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2nd International Conference on smart grid and Energy Internet, SGEI 2022

作者： Liu, Zongye Yu, Hongyang Zhou, Ding Zhang, Xiaoyu Lu, Zhengang State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Changping Beijing China

After the bipolar short circuit fault occurs on the low-voltage DC side of the low-voltage DC distribution network with a power electronic transformer, the fault current amplitude is high and the rise speed is fast, which leads to the rapid locking of power electronic devices, and the loss of fault information of line protection. Based on the multi-branch DC distribution network with CHB-type PET, this paper proposes a fault current limiting strategy. PET starts current limiting measures after detecting the DC side fault, which can provide stable and continuous fault transient information for line protection while providing a small amount of short circuit current. On this basis, using the fault current at both ends of the line, longitudinal polarity protection without strict communication synchronization is proposed. The simulation analysis based on PSCAD/EMTDC software shows that the scheme can realize fast and reliable fault line selection and has strong resistance to transition resistance. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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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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A Multi-Level Driver for Switching Trace Regulation Method of SiC MOSFET 7

A Multi-Level Driver for Switching Trace Regulation Method o...

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

作者： Bai, Jiancheng Xu, Jingtao Guan, Zhaoliang Feng, Jingbo Xu, Hangyu Li, Xiao State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350345094

SiC MOSFET has small on-resistance, low switching losses, high switching frequency, high withstand voltage values, and excellent reverse recovery characteristics. Excessively fast switching speeds of the SiC devices can lead to severe switching overshoot, oscillations, and crosstalk. These negative effects affect the application prospects of SiC devices. In this paper, a multi-level driver(MLD) for SiC MOSFET and regulation method for switching trace are proposed, which addresses the co-optimization of multiple objectives of the switching trace. It not only ensures switching speed and low switching loss, but also effectively suppresses overshoot and oscillation. The feasibility and effectiveness of the designed multi-level driver are verified using double-pulse test. © 2023 IEEE.

关键词： Silicon carbide

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Analysis of the Suppression Effect of Series Virtual Resistors on Sub-synchronous Oscillation of New Energy 11

Analysis of the Suppression Effect of Series Virtual Resisto...

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11th International Conference on smart grid and Clean Energy Technologies, ICSGCE 2023

作者： Yu, Hongyang Liu, Zongye Zhao, Guoliang Wang, Yingpei State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350305364

The vigorous development of new energy has promoted China's energy transformation and pointed out a new direction for China's energy strategy. However, as the capacity of new energy grid connection increases, its interaction with the system strengthens, causing fundamental changes in the local system impedance characteristics and leading to phenomena such as sub-synchronous oscillation. Currently, there has been extensive research from the perspective of optimizing the characteristics of new energy units, but there is less research on changing the local system impedance characteristics from the perspective of the power grid. This article first analyzes the differences in the effect of virtual resistance on system impedance under different access modes, proposes a virtual resistance control strategy based on chain-type converter, and finally analyzes and verifies the suppression effect of virtual resistance strategy on system sub-synchronous oscillation through semi-physical closed-loop simulation of the control system. The study shows that series access mode is more suitable for changing the equivalent impedance of the local system from the network side. By adding virtual resistance at the sub-synchronous frequency, it can effectively improve damping and suppress sub-synchronous oscillations in the system. © 2023 IEEE.

关键词： chain converter HIL simulation subsynchronous oscillation virtual resistance

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of Power grid 6

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

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6th International Conference on Energy, Electrical and Power Engineering, CEEPE 2023

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

ISBN: (纸本)9798350348279

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. © 2023 IEEE.

关键词： Frequency response

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Design of Capacitive Digital Isolation chip 4

Design of Capacitive Digital Isolation Chip

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4th International Conference on Power Engineering, ICPE 2023

作者： Ke, Jinkun Ma, Weiwei Xu, Hangyu Yin, Yibo Huang, Xuequan State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350340020

Isolation refers to the physical isolation of a circuit through transformers, capacitors, and optocouplers, which can prevent DC and harmful AC currents from passing between two parts of the system, but allows for signal and power transmission. By adopting a gate capacitor scheme that can be integrated into standard CMOS processes, compared to using transformers or optocouplers as integrators and traditional discrete device isolation circuits, capacitive isolation can greatly reduce the volume occupied and facilitate miniaturization of related applications. This article proposes a capacitive digital isolator scheme, which achieves good characteristics of blocking interference transmission during digital signal transmission through OOK modulation and FSK demodulation. The specific circuit design is carried out using the Huahong BCD350GE process, which mainly includes two modules: transmitter TX and receiver, and is simulated and verified through Cadence Virtuoso. The simulation results show that the isolation chip can operate normally within the power supply range of 3.3-5V, with a temperature range of -40°C-120°C, a maximum data transmission rate of 25Mbps, a delay of 20.82ns, and a pulse width distortion of 10.11ns. Under a l5pF capacitive load and 5V power supply, the maximum power consumption is l8.91mW. © 2023 IEEE.

关键词： Demodulation

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Characteristic Harmonics Suppression Strategy for LCC-MMC Based HVDC System 20

Characteristic Harmonics Suppression Strategy for LCC-MMC Ba...

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20th International Conference on AC and DC Power Transmission 2024, ACDC 2024

作者： Shi, Yang Liu, Dong Li, Yunfeng Zhang, Jialin State Grid Corporation of China Beijing China National Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China National Key Laboratory of Power Grid Disaster Prevention and Reduction Changsha University of Science and Technology School of Electrical & Information Engineering Changsha China

ISBN: (纸本)9781837242672

This paper proposes a characteristic harmonics suppression strategy for the LCC-MMC based HVDC system using the MMC. Firstly, the topology of the LCC-MMC based HVDC system is introduced, in which the sending end converter station adopts the LCC-MMC hybrid converter valves despite of the structure of receiving end converter. Secondly, in the outer voltage loop of the MMC, high pass filters, band pass filters, and notch filters are used to extract the characteristic harmonics of the LCC converter for performance comparison, and they are reverse superimposed onto the reference current. In the inner current loop, a PIR control strategy is proposed to track and compensate for the characteristic harmonics without influence on the fundamental components. Finally, the LCC-MMC based HVDC system is constructed in MATLAB/Simulink to verify the effectiveness of the proposed characteristic harmonics suppression strategy. © The Institution of Engineering & technology 2024.

关键词： Notch filters

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Technical and economic analysis of differenct transmission schemes of faroffshore wind power

Technical and economic analysis of differenct transmission s...

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Renewable Power Generation and Future Power Systems Conference 2023, RPG 2023 UK

作者： Li, Yzhen Cheng, Tingting Lin, Zhiguang Gao, Chong Cui, Kangsheng State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd. Beijing China Tsinghua University Beijing China

ISBN: (纸本)9781839539848

Far-offshore has a wider sea area, larger wind energy reserves and higher quality wind resources, which is an important direction for the future development of wind power. However, with the increasing capacity and area of far-offshore wind farms, the technical and economic problems of far-offshore wind power transmission are becoming more prominent and there is an urgent need for an in-depth analysis of the cost of various far-offshore wind power transmission schemes. Thus, this paper compiles the typical transmission schemes of modular multilevel converter-based high voltage direct current (MMC-HVDC) transmission, low-frequency AC transmission, and full direct current collection and transmission (Full DC) for far-offshore wind power, and proposes a life-cycle cost assessment method by combining the initial investment cost, operation and maintenance cost. Typical cases are selected to construct the topologies of three transmission schemes, and the life cycle economic indexes and transmission distances of these schemes are analysed and compared. Considering a 25-year life cycle, under the case conditions of 1000MW capacity and 100km transmission distance, the total cost of the MMC-HVDC transmission scheme is the highest, followed by the low-frequency transmission scheme, and the full DC transmission scheme is the lowest, saving about 16% cost compared with the MMC-HVDC transmission scheme. © The Institution of Engineering & technology 2023.

关键词： Life cycle

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A Study of Medium Voltage Flexible Loop Closing Control Strategy Based on Sen Transformer 7

A Study of Medium Voltage Flexible Loop Closing Control Stra...

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

作者： Yuan, Peie Mu, Xiaobin Wang, Xiang Sang, Xiaokui Yuan, Yalei Dai, Fengjiao 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. State Key Labor Xiang Wang Atory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350345094

With the diversification of loads in the power system and the integration of large-scale distributed power sources, the distribution network architecture of 'closed-loop design and open-loop operation' can no longer meet users' needs for reliable power supply and flexible operation of the distribution network. The on-load voltage regulation device, as a power flow controller, can achieve flexible interconnection in the distribution network and contribute to balancing power flow, exploiting distributed power sources, and improving power supply reliability. This paper proposes a flexible interconnection technology, based on a Sen transformer, that uses thyristors and multi-winding transformers to construct a hybrid transformer to achieve multi-level fast voltage regulation. and control strategies such as low impact loop closing operation and power flow transfer are studied to ensure that the loop closing device is cost-effective, provides uninterrupted load transfer, and regulates power flow distribution, thus meeting the demand for medium voltage flexible loop closing operation. © 2023 IEEE.

关键词： Electric power distribution

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Reliable ferroelectricity down to cryogenic temperature in wakeup free Hf_(0.5)Zr_(0.5)O_(2)thin films by thermal atomic layer deposition

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Journal of Semiconductors 2024年第3期45卷 33-37页

作者： Shuyu Wu Rongrong Cao Hao Jiang Yu Li Xumeng Zhang Yang Yang Yan Wang Yingfen Wei Qi Liu State Key Laboratory of Fabrication Technologies for Integrated Circuits Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Frontier institute of Chip and System Fudan UniversityShanghai 200433China College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China University of Chinese Academy of Sciences Beijing 100049China

The performance and reliability of ferroelectric thin films at temperatures around a few Kelvin are critical for their application in *** this work,TiN/Hf_(0.5)Zr_(0.5)O_(2)/TiN capacitors that are free from the wake-up effect are investigated systematically from room temperature(300 K)to cryogenic temperature(30 K).We observe a consistent decrease in permittivity(εr)and a progressive increase in coercive electric field(Ec)as temperatures *** investigation reveals exceptional stability in the double remnant polarization(2P_(r))of our ferroelectric thin films across a wide temperature ***,at 30 K,a 2P_(r)of 36μC/cm^(2)under an applied electric field of 3.0 MV/cm is ***,we observed a reduced fatigue effect at 30 K in comparison to 300 *** stable ferroelectric properties and endurance characteristics demonstrate the feasibility of utilizing HfO_(2)based ferroelectric thin films for cryo-electronics applications.

关键词： hafnia-zirconia solid solution ferroelectricity cryogenic temperature wake-up effect

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