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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151-160 订阅

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Fretting Wear Failure Modeling of Press-Pack IGBT Device based on Digital Twin Method

Fretting Wear Failure Modeling of Press-Pack IGBT Device bas...

引用

2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Wang, Yuqi Yao, Ran Li, Hui Zhou, Bailing Duan, Zeyu Chen, Zhongyuan Li, Jinyuan Wang, MiaoRui The State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing400044 China State Key Laboratory of Advanced Power Transmission Technology Beijing Institute of Smart Energy Beijing China The State Grid Chongqing Electric Power Research Institute Chongqing401123 China

ISBN: (纸本)9798350322699

Fretting wear failure is one of the main failure modes of Press-Pack IGBT (PP-IGBT) device. This paper presents a method to simulate the fretting wear failure of the PP-IGBT device based on digital twin modeling. Firstly, the digital twin model of the PP-IGBT device is established by considering power input as feedback, and the electrical, thermal, and mechanical stress distribution inside the devices is analyzed. Secondly, based on the aging test results of the PP-IGBT devices, the mapping relationship between the contact thermal resistance and the number of cycles is extracted, and the digital twin model of the PP-IGBT device with contact thermal resistance changes is established. Finally, the digital twin simulation of a multi-chip PP-IGBT device is carried out, and the results are verified by power cycling experiments. The experimental results show that the junction temperature error between the fretting wear aging modeling and the experimental result is less than 2.5 oC. © 2023 IEEE.

关键词： Digital twin modeling Fretting wear Press-pack IGBT device Thermal contact resistance

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Principle and System Performance of Flexible-Commutation Converter

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

引用

HVdc (HVdc), International Conference on

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

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

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.

关键词： Reactive power Thyristors Filters HVdc transmission System performance Harmonic analysis Valves Transformers Topology Power harmonic filters

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simulation of ion bombardment of dense plasma on cold cathode by Molecular Dynamics 30

Simulation of ion bombardment of dense plasma on cold cathod...

引用

30th International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV 2023

作者： Yang, Haonan Shen, Shuhang Wang, Zhongdong Xu, Ruoyu Zhou, Mingyu University of Exeter Centre for Smart Grid 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)9784886864369

In vacuum arcing, contact erosion is closely related to the cathode spot dynamics. It is commonly accepted that the ions from leftover plasma and metal vapor ionization are the main sources of bombardment. In this paper, the process of ion bombardment (IB) on a cold cathode is simulated by the Molecular Dynamics (MD) method. The model is composed of a copper substrate and the inserted copper ions, whose energy is calculated according to the theory of the surface layer. To investigate the effects of ion energy and ion current density distribution on the process of IB, three types of simulation, including single IB, continuous IB at one site, and regional continuous IB, are conducted. From the simulation results, the mechanism of crater formation is proposed. It's found that the pressure effect of IB is mutually decided by the ion energy and the local surface temperature, the latter of which is controlled by the ion current density. This work also provides a possible explanation on various sizes of the cathode spot measured in the experiments. © 2023 IEEJ.

关键词： Molecular dynamics

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A Transient Voltage Support Strategy Based on Medium Voltage Photovoltaic grid-Connected Converter During Commutation Failure in the LCC-HVdc System

A Transient Voltage Support Strategy Based on Medium Voltage...

引用

IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Hong Lu Yali Liu Yijia Yuan Weihua Deng Pengfei Su Xirui Jiang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Sichuan University Beijing Chengdu China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

The transient overvoltage caused by commutation failure in the LCC-HVdc system is a key factor limiting the dc transmission capacity. During the commutation failure period, the voltage of the sending AC grid exhibits a characteristic of "first decrease then rise", and the time to transition from low voltage to high voltage is relatively short. The existing photovoltaic (PV) grid-connected converters have the characteristics of long equivalent electrical distance from the grid, small capacity, and weak reactive power support ability, making it difficult to effectively support transient voltage. This article proposes a method of using medium voltage PV grid-connected converters to support the transient voltage caused by commutation failure in the LCC-HVdc system, which actively responds to voltage changes through a grid-forming control strategy and can instantly adjust the reactive power output of the converter. The simulation results show that the proposed method can effectively support the transient voltage and reduce the amplitude of transient overvoltage.

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Research on High Voltage High Capacity Multi-port Energy Router

Research on High Voltage High Capacity Multi-port Energy Rou...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Deng Weihua Ji Lanlan Liu Yali Jiang Zhe Han Naizheng Lin Zhiguang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

Energy routers are key devices that promote the utilization and consumption of new energy resources, as well as achieve energy conversion and routing. This article proposes a new idea of high-voltage and large-capacity energy routers for regional energy management. A 110kV seven-port energy router electrical topology is constructed, consisting of three modular multi-level AC/dc converters, three bidirectional dc/dc transformers, and one dc circuit breaker. A detailed analysis is conducted on four different operating modes and the respective control strategies of the energy router. The VF droop controller is designed, including voltage droop control and frequency droop control. For demonstration engineering applications, an energy router start stop control logic has been designed. Finally, the effectiveness of the control strategy proposed in this paper is verified through the switching test waveforms between the main operation mode and auxiliary operation mode on the demonstration project site.

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The Research on Cluster dc Voltage Balancing of Star-Connected Cascaded H-bridge STATCOM

The Research on Cluster DC Voltage Balancing of Star-Connect...

引用

IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Kai Hu Guoliang Zhao Zhengang Lu Hongyang Yu Weiguo Li Chaobo Dai State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China

Star-connected cascaded H-bridge STATCOMs are widely used in power systems due to their modular performance, small output harmonics, and applicability to high voltage. However, the uneven losses of three phases and the unbalanced active power generated by unbalance grid voltages lead to the problem of phase to phase dc voltage unbalance in star-connected cascaded H-bridge STATCOMs. The clustered dc voltage balancing control using zero sequence voltage injection is suitable for star-connected cascaded H-bridge STATCOMs because no zero-sequence current is generated in the three-phase three-wire system. However, the conventional zero-sequence voltage injection method contains many complex operations, such as trigonometric operations, square root and inverse trigonometric operations, etc. These complex operations increase the computational burden of the controller. In order to eliminate the complex operations of the traditional method, this paper proposes an improved phase-to-phase dc voltage equalization control strategy by deriving the active power relationship of the three phases of STATCOM, which has no complex operations such as inverse trigonometric function, and also extracts the unbalanced power directly from the grid voltage as feedforward control, which improves the control effect and dynamic performance of phase-to-phase dc voltage equalization. Finally, the effectiveness of the proposed control method is verified by simulation.

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Analysis of Various Aggregation Modes for High Voltage Direct Current Power Transmission Serving Offshore Wind Power

Analysis of Various Aggregation Modes for High Voltage Direc...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Weihua Deng Yue Gao Kaijie Gou Heng Chen Guoqiang Zhang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China North China Electric Power University Beijing China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

With the deepening of energy and power transformation, the field of renewable energy is booming, among which the offshore wind power has gradually become an important direction of new energy development because of its advantages of high energy efficiency and suitable for centralized development. With the continuous expansion of the development scale of offshore wind farms and their gradual expansion to the far-reaching sea, offshore wind power faces the influence of factors such as changing operating environment and increasing construction difficulty, which also promotes the acceleration of the application and development of new technologies, among which HVdc has become one of the future development directions of large-scale offshore wind farm power transmission. In order to further improve the reliability and economy of offshore wind farms, this paper compares the AC and dc aggregation modes of offshore wind power cluster under dc transmission conditions, and analyzes the characteristics and advantages and disadvantages of two converging modes in terms of economy and energy loss.

关键词： Wiring Energy loss Costs HVdc transmission Voltage High-voltage techniques Wind power generation

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Analysis of Various Aggregation Boost Topologies for dc Offshore Wind Power

Analysis of Various Aggregation Boost Topologies for DC Offs...

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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Weihua Deng Yue Gao Heng Chen Ying Sun Lei Zhang State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd) Beijing China North China Electric Power University Beijing China

ISBN: (数字)9798350373479

ISBN: (纸本)9798350373486

With the rapid development of new energy technology, offshore wind power shows a trend of large scale wind turbines, wind field area expansion and the application of dc convergence and dc transmission. Economic and effective large-scale offshore wind power convergence and transmission methods have been increasingly concerned. In order to improve the economy of offshore wind power and make full use of offshore wind power resources, offshore wind power HVdc transmission and dc pooling related technologies have been proposed. This paper will introduce various aggregation boost topologies of dc offshore wind power, study the characteristics of the power aggregation topology structure in the dc aggregation boost system under typical offshore wind power output scenarios, analyze the construction costs and energy loss characteristics of various topology structures, and then find the most suitable dc aggregation scheme configuration for large offshore wind farms, improve the overall benefits of offshore wind power dc aggregation boost systems.

关键词： Energy loss Power cables Wind power generation Wind farms Reliability engineering Market research Wind turbines

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A Novel Modular Multilevel Converter-Based Hybrid Photovoltaic and Battery Storage System

A Novel Modular Multilevel Converter-Based Hybrid Photovolta...

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

作者： Hong Lu Lanlan Ji Yijia Yuan Yali Liu Kailong Chen Zhiguang Lin State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Sichuan university Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Sichuan university Chengdu China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China

The large-scale development of photovoltaic (PV) requires the PV grid-connected system to have the ability to actively support the grid. The existing PV converter topology has problems of small capacity and weak transient support ability. This article proposes a novel converter topology (HMMC) that integrates PV and battery into the submodules of modular multilevel converter, which can effectively enhance the capacity of a single converter. Based on the analysis of the capacitor energy and energy storage energy inside HMMC, a grid-forming (GFM) control strategy for HMMC was designed, which can achieve self-synchronous operation and support grid frequency and voltage. The effectiveness of the proposed topology and control strategy was verified through simulation results.

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Behavior Modeling and Analysis of High-Voltage SiC MOSFET Considering Temperature Effect

Behavior Modeling and Analysis of High-Voltage SiC MOSFET Co...

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Annual Conference of Industrial Electronics Society

作者： Weiguo Li Yunfei Xu Qingping Li Yi Hao Guoliang Zhao Haijun Liu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Research Institute Co. Ltd Beijing China

Silicon carbide (S iC) MOSFETs have better dynamic characteristics and higher operating temperatures, and are more suitable for high temperature, high-frequency and high-voltage applications due to their fast turn-on and turn-off speeds. Since high-voltage SiC MOSFET devices can effectively reduce circuit system complexity, the application advantages of high-voltage SiC MOSFET devices are highlighted. The lack of fast and accurate simulation models is one of the key problems facing the current development of high-voltage SiC MOSFET device applications. This paper provides a behavior modeling of high-voltage SiC MOSFETs considering the effect of variable temperature. The model further characterizes and fits temperature-sensitive parameters based on the characteristics of the behavior model parameters for the differences in static characteristics of high-voltage SiC MOSFETs under different temperature conditions, and the model optimizes the SiC MOSFET equivalent circuit and considers the internal parasitic parameters of SiC MOSFETs to improve the accuracy of the model fitting. In this paper, the behavior modeling of a 6.5kV/400A SiC MOSFET device developed by state grid smart grid Research Institute Co., Ltd. and verifies the validity and accuracy of the model at different temperatures by comparing the simulation data of the static model at different temperatures with the test results. Furthermore, the accuracy and convergence of the model dynamic characteristics are verified by a double-pulse test circuit and LLC resonance simulation circuit.

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