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A NOVEL CONTROL METHOD BASED ON THE INSTANTANEOUS THYRISTOR VOLTAGE TO MITIGATE COMMUTATION FAILURE IN HVdc SYSTEMS 10

A NOVEL CONTROL METHOD BASED ON THE INSTANTANEOUS THYRISTOR ...

引用

10th Renewable Power Generation Conference, RPG 2021

作者： Zheng, Lin Zhang, Jianan Liu, Jin Wang, Huafeng Lin, Zhiguang Song, Linwei Liu, Panpan 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 Beijing China

ISBN: (纸本)9781839536069

Commutation failure is a typical fault that occurs in the inverter valves of the HVdc transmission system. Continuous commutation failure will lead to serious results to the power system especially in multi-infeed HVdc power transmission system. In this paper, a novel control method to mitigate commutation failure in HVdc systems due to voltage dips caused by AC system faults is proposed. This detection method is based on instantaneous values of the thyristor voltage and it is realized by Thyristor Triggering and Monitoring (TTM) device and valve base electronics (VBE), which makes the control system react quickly and detect commutation failure with high-precision. After detecting the commutation failure, the firing angle at the inverter station is reduced by a certain angle to extend the commutation margin. The proposed commutation failure mitigation method is tested in various fault simulation using the PSCAD/EMTdc software. A single-infeed HVdc transmission system is created to test the method's effectiveness and a two-infeed HVdc transmission system is developed to study the method's performance in the multi-infeed HVdc transmission system. The test results demonstrate that the proposed method is highly effective in mitigating the continuous commutation failure in both the single-infeed and multi-infeed HVdc transmission system. © The Institution of Engineering and technology.

关键词： Thyristors

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The Influence of ISI and an Improved Algorithm of Channel Estimation in the Chirp System 2

The Influence of ISI and an Improved Algorithm of Channel Es...

引用

2020 2nd International Conference on Electronics and Communication, Network and Computer technology, ECNCT 2020

作者： Zhao, Nan Zhao, Dongyan Wang, Yubo Tang, Xiaoke Zhao, Xu Zhang, Yubing Liu, Jiadi State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing100086 China

Chirp signal is widely used in communication, radar, sonar and ultrasonic systems. The impulse response of channel must be estimated in PSK chirp spread spectrum modulation systems which is a chirp signal multiplied by the PSK modulated signal. Due to the influence of filters and multipath channel, the received signal of current symbol will be affected by the interference of the previous symbol and the next symbol, the interference which is called inter-symbol interference (ISI) can degrade the performance of channel estimation and demodulation. In this paper, based on BPSK chirp spread spectrum modulation system, we describe the received model, the channel estimation based on FFT and channel estimation of matched filtering, analyze the impacts of ISI on channel estimation. And we simulate the MSE of channel estimation and the simulation results are consistent with the analysis, then an improved method of channel estimation is proposed based on the analysis of the impact of ISI on channel estimation. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Channel estimation

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Research on the reactive power and voltage characteristics of flexible low- frequency transmission systems for offshore wind power

Research on the reactive power and voltage characteristics o...

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12th International Conference on Renewable Power Generation (RPG 2023)

作者： J. Shang Z. Lu L. Xie G. Zhao Q. Lei State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) Beijing 102209 People's Republic of China State Key Laboratory of New Energy Power Systems North China Electric Power University Beijing 102206 People's Republic of China

Low-frequency transmission technology has been considered to be suitable for medium and long distance offshore wind power integration. However, frequency changes alter the characteristics of the offshore wind power transmission system, and the reactive power and voltage relationship of the offshore wind power low-frequency transmission system is not yet clear. In this paper, the nodal voltage method is used to analyse the system steady state power flow calculation, establish a mathematical model of the reactive power and voltage of the offshore wind power low-frequency transmission system under different output conditions of the wind farm, and analyse the static reactive power and voltage characteristics of the ***, based on the PSCAD/EMTdc simulation platform, the accuracy of the mathematical model is verified by using a 500kV/800MW offshore wind farm low-frequency transmission system as an arithmetic example.

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A-CS: Adaptive Compressive Data Gathering for Chain-type Wireless Sensor Networks 4

A-CS: Adaptive Compressive Data Gathering for Chain-type Wir...

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2022 4th International Conference on Electronic Engineering and Informatics, EEI 2022

作者： Jia, Qiang Zhang, Yiyi Guo, Peng Zhang, Kui Liu, Jiang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing China Huazhong University of Science and Technology Wuhan China Pentair Group Netherlands Shenzhen Miaoyan Technology Co. Ltd. Shenzhen China

ISBN: (纸本)9783800759231

Compressive Sensing has been validated as an efficient way for data gathering in chain-type wireless sensor networks (WSNs). Given the sparsity of the sensor nodes’ raw data, each sensor node just needs to send a constant size of data during the multi-hop data gathering, instead of relaying increasing size of data as in traditional data gathering works. However, we notice that the sparsity of raw data in event-involved local region may not be the same as that in the other usual region, which gives us hint that existing compressive sensing based on uniform sparsity of data actually can be improved. In this paper, we propose an adaptive compressive data gathering method A-CS for chain-type wireless sensor networks. Meanwhile, we design an ultra-lightweight localized sparsity variation detection mechanism for determining the event-involved region. Numerous simulation has been conducted, showing the efficiency of the proposed A-CS method. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Compressed sensing

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Research on Physical Model and simulation of 4.5kV Si IGBT Device Based on Gradient Field Ring Terminal

Research on Physical Model and Simulation of 4.5kV Si IGBT D...

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Semiconductor and Electronic technology (ISSET), International Symposium on

作者： Feng He Ruifen Nie Guohua Zhou Rui Jin Beijing Institute of Smart Energy Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Zhejiang Electric Power Co. Ltd. Hangzhou Xiaoshan District Power Supply Company Hangzhou China

ISBN: (数字)9798350390285

ISBN: (纸本)9798350390292

IGBT (Insulate Gate Bipolar Transistor) combines the high frequency and low on-state voltage characteristics of field-effect transistor and bipolar transistor, and is widely used in power electronics system. Due to the continuous expansion of the power market and the increasing application requirements, the importance of the research on the optimization of the physical model and design parameters of high voltage IGBT is still lacking. In this work, a 4.5kV Si-based IGBT structure based on a gradient field ring terminal structure is designed. On the basis of the physical mechanism for the device, the influence of relevant key structural parameters on the performance of the device, such as channel length, p-well doping level, gate oxide quality, etc., is further systematically analyzed. At the same time, the voltage performance of the device under the influence of temperature is also studied, and the corresponding optimization strategy is proposed.

关键词： Performance evaluation Insulated gate bipolar transistors Resistance Doping Voltage Logic gates Power electronics Transistors Optimization Consumer electronics

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Harmonic Stability Analysis and Damping Strategy for dc system of MMC-HVdc Across Wide Frequency Range

Harmonic Stability Analysis and Damping Strategy for DC syst...

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2021 International Conference on Power System technology, POWERCON 2021

作者： Kou, Longze Peng, Yixuan Ji, Ke Zhu, Lin Ji, Feng Liu, Dong Global Energy Interconnection Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China Global Energy Interconnection Research Institute Co. Ltd Beijing Key Laboratory of DC Grid Technology Simulation Beijing China

ISBN: (纸本)9781665407373

The harmonic resonance and instability problems become prominent in recent years with the development and application of modular multilevel converter (MMC) based HVdc system. The impedance model of MMC can be used to facilitate the analysis of harmonic stability and the design of mitigation method. In this paper, the accurate dc impedance model of MMC is firstly derived based on harmonic state space (HSS) method. The internal dynamics and control actions (control loop delay included) of MMC are considered in the derivation process. With consideration of impedance characteristics of dc transmission lines, the harmonic stability for the dc system of MMC-HVdc are theoretically analyzed across a wide frequency range and the possible harmonic resonance problems are revealed. On this basis, a modified dc damping control is proposed to mitigate the harmonic resonances and improve the harmonic stability at all possible frequency points. At last, the proposed model and control method are validated by simulation results. © 2021 IEEE.

关键词： Damping

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Energy Release Device for Solving Power Surplus Problem in LCC-VSC Hybrid Cascade Multi-terminal Transmission Project

Energy Release Device for Solving Power Surplus Problem in L...

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Electronics and Electrical Engineering technology (EEET), International Conference on

作者： Xiao Kun Liu Shan Jiang Zhe Gao Yan State Grid Corporation of China Beijing China State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd) Beijing China C-EPRI Electric Power Engineering Co. Ltd. Beijing China

LCC-VSC hybrid cascaded multi terminal HVdc transmission system has significant advantages in reducing multi-infeed dc commutation failure and improving multi terminal power supply reliability. However, the hybrid cascaded dc system has a significant problem: when the receiver system fails, the surplus power of the hybrid dc system will lead to overvoltage and overcurrent of the receiver VSC. Aiming at the power surplus problem of LCC-VSC hybrid cascaded multi terminal HVdc transmission system, this paper proposes a scheme of installing controllable arrester at the receiving end as the energy release device, and analyzes the characteristics of the energy release device under various fault conditions of the hybrid dc system, which is verified through PSCAD/EMTdc simulation.

关键词： Electrical engineering Arresters Analytical models Power supplies HVdc transmission Receivers Hybrid power systems

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Comparative Analysis on Thermal Performance and Reliability of Discrete SiC MOSFET in Press-Pack Package and Wire-Bonded Package

Comparative Analysis on Thermal Performance and Reliability ...

引用

Power Electronics and Application Symposium (PEAS), IEEE International

作者： Zheyan Zhu Ran Yao Hui Li Wei Lai Zhongyuan Chen Jinyuan Li Yaosheng Li Miaorui Wang State Key Laboratory of Power Transmission Equipment Technology Chong Qing 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

The existing discrete SiC MOSFETs still use traditional soldering packaging technology for Si devices. However, SiC material has a higher coefficient of thermal expansion, which means that the solder layer of SiC MOSFETs bears greater thermal stress, making it more prone to aging and failure at the same current level. In this paper, a press-pack (PP) method for optimizing the thermal performance and reliability of discrete SiC MOSFETs is proposed. Firstly, a PP package for discrete SiC MOSFET is raised. Secondly, the thermal performance of the same SiC MOSFET chip in the designed PP structure and commonly used TO-247-3 structure is compared based on COMSOL Multiphysics simulation. Finally, the power cycle test platform for discrete SiC MOSFETs is built and the reliability of the designed PP structure is verified. The research results show that the PP structure has the advantage of optimizing the thermal performance and reliability of the discrete SiC MOSFETs.

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Analysis and simulation of Minimums of Short Circuit Ratio for Phase-Locked Loop Based Synchronization Stability of Parallel Connected Voltage Source Converters

Analysis and Simulation of Minimums of Short Circuit Ratio f...

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smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Chaobo Dai Xiaoge Liu Zhanfeng Deng Huazhong Sun Juanjuan Wang Fengshuo Li State Key Laboratory of Advanced Power Transmission Technology (State Grid Smart Grid Research Institute Co. Ltd.) Beijing China Weifang Power Supply Company State Grid Shandong Electric Power Company Weifang China

It is a practical problem worth investigating that what minimums of the short circuit ratio (SCR) are when voltage source converters (VSC) can maintain their synchronization under given large disturbances without any short-circuit fault in grids. An overview of the synchronization stability is summarized through steady-state analysis. For a given disturbance, the minimum SCR can be provided through time domain simulation based on quasi-state large signal (QSLS) models, an equivalent current source model and a switching model, respectively. The results from steady state analysis and time domain simulation are consistent and their corresponding error is reasonable. The minimum SCR resulted from steady state analysis can be regarded as the limit of minimum SCR. The QSLS model with current transients can be used to estimate practical minimum SCR with which VSC can maintain their synchronization under agreed disturbances.

关键词： Analytical models Power system stability Stability analysis Steady-state Circuit stability Synchronization Transient analysis

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The research of the control and protection adaptability for the controllable line commutated converter

The research of the control and protection adaptability for ...

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20th International Conference on AC and dc Power Transmission 2024 (ACdc 2024)

作者： Congqi Yin Ying Xu Ming Li Fangjie Wu Jun Yang Jing Zhang Hong Liu Peiqian Guo State Grid Economic and Technological Research Institute Co. Ltd. Changping Beijing People's Republic of China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Changping District Beijing People's Republic of China C-EPRI Electric Power Engineering Co. Ltd Changping District Beijing People's Republic of China State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Haidian District Beijing People's Republic of China

ISBN: (数字)9781837241552

The high capacity and long-distance transmission ability are the major advantages of the high voltage dc transmission system using Line Commutated Converter, which makes it one of the major transmission approaches in our country. However, the single-time or consecutive commutation failures during the AC system fault are the main drawbacks of the HVdc transmission using LCC valve, severely affecting the normal operation and power transmission. In this case, a new type of controllable line commutated converter (CLCC), which is embedded with the power electronics IGBT forcing commutation, is applied to avoid the commutation failure, therefore preventing the disturbance caused by the commutation failure like the traditional HVdc transmission system using LCC valve. This paper proposes the adaptive control and protection approaches according to the operation characteristics of the CLCC, and the optimizing approaches are also provided to improve the performance of the HVdc transmission system. This article provides reference for the world’s first HVdc transmission system using CLCC.

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