检索结果-内蒙古大学图书馆

4th IAHR Asian Working Group Symposium on Hydraulic Machinery and systems

作者： Cai, Jinhan Zhou, Xuejun Luo, Hongying Wang, Zhengwei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China College of Mechanical Engineering Tianjin Sino-German University of Applied Science No. 2 Yashen Road Tianjin China College of Hydraulic and Civil Engineering Tibet Agricultural and Animal Husbandry University China Department of Energy and Power Engineering Tsinghua University China

In recent years, with the continuous development of China's hydropower projects, Pelton turbines are gradually being valued, and the focus of development has shifted from plain areas to plateau areas. Environmental impacts such as high altitude, water temperature, and high sediment content in the plateau area have caused serious interference to equipment that originally worked in a stable environment, for example, the failure of the cooperation between the parts of the turbine and the mutual seizure, the increased wear of the nozzle needle, the decrease of the flow rate and the water outlet speed of the nozzle, and the decrease of the air pressure in the plateau environment lead to the change of the flow state of the nozzle. In view of the above problems, this paper puts forward the design scheme of impulse turbine test-bed, using the method of changing specific speed to determine the basic parameters of impulse turbine unit, so as to eliminate the influence of plateau environment on the normal operation of turbine, obtain the efficiency condition of model experiment under low ambient pressure, and improve the operation efficiency and reliability of turbine unit. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Nozzles

来源：评论

学校读者我要写书评

暂无评论

Optimal Aggregation Approach for Virtual power Plant Considering Network Reconfiguration

引用

Journal of Modern power systems and Clean Energy 2021年第3期9卷 495-501页

作者： Long Wang Wenchuan Wu Qiuyu Lu Yinguo Yang the Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua Shenzhen International Graduate School(Tsinghua SIGS)Tsinghua UniversityShenzhenChina the State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijingChina the Electric Power Control Center of Guangdong Power Grid Co. Ltd.China Southern Power GridGuangzhouChina

As an aggregator of distributed energy resources(DERs) such as distributed generator, energy storage, and load,the virtual power plant(VPP) enables these small DERs participating in system operation. One of the critical issues is how to aggregate DERs to form VPPs appropriately. To improve the controllability and reduce the operation cost of VPP, the complementary DERs with close electrical distances should be aggregated in the same VPP. In this paper, it is formulated as an optimal network partition model for minimizing the voltage deviation inside VPPs and the fluctuation of injection power at the point of common coupling(PCC). A new convex formulation of network reconfiguration strategy is incorporated in this approach which can guarantee the components of the same VPP connected and further improve the performance of *** proposed approach is cast as an instance of mixed-integer linear programming(MILP) and can be effectively ***, a scenario reduction method is developed to reduce the computation burden based on the k-shape algorithm. Numerical tests on the 13-bus and 70-bus distribution networks justify the effectiveness of the proposed approach.

关键词： Virtual power plant distributed energy resource network partition network reconfiguration

来源：评论

学校读者我要写书评

暂无评论

Carbon Emission Responsibility Accounting in Renewable Energy-Integrated Dc Traction power systems

SSRN

引用

SSRN 2023年

作者： Li, Zhanhe Li, Xiaoqian Lu, Chao Ma, Kechun Bao, Weihan State Key Laboratory of Power System Operation and Control Dept. of Electrical Engineering Tsinghua University Beijing100084 China Sichuan Energy Internet Research Institute Tsinghua University Sichuan Chengdu610299 China School of Electrical Engineering Xi'an Jiaotong University Shaanxi Xi’an710049 China

This study presents a practical method to determine the carbon emission responsibility (CER) in DC traction power systems (TPSs) that incorporate renewable energy sources. The increasing importance of carbon peaking and neutrality necessitates novel carbon financing policies, such as carbon taxes and cap-and-trade, for which accurate CER calculation is crucial. This study focuses on CER related to electrical energy consumption, a complex task due to the separation of energy usage and carbon dioxide emissions. To address this, the research adapts the carbon emission flow (CEF) method to suit renewable energy-integrated DC TPSs, considering the unique characteristics of rail vehicles as energy prosumers and challenges in real-time power flow tracking. The proposed rail vehicle CEF model and real-time power flow tracing approach offer practical CER accounting solutions for system planning and real-time operation. A case study based on real engineering data validates the effectiveness of these methods, demonstrating their fairness to rail transit systems and AC utilities. © 2023, The Authors. All rights reserved.

关键词： Renewable energy resources

来源：评论

学校读者我要写书评

暂无评论

RESEARCH ON THE PID PARAMETER SELF-TUNING OF THE PRESSURIZER control system OF NUCLEAR power PLANT 29

RESEARCH ON THE PID PARAMETER SELF-TUNING OF THE PRESSURIZER...

引用

2022 29th International Conference on Nuclear engineering, ICONE 2022

作者： Wang, Hongrui Xing, Kunpeng Zou, Tao Yang, Zhijia Wang, Jingyang Zhang, Pengbin State Key Laboratory of Robotics Key Laboratory of Networked Control System Institutes for Robotics and Intelligent Manufacturing Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China University of Chinese Academy of Sciences Beijing China China Nuclear Power Engineering Co. Ltd Shenzhen China College of Mechanical and Electrical Engineering Guangzhou University Guangzhou China Key Laboratory of Networked Control System Institutes for Robotics and Intelligent Manufacturing Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China

ISBN: (纸本)9780791886373

The pressurizer is an essential part of the safe operation of the nuclear power plant. It contains both the steam phase and the liquid phase, which requires simultaneous control of the pressure and water level, and the control system is strongly coupled. When using the PID control method, it is difficult to tune the parameters, and the difficulty is exacerbated when the set value fluctuates. This paper aims at the multi-input and multioutput pressurizer control system, based on the particle swarm optimization to realize the PID controller parameters self-tuning, adopting the time and absolute error integral as the fitness function to evaluate the merits of the PID parameters, and constantly iterating to update and obtain the PID parameters that better satisfy the current working conditions. For coupled pressurizer control systems, the PID parameter tuning method using particle swarm optimization algorithms can give a group of PID controller parameters that make the system operation stable despite the frequent fluctuation of the set value, and compared with the traditional PID controller parameter tuning method, this method can realize the PID parameter self-tuning, eliminating the trouble of manual tuning. Copyright © 2022 by ASME.

关键词： Nuclear power plants

来源：评论

学校读者我要写书评

暂无评论

A Common Bus Voltage Compensation Method for Microgrid Based on Voltage Drop Estimation 6

A Common Bus Voltage Compensation Method for Microgrid Based...

引用

6th International Conference on power and Renewable Energy, ICPRE 2021

作者： Miao, Fenglin Zhang, Fan Xie, Hongbin He, Jing Li, Xinning Jia, Chunjuan China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Shandong University School of Electrical Engineering Jinan250061 China

ISBN: (纸本)9781665449618

When multiple distributed renewable energy sources with the characteristics of virtual synchronous generator are paralleled in microgrid, the power distribution of the parallel inverter is unbalanced due to the mismatch of feeder impedance, and the common bus voltage drop problem. In this paper, a mathematical model of the parallel system is established to analyze the conditions of power sharing, and the virtual impedance method is used to improve the accuracy of power sharing of the inverter. However, the virtual impedance in series will increase the voltage drop of the line and cause the voltage of the common bus to deviate from the rated value, thus affecting the power quality. Therefore, based on the theoretical analysis of the voltage drop caused by the virtual impedance method, a voltage compensation method based on the voltage drop estimation for the common bus of microgrid is proposed. Finally, using MATLAB/SIMULINK software to build a distributed sources parallel system simulation model to verify the correctness of the virtual impedance to achieve power balance distribution and common bus voltage compensation methods. © 2021 IEEE.

关键词： Electric inverters

来源：评论

学校读者我要写书评

暂无评论

UHVDC Islanded operation system Ultralow-Frequency Oscillation and Its Countermeasures

IEEE Canadian Journal of Electrical and Computer Engineering

引用

IEEE Canadian Journal of electrical and Computer engineering 2021年第2期44卷 110-117页

作者： Li, Wei Gole, Aniruddha M. Kaffashan, Iman Xiao, Xiangning The Department of Electrical and Computer Engineering University of Manitoba ManitobaMBR3T 5V6 Canada The State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

There exists serious frequency instability in the UHVDC islanded operation system consisting of a large capacity UHVDC and its corresponding power source with hydraulic power generators. Ultralowfrequency oscillation (ULFO) is one of the frequency instable problems, which will happen because of the inconsistent frequency control features between UHVDC and hydraulic power generators. Through the frequency-domain analysis, there exists a frequency band with negative damping in the hydraulic turbine control system, and UHVDC is negative damping for frequency deviation with constant power control mode. There are four negative damping contributing factors as hydrowater starting time constant, hydrogenerator governor forward gain, islanded system total inertia, and UHVDC power. These four factors are analyzed in this article in the frequency domain. Based on the detailed ULFO damping analysis, effective frequency control strategies for UHVDC islanded system are proposed in this article by withdrawing a part of primary frequency control functions of generators or coordinating the frequency controls between hydraulic generator governors and UHVDC frequency limitation controller (FLC). Through the proposed frequency strategies, islanded system frequency is mainly controlled by UHVDC FLC, which can successfully suppress the ULFO. Validation simulations are performed on the RTDS platform, and the simulation results prove the proposed strategies. © 2021 IEEE.

关键词： Frequency domain analysis

来源：评论

学校读者我要写书评

暂无评论

Large Language Model-aided Edge Learning in Distribution system state Estimation

arXiv

引用

arXiv 2024年

作者： Xie, Renyou Yin, Xin Li, Chaojie Chen, Guo Liu, Nian Zhao, Bo Dong, Zhaoyang The School of Electrical Engineering and Telecommunications The University of New South Wales Sydney2052 Australia The State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources China Electric Power University Beijing China The Department of Electrical Engineering City University of Hong Kong Hong Kong

Distribution system state estimation (DSSE) plays a crucial role in the real-time monitoring, control, and operation of distribution networks. Besides intensive computational requirements, conventional DSSE methods need high-quality measurements to obtain accurate states, whereas missing values often occur due to sensor failures or communication delays. To address these challenging issues, a forecast-then-estimate framework of edge learning is proposed for DSSE, leveraging large language models (LLMs) to forecast missing measurements and provide pseudo-measurements. Firstly, natural language-based prompts and measurement sequences are integrated by the proposed LLM to learn patterns from historical data and provide accurate forecasting results. Secondly, a convolutional layer-based neural network model is introduced to improve the robustness of state estimation under missing measurement. Thirdly, to alleviate the overfitting of the deep learning-based DSSE, it is reformulated as a multi-task learning framework containing shared and task-specific layers. The uncertainty weighting algorithm is applied to find the optimal weights to balance different tasks. The numerical simulation on the Simbench case is used to demonstrate the effectiveness of the proposed forecast-then-estimate framework. Copyright © 2024, The Authors. All rights reserved.

关键词： Multi-task learning

来源：评论

学校读者我要写书评

暂无评论

Optimal Allocation of Synchronous Condensers in Renewable power Grids

Optimal Allocation of Synchronous Condensers in Renewable Po...

引用

IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Zijiao Han Guangyu Na Wenkai Dong Xiaorong Xie Qi Jia Yuze Su State Grid Liaoning Electric Power Supply Co. Ltd. Shenyang China Department of Electrical Engineering State Key Laboratory of Power System Tsinghua University Beijing China

Optimal allocation of synchronous condensers is one of the most-commonly-used ways to improve the operation performance of renewable power generators in weak grid. However, except for optimality, equity of the allocation should also be taken seriously to ensure the acceptability of the scheme. To do so, in this paper, an optimization model for the allocation of synchronous condensers considering equity is established at first. By inducing a penalty term which measures equity of the allocation, scheme with the lowest investment and the best equity can be selected. Besides, the main constraint is to ensure that short circuit ratios seen by the renewable power generators are no less than the required level. Second, since the optimal allocation of synchronous condensers is a problem of non-linear integer programming, an improved genetic algorithm is utilized for the solution of the optimization. Finally, effectiveness of the optimization model proposed is validated via study cases. The results indicate that the method proposed can ensure equity of the allocation scheme while maintaining the lowest cost.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An Advanced control Strategy for Bidirectional Isolated Three Phase AC/DC Dual-Active-Bridge Converter in Hybrid Microgrid 5

An Advanced Control Strategy for Bidirectional Isolated Thre...

引用

5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Guo, Dongxin Wang, Panbao Kong, Jiansheng Tian, Jinjie Ren, Chunguang Meng, Xiangqi Jia, Yanbing Qin, Yue Wang, Zeqi Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Department of Electrical Engineering Harbin Institute ofTechnology Harbin China Datong Power Supply Company State Grid Shanxi Electric Power Company Datong China School of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

This paper proposes an advanced control strategy consisting of current stress optimization based on triple-phase-shifting (TPS) modulation for front-end DAB converter and 33% PWM method for back-end three-phase full bridge inverter. Compared with the traditional phase shift control, the control strategy proposed for the front-end DAB converter achieves linear control and significantly reduces current stress. In addition, it reduces the DC-Link capacitance, which improves the safety of the equipment. The 33% modulation method adopted by the full bridge inverter at the back-end reduces the switching loss of semiconductor devices. The principle, derivation and realization of the proposed control strategy are described in detail. Simulation results are presented to validate the effectiveness of the proposed strategy. © 2021 IEEE

关键词： Pulse width modulation

来源：评论

学校读者我要写书评

暂无评论

Coupling between automatic generation control and automatic voltage regulator while considering generation rate constraint of two areas 2

Coupling between automatic generation control and automatic ...

引用

2nd International Conference on Advanced electrical and Energy systems, AEES 2021

作者： Elmukhtar, Omer Zhang, Jianhua Department of computer science and control engineering North China Electric Power University Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China

This paper describes the implementation of automatic generation control (AGC) and automatic voltage regulator (AVR) under generation rate constraint (GRC) and coupling between automatic generation control and automatic voltage regulator while considering generation rate constrain of two areas for improve and better performance characteristic of load frequency control (LFC) problem. our control aim has to normalize the area control error (ACE), frequency error and tie-line power error in spite of the presences of system uncertainties and external load disturbance, So that the required frequency and power interchange with adjacent structures are maintained in order to reduce the transient deviations and to provide zero steady state error in proper short time, the behavior of the planned is checked by MATLAB SIMULINK software. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Voltage regulators

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：