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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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dc-Side Synchronous Active Power Control of Two-Stage Photovoltaic Generation for Frequency Support in Islanded Microgrids

SSRN

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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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Fault ride-through control of improved voltage drop method for MMC-HVdc connected renewable energy

Fault ride-through control of improved voltage drop method f...

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

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen X. Dong Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

Renewable energy connected to the grid via MMC-HVdc should have fault ride-through (FRT) ability. However, it is difficult to achieve reliable FRT without high-speed and reliable communication between converters in the system. The coefficient of the traditional voltage drop method is qualitatively set as a linear constant, making it difficult to quickly reach the required voltage under different faults. As a result, there are long step delays due to the coordination of converters in the system, which consequently causes the dc system to operate at high voltage during FRT. To address this problem, this paper analyzes the dynamic characteristics of the dc system and the principles of the traditional voltage drop method. Based on this analysis, FRT control of improved voltage drop method for MMC-HVdc connected renewable energy is proposed. Finally, a simulation model is constructed in the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed method. Additionally, the proposed method is compared with the traditional method. The results demonstrate that the proposed method reduces the step delay and achieves accurate and reliable FRT.

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Offline parameter identification method considering the nonlinear characteristics of grid-connected inverter controller

Offline parameter identification method considering the nonl...

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

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen X. Jiang Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

The correct model parameters play important role in fault characteristics analysis and protection design. It is a necessity to identify the parameters based on external characteristics due to the problem of parameters black-box. However, existing studies lack concerns in the nonlinear control of the control system during the transient, and cannot analysis the transient characteristics of the converter. Therefore, the inverter parameter identification method based on the dynamic model of phase-locked loop (PLL) is proposed in this paper. It is revealed that the influence of the dynamic process of PLL on the identification model. Considering the dynamic characteristics of PLL, a transient current identification model is established. A parameter identification method based on structural similarity (SSIM) was proposed. simulation examples show that the proposed parameter identification method can identify parameters accurately.

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A non-unit adaptive traveling wave protection method for flexible dc transmission lines based on supplement of voltage data

A non-unit adaptive traveling wave protection method for fle...

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

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen K. Yao Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible dc transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVdc (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTdc. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios.

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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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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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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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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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Control strategy of doubly-fed induction generator during the grid voltage swell

Control strategy of doubly-fed induction generator during th...

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作者： Le, Zou Xueguang, Wu Longze, Kou Dong, Liu Fangyuan, Li Mingxiao, Han North China Electronic Power University Beijing China Global Energy Interconnection Research Institute Beijing China Beijing Key Laboratory of DC grid Technology and Simulation Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China

This study firstly derives the relationship between the grid voltage and the rotor current of doubly-fed induction generator (DFIG) during the grid voltage swell. Then, an effective control strategy aiming to restrain rotor over-current is proposed and the control strategy of the grid-side converter is also improved. The proposed rotor current suppression and grid voltage suppression method, cooperating with the dc chopper, can not only solve the problem of short circuit of the rotor side converter resulting from the frequent switching of crowbar device, but also maximally improve the capability of wind turbine in dynamic reactive power support without adding any other power electronic devices. With the help of this control strategy, the wind turbine could maintain its normal operation even during the fault and the high voltage ride through of wind turbine can be achieved. As a result, the stability of the wind power integration is significantly improved. Finally, the simulations and analysis in the power systems computer aided design (PSCAD)/electromagnetic transients including dc (EMTdc) verify the effectiveness and feasibility of the proposed control scheme. © 2019 Institution of Engineering and *** right reserved.

关键词： Wind turbines

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