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SSRN 2024年

作者： Wang, Yibo Zhang, Xinyi Liu, Chuang Cai, Guowei Liu, Yu Liu, Kaipu Wang, Yuan Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Northeast Electric Power University Jilin132012 China

Traditional distribution transformers have shortcomings such as poor dynamic characteristics and unreasonable voltage compensation. It is difficult for them to meet the demand for power quality with large-scale integration of new energy into the grid. A hybrid distribution transformer (HDT) is one of the important means to address the above issues. It has good flexibility in voltage regulation and huge development potential. To analyze the operating status and losses of HDT, this paper constructs a simplified equivalent impedance model for HDT. Firstly, the operating principle, characteristics, and voltage regulation range of the direct AC/AC HDT are analyzed. Secondly, based on the state space averaging method, obtain the HDT single-phase average circuit topology and construct an HDT relaxed two-port network model. Thirdly, considering the operating losses of the transformer, derive the Thevenin equivalent parameters of HDT. Then, a simplified equivalent impedance model for HDT and the corresponding control strategies are given. Finally, verify the correctness and rationality of the proposed theory by building an HDT simulation model. © 2024, The Authors. All rights reserved.

关键词： Equivalent circuits

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Day-ahead Optimal Dispatch Model for Coupled system Considering Ladder-type Ramping Rate and Flexible Spinning Reserve of Thermal power Units

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Journal of modern power systems and Clean energy 2022年第6期10卷 1482-1493页

作者： Longjie Yang Niancheng Zhou Guiping Zhou Yuan Chi Ning Chen Lei Wang Qianggang Wang Dongfeng Chang State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqing 400044China State Grid Liaoning Electric Power Company Limited Shenyang 110006China State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems(China Electric Power Research Institute) Nanjing 210003China Xi’an Thermal Power Research Institute Company Limited Xi’an 710054China IEEE

In northern China,thermal power units(TPUs)are important in improving the penetration level of renewable *** such areas,the potentials of coordinated dispatch of renewable energy sources(RESs)and TPUs can be better realized,if RESs and TPUs connected to the power grid at the same point of common coupling(PCC)are dispatched as a coupled ***,the definition of the coupled system is introduced,followed by an analysis on its ***,based on the operation characteristics of deep peak regulation(DPR)of TPUs in the coupled system,the constraint of the ladder-type ramping rate applicable for day-ahead dispatch is proposed,and the corresponding flexible spinning reserve constraint is further ***,considering these constraints and peak regulation ancillary services,a day-ahead optimal dispatch model of the coupled system is ***,the operational characteristics and advantages of the coupled system are analyzed in several case studies based on a real-world power grid in Liaoning province,*** numerical results show that the coupled system can further improve the economic benefits of RESs and TPUs under the existing policies.

关键词： Coupled system ladder-type ramping rate flexible spinning reserve day-ahead optimal dispatch deep peak regulation peak regulation ancillary services

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Coordinated Suppression Method of Fault Current for Dc Grid with a Novel Dissipative Resistors Topology

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SSRN 2022年

作者： Jiang, Shouqi Zhao, Huanyu Li, Guoqing Xin, Yechun Wang, Lixin Wang, Weiru The Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University China

DC grid based on half-bridge modular multilevel converters (HB-MMC) is a feasible means to realize the friendly grid connection of renewable energy. To solve the problems such as high cost and technical difficulty of DC circuit breaker (DCCB), a coordinated control method for fault current suppression of DC grid connecting wind power is proposed. The key influencing factors of DC fault current are revealed by fault characteristics analysis, and an adaptive current-limiting control method for MMC is proposed, whose parameter selection principles are designed to ensure the safe operation of equipment while achieving effective suppression of fault current. In addition, a novel configuration method of dissipative resistors with the current-limiting function is proposed, which can solve the problem of surplus power in DC grid and reduce the current stress of converter valves. Based on this, a coordination scheme of dissipative resistors, the adaptive current-limiting control method, and DCCBs is proposed to block fault current, which can effectively reduce the manufacturing difficulty and cost of DCCB. Finally, a four-terminal DC grid simulation model is built based on the RTLAB OP5600 real-time digital simulation platform, and the effectiveness and feasibility of the proposed methods are verified. © 2022, The Authors. All rights reserved.

关键词： Resistors

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Topology Optimization for Harmonic Excitation Structures with Minimum Length Scale control Using the Discrete Variable Method

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 1941-1964页

作者： Hongliang Liu Peijin Wang Yuan Liang Kai Long Dixiong Yang Key Laboratory of Liaoning Province for Composite Structural Analysis of Aerocraft and Simulation College of Aerospace EngineeringShenyang Aerospace UniversityShenyang110136China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian116023China State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China

Continuumtopology optimization considering the vibration response is of great value in the engineering structure *** aimof this studyis toaddress the topological designoptimizationof harmonic excitationstructureswith minimumlength scale control to facilitate *** topology design based on discrete variables is proposed to avoid localized vibration modes,gray regions and fuzzy boundaries in harmonic excitation topology *** topological design model and sensitivity formulation are *** requirement of minimum size control is transformed into a geometric constraint using the discrete ***,thin bars,small holes,and sharp corners,which are not conducive to the manufacturing process,can be eliminated from the design *** present optimization design can efficiently achieve a 0–1 topology configuration with a significantly improved resonance frequency in a wide range of excitation ***,the optimal solution for harmonic excitation topology optimization is not necessarily symmetric when the load and support are symmetric,which is a distinct difference fromthe static optimization ***,one-half of the design domain cannot be selected according to the load and support *** examples are presented to demonstrate the effectiveness of the discrete variable design for excitation frequency topology optimization,and to improve the design manufacturability.

关键词： Discrete variable topology optimization harmonic excitation minimumlength scale control geometric constraint manufacturability

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Influence Analysis of Thermal States on Dynamic Frequency Response for power systems with High renewables

Influence Analysis of Thermal States on Dynamic Frequency Re...

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2020 IEEE Sustainable power and energy Conference, iSPEC 2020

作者： Cao, Yongji Zhang, Hengxu Li, Changgang Sun, Leshu Li, Chen Qin, Hao Guo, Qi Zhu, Yihua Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology RD Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9781728191645

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model. © 2020 IEEE.

关键词： Frequency response

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Pitch control Strategy of Permanent Magnet Synchronous Wind Turbine Generator in Response to Cluster Auto Generation control Command

Pitch Control Strategy of Permanent Magnet Synchronous Wind ...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Cui, Yang Zeng, Peng Cui, Cheng-Wei Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Ministry of Education North-east Electric Power University Jilin132012 China Neimenggu Power Supply Company Sunite Youqi Power Supply Branch of Xilin Gol Electric Power Bureau INNER MONGOLIA POWER GROUP CO LTD Xilinguole China

ISBN: (纸本)9781728135205

With the development of auto generation control (AGC) technology at home and abroad and the popularization of permanent magnet synchronous wind turbine generator(PMSG), more regions use AGC technology to dispatch power to wind farms. In view of the current problem of permanent magnet wind turbines responding to AGC commands, this paper proposes wind power control strategy for different operating conditions of the unit: For the maximum power output required by AGC, the maximum power tracking control and the pitch control strategy based on the rated speed are adopted according to the current speed;when the AGC requires the output to be reduced, the power difference based on the current speed is used. Pitch control and pitch control strategy based on rated speed. Compared with the traditional control strategy, the pitch control strategy based on the power difference can reduce the control time and suppress the fluctuation range of the active power in the control process. Finally, based on PSCAD, the simulation model of permanent magnet direct drive wind turbine is built and the response of AGC command is simulated under different working conditions, and the effectiveness of the proposed strategy is verified. © 2019 IEEE.

关键词： Wind Turbine Generators

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Bald Eagle Search Algorithm for Parameter Identification of Proton Exchange Membrane Fuel Cell

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FRONTIERS IN energy RESEARCH 2022年 10卷

作者： Yang, Bo Li, Danyang Zeng, Chunyuan Han, Yiming Li, Junhui Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming China

A precise and reliable proton exchange membrane fuel cell (PEMFC) parameter identification performs an essential function in simulation analysis, optimal control, and performance research of actual PEMFC systems. Unfortunately, achieving an accurate, efficient, and stable parameter identification can sometimes be problematic for traditional optimization methods, owing to its strong coupling, inherent nonlinear, and multi-variable characteristics. Therefore, an advanced bald eagle search (BES) algorithm is designed to dependably identify the unknown parameters of the electrochemical PEMFC model in this work. For evaluating and analyzing the overall optimization performance of the BES comprehensively, it is compared with the genetic algorithm (GA) based on MATLAB under three cases. According to the simulation results, the optimum root mean square error (RMSE) achieved by BES is 96.27% less than that achieved by GA in parameter identification, which fully indicates that the precision, accuracy, and stability of the optimization results can be remarkably improved via the application of BES.

关键词： proton exchange membrane fuel cell parameter identification bald eagle search algorithm metaheuristic algorithm MATLAB

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Analytical Analysis on DC Capacitance Voltage Dip Amplitude of AC Adjustable-Speed Drives

Analytical Analysis on DC Capacitance Voltage Dip Amplitude ...

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International Conference on Harmonics and Quality of power

作者： Zheng Yang Hou-He Chen Yu-Xi Song Guang-Ze Li Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (数字)9798350382563

ISBN: (纸本)9798350382570

With the development of society, the frequency of Adjustable-Speed Drives (ASD) usage among industrial users has surged. ASDs are highly sensitive to voltage dips, when the DC capacitance voltage drops below a certain threshold, the ASD low voltage protection is triggered. However, this threshold is set based on voltage tolerance curve (VTC) and is subjective, quantitative analysis on the amplitude of DC capacitor voltage dips in ASDs is lacking. Therefore, this paper constructs a dynamic model of the ASD grid-connected system on a transient time scale and obtains an approximate analytical solution for the power absorbed by the ASD from the grid. Furthermore, by establishing a dynamic model of the capacitor voltage during speed regulation and grid voltage dips caused by the single line-to-ground fault, and based on the Fourier expansion method, the approximate analytical solution for the amplitude of ASD capacitor voltage dips is obtained. Finally, the effectiveness of the algorithm is validated by simulation and calculation.

关键词： Analytical models Voltage fluctuations Statistical analysis Capacitance-voltage characteristics Capacitors Variable speed drives Threshold voltage Regulation Voltage control Transient analysis

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Unbalanced Strategy of Vehicle-to-Grid on Evolution Game

Unbalanced Strategy of Vehicle-to-Grid on Evolution Game

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Annual Conference of Industrial Electronics Society

作者： Xinling Li Yuzhi Zhou Libin Tian Hongwei Li Wei Zhang Hongpeng Liu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

The utilization of vehicle-to-grid (V2G) technology is an environmentally friendly approach to achieve the transition towards low-carbon energy systems. However, it is still unknown what impact the V2G policy will have on the charging market of electric vehicles (EVs) and whether it is competitive with other electricity sales strategies. Aiming at the above problems, the electricity price model of EVs in electricity market including V2G strategy is established. Firstly, a 2–3 unbalanced strategy evolutionary game (2–3 USEG) model integrating vehicle-network interaction is proposed. The asymptotically stable equilibrium points of asymmetric evolutionary games for two groups with unbalanced game strategies are obtained. Multiple game strategies between the power grid enterprises (PGE) and New power supply entities (NPSE) are studied Besides, the corresponding asymptotic stability conditions are given by the Lyapunov stability criterion. Finally, the simulation proves that the ample implemented V2G strategy not only has strong competitiveness, but also enables the charging electricity price market of electric vehicles to have the “virtual high” electricity price adjustment ability.

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Optimal Scheduling Strategy of Source-Load-Storage Based onWind power Absorption Benefit

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energy Engineering 2024年第7期121卷 1823-1846页

作者： Jie Ma Pengcheng Yue Haozheng Yu Yuqing Zhang Youwen Zhang Cuiping Li Junhui Li Wenwen Qin Yong Guo State Grid Henan Economic Research Institute Zhengzhou450000China Zaozhuang Power Supply Company State Grid Shandong Electric Power CompanyZaozhuang277000China Key Laboratory of Modern Power SystemSimulation and Control&Renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China

In recent years,the proportion of installed wind power in the three north regions where wind power bases are concentrated is increasing,but the peak regulation capacity of the power grid in the three north regions of China is limited,resulting in insufficient local wind power consumption ***,this paper proposes a two-layer optimal scheduling strategy based on wind power consumption benefits to improve the power grid’s wind power consumption *** objective of the uppermodel is tominimize the peak-valley difference of the systemload,which ismainly to optimize the system load by using the demand response resources,and to reduce the peak-valley difference of the system load to improve the peak load regulation capacity of the *** lower scheduling model is aimed at maximizing the system operation benefit,and the scheduling model is selected based on the rolling *** load-side schedulingmodel needs to reallocate the absorbed wind power according to the response speed,absorption benefit,and curtailment penalty cost of the two DR dispatching ***,the measured data of a power grid are simulated by MATLAB,and the results show that:the proposed strategy can improve the power grid’s wind power consumption capacity and get a large wind power consumption benefit.

关键词： Wind power consumption two-layer optimal demand response rolling scheduling wind curtailment penalty

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