extinction angle of thyristors 6

A method for suppressing commutation failure based on dynami...

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6th International Conference on HVdc, HVdc 2024

作者： Chen, Yongtao Zhang, Chong Huang, Ruiling Deng, Nan Wang, Hongbin Wu, Xueguang State Grid Chongqing Electric Power Research Institute Chongqing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9798350387759

The minimum extinction angle (γmin) of thyristors is a quantity that dynamically changes with the system operating conditions. When the extinction angle γ is less than its minimum value, a phenomenon of commutation failure will occur. In order to reduce the risk of commutation failure in practical engineering, considering the dynamic change process of extinction angle during the system operation, a dynamic control strategy for the extinction angle based on the measured minimum value of thyristors has been proposed in the paper. To verify its effectiveness, a CIGRE LCC-HVdc benchmark model was developed on the PSCAD/EMTdc V5 software platform. simulation analysis shows that γmin has a significant impact on the stability of systems under fault conditions. The proposed method can effectively suppress commutation failure induced by different types of faults, which is beneficial for increasing the margin of extinction angle and has guiding significance for practical engineering. © 2024 IEEE.

关键词： commutation failure extinction angle thyristors

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Influence of Film Material Characteristics on the Ultimate Insulation Performance of dc capacitor Elements 19th

Influence of Film Material Characteristics on the Ultimate I...

引用

19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Guo, Shaowei Xing, Zhaoliang Zhang, Chong Zhang, Zhaotian Su, Yaotian Liu, Juyang Chen, Xin State Key Laboratory of Advanced Power Transmission Technology Beijing China China Electric Power Research Institute Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (纸本)9789819613861

Dry-type dc capacitors are pivotal elements in power electronic converter devices, serving essential functions in voltage support and filtering. The electrical and temperature resistance properties of the core material, biaxially oriented polypropylene film, directly impact the insulation capabilities of the capacitors. This study selects three types of polypropylene film materials, vapor-deposits them into distinct metallized films, and fabricates elements. It conducts experimental research including terminal withstand voltage, durability, and ultimate withstand voltage tests. Experimental results indicate that the three types of film material elements perform similarly in the terminal withstand voltage and durability tests. However, elements made from HC300BF film material exhibit superior ultimate insulation performance, while those made from GC-2 film material demonstrate effective ultimate insulation at elevated temperatures. This suggests that enhanced isotacticity and temperature resistance of polypropylene film materials significantly influence the ultimate insulation performance of dry dc capacitors. © beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Capacitor bank

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key technology of Hybrid Cascaded UHVdc Transmission System 18

Key Technology of Hybrid Cascaded UHVDC Transmission System

引用

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

作者： Zhou, Jiapei Kou, Longze Gu, Huaiguang Zhu, Lin State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

The Baihetan-Jiangsu UHVdc transmission project is one of the backbone links of the West-East power transmission project in China. To meet the needs of the Baihetan-Jiangsu UHVdc transmission project, this paper proposes a hybrid cascaded HVdc transmission technology, in which sending-end adopts LCC and receiving-end adopts LCC-VSC in series. This technology can possess advantages of both LCC and VSC. This paper introduces the topology and key equipment of the hybrid cascaded HVdc system. Among them, the hybrid dc filter (H-dcF), the hybrid dc energy release device (H-dcERD) and fast bypass switch are innovatively utilized for the first time. Secondly, the control strategy of the system is studied, including the start-stop strategy, AC fault analysis and dc fault analysis. To verify the feasibility of the proposed hybrid cascaded HVdc transmission system, simulation tests for the system start-stop, AC fault and dc fault are carried out based on the simulation model built in PSCAD. The test results indicate that the hybrid cascaded HVdc technology has a smooth start-stop, flexible operation mode, reliable fault ride-through, and is feasible in engineering. © ACdc 2022. All rights reserved.

关键词： Transient analysis

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Principle and System Performance of Flexible-Commutation Converter 6

Principle and System Performance of Flexible-Commutation Con...

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6th International Conference on HVdc, HVdc 2024

作者： Yang, Jun Wu, Fangjie Zhang, Jialin Ji, Yiming Wang, Purui Zhang, Jing Li, Tingting State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China Research Institute Co. Ltd State Grid Economic and Technological Beijing China Disaster Prevention and Reduction Changsha University of Science and Technology State Key Laboratory of Power Grid Changsha China

ISBN: (纸本)9798350387759

The traditional line commutated converter has the disadvantages of high harmonic content and high reactive power consumption. So it needs a good deal of filters and reactive power compensation equipement. To deal with this problem of traditional converters, a flexible-commutation converter topology suitable for replacement of traditional line commutated converter is proposed in this paper with its control strategy as well. Then the reactive power and harmonic characteristics of the converter are analyzed. Finally, the electromagnetic transient simulation model is built to validate the excellent performance of the flexible-commutation converter. The simulation results indicate that the AC and dc harmonics of the flexible-commutation converter are greatly reduced compared with the conventional line commutated converter. At the same time, only a little reactive power is consumed when transmitting large capacity active power. © 2024 IEEE.

关键词： flexible-commutation converter harmonic analysis HVdc line commutated converter

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