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Coupling Characteristics of DFIG-based WT Considering Reactive Power Control and Its Impact on Phase/Amplitude transient stability in a Rotor Speed Control Timescale

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 511-522页

作者： Wangqianyun Tang Jiabing Hu Rui Zhang Xu Chen Zhengang Yang Electric Power Research Institute China Southern Power GridGuangzhou 510080China State Key Laboratory of Advanced Electro-magnetic Engineering and Technology and School of Electrical and Electronic Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electro-magnetic Engineering and Technology and School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China China Southern Power Grid Guangzhou 510080China

The transient stability issues caused by doubly fed induction generator(DFIG)-based wind turbines(WTs)are receiving increasing attention.The q-axis reactive power control(QCtrl),as an essential part of DFIG-based WTs,has a significant impact on its transient response.In this paper,the impact of QCtrl on the phase/amplitude transient stability of a DFIGbased WT-dominated system is analyzed from the perspective of internal voltage amplitude-phase coupling characteristics.First,an amplitude/phase dynamic model of a DFIG-based WT in rotor speed control timescale(in seconds,corresponding to traditional electromechanical timescale)is developed.Then,in comparison with familiar synchronous generators(SGs),an inherently amplitude-phase characteristic of internal voltage for a DFIG-based WT is identified.Next,taking the DFIG-based WTdominated system as an example,the impact of QCtrl on system transient stability via the internal coupling paths is analyzed.A novel phase-amplitude coupling instability mechanism is found,which is different from that in a traditional SG-dominated system.Finally,the effects of different QCtrl strategies on transient stability are discussed.

关键词： Amplitude-phase response coupling characteristic reactive power control instability mechanism transient stability

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Distributed Deep Reinforcement Learning-based Approach for Fast Preventive Control Considering transient stability Constraints

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 197-208页

作者： Hongtai Zeng Yanzhen Zhou Qinglai Guo Zhongmin Cai Hongbin Sun State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Automation Science and Technology Xi’an Jiaotong UniversityXi’an 710000China

Preventive transient stability control is an effective measure for the power system to withstand high-probability severe contingencies.It is mathematically an optimal power flow problem with transient stability constraints.Due to the constraints involved for differential algebraic equations of transient stability,it is difficult and time-consuming to solve this problem.To address these issues,this paper presents a novel deep reinforcement learning(DRL)framework for preventive transient stability control of power systems.A distributed deep deterministic policy gradient is utilized to train a DRL agent that can learn its control policy through massive interactions with a grid simulator.Once properly trained,the DRL agent can instantaneously provide effective strategies to adjust the system to a safe operating position with a near-optimal operational cost.The effectiveness of the proposed method is verified through numerical experiments conducted on a New England 39-bus system and NPCC 140-bus system.

关键词： Deep reinforcement learning preventive Control transient stability

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A review on transient stability of land-sea networked fishery microgrids

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Information Processing in Agriculture 2022年第1期9卷 148-158页

作者： Yuntao Ju Zhen Gao Zhiyu Li Xi Chen Jiubao Zhen College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China

The islands and offshore fish farming platforms in the deep sea can form a land-sea net-worked fishery microgrids to realize the complementary supply of energy.The fishery microgrid contains a high proportion of renewable energy sources such as wind,solar and waves,and mixed AC and DC loads such as feed machine,energy storage,and fishery robot.Due to the harsh operating environment,the possibility of equipment damage increases,and the requirements for system stability are higher.In this paper,firstly,the definition of transient stability of land-sea networked fishery microgrids is given.Then,the key features of the fishery microgrid is introduced,and the influence of the micro-source interface type,control strategy,current limiting mechanism and load characteristics on the transient stability is expounded.The definition of power Angle of fishery microgrid and the characterization of instability system are given.Next,the research trends of tran-sient stability are sorted out,evaluated and discussed from two aspects:approaches of transient stability analysis and methods to improve transient stability.Finally,the key issues that need to be solved urgently in the research on the transient stability of the land-sea networked fishery microgrids are summarized,and the relevant research direc-tions are prospected.

关键词： Microgrid Networked fishery microgrids transient stability

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Optimal Allocation of STATCOM to Enhance transient stability Using Imperialist Competitive Algorithm

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Intelligent Automation & Soft Computing 2023年第6期36卷 3425-3446页

作者： Ayman Amer Firas MMakahleh Jafar Ababneh Hani Attar Ahmed Amin Ahmed Solyman Mehrdad Ahmadi Kamarposhti Phatiphat Thounthong Department of Energy Zarqa UniversityZarqa13133Jordan Department of Mechanical Engineering Al-Zaytoonah University of JordanAmman11733Jordan Abdul Aziz Al Ghurair School of Advanced Computing(ASAC) Luminus Technical University CollegeJordan Department of Electrical and Electronics Engineering Faculty of Engineering and ArchitecturesNisantasi UniversityIstanbulTurkey Department of Electrical Engineering Jouybar BranchIslamic Azad UniversityJouybarIran Renewable Energy Research Centre(RERC) Department of Teacher Training in Electrical EngineeringFaculty of Technical EducationKing Mongkut’s University of Technology North Bangkok1518Pracharat 1 RoadBangsueBangkok10800Thailand

With the daily expansion of global energy consumption,developing the power grids is of uttermost importance.However,building a new trans-mission line is costly and time-consuming,so utilizing the same lines with possible higher transmission capacity is very cost-effective.In this regard,to increase the capacity of the transmission lines,the flexible alternating current transmission system(FACTS)has been widely used in power grids in recent years by industrialized countries.One of the essential topics in electrical power systems is the reactive power compensation,and the FACTS plays a significant role in controlling the reactive power current in the power grid and the system voltage oscillations and stability.When a static synchronous compensator(STATCOM)is embedded in a power system to increase the bus voltage,a supplementary damping controller can be designed to enhance the system oscillation damping.Given the expansion of the grids in the power system,the complexity of their optimization and the extraordinary ability of the imperialist competitive algorithm(ICA)for solving such problems,in this paper,the ICA has been used to determine the optimal position and size of the FACTS devices.

关键词： STATCOM FACTS optimization transient stability imperialist competitive algorithm

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transient stability enhancement of DC-connected DFIG and its converter system using fault protective device

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Journal of Modern Power Systems and Clean Energy 2017年第6期5卷 887-896页

作者： Shaomin YAN Aimin ZHANG Hang ZHANG Jianhua WANG Bin CAI School of Electrical Engineering Xi’an Jiaotong UniversityXi’anChina School of Engineering Qufu Normal UniversityRizhaoChina School of Electronic and Information Engineering Xi’an Jiaotong UniversityXi’anChina

transient stability of doubly-fed induction generators(DFIGs)is a major concern in both AC and DC grids,and DFIGs must stay connected for a time during grid faults according to the power grid requirements.For this purpose,this work proposes an overcurrent and overvoltage protective device(OCV-PD)to ensure that DCbased DFIG system can stay connected and operate well during the faults.Compared with a series dynamic braking resistor(SDBR),two aspects are improved.First,a twolevel control strategy and DC inductor circuit are used to ensure that the OCV-PD can limit the current impulse to protect DFIG system during an overcurrent fault.Second,the OCV-PD can protect system from overvoltage fault which a SDBR cannot do.Simulation results verify itsvalidity and feasibility,finding that for overcurrent protection the OCV-PD outperforms a SDBR with an average decreased index of 3.29%,and for overvoltage protection it achieves an average index of 1.02%.

关键词： transient stability Doubly-fed induction generator(DFIG) Overcurrent and overvoltage protective device(OCV-PD) DC grid Series dynamic braking resistor(SDBR)

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transient stability risk assessment of power systems incorporating wind farms

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Journal of Modern Power Systems and Clean Energy 2013年第2期1卷 134-141页

作者： Lu MIAO Jiakun FANG Jinyu WEN Weihua LUO State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and TechnologyWuhan 430074China Liaoning Electric Power Company Limited Shenyang 110006China

Large-scale wind farm integration has brought several aspects of challenges to the transient stability of power systems.This paper focuses on the research of the transient stability of power systems incorporating with wind farms by utilizing risk assessment methods.The detailed model of double fed induction generator has been established.Wind penetration variation and multiple stochastic factors of power systems have been considered.The process of transient stability risk assessment based on the Monte Carlo method has been described and a comprehensive risk indicator has been proposed.An investigation has been conducted into an improved 10-generator 39-bus system with a wind farm incorporated to verify the validity and feasibility of the risk assessment method proposed.

关键词： Wind farm integration transient stability DFIG Risk indicator Wind farm location

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Virtual Transmission Solution Based on Battery Energy Storage Systems to Boost Transmission Capacity

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 466-474页

作者： Matías Agüero Jaime Peralta Eugenio Quintana Victor Velar Anton Stepanov Hossein Ashourian Jean Mahseredjian Roberto Cárdenas Coordinador Eléctrico Nacional SantiagoChile PGSTech Montreal Canada Ecole Polytechnique de Montréal Montréal Canada University of Chile Santiago Chile IEEE

The increasing penetration of variable renewable energy(VRE)generation along with the decommissioning of conventional power plants in Chile,has raised several operational challenges in the Chilean National Power Grid(NPG),including transmission congestion and VRE curtailment.To mitigate these limitations,an innovative virtual transmission solution based on battery energy storage systems(BESSs),known as grid booster(GB),has been proposed to increase the capacity of the main 500 kV corridor of the NPG.This paper analyzes the dynamic performance of the GB using a wide-area electromagnetic transient(EMT)model of the NPG.The GB project,composed of two 500 MVA BESS units at each extreme of the 500 kV corridor,allows increasing the transmission capacity for 15 min during N-1 contingencies,overcoming transmission limitations under normal operation conditions while maintaining system stability during faults.The dynamic behavior of the GB is also analyzed to control power flow as well as voltage stability.The results show that the GB is an effective solution to allow greater penetration of VRE generation while maintaining system stability in the NPG.

关键词： Battery energy storage system(BESS) grid booster transient stability voltage stability electromagnetic transient(EMT)

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A Nonlinear Coordinated Approach to Enhance the transient stability of Wind Energy-Based Power Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第4期7卷 1087-1097页

作者： Mohammad Javad Morshed the Department of Electrical and Computer Engineering University of Louisiana at LafayetteLafayetteLA 70504 USA

This paper proposes a novel framework that enables the simultaneous coordination of the controllers of doubly fed induction generators(DFIGs) and synchronous generators(SGs).The proposed coordination approach is based on the zero dynamics method aims at enhancing the transient stability of multi-machine power systems under a wide range of operating conditions. The proposed approach was implemented to the IEEE39-bus power systems. transient stability margin measured in terms of critical clearing time along with eigenvalue analysis and time domain simulations were considered in the performance assessment. The obtained results were also compared to those achieved using a conventional power system stabilizer/power oscillation(PSS/POD) technique and the interconnection and damping assignment passivity-based controller(IDA-PBC). The performance analysis confirmed the ability of the proposed approach to enhance damping and improve system’s transient stability margin under a wide range of operating conditions.

关键词： Doubly fed induction generator(DFIG) excitation controller multi-machine power system synchronous generator(SG) transient stability zero dynamics

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transient stability Analysis Based on the Sensitivity of Trajectory Length

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Wuhan University Journal of Natural Sciences 2009年第2期14卷 169-173页

作者： JIANG Ningqiang HUANG Chao CAI Weifeng School of Automation Nanjing University of Science and Technology Nanjing 210094 Jiangsu China

The length of the trajectory is proposed as a function for the employment of the sensitivity analysis method in power system transient stability analysis. Its sensitivity to the faultclearing time is about 10 times higher than that of the energy function or the distance function. The integrating time is reduced to less than 3 s while the accuracy is maintained. It can also be used to provide parameter limits. Simulations on the WSCC 4 machine system and the New England system verify the effectiveness of sensitivity of trajectory length in transient stability analysis.

关键词： power system transient stability sensitivity analysis

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Parallel computing of multi-contingency optimal power flow with transient stability constraints

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Protection and Control of Modern Power Systems 2018年第1期3卷 213-222页

作者： Yude Yang Anjun Song Hui Liu Zhijun Qin Jun Deng Junjian Qi Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi UniversityNanningChina State Grid Shaanxi Electric Power Research Institute Xi’anChina Department of Electrical and Computer Engineering University of Central FloridaOrlandoFL 32816USA

To deal with the high dimensionality and computational density of the Optimal Power Flow model with transient stability Constraints(OTS),a credible criterion to determine transient stability is proposed based on swing curves of generator rotor and the characteristics of transient stability.With this method,the swing curves of all generator rotors will be independent one another.Therefore,when a parallel computing approach based on the MATLAB parallel toolbox is used to handle multi-contingency cases,the calculation speed is improved significantly.Finally,numerical simulations on three test systems including the NE-39 system,the IEEE 300-bus system,and 703-bus systems,show the effectiveness of the proposed method in reducing the computing time of OTS calculation.

关键词： Power system transient stability Multi-contingency Optimal power flow Parallel computing

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