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IEEE General Meeting power& Energy Society

作者： Ruipeng Lu Wenping Qin Zhilong Zhu Penghui Qin Xiaoqing Han Peng Wang Shanxi Key Laboratory of Power System Operation and Control Key Laboratory of Cleaner Intelligent Control on Coal & Electricity Ministry of Education College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

To precisely evaluate the power system’s dispersed photovoltaics(PVs) hosting capacity, a method for assessing the maximum accessible capacity of distributed PVs using measured data has been suggested. Firstly, we extract the distributed PVs and bus power curves from the measured data and establish both distributed steady-state grid-following and grid-forming PVs power models. The shapelet method is employed to correct flawed daily load data. The simulated plant growth algorithm is integrated with the K-means clustering algorithm to identify time periods with similar load characteristics. The load decomposition method is utilised to reduce load time-series data into four load categories exhibiting typical industrial, commercial, agricultural, and domestic load characteristics. An enhanced ZIP load model is developed to examine the causes of load changes from a physical perspective. Furthermore, Using the improved dichotomy method, we rapidly analyse the hosting capacity of distributed PVs while adhering to operational safety constraints. We also compare the effects of two PVs types, namely grid-following PVs and grid-forming PVs, on system stability characteristics and hosting capacity. To culminate our study, we verify the simulation through application on an actual 10kV power distribution network.

关键词： Photovoltaic systems power measurement Grid following Distributed databases Clustering algorithms power system stability Data models Steady-state Load modeling Grid forming

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Primary Frequency Regulation Strategy of PMSG-Based Wind Turbines Integrated Inertia control 6

Primary Frequency Regulation Strategy of PMSG-Based Wind Tur...

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2022 6th International Conference on electrical, Mechanical and Computer engineering, ICEMCE 2022

作者： Ren, Zhihong Zhao, Qianlin Lu, Dingwen Yang, Jianwei State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing100000 China School of Electrical Engineering Southwest Jiaotong University Chengdu610000 China

Direct-drive permanent magnet synchronous wind turbine-generator (PMSG) generally operates in maximum power point tracking (MPPT) mode. PMSG cannot provide additional active power support when the grid frequency *** gradual increase of wind power penetration leads to greater frequency regulation pressure, which brings hidden dangers to the power grid. This paper focuses on the grid connection of direct-drive PMSG, proposing a primary frequency regulation strategy integrated with inertia control. The proposed strategy controls the rotor kinetic energy to simulate inertia of synchronous units by adding the support power of the response frequency variation. It concludes with variable power tracking control and energy storage system control. Compared with the traditional strategy retains active power, this proposed strategy increases wind energy utilization. Adopting variable power tracking control combined with energy storage can overcome secondary frequency drop and reduce energy storage configuration capacity. © Published under licence by IOP Publishing Ltd.

关键词： Energy storage

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Dynamic state Estimation for Integrated Electricity-gas systems Based on Kalman Filter

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CSEE Journal of power and Energy systems 2022年第1期8卷 293-303页

作者： Yanbo Chen Yuan Yao Yuzhang Lin Xiaonan Yang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Electrical&Electronic EngineeringNorth China Electric Power University102206 BeijingChina Qinghai Key Laboratory of Efficient Utilization of Clean Energy Tus-Institute for Renewable EnergyQinghai UniversityXining 810016China School of Engineering Xining UniversityXining 810016China School of Electrical&Electronic Engineering North China Electric Power University102206 BeijingChina Department of Electrical and Computer Engineering University of MassachusettsLowellMA 01852USA State Key Laboratory of Power Grid Safety and Energy Conservation China Electric Power Research Institute100192 BeijingChina

In recent years, integrated electricity-gas systems(IEGSs) have attracted widespread attention. The unifiedscheduling and control of the IEGS depends on high-precisionoperating data. To this end, it is necessary to establish anappropriate state estimation (SE) model for IEGS to filter theraw measured data. Considering that power systems and naturalgas systems have different time scales and sampling periods, thispaper proposes a dynamic state estimation (DSE) method basedon a Kalman filter that can consider the dynamic characteristicsof natural gas pipelines. First, the standardized state transitionequations for the gas system are developed by applying the finitedifference method to the partial differential equations (PDEs) ofthe gas system;then the DSE model for IEGS is formulatedbased on a Kalman filter;also, the measurements from theelectricity system and the gas system with different samplingperiods are fused to ensure the observability of DSE by using theinterpolation method. The IEEE 39-bus electricity system and the18-nodes Belgium gas system are integrated as the test *** results verify the proposed method’s accuracy andcalculation efficiency.

关键词： Dynamic state estimation integrated electricitygas system Kalman filter two time-scale measurements transition state equation

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A Digital Twin Framework for Transient Stability Assessment Based on Knowledge Distillation

A Digital Twin Framework for Transient Stability Assessment ...

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power and electrical engineering (ACPEE), 5th Asia Conference on

作者： Junjie Cui Wenping Qin Zhilong Zhu Ruipeng Lu Penghui Qin Xianzhen Li Key Laboratory of Cleaner Intelligent Control on Coal & Electricity Ministry of Education Shanxi Key Laboratory of Power System Operation and Control College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

In the context of the digital transformation of power systems, various new sensors are capable of acquiring massive real-time data from the power grid, providing an opportunity for the development of digital twins in power systems. This paper proposes a transient stability assessment digital twin framework based on knowledge distillation. Addressing the challenges of high computational resource consumption and model deployment difficulties associated with existing high-precision complex models in transient stability assessment, the knowledge distillation method is introduced for model lightweighting. Simultaneously, the proposed continuous learning online updating strategy enables adaptive online updates for complex operating conditions and structures, enhancing the learning capability for online additions of diverse samples. Using Transformer as the transient stability assessment model, the effectiveness of the proposed approach was validated on the IEEE 39-bus system.

关键词： Training Adaptation models Computational modeling power system stability Transformers Stability analysis power grids

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A Quasi-Parallel Resonant Switched Capacitor DC-DC Converter with Wide Input Voltage Range Regulation and Enhanced Dynamic Performances

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IEEE Journal of Emerging and Selected Topics in power Electronics 2025年

作者： Qi, Jingjing Wu, Xuezhi Sun, Kai Tsinghua University State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Beijing100084 China Beijing Jiaotong University National Active Distribution Network Technology Research Center Beijing100044 China

Wide-range and high-efficiency DC-DC converters are in high demand for various applications, such as distributed systems, electric vehicles, and DC buildings. Resonant switched capacitor converters (ReSCC) can achieve soft switching, have small passive device capacity, and exhibit low voltage stress, but the voltage ratio is difficult to be regulated continuously. In this paper, a quasi-parallel resonant switched capacitor DC-DC converter is proposed to satisfy the design requirements, which incorporates a ReSCC with soft-switching and variable voltage ratio, as well as a Buck converter. In addition, a simplified optimal trajectory controller for ReSCC is investigated, which can be combined with PI controller of Buck converter to enhance the load transient of the proposed converter. Moreover, the input voltage feedforward control is implemented with the optimized feedforward coefficient to suppress the input voltage disturbance. The proposed converter can achieve high efficiency and rapid dynamic response over a wide conversion range. The correctness of the theoretical analyses is verified by a 36V∼60V-5V/20A prototype. © 2013 IEEE.

关键词： Capacitor bank

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electrical resistivity-temperature characteristics enhancement of insulating cross-linked polyethylene composites by incorporating positive temperature coefficient particles with different Curie temperatures

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High Voltage 2023年第1期8卷 1-11页

作者： Guimin Jiang Yuanxiang Zhou Chenyuan Teng Yunxiao Zhang Xin Huang Lei Xue Luming Zhou The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment Xinjiang UniversityUrumqiChina State Key Laboratory of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijingChina College of Information Engineering Zhejiang University of TechnologyHangzhouChina School of Electronics and Computer Science University of SouthamptonSouthamptonUK

Incorporating positive temperature coefficient(PTC)ceramic particles into polymers provides a prospective alternative solution for suppressing severe electric field distortions caused by negative temperature coefficient(NTC)of electrical resistivity within polymer insulation in high voltage direct current *** effect of the Curie temperature of PTC particles on the inhibition of the NTC effect of cross-linked polyethylene(XLPE)is investigated in this *** temperature coefficient particles with varied Curie temperatures are surface-modified and melt blending with *** modified particles are dispersed on averagely in the *** electrical resistivity,space charge behaviour,and direct current(DC)electrical breakdown strength of the samples are investigated at different temperatures,exploring the effect of the Curie temperature of PTC particles on suppressing the NTC effect of *** is demonstrated that the reduction in Curie temperature can further suppress the NTC effect of XLPE,enhance the DC strength at elevated temperatures,and inhibit the internal space charge *** reduction in the Curie temperatures means that the initiation of the PTC effect advances,exhibiting a higher potential barrier and inhibiting the NTC effect more *** work may give a reference for improving the temperature stability of DC properties for XLPE cable insulation.

关键词： coefficient resistivity insulation

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Research on a Refined Evaluation Method of New Distribution Network Carrying Capacity Considering Reliability and Economy

Research on a Refined Evaluation Method of New Distribution ...

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power Science and Technology (ICPST), IEEE International Conference on

作者： Wanming Zhang Minghui Bai Fei Xu Hongjia Miao Yong Zhou Chengde Power Supply Company State Grid Jibei Electric Power Co.Ltd Chengde China Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350349030

ISBN: (纸本)9798350349047

With the large-scale access of distributed power supply to the distribution network, the excessively high penetration rate of photovoltaic(PV) units will seriously affect the normal operation of the distribution network. At present, it is urgent to evaluate the capacity of distributed PV that can be accessed by the distribution network. Therefore, this paper proposes a new refined evaluation method for the carrying capacity of the distribution network considering reliability and economy. Firstly, we establish a multilevel evaluation system and model of carrying capacity, use the affiliation function to process the multi-objective function and merge it into a single-objective function, and then transform the evaluation indexes into comprehensive scores by the combination assignment method, and then transform the carrying capacity model into a second-order conical planning model for solving. Finally, the IEEE33 node distribution network is used as an example for simulation and analysis. By comparing the comprehensive scores under different scenarios, the differences in the carrying capacity of the system under different operating conditions can be intuitively derived, which proves the validity and feasibility of the algorithm and evaluation index system proposed in this paper.

关键词： Photovoltaic systems Analytical models power supplies Distribution networks Transforms Probabilistic logic Planning

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KPI-based Real-time Situational Awareness for power systems with a High Proportion of Renewable Energy Sources

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CSEE Journal of power and Energy systems 2022年第4期8卷 1060-1073页

作者： Tianhan Zhang Shengyuan Liu Weiqiang Qiu Zhenzhi Lin Lingzhi Zhu Zhao Dawei Minhui Qian LI Yang College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Renewable Energy Research Center China Electric Power Research Institute(State Key Laboratory of Operation and Control of Renewable Energy&Storage SystemsJiangsu Engineering Technology Research Center for Energy Storage Conversion and Application)Nanjing 210003China

With the increasing complexity of power systems and the widespread penetration of renewable energy sources(RES),real-time situational awareness for power systems is of great significance for operational *** the impact of RES on power system operations,a situational awareness key performance index(KPI)system for power systems with a high proportion of RES is proposed in this paper,which consists of reserve capacity abundance,ramp resource abundance,center of inertia(COI)frequency deviation,interface power flow margin,synthesized voltage stability,and angle stability ***,the KPIs are synthesized and visualized by the decision tree method and radar chart method,respectively,for monitoring the operation states(i.e,normal,alert,and emergency states)of power systems with a high proportion of *** simulations are conducted in a revised New England 16-machine 68-bus power system and an actual CEPRI-RE power system in the northwest region of China with a high proportion of *** results show that the proposed KPI-based situational awareness method is able to accurately monitor the real-time state of power systems with a high proportion of RES,and can assist power dispatchers to make effective decisions.

关键词： High proportion of renewable energy sources(RES) key performance index(KPI) situational awareness state visualization

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Practical Realization of Optimal Auxiliary Frequency control Strategy of Wind Turbine Generator

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Journal of Modern power systems and Clean Energy 2022年第3期10卷 617-626页

作者： Ming Sun Yong Min Xuejun Xiong Lei Chen Le Zhao Yuyao Feng Bingran Wang IEEE State Key Laboratory of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Shanghai Electric Power Research Institute Shanghai 200437China School of New Energy Harbin Institute of Technology(Weihai)Weihai 264209China

Adding the auxiliary frequency control function to the wind turbine generator(WTG)is a solution to the frequency security problem of the power system caused by the replacement of the synchronous generator(SG)by the *** auxiliary frequency control using rotor kinetic energy is an economical scheme because the WTG still runs at the maximum power point during normal *** this paper,the functional optimization model of the auxiliary frequency control strategy of WTG is *** optimal auxiliary frequency control strategy is obtained by solving the model *** for the practical realization of the control strategy,the coordination of the auxiliary frequency control with the maximum power point tracking(MPPT)control is *** practical auxiliary frequency control strategy is modified to adapt to different power disturbances in the system,and the parameter setting method is also *** sensitivity of system frequency to control parameters is ***,the simulation results verify the effectiveness and practicability of the proposed control strategy.

关键词： power system frequency security wind turbine generator auxiliary frequency control rotor kinetic energy energy constraint

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Predictive control Strategy of power Electronic Traction Transformer for Fault Tolerance Condition 5

Predictive Control Strategy of Power Electronic Traction Tra...

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5th IEEE International electrical and Energy Conference, CIEEC 2022

作者： Zhao, Nan Zheng, Zedong Li, Yongdong Tsinghua University State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Beijing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In this paper, a predictive control strategy of power electronic traction transformer for fault tolerance condition is proposed to ensure the safe operation of the system after fault. The working principle and the fault-tolerant method for H-bridge and dual active bridge are introduced first as the basis. Then the predictive control strategy is illustrated. Based on the analysis, the predictive control combined strategy fault-tolerant method is proposed, which can effectively solve the problem of power distribution between the fault-tolerant module and the normal working module, maintain the voltage balancing and ensure the stable operation of the power electronic traction transformer. The experiment results are given to show the efficiency and correctness of the proposed strategy. © 2022 IEEE.

关键词： power electronics

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