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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251-260 订阅

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DISCRIMINATION METHOD OF HVdc COMMUTATION FAILURE BASED ON VALVE VOLTAGE AND VALVE CURRENT

DISCRIMINATION METHOD OF HVDC COMMUTATION FAILURE BASED ON V...

引用

2021 Annual Meeting of CSEE Study Committee of HVdc and Power Electronics, HVdc 2021

作者： Fan, Zheng Zhu, Lin Wei, Xiaoguang Liu, Dong State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of Dc Grid Technology and Simulation Global Energy Interconnection Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9781839537035

Commutation failure is one of the most common faults on the inverter side of HVdc transmission system. Rapid and accurate discrimination of commutation failure is the premise of resisting commutation failure. In this paper, a method for discriminating HVdc commutation failure based on valve voltage and valve current is proposed. According to the process and development of commutation failure, combined with the two waveform information of valve voltage and valve current, the most direct information characteristics of commutation failure are extracted for discrimination. Compared with the discrimination method of single use of converter valve voltage or converter valve current, this method not only accurately discriminates the commutation failure, but also improves the discrimination speed and shortens the discrimination time. Taking CIGRE HVdc benchmark model as simulation example, the logic module of HVdc commutation failure discrimination method based on valve voltage and valve current is built in PSCAD/EMTdc to verify the effectiveness of the proposed method. © 2021 IET Conference Proceedings. All rights reserved.

关键词： Logic devices

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A Method for Power System Stability Assessment Using simulation Results

A Method for Power System Stability Assessment Using Simulat...

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

作者： Yixuan Peng Chang Lin Guying Zhuo Xiaomeng Li Dechao Xu Chenghao Li State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research Institute Beijing China Electric Power Research Institute State Grid Henan Electric Power Company Zhengzhou China

In order to automatically determine system stability using simulation results to improve research efficiency, a data-driven method for stability assessment is proposed in this paper. The main idea is to analyze the phase-plane trajectories of extracted simulation waveform envelopes. The whole framework of the proposed method along with principles of envelope extraction and phase plane analysis method is introduced in this paper. In the end, two cases and corresponding results are provided to verify the proposed method.

关键词： Analytical models simulation System integration Power system stability Stability analysis Trajectory

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Digital Isolator Based on On-Chip Transformer for High-Voltage SiC MOSFET

Digital Isolator Based on On-Chip Transformer for High-Volta...

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

作者： Jinkun Ke Jinbo Feng Chang Liu Zhaoliang Guan Hangyu Xu Ming Zhao State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China School of Integrated Circuits Huazhong University of Science and Technology WuHan China Information Communication Branch Company Shanxi Electric Power Company Taiyuan China

In high-voltage applications utilizing Silicon Carbide (SiC) MOSFETs, digital isolators play a crucial role. These isolators separate the low-voltage control side from the high-voltage power side, ensuring the safety of both the low-voltage control circuit and operators. This paper presents a digital isolator design utilizing on-chip transformer technology, specifically designed for SiC MOSFET drivers operating at a maximum switching frequency of 100kHz. The transformer consists of two adjacent square copper windings insulated with polyimide, achieving an isolation voltage of 5kV. The proposed design incorporates pulse count techniques with a refresh module, which not only effectively reduces power consumption but also prevents error generation. simulation results confirm the digital isolator's capability to achieve a maximum data rate of 40Mbps, a transmission delay of 21ns, and a static current of 150uA.

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Influence of Conductivity Parameters of EPDM on Electric Field Distribution of Insulating Interface in HVdc Cable Joints

Influence of Conductivity Parameters of EPDM on Electric Fie...

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Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Minghao Dai Wenpeng Li Qiang Xu Tianyu Yang Bo Qiao Wei Zhao Lisheng Zhong State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.LTD. Beijing China State Grid Shanghai Municipal Electric Power Company Shanghai China

ISBN: (数字)9781665467957

ISBN: (纸本)9781665467964

HVdc cable accessories are an important part of the dc cable system, and it is also the weakness of the cable lines. Due to the difference in conductivity between EPDM and XLPE, the insulating interface space charge accumulates and the field strength increases, resulting in Insulation failure. In this paper, through simulation research, the conductivity parameters of EPDM are adjusted to observe its influence on the electric field distribution at the insulation interface. Based on the simulation results, the guidance for the modification of EPDM materials is put forward.

关键词： Power cables Silicon carbide HVdc transmission simulation Power cable insulation Graphite Conductivity

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Research on Carbon Emission Calculation Model of Electromagnetic Vibration Noise Reduction Equipment in Power System

Research on Carbon Emission Calculation Model of Electromagn...

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Image Processing and Computer Applications (ICIPCA), IEEE International Conference on

作者： Chao Fan Jingkai Nie Sheng Hu Fayuan Wu Zhaofeng Guo Qiang He State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Hunan Electric Power Co. Ltd. Electric Power Research Institute Changsha China State Grid Jiangxi Electric Power Co. Ltd. Electric Power Research Institute Nanchang China Hebei Vocational University of Technology and Engineering Xingtai China North China Electric Power University Baoding China

The research area of this article is the magnetic vibration noise reduction of equipment in the power system. By establishing a mathematical model to analyze carbon emissions and calculating the model, the main purpose is to analyze the effectiveness of various primary equipment electromagnetic vibration noise reduction and related technical measures. This article takes the main electromagnetic vibration noise source power transformer in the substation as an example, establishes an active noise reduction hardware system, and then writes a main control algorithm program, Modular implementation of various unit functions. Then the indirect boundary element method is used to calculate the acoustic characteristics of the bus bridge. The comparison between the final calculation results and experimental data indicates the effectiveness of the simulation model and calculation method. Improve the structure based on simulation results. Experimental verification shows that it has good noise reduction effect

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Research on a Novel Reactive Power Emergency Control Strategy for HVdc Receiving System

Research on a Novel Reactive Power Emergency Control Strateg...

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

作者： Longze Kou Huaiguang Gu Yang Gao Tao Lin Xiyue Fu Hui Du Qingyan Li State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co.Ltd.) Beijing China School of Electrical Engineering and Automation Wuhan University Wuhan China

In the renewable power system, the renewable energy fed by the high voltage direct current transmission system (HVdc) replaces the conventional unit output near the landing point of the HVdc receiving end power grid, resulting in a relatively tense state of dynamic reactive power near the landing point of the HVdc. When induction motors are the main loads of HVdc receiving power grid, after the fault occurs in AC system, the load bus voltage may continue to decline, and the problem of voltage stability, especially the transient voltage stability, is becoming increasingly prominent. In order to recover the voltage quickly, this paper proposes a method of using HVdc converter station as emergency reactive power supply to realize the emergency control of transient voltage stability in HVdc receiving power grid by temporarily reducing dc current. Aiming at the quantitative calculation of dc current, this paper establishes a nonlinear optimization model with the objective of minimizing the energy transmission reduction of HVdc transmission, and uses the global orthogonal configuration method to convert the differential equations in the objective function and constraints into algebraic equations, so as to convert the optimization model into nonlinear programming problem, and obtain the optimal dc current control scheme, namely, reactive power emergency control strategy, which greatly reduces the difficulty of solving the optimization model. Finally, a modified IEEE-14 node benchmark is used to verify the effectiveness of the method.

关键词： Reactive power Renewable energy sources HVdc transmission Power system stability Mathematical models Stability analysis Power grids

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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...

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Sustainable Power and Energy Conference (iSPEC)

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

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 °C.

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Modeling of impedance external characteristics of dc impedance adapter and its adaptive simulation strategy

Modeling of impedance external characteristics of DC impedan...

引用

Annual Meeting of CSEE Study Committee of HVdc and Power Electronics (HVdc 2023)

作者： Y. Xu W. Zhao Y. Song P. Chen State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) Beijing People's Republic of China College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 Jiangsu Province People's Republic of China

Aiming at the interactive instability problem of dc power system, under the demand of resistive-capacitive parallel simulation, this paper firstly designs the main circuit parameters and basic control strategy of impedance adapter based on Buck-Boost converter. Secondly, in order to explain the characteristics of the impedance adapter, the impedance model of it is established. Furthermore, an adaptive simulation strategy of capacitance and resistance of impedance adapter is proposed. Finally, the accuracy of the impedance model of the impedance adapter is illustrated by comparison with impedance measurements, and the effectiveness of the impedance adapter in resonance suppression is verified based on a two-terminal dc distribution system.

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Overvoltage Suppression Strategy Based on Active Control of Current for Half-Wave Commutated Modular Multilevel Converters

Overvoltage Suppression Strategy Based on Active Control of ...

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IEEE International Conference on Power and Energy Systems (ICPES)

作者： Bao Liu Yunfei Xu Guoliang Zhao Nan Fu Chen Jia State Key Laboratory of Advanced Power Transmission Technology China Electric Power Research Institute Beijing China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350391329

ISBN: (纸本)9798350391336

Flexible low-frequency AC transmission technology combines the advantages of 50 Hz AC transmission and dc transmission, and has good application scenarios. High voltage and large capacity AC/AC converters are the core equipment of flexible low-frequency AC transmission systems. The proposal of half-wave commutated modular multilevel converters effectively reduces the number of components and improves system economy. In view of this, this paper proposes an overvoltage suppression strategy for active control of inductor current, which effectively reduces the overvoltage level during commutation. The article first introduces the sparse topology and mathematical model of the half-wave commutated modular multilevel converters. Secondly, the mechanism of overvoltage generation is analyzed. Then, overvoltage suppression strategies are proposed. Finally, a PSCAD simulation model is built to verify the effectiveness and feasibility of the proposed method through simulation.

关键词： Multilevel converters Reactive power Bridge circuits Valves Mathematical models Topology Safety Voltage control Inductors PSCAD

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Mass Heterogeneous Terminal Consensus and Management Model of Power Internet of Things Based on Blockchain

Mass Heterogeneous Terminal Consensus and Management Model o...

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2021 IEEE International Conference on Electronic technology, Communication and Information, ICETCI 2021

作者： Shang, Boxiang Zhai, Wei Wang, Jianan Liu, Wei Du, Yazhou Li, Yingzhuo State Grid Tianjin Electric Power Company Tianjin China State Grid Tianjin Information & Elecommunication Company Key Laboratory of Energy Big Data Simulation of Tianjin Enterprise Tianjin China State Grid Info & Telecom Co. Ltd. Beijing China-Power Information Technology Co.Ltd. Beijing China Artificial Intelligence Academy Tianjin University of Science and Technology Tianjin China

ISBN: (纸本)9781665432511

As the application of the Internet of things in the smart grid, the Internet of things involves a variety of professional terminal equipment, different professional terminal equipment have different understanding of power grid resources, and use different protocols in data maintenance and transmission. This reduces the efficiency of the Internet of things and increases the construction and operation costs of the whole power grid system. In this paper, electronic voting, which is relatively recognized by most enterprises and institutions, is used to solve the problems caused by the lack of consensus and unified standards in the Internet of things. Based on the blockchain technology, an electronic voting model is designed to ensure that the voting results are untampered and auditable, and intelligent contract technology is used to ensure that the function of the voting model runs according to the logic of the code and will not be artificially interfered with. It replaces some functions such as the operation of the traditional third-party trusted organization coordination system and the counting of votes. Finally, the blind signature algorithm based on elliptic curve encryption is used to protect the privacy of voters. ©2021 IEEE.

关键词： smart contract

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