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International Conference on Advanced power system Automation and Protection (APAP)

作者： Shuang LI Gangquan SI Kai QU Zeyu YANG Guoqing HE School of Electrical Engineering Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi’an China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

With the increasing proportion of renewable energy generation, the grid lost strong electrical support for renewable energy generating units, which leads to a series of new grid- connected stability problems. Therefore, it is of great significance to enhance the acceptance of PV power generation by improving the grid-connected voltage quality of PV inverters. A coordinated control strategy for PV inverters with the grid support capability was proposed in this paper, which fully utilized the voltage and frequency regulation capability of grid- connected inverters. At the same time, a real-time simulation system of PV grid-connected inverter based on FPGA simulator and eHS modeling technology was built by RT-LAB simulation platform. Finally, some relevant experiments are carried out on the simulation platform when the grid-connected voltage is disturbed. And the simulation results verified the validity of the proposed control strategy.

关键词： Inverters Voltage control Reactive power power generation Frequency control power system stability Threshold voltage

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Analysis of the Influence of Virtual Synchronous Machine on power Transmission Limit Based on Bifurcation Theory 3

Analysis of the Influence of Virtual Synchronous Machine on ...

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3rd IEEE International Conference on Circuits, systems and Devices, ICCSD 2019

作者： Ma, Yarong Yu, Yanling Ju, Yuntao Lei, Weimin Zhao, Feng Liu, Hui Sun, Dawei College of Information and Electrical Engineering China Agricultural University Beijing China State Grid Jibei Electric Power Co. Ltd. Beijing China State Grid Jibei Electric Power Research Institute North China Electric Power Research Institute Co. Ltd. Beijing China State Grid Key Laboratory for Grid-Connected Operation Technology Wind-Photovoltaic-Energy Hybrid System Beijing China

ISBN: (纸本)9781728130637

The access of wind turbines to the power grid will bring new challenges to the safe and stable operation of power systems. When the wind turbine adopts the virtual synchronous control strategy, it can match the characteristics of the traditional synchronous generator and solve the unstable operation problem caused by the lack of inertia. In this paper, the influence mechanism of virtual synchronous machine (VSM) model on voltage stability of power system is analyzed with bifurcation theory. The increase of the damping coefficient of the VSM and the reduction of the inertia time constant will be beneficial to the voltage stability, which can provide a basis for the wind power transmission limit. © 2019 IEEE.

关键词： Wind turbines

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Corrections to “Decision Support system for Adaptive Restoration control of Transmission system”

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Journal of Modern power systems and Clean Energy 2021年第5期9卷 1237-1237页

作者： Ze Li Yusheng Xue Haohao Wang Lili Hao School of Electrical Engineering Southeast University Nanjing China State Grid Electric Power Research Institute (NARI Group Corporation) Nanjing China State Key Laboratory of Smart Grid Protection and Operation Control Nanjing China School of Electrical Engineering and Control Science Nanjing Tech University Nanjing China

In [1], the complete affiliation of Yusheng Xue is as follows: Y. Xue (corresponding author) is with the School of electrical engineering, Southeast University, Nanjing, China, and he is also with state Grid Electric power Research Institute (NARI Group Corporation), Nanjing, China, and state key laboratory of Smart Grid Protection and operation control, Nanjing, China.

关键词： electrical engineering Adaptive systems control systems power systems Smart grids

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electrical resonance mitigation scheme based on damping controller for wind farm integration through VSC-HVDC system

Electrical resonance mitigation scheme based on damping cont...

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作者： Hu, Xiaobao Wang, Xiao Wu, Linlin Liu, Hui Sheng, Siqing State Grid Jibei Electric Power Co. Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Beijing China Department of Electrical and Electronic Engineering North China Electric Power University Baoding China Grid-connected Operation Technology Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Beijing China

Voltage Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) technology promotes the development and utilisation of large-scale wind power, but the power oscillation might occur due to the interaction between two control systems. In order to avoid the high cost of wind turbines transformation, an additional damping scheme on the VSC-HVDC converter for power oscillation mitigation is proposed in this article. On the basis of the additional damping control principle, the concrete transformation method of islanding control is given. Under the time domain simulation and impedance analysis, the validity of the proposed oscillation mitigation method is verified. © 2019 Institution of engineering and *** right reserved.

关键词： Damping

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Load forecasting model and day-ahead operation strategy for city-located EV quick charge stations 8

Load forecasting model and day-ahead operation strategy for ...

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8th Renewable power Generation Conference, RPG 2019

作者： Liu, Zeyu Xie, Yaxin Feng, Donghan Zhou, Yun Shi, Shanshan Fang, Chen Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Department of Electrical Engineering Shanghai Jiao Tong University 800 Dongchuan Rd. Shanghai China Electric Power Research Institute State Grid Shanghai Municipal Electric Power Company 171 Handan Rd. Shanghai China

ISBN: (纸本)9781839531255

Charging demands of electric vehicles (EVs) are sharply increasing due to the rapid development of EVs. Hence, reliable and convenient quick charge stations are required to respond to the needs of EV drivers. Due to the uncertainty of EV charging loads, load forecasting becomes vital for the operation of quick charge stations to formulate the day-ahead plan. In this paper, based on trip chain theory and EV user behaviour, an EV charging load forecasting model is established for quick charge station operators. This model is capable of forecasting the charging demand of a city-located quick charge station during the next day, where the Monte-Carlo simulation method is applied. Furthermore, based on the forecasting model, a day-ahead profit-oriented operation strategy for such stations is derived. The simulation results support the effectiveness of this forecasting model and the operation strategy. The conclusions of this paper are as follows: 1) The charging load forecasting model ensures operators to grasp the feature of the charging load of the next day. 2) The revenue of the quick charge station can be dramatically increased by applying the proposed day-head operation strategy. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Monte Carlo methods

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Study on characteristics and impacting factors of oscillation of wind farms integration via an MMC-based HVDC system

Study on characteristics and impacting factors of oscillatio...

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作者： Wang, Xiao Hu, Xiaobao Liu, Hui Lan, Haibo Sheng, Siqing Wu, Linlin State Grid Jibei Electric Power Co. Ltd. Research Institute North China Electric Power Research Institute Co. Ltd. Beijing China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory Beijing China Department of Electrical and Electronic Engineering North China Electric Power University Baoding China State Grid Jibei Electric Power Company Limited Beijing China

Modular multilevel converter (MMC)-based high-voltage DC (HVDC) transmission technology has become an ideal solution for large and remote wind farms integration. Oscillation or instability phenomena might occur due to the rapid control of power electronic converters in both wind farms and MMC-based HVDC system. In order to reveal oscillation characteristics of wind farms and MMC-based HVDC interconnected system, the system equivalent damping stability criterion is deduced theoretically, and a system damping analysis platform is built in this study. On this base, the impact on 1-1000 Hz oscillation characteristics from many factors including controller parameters of wind turbines and MMC-based HVDC, wind turbines power and wind turbines number is analysed, and mechanism of instability under different conditions is explained physically in terms of system damping characteristics. Time-domain simulations in RT-LAB are presented to validate the stability study. © 2019 Institution of engineering and *** right reserved.

关键词： Wind turbines

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LVRT Test data analysis of converter-interfaced wind turbines

LVRT Test data analysis of converter-interfaced wind turbine...

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作者： Chen, Can Liu, Hui Wu, Linlin Shen, Chen Ju, Yuntao State Grid Jibei Electric Co. Ltd. Research Institution Beijing China Grid-connected Operation Technology for Wind-Solar-Storage Hybrid System State Grid Corporation Key Laboratory China Department of Electrical Engineering Tsinghua University Beijing China College of Information and Electrical Engineering China Agricultural University Beijing China

Doubly Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) are converter-interfaced wind turbines, which have much more complex short circuit behaviour after grid voltage drops. The research on short circuit current contributions provided by the wind turbines is very important for power system planning and relay protection's setting. Here, the Low Voltage Ride Through (LVRT) test data in north China are used to study the short circuit behaviour of DFIGs and PMSGs. The characteristics of two featured quantities, fundamental frequency component and peak current, are investigated. Unlike simulation or theoretical analysis, the field test data of real wind turbines from different manufacturers help utility operators to better understand the fault characteristics of converter-interfaced wind turbines. © 2019 Institution of engineering and *** right reserved.

关键词： Wind turbines

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Nonlinear Virtual Inertia control of WTGs for Enhancing Primary Frequency Response and Suppressing Drive-Train Torsional Oscillations

arXiv

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arXiv 2020年

作者： Liu, Bi Huang, Qi Zhao, Junbo Milano, Federico Zhang, Yingchen Sichuan Provincial Key Lab of Power System Wide-area Measurement and Control University of Electronic Science and Technology of China Chengdu Sichuan611731 China Department of Electrical and Computer Engineering Mississippi State University StarkvilleMS39762 United States School of Electrical and Electronic Engineering University College Dublin Dublin Ireland National Renewable Energy Laboratory GoldenCO80401 United States

Virtual inertia controllers (VICs) for wind turbine generators (WTGs) have been recently developed to compensate the reduction of inertia in power systems. However, VICs can induce low frequency torsional oscillations of the drive train of WTGs. This paper addresses this issue and develops a new nonlinear VIC based on objective holographic feedbacks theory. This approach allows transforming the original nonlinear control into a completely controllable system of Brunovsky’s type. Simulation results under various scenarios demonstrate that the proposed method outperforms existing VICs in terms of suppression of low frequency drive-train torsional oscillations, enhancement of system frequency nadir as well as fast and smooth recovery of WTG rotor speed to the original MPP point before the disturbance. The proposed method is also able to coordinate multiple WTGs. Copyright © 2020, The Authors. All rights reserved.

关键词： Frequency response

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Study on Reliability Evaluation Technology Requirements for Large-scale Offshore Wind power

Study on Reliability Evaluation Technology Requirements for ...

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Chinese Automation Congress (CAC)

作者： Yan Li Xinshou Tian Zhankui Zhang Xiao Yu Yongning Chi Ruanming Huang Daoshan Huang Wenhui Shi Mengyao Zhang China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China Wind Power Research Center Shanghai Jiao Tong University Shanghai China School of Electrical and Electronic Engineering North China Electric Power University Beijing China Shanghai Electric Economic Research Institute State Grid Shanghai Electric Power Company Shanghai China Fujian Electric Power Research Institute State Grid Fujian Electric Power Company Fuzhou China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

It is necessary to evaluate the reliability of the system's operation after grid-connected offshore wind power, to comprehensively evaluate and further improve the reliability of the grid including the receiving end of offshore wind power, which is beneficial the receiving power grid with large-scale offshore wind power runs safely and stably. Improve the power supply reliability of the offshore wind power receiving terminal. Considering the harsh operating conditions of offshore wind power, the frequent occurrence of extremely bad weather such as typhoons on the eastern coast, and the mutual influence of certain situations are frequent and involve a wide range, which brings serious harm to the offshore wind power connect system. At the same time, offshore wind power maintenance has poor accessibility, high maintenance costs, and reduced the reliability level of offshore wind power systems. In addition, when offshore wind power is connected to the receiving power grid through a combination of high-voltage AC and DC, it will have complex interactions with multi-level AC and multi-type DC external incoming calls, which may expand the scope and depth of the fault. Therefore, it is necessary to take into account the effects of severe weather at sea, offshore wind power maintenance plans, and various complex interactions to conduct a more comprehensive and in-depth study of the reliability assessment of offshore wind power connect to the power grid.

关键词： Reliability power system reliability Wind power generation Maintenance engineering Wind farms power systems Software reliability

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Fault Ride Through Technology of Wind power Transmission system and Its Research Scheme

Fault Ride Through Technology of Wind Power Transmission Sys...

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Sustainable power and Energy Conference (iSPEC)

作者： Yan Li Xinshou Tian Yongning Chi Hongzhi Liu Linjun Wei Chao Liu Yuyan Song Lei Liu Zhongwei Xing China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China College of Electrical Engineering Sichuan University Chengdu China Dongfang Electric Wind Power Co. LTD. Dongfang Electric Corporation Deyang China Research Center Shenzhen Hopewind Electric Co. Ltd Shenzhen China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

In recent years, renewable energy represented by wind power and photovoltaic has developed rapidly in the world. China's renewable energy is the fastest-growing country in terms of wind power and photovoltaic power generation. 174 million kW, accounting for about 19% of total power capacity in China, renewable energy has become the second largest power source. In some province-level regional power grids with high renewable energy penetration rates, such as Gansu, Ningxia, Xinjiang, Hebei, and Inner Mongolia, the total installed capacity of renewable energy and power sources accounted for 41.4%, 36.5%, 32.2%, 30.1%, and 28.8%, respectively. According to the 2015 report of the National Development and Reform Commission's Energy Research Institute, “China's 2050 High Proportion of Renewable Energy Development Scenarios and Path Studies”, by 2030, the cumulative installed capacity of wind and solar power will exceed 2.05 billion kW, accounting for approximately 51% of the country's total installed power capacity. With the rapid growth of the proportion of wind power, wind power must change its role from a supplementary power source to a main power source, and actively participate in power grid operation control to achieve wind-power-friendly grid connection. In the transient process of the power grid, in order to effectively solve the problem of transient active support for large-scale wind power grid connection, it is urgent to carry out a demand analysis of wind power fault ride-through characteristics and master the key technologies of active support control in the transient process of wind power.

关键词： Renewable energy sources Process control Wind power generation power grids Wind turbines Voltage control Transient analysis

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