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SSRN 2022年

作者： Zhong, Cheng Zhou, Yang Chen, Jikai Liu, Zhanjie Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China State Grid Shandong Weihai Electric Power Co. Ltd Weihai China State Grid Energy Research Institute Co. Ltd Beijing102209 China

Virtual synchronous generator control (VSG) is an attractive method for the grid-tied inverter to provide inertia and frequency support. However, it brings some troubles on dc-link voltage control when it is applied to two-stage photovoltaic (PV) power generation. This study proposes a dc-Side synchronous active power Control for two-stage photovoltaic (PV) power generation without energy storage. Synchronous active power Control l is applied to dc-dc converters, while the grid-tied inverter still maintains the dc-link voltage constant. The dc-dc converters flexibly regulate active power to provide the simultaneous inertial and primary frequency response like a synchronous generator. A simple sensorless iterative maximum power estimation method is introduced and integrated into the dc-side VSG strategy. The maximum available power under variable irradiance conditions can be obtained. The effectiveness and advantages of the control strategy are validated through case studies on an island microgrid that included PV generations with a dc-bus collection system. © 2022, The Authors. All rights reserved.

关键词： power control

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Impedance Modeling and Stability Analysis of a Three-phase Three-level NPC Inverter Connected to the grid

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CSEE Journal of power and Energy Systems 2020年第2期6卷 270-278页

作者： Bo Zhang Xiong Du Jingbo Zhao Jiapei Zhou Xiaoming Zou State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University) Shapingba DistrictChongqing 400044China Power System Technology Center Electric Power Research Institute of State GridJiangsu Electric Power Co.Ltd.Jiangsu 320115China HVDC Simulation Center Department of HVDC technologyGlobal Energy Interconnection Research InstituteBeijing 102209China

The interaction between grid-connected inverters and the grid may cause stability issues,and compromise the reliable operation of the *** study investigates the stability of a three-level neutral point clamped(NPC)inverter connected to the grid using impedance-based *** the impedance model of a three-phase three-level NPC inverter has not yet been reported,this study fills the literature gap by analyzing the influence of three-level dc-side neutral point control on the impedance *** fully considering the dc bus dynamics and dc voltage control loop,and the current loop and phase-locked loop(PLL),the admittance model of a three-phase three-level NPC inverter is established and verified by ***,in the stability analysis of a threelevel NPC inverter grid-connected system,the frequency coupling introduced by the PLL and dc bus dynamics is included with the help of an established admittance *** stability of the grid-connected system under different grid short circuit ratios(SCR)and operating power levels is analyzed according to the Nyquist stability *** experimental results revealed that the established impedance model of the three-phase three-level NPC inverter can properly represent the stability of this system.

关键词： grid-connected inverter neutral point control stability three-level

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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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International Conference on power System technology (powerCON)

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

ISBN: (纸本)9781665407380

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.

关键词： Damping Analytical models Resonant frequency power system stability Harmonic analysis Stability analysis Impedance

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From distributed energy resources to virtual power plants: A cyber-physical system solution for integrating demand-side in smart grid 4

From distributed energy resources to virtual power plants: A...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Tian, Liting Cheng, Lin Wan, Yuxiang Yuan, Kai Liu, Rui Wu, Kuihua Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Beijing China State Grid Economic Technology Research Institute Beijing China Institute State Grid Shandong Electric Power Company Economic Technology Research Jinan China

ISBN: (纸本)9781728196060

Distributed Energy Resources(DERs) will be an important part of the future power system under the spread of distributed renewable energy generation, electric vehicles, demand response and other technologies. Cyber-physical system (CPS) is one of the development directions for the future smart grid to integrate the widespread DERs. First, this paper presents the basic architecture and operation process of virtual power plant (VPP). Then the solution of communication structure and software platform are proposed. It is pointed out that virtual power plants have good applicability in information and communication infrastructure, power market and DER integration. Finally, a demonstration program in China is introduced. The research and application of virtual power plant is currently in its embryonic form. It provides a solution for the transmission from centralized power production to the distributed energy utilization, and is an adequate way to integrate geographical dispersion, heterogeneous DERs. © 2020 IEEE.

关键词： Virtual power Plants

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An improved voltage prediction criterion of commutation failure in HVdc

An improved voltage prediction criterion of commutation fail...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Zeng, Yuan Li, Yan Lu, Yajun Wei, Wei Zhang, Yunxiao Liu, Xinyang Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China Research Institute DC Technology Center State Power Economic Beijing China DC Technology Center State Grid Corporation of China Beijing China

ISBN: (纸本)9781728155081

Aiming at the problem of commutation failure often occurring in high voltage direct current (HVdc), the shortcoming of the existing voltage prediction criterion is analyzed based on the mechanism of commutation failure. By building the HVdc model and studying the transient process of HVdc after three-phase AC fault, a time-series segmentation method is proposed to calculate the post-fault transient dc current based on the post-fault AC voltage. Based on the method, an improved voltage prediction criterion of commutation failure simultaneously considering the dc current dynamics and the pre-fault operating state of HVdc is proposed, which can improve the accuracy of commutation failure prediction significantly. The feasibility and validity of the proposed current calculation method and improved voltage prediction criterion are verified by the comparison with the simulation results. © 2020 IEEE.

关键词： Time series

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A novel method based on dynamic extinction angle of thyristor to mitigate commutation failure for HVdc 16

A novel method based on dynamic extinction angle of thyristo...

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16th IET International Conference on AC and dc power Transmission, ACdc 2020

作者： Kou, Longze Mi, Zhiwei Huang, Xiaojing State Key Laboratory of Advanced Transmission Technology Global Energy Interconnection Research Institute Ltd. Changping District Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Ltd Changping District Beijing China School of Electrical and Electronic Engineering North China Electric Power University Changping District Beijing China

ISBN: (纸本)9781839533914

Commutation failure is one of the critical problems for the HVdc transmission system. According to the theoretical analysis, the characteristics of the dynamic minimum extinction angle of the thyristor can be obtained. Considering the effect of the system operation conditions on the minimum extinction angle of the thyristor, a dynamic compensation method is proposed, which aims to mitigate the commutation failure of the HVdc transmission system. A simulation model based on CIGRE HVdc standard test system is built in PSCAD/EMTdc. The control performance of the proposed compensation method is verified by carrying out simulations under different fault scenarios. simulation results prove that the proposed compensation method, to some extent, has the ability to mitigate the consequential commutation failure under single-phase fault and three-phase fault. Therefore, the fault recovery characteristics and the reliability of HVdc transmission system can be effectively improved. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Electric commutation

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Feasibility analysis of single-end equivalent modeling to LCC-HVdc transimission system 4

Feasibility analysis of single-end equivalent modeling to LC...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Wang, Bin Li, Zhizhong Guo, Qi Liu, Zhijiang Li, Shuyong Cui, Liu Tsinghua University Dept. of Electrical Engineering Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology RD Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728196060

The commutation failures seriously threaten the safe operation of hybrid AC/dc grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVdc single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVdc dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVdc system which does not depend on the measurement information of dc sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/dc coupling faults induced by AC side fault of LCC HVdc inverter station and participation of dc control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research. © 2020 IEEE.

关键词： Electric inverters

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Investigation on Insulating Properties of Epoxy Resin Impregnated Paper Affected by Curing Agents and Accelerator Contents

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Teng, Chenyuan Ding, Yichao Zhou, Yuanxiang Zhao, Lei Zhang, Yunxiao Chen, Haoran Zhang, Youbing Zhejiang University of Technology College of Information Engineering Hangzhou310023 China Nankai University China and College of Electronic Information and Optical Engineering Tianjin300350 China Zhejiang Testing & Inspection Institute for Mechanical and Electrical Products Quality Co. Ltd Hangzhou310051 China Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing100084 China State Grid Xinxiang Electric Power Supply Company Xinxiang453002 China

The curing formula is vital to the performance of epoxy resin impregnated paper (RIP) material. This work explored the effect of curing agents and accelerator contents on the thermal and electrical properties of RIP material. It was found that the RIP material cured with 1phr accelerator has the optimal glass transition temperature, electrical conductivity, dielectric loss and dc breakdown strength compared with RIP material cured by 0.5phr, 2phr, and 3phr accelerator. The RIP material cured with MEHHPA has better thermal and insulating properties compared with the RIP material cured with METHPA. The existence of the crepe paper amplifies the influence of accelerator and curing agent for the hydroxyl groups affect the curing process as well as the chain segment arrangement. This study provides the research support for the design of the curing formula for RIP insulation used in dc bushing. © 1994-2012 IEEE.

关键词： Dielectric losses

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Corrigendum to “Hierarchical evaluation framework for coupling effect enhancement of renewable energy and thermal power coupling generation system” [Int. J. Electr. power Energy Syst. 146 (2023) 108717]

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International Journal of Electrical power & Energy Systems 2024年 158卷

作者： Yao Zou Qianggang Wang Bo Hu Yuan Chi Guiping Zhou Fei Xu Niancheng Zhou Qinqin Xia State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University China State Grid Liaoning Electric Power Company Limited Shenyang Liaoning China State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

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Numerical Stability and Compensation Method for Equivalent Controlled Source in Electromagnetic Transient simulation

Numerical Stability and Compensation Method for Equivalent C...

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2019 IEEE PES Innovative Smart grid Technologies Asia, ISGT 2019

作者： Gao, Lu Ji, Feng Yan, Heming Lin, Chang Pang, Hui Li, Jihong State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC grid Technology and Simulation Global Energy Interconnection Research Institute Co. Ltd Beijing China State Grid Zhejiang Electric Power Co. Ltd Hangzhou China

ISBN: (纸本)9781728135205

In electromagnetic transient simulation, equivalent controlled source is usually used as an alternative of the original circuit element, such as a controlled voltage source to replace the modular multilevel converter(MMC). Since a time-step delay between the control and circuit system solution, there may be numerical stability problem. By deducing the delay differential equation and calculating its characteristic values, the causes of numerical instability are explained. Finally the numeric compensation method to solve the numerical stability problem is proposed by studying the delay function through Taylor's series and Laplace transformation. © 2019 IEEE.

关键词： Time delay

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