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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Li, Fangyuan Kou, Longze Zhou, Jiapei Hao, Jie State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of Dc Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China State Grid Shanxi Electric Power Company Electric Power Science Research Institute Shanxi China

ISBN: (纸本)9798350345094

At present, offshore wind power has become an important development direction for wind power generation. Offshore wind farms often use high-voltage direct current transmission technology with modular multi-level voltage source converters (MMC-HVdc) to transmit electricity to the grid. However, the fault response characteristics of offshore wind farms through the MMC-HVdc transmission system are different from those through AC transmission way. Therefore, it is significant that studying the fault ride through (FRT) technology of offshore wind farms through the MMC-HVdc grid connection system for practical engineering. An electromagnetic transient simulation model for an offshore wind farm composed of a direct drive permanent magnet synchronous generator (D-PMSG) connected to the grid is established through MMC-HVdc transmission technology. The mechanism and suppression strategy of overvoltage generation in the transmission network are provided during the fault clearance and recovery phase of the offshore wind farm HVdc transmission system under AC asymmetric faults. A two-stage improved control strategy for MMC-HVdc offshore converter station in response to asymmetric faults has been proposed, which is beneficial for the joint system to quickly recover from the post fault system voltage and suppress the overvoltage risk during the fault clearing phase. Finally, the proposed strategy is validated based on a domestic ± 500kV project in China, demonstrating its effectiveness. © 2023 IEEE.

关键词： Offshore wind farms

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Frequency Modulation Strategy of Wind Power Generation in Power System of High Renewable Penetration

Frequency Modulation Strategy of Wind Power Generation in Po...

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2023 International Conference on Power Energy Systems and Applications, ICoPESA 2023

作者： Chi, Chengbin Liu, Shan Liu, Qi Li, Fan State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing Key Laboratory of Dc Grid Technology and Simulation Beijing China State Grid Shanghai Municipal Electric Power Compan Shanghai China

ISBN: (纸本)9798350345605

Wind turbines generally adopt the maximum wind energy tracking control strategy, which makes them obtain the best power generation efficiency. However, this makes wind turbines unable to respond to changes in system conditions, provide inertial support for the system, and participate in the primary frequency modulation of the system, which brings challenges to the frequency safety of high-proportion new energy power systems. In order to improve the frequency stability of high-proportion new energy power system and make wind turbines participate in frequency control actively, this paper proposes a primary frequency modulation control strategy based on load reduction for doubly-fed wind turbines. According to the aerodynamic characteristics of variable pitch wind turbine, a coordinated load shedding control strategy combining variable pitch and variable speed operation was proposed to make the wind turbine have active power reserve capacity. A frequency response link is added to the power control, so that the unit can output power to realize inertia and frequency support when the system frequency fluctuates. The simulation results show that the proposed control strategy can improve the system inertia and primary frequency modulation capability in the full wind speed operating domain under the load mutation condition, and improve the frequency stability of the system after the wind turbine is connected to the grid. © 2023 IEEE.

关键词： Frequency modulation

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Control Strategy of Direct-Driven PMSM Wind Turbines Participating in Fast Frequency Response of Power grid 6

Control Strategy of Direct-Driven PMSM Wind Turbines Partici...

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6th International Conference on Energy, Electrical and Power Engineering, CEEPE 2023

作者： Yan, Heming Ji, Feng Pang, Hui Jia, Wenxuan Lin, Chang Pei, Xiangyu State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China The College of Electrical and Electronic Engineering North China Electric Power University Beijing China State Grid Smart Grid Research Institute Co. Ltd. Beijing Key Laboratory of DC Grid Technology and Simulation Beijing China

ISBN: (纸本)9798350348279

The large-scale grid connection of wind power brings challenges to the frequency stability of the power system, the system inertia decreases, the frequency regulation capability deteriorates, and the traditional wind turbine is difficult to meet the frequency regulation demand of the system. To address the problem of slow response of existing wind turbines participating in frequency regulation, this paper proposes a control method for permanent magnet direct-driven wind turbines participating in fast frequency response of the grid, based on power electronic converters equipped with electromagnetic level control speed to rapidly change the electromagnetic torque of the wind turbine rotor according to the system frequency change, increase or decrease the wind turbine speed to fully utilize the stored or released rotational inertia and achieve fast power regulation of the wind turbine. The results of the frequency step simulation of the permanent magnet direct-driven synchronous wind power system show that the fast frequency regulation response time of the control method proposed in this paper can reach the millisecond level. © 2023 IEEE.

关键词： Frequency response

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Mechanism and data based modelling method of photovoltaic energy storage and transmission system 9

Mechanism and data based modelling method of photovoltaic en...

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9th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, ISAEECE 2024

作者： Gu, Huaiguang Kou, Longze Gao, Yuqin Liu, Dong Liu, Dan Li, Linzhuo State Grid Smart Grid Research Institute Co. Ltd. Changping District Beijing102209 China State Key Laboratory of Advanced Power Transmission Technology Changping District Beijing102209 China Beijing Key Laboratory of DC Grid Technology and Simulation Changping District Beijing102209 China State Grid Hubei Electric Power Research Institute Hubei Wuhan430077 China North China Electric Power University Hebei Baoding071000 China

ISBN: (纸本)9781510683303

The power system model with power electronic equipment is usually a mechanism model, which needs to solve large-scale nonlinear differential algebraic equations. The solution process requires a large number of iterations, with a large amount of calculation. To address these issues in the mechanism model, a mechanism and data based modelling method based on artificial intelligence algorithms is proposed. This method replaces some complex mechanism models with data models, which can reduce the problem of requiring a large number of iterations for power electronic devices in the mechanism model. By controlling the sampling time, the accuracy control of the mechanism and data based model is achieved, finally, the mechanism and data based model of photovoltaic energy storage and transmission system is completed, improving the running speed. © 2024 SPIE ·

关键词： Data modeling Solar energy Modeling Photovoltaics Batteries Solar cells Electronic components

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Modeling and simulation Method of Offshore Power Delivery System with Hydrogen Production 4

Modeling and Simulation Method of Offshore Power Delivery Sy...

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4th International Conference on Electrical Engineering and Control Technologies, CEECT 2022

作者： Gu, Huaiguang Zhang, Jian Kou, Longze Zhou, Jiapei State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Beijing China

ISBN: (纸本)9781665498999

With the depletion of global fossil energy and the worsening of global environmental problems, the development and utilization of renewable clean energy has become an important direction in the world's energy technological change. Hydrogen energy, as a highly clean renewable energy, has become a research hotspot in the world. In this paper, a typical offshore energy system model is proposed. Firstly, according to the thermodynamic phenomena and electrochemical dynamic characteristics of the alkaline electrolyzer, the electromagnetic transient model of hydrogen production unit is established. Then, a grid-connected control scheme based on the direct current of the electrolyzer is proposed to connect the offshore wind farm with the hydrogen production system. Finally, a complete model is built on PSCAD and the electromagnetic transient simulation analysis is carried out. The results show that the system can provide stable and reasonable dc current to hydrogen production system through 60 mw wind farm, which verifies the correctness and effectiveness of the model. © 2022 IEEE.

关键词： Hydrogen production

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Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

Research on Simulation Modeling Method of New Distributing N...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Gu, Huaiguang Kou, Longze Zhu, Lin Gao, Yuqin Gao, Yang Xiong, Ping State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Changping Beijing102209 China State Grid Hubei Electric Power Research Institute Hongshan District Hubei Province Wuhan City430015 China

ISBN: (纸本)9798350300222

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed;Each simulation model is shown. © 2023 IEEE.

关键词： Electric power distribution

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Identifiability Analysis of Load Model Parameters by Estimating Confidential Intervals

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CSEE Journal of Power and Energy Systems 2023年第5期9卷 1666-1675页

作者： Xinran Zhang Chao Lu Ying Wang Qiantu Ruan Hongbo Ye Weihong Wang the School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China. the State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of Technology Beijing Forestry UniversityBeijing 100083China the State Grid Shanghai Electric Power Company Shanghai 200122China

The identification of load model parameters from practical measurement data has become an essential method to build load models for power system simulation,analysis and *** practical situations,the accuracy of the load model parameters identification results is impacted by data quality and measurement accuracy,which leads to the problem of *** this paper,an identifiability analysis methodology of load model parameters,by estimating the confidential intervals(CIs)of the parameters,is *** load model structure and the combined optimization and regression method to identify the parameters are first ***,the definition and analysis method of identifiability are *** CIs of the parameters are estimated through the profile likelihood method,based on which a practical identifiability index(PII)is defined to quantitatively evaluate ***,the effectiveness of the proposed analysis approach is validated by the case study results in a practical provincial power *** results show that the impact of various disturbance magnitudes,measurement errors and data length can all be reflected by the proposed ***,the proposed PII can provide guidance in data length selection in practical load model identification situations.

关键词： Confidential interval Load modeling parameter estimation practical identifiability

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Photovoltaic Multi-Peak MPPT Method with Improved Particle Swarm Algorithm 9

Photovoltaic Multi-Peak MPPT Method with Improved Particle S...

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9th Asia Conference on Power and Electrical Engineering, ACPEE 2024

作者： Ma, Zun Meng, Xian Xing, Chao Hu, Binjiang Zhu, Yihua Tu, Liang System Analysis and DC Technology Research Institute Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming China State Key Laboratory of HVDC EPRI CSG Power System Simulation and Control Technology Department Guangzhou China National Energy Power Grid Technology R&D Centre Power System Simulation and Control Technology Department Guangzhou China CSG Key Laboratory for Power System Simulation Power System Simulation and Control Technology Department Guangzhou China

ISBN: (纸本)9798350309638

An MPPT control strategy based on the combination of adaptive nonlinear mutation particle swarm optimization algorithm is proposed. The algorithm uses the tanh function to control the inertia weight, balances the ability of particles to optimize globally and locally, uses the ISRU function to control the learning factor, balances the weight relationship between individual learning and social learning, and improves the convergence speed of the algorithm. The nonlinear Cauchy mutation operation is proposed to expand the scope of optimization;Finally, the perturbation and observation method is used to track locally near the maximum power point to reduce power oscillation. The simulation validates that the photovoltaic MPPT control strategy based on the improved particle swarm algorithm can effectively get the maximum power point under shading conditions and improve the output efficiency of the PV array. © 2024 IEEE.

关键词： Maximum power point trackers

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dc FAULT RIDE-THROUGH for WIND POWER INTEGRATION VIA MMC-HVdc BASED on PRECISE CONTROL of ENERGY STORAGE CONFIGURED INSIDE WIND FARM

DC FAULT RIDE-THROUGH for WIND POWER INTEGRATION VIA MMC-HVD...

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Renewable Power Generation and Future Power Systems Conference 2023, RPG 2023 UK

作者： Sun, Yinfeng Guo, Yuhang Fan, Fulin Fan, Jiabin Li, Guoqing Wang, Zhenhao Wu, Xueguang Jilin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom State Grid Smart Grid Research Institute Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China

ISBN: (纸本)9781839539848

The modular multilevel converter-based high voltage direct current (MMC-HVdc) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to dc faults. To ensure the connection of a wind farm (WF) to the grid during dc faults, this paper proposes a coordinated control strategy for dc fault ride-Through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVdc. In the case of an instantaneous dc fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent dc fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed control strategies. © The Institution of Engineering & technology 2023.

关键词： Poles

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key technology of Hybrid Cascaded UHVdc Transmission System 18

Key Technology of Hybrid Cascaded UHVDC Transmission System

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18th International Conference on AC and dc Power Transmission, ACdc 2022

作者： Zhou, Jiapei Kou, Longze Gu, Huaiguang Zhu, Lin State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. Ltd. Beijing China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

The Baihetan-Jiangsu UHVdc transmission project is one of the backbone links of the West-East power transmission project in China. To meet the needs of the Baihetan-Jiangsu UHVdc transmission project, this paper proposes a hybrid cascaded HVdc transmission technology, in which sending-end adopts LCC and receiving-end adopts LCC-VSC in series. This technology can possess advantages of both LCC and VSC. This paper introduces the topology and key equipment of the hybrid cascaded HVdc system. Among them, the hybrid dc filter (H-dcF), the hybrid dc energy release device (H-dcERD) and fast bypass switch are innovatively utilized for the first time. Secondly, the control strategy of the system is studied, including the start-stop strategy, AC fault analysis and dc fault analysis. To verify the feasibility of the proposed hybrid cascaded HVdc transmission system, simulation tests for the system start-stop, AC fault and dc fault are carried out based on the simulation model built in PSCAD. The test results indicate that the hybrid cascaded HVdc technology has a smooth start-stop, flexible operation mode, reliable fault ride-through, and is feasible in engineering. © ACdc 2022. All rights reserved.

关键词： Transient analysis

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